JP2002107001A - Air conditioner - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a highly reliable air conditioner that makes a room a comfortable temperature and humidity state in response to a sensible heat load and a latent heat load in a room. SOLUTION: A first indoor heat exchanger functioning as a compressor, an outdoor heat exchanger, a first throttle adjusting mechanism, a condenser, a second indoor heat exchanger,
A second indoor heat exchanger functioning as a throttle adjusting mechanism and an evaporator is sequentially connected by piping, and in an air conditioner that reheats and dehumidifies indoor air, the control means controls the temperature of the first indoor heat exchanger. Controlling the opening degree of the first throttle adjusting mechanism based on the above, and adjusting the amount of heating of the room air passing through the first indoor heat exchanger.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly, to an air conditioner that makes room temperature and humidity comfortable.

[0002]

2. Description of the Related Art In a conventional air conditioner, as shown in FIG. 11, a compressor 1, a four-way switching valve, an outdoor heat exchanger 2,
A first throttle adjustment mechanism 3, a first indoor heat exchanger 4, a main circuit having an electromagnetic valve, and a second indoor heat exchanger 6 are sequentially connected by piping, and are parallel to the main circuit having the electromagnetic valve. Second
The throttle control device 5 is connected by a pipe to form a refrigeration cycle. During the cooling operation of the refrigeration cycle, the solenoid valve is opened so that the refrigerant flows through the main circuit without passing through the second throttle adjustment mechanism 5. The first indoor heat exchanger 4 and the second indoor heat exchanger 6 function as an evaporator to perform cooling.

In the dehumidifying operation for mainly reducing the indoor relative humidity, the first throttle adjusting mechanism is fully opened to close the solenoid valve of the main circuit, and the first indoor heat exchanger 4 is used as a condenser (heater).
The second indoor heat exchanger 6 functions as an evaporator, and the refrigerant is throttled by the second throttle adjusting mechanism 5, and the refrigerant is overheated by one first indoor heat exchanger 4 while the other is cooled. The passing air is cooled by the second indoor heat exchanger 6 of
The dehumidification operation mainly using sensible heat is performed without lowering the room temperature by mixing the cooled air and the heated air.

However, in the case where the first throttle adjusting mechanism is fully opened and the second throttle adjusting mechanism 5 throttles the refrigerant to perform the dehumidifying operation, the operation depends on the room temperature (sensible heat load). As the frequency of the compressor is increased, refrigerant noise is generated from the second throttle adjusting mechanism 5 at a certain frequency or higher due to the relationship of the refrigerant flow rate. Therefore, the frequency of the compressor is increased to a predetermined frequency at which no refrigerant noise is generated. Thereafter, the number of rotations of the outdoor fan 8 was increased to cope with high relative humidity in the room. That is,
Since the high-pressure is increased by increasing the rotation speed of the outdoor fan 8 and the operation is performed with a high compression ratio, the discharge temperature of the compressor is increased and power consumption is increased.

[0005] As shown in FIG. 12, the frequency of the compressor 1 and the outdoor temperature are controlled by increasing the rotation speed of the outdoor fan 8 while maintaining the frequency of the compressor 1 constant. When the rotation speed of the fan 8 is determined, the sensible heat capacity and the latent heat capacity are respectively determined, and control is performed so that the room temperature and humidity correspond to the determined sensible heat capacity and latent heat capacity, respectively.

Therefore, when the latent heat capacity is determined in order to bring the indoor humidity to a certain target set humidity, the indoor temperature is controlled by the sensible heat capacity corresponding to the determined latent heat capacity, and conversely, the indoor temperature is set to a certain target set temperature. If the sensible heat capacity is determined, the room humidity is controlled by the latent heat capacity corresponding to the determined sensible heat capacity, so that it is difficult to set the indoor temperature and humidity to the target temperature and humidity.

In other words, when the sensible heat capacity or latent heat capacity of the air conditioner at that time is equal to the indoor latent heat load or indoor sensible heat load, the indoor temperature and humidity can be set to the target set temperature and humidity. When one of the temperature and the humidity reaches the target value, the other value does not reach the target value, but merely maintains the indoor state at a value balanced with the ability of the other.

Therefore, when the room temperature is high but the room temperature is at the appropriate target set temperature, the number of revolutions of the outdoor fan 8 is reduced to reduce the room humidity. (1) Since the amount of heating is increased by increasing the temperature of the indoor heat exchanger, the indoor temperature is increased, so the rotational speed of the compressor must be increased. As a result, the amount of heating is further increased by the increase in the rotational speed. It is necessary to increase the number of revolutions of the outdoor fan 8 again by the amount of the heating up. In such a case, the number of revolutions of the compressor and the number of revolutions of the outdoor fan 8 must be predicted and controlled. Not only are difficult controls imposed, but also accuracy is low and latent heat capacity is not taken into account, so the latent heat capacity cannot be balanced against the latent heat load. , Cost electric power was also larger.

Further, in the case where the frequency of the compressor is not fixed and the refrigerant sound of the second throttle adjusting mechanism 5 is masked by the blowing sound of the indoor fan 7 by increasing the rotation speed of the indoor fan 7, In the case where the frequency of the compressor and the wind speed of the indoor fan 7 are increased, as shown in FIG. Although the temperature increased, the latent heat capacity contributing to the decrease in the absolute humidity in the room hardly increased, and as a result, the operation was performed with the dehumidification performance reduced, so that the room humidity could not be set to the target set humidity.

In the reheating and dehumidifying operation of these conventional air conditioners, since the second throttle adjusting mechanism 5 has a fixed opening for economic reasons, the second indoor heat exchanger (evaporator) is used. The so-called suction superheat (degree of superheat), which is the temperature difference between the outlet refrigerant temperature and the suction refrigerant temperature of the compressor, changes when the frequency of the compressor changes.

Therefore, such a thing is, for example, the second
The amount of throttle of the second throttle adjusting mechanism 5, that is, the degree of superheat is adjusted to a low frequency band so that the refrigerant liquid does not return to the compressor while ensuring the heat exchange capacity of the indoor heat exchanger (evaporator) 6. Even after setting, the frequency of the compressor is increased from the relationship of the indoor load, and when the amount of circulating refrigerant is increased, the throttle is excessively throttled and the outlet refrigerant temperature of the second indoor heat exchanger becomes overheated, The temperature of each part of the compressor increased, and the compressor was damaged.

Conversely, when the throttle amount (degree of superheat) of the second throttle adjusting mechanism 5 is set to a high frequency band, the frequency of the compressor is reduced due to the relationship between the indoor load and the refrigerant circulation amount is reduced. However, the liquid refrigerant tends to open, and the liquid refrigerant returns to the compressor 1. Therefore, the compressor may be damaged or the dehumidification performance may be reduced.

Further, the second in these reheating and dehumidifying operations.
Since the opening area of the throttle adjusting mechanism 5 is generally smaller than the opening area of the first throttle adjusting mechanism 3, impurities and the like are easily clogged, and the impurities and the like are actually clogged, the refrigerant circulation is reduced, and Since the reheat dehumidifying operation is continued even if the degree of superheat of the suction refrigerant increases, various troubles of the compressor caused by the clogging operation have also occurred.

Another conventional example is disclosed in Japanese Unexamined Patent Application Publication No.
137711. But,
In the cooling operation, the capacity of the compressor is controlled according to the indoor temperature (sensible heat load) for the purpose of lowering the indoor temperature during the cooling operation, and the compressor is controlled according to the indoor humidity during the dehumidifying operation. Therefore, the method of controlling the compression function force during the cooling operation and the dehumidifying operation is different, and the control is complicated.

[0015]

The conventional air conditioner is
With the configuration described above, it is difficult to set the room temperature and the relative humidity to the target temperature and humidity.

Further, in a system in which the fan speed in the room is increased during the dehumidifying operation to mask the refrigerant sound of the second throttle adjusting mechanism 5, the sensible heat ratio increases due to the increase in the wind speed, and the room temperature decreases. However, there is a problem that the dehumidifying performance is reduced.

Further, even if impurities and the like are clogged in the second throttle adjusting mechanism and the degree of superheat increases, the dehumidifying cooling operation is continued, so that there is a problem that a trouble of the compressor occurs.

The present invention has been made in order to solve the above-mentioned problem, and even if various load conditions at the time of cooling and heating change, the indoor temperature and humidity are quickly set to the target temperature and humidity to make the room comfortable. The purpose is to obtain a highly reliable air conditioner.

Further, the present invention provides a user-friendly air conditioner that automatically performs a cooling operation or a reheat dehumidification operation based on a temperature difference between a room temperature and a target temperature to make the room comfortable. The purpose is to obtain.

It is another object of the present invention to provide a highly reliable air conditioner which can prevent troubles in each device and comfortably in a room.

[0021]

In the air conditioner of the present invention, a compressor, an outdoor heat exchanger, a first throttle adjusting mechanism,
A first indoor heat exchanger that functions as a condenser, a second throttle adjusting mechanism, and a second indoor heat exchanger that functions as an evaporator are sequentially connected by piping, and in an air conditioner that reheats and dehumidifies indoor air. Controlling the opening degree of the first throttle adjusting mechanism based on the temperature of the first indoor heat exchanger,
The ratio between the sensible heat capacity and the latent heat capacity of the air conditioner is adjusted while adjusting the amount of heating of the indoor air passing through the first indoor heat exchanger. It is to fit almost.

The control means may control the first indoor heat exchanger so that the temperature of the first indoor heat exchanger becomes equal to or higher than the temperature of the indoor air when the temperature of the indoor air is equal to or lower than a target set temperature.
The opening degree of the aperture adjustment mechanism is controlled.

[0023] The control means may control the first indoor heat exchanger so that the temperature of the first indoor heat exchanger becomes lower than the temperature of the indoor air when the temperature of the indoor air is higher than a target set temperature.
The opening degree of the aperture adjustment mechanism is controlled.

Also, a compressor, an outdoor heat exchanger, a first throttle adjusting mechanism, a first indoor heat exchanger, a second throttle adjusting mechanism,
A main circuit having an on-off valve connected to the second indoor heat exchanger in sequence and connected in parallel with the second throttle adjusting mechanism, and allowing the refrigerant to flow through the main circuit. Thus, in the air conditioner that cools the room and reheats and dehumidifies the room by flowing a refrigerant through the second throttle adjusting mechanism, the control unit may control a temperature difference between the room temperature and a target set temperature. And switching the cooling operation to the reheat dehumidification operation when the room temperature reaches the target set temperature.

Further, when the rotational speed of the compressor at the target set temperature is equal to or higher than a predetermined rotational speed, the control means determines that it is not necessary to lower the relative humidity of the room air, and resumes from the cooling operation. It does not switch to thermal dehumidification operation.

When the reheating dehumidifying operation is performed, the control means determines the opening degree of the first throttle adjusting mechanism based on a difference between a relative humidity of the room air and a target humidity of the room. The speed ratio of the air conditioner is controlled to adjust the capacity ratio between the evaporation capacity and the condensation capacity of the air conditioner.

The control means corrects the temperature difference between the room temperature and the target set temperature based on the humidity difference between the relative humidity of the room air and the target set humidity, and based on the correction result, the compression The number of revolutions of the machine is controlled so that the indoor humidity becomes the target set humidity.

Further, the control means controls the number of revolutions of a fan of the outdoor heat exchanger in accordance with a change in the indoor temperature and humidity with respect to a target temperature and humidity in the indoor, so as to reduce a sensible heat load in the indoor. The ratio of the latent heat load to the ratio of the sensible heat capacity to the latent heat capacity of the air conditioner is set to be approximately equal to that of the air conditioner.

When the control means switches from the cooling operation to the reheating dehumidification operation or from the reheating dehumidification operation to the cooling operation, the operation of the compressor is stopped for a predetermined time, and the first or second compressor is stopped. The difference between the inlet and outlet refrigerant pressures of the throttle adjusting mechanism is substantially equal.

The clogging detecting means is provided at the entrance and exit of the second throttle adjustment mechanism, and detects a clogging state from a characteristic value corresponding to the temperature or pressure of the refrigerant at the entrance and exit of the second throttle adjustment mechanism. is there.

When the control means receives a clogging signal of the second throttle adjusting mechanism from the clogging detection means, refrigerant flows from the first indoor heat exchanger to the second indoor heat exchanger. The on-off valve of the main circuit is opened so as to flow.

Further, a porous body is arranged in series on the inlet side or the outlet side of the second throttle adjusting mechanism, and is configured to reduce a refrigerant noise flowing from the first indoor heat exchanger to the second indoor heat exchanger. It is intended to be absorbed.

Further, the refrigerating machine oil of the compressor is an immiscible oil that does not mix with the refrigerant.

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a schematic configuration diagram of an air conditioner according to Embodiment 1 of the present invention, in which 1 is a compressor, 2 is an outdoor heat exchanger,
Reference numeral 3 denotes a first throttle adjusting mechanism such as an electric expansion valve, 4 denotes a first indoor heat exchanger, 5 denotes a second throttle adjusting mechanism including a fixed opening orifice, a capillary, and an electric expansion valve; Is a second indoor heat exchanger, 7 is an indoor blower, and 8 is an outdoor blower. Note that the second throttle adjusting mechanism 5 provided between the first indoor heat exchanger and the second indoor heat exchanger in FIG.
It has a porous body that silences the refrigerant noise passing therethrough, and has an electromagnetic valve 6 that opens in cooling operation and closes in dehumidification operation in parallel with the second throttle adjustment mechanism 5. It has a main circuit.

Further, in FIG. 11, reference numeral 11 denotes an indoor humidity detecting means which is provided indoors and detects the relative humidity in the room, 12 denotes a room temperature sensor which is provided indoors and detects the temperature of the indoor, 13
Is a first inlet temperature sensor that is provided in the first indoor heat exchanger 4 and detects an inlet temperature of the heat exchanger, and 14 is provided in the second indoor heat exchanger 4 and is an inlet of the heat exchanger. A second inlet temperature sensor for detecting temperature, 15 is an outside air temperature sensor, 16 is a remote control light receiving unit (not shown) provided on the outer surface of the indoor unit and receiving a signal from a remote controller 17, and 17 is a target in the room. It is a remote controller for instructing operation modes such as temperature / humidity, cooling / heating, and reheating / dehumidifying operation.

Reference numeral 9 in this figure is provided in the indoor unit, and controls each device (for example, the indoor fan 7, the second aperture adjustment mechanism 5, etc.) in the indoor unit based on signals from the sensors. And an indoor microcomputer that communicates with the outdoor microcomputer 10. The indoor microcomputer 10 is provided in the outdoor unit, communicates with the outdoor microcomputer 10, and controls each device (for example, the compressor 1) in the outdoor unit based on signals from the sensors. And the number of revolutions of the outdoor fan 8, the opening degree of the first throttle adjusting mechanism 3, and the like. The control means (not shown) includes the outdoor microcomputer 10, the indoor microcomputer 9, and the like. You.

Next, the operation thus configured will be described. First, in the reheat dehumidifying operation for lowering the dehumidification of the indoor air, the control means closes the solenoid valve of the main circuit, and the refrigerant flows from the first indoor heat exchanger through the second throttle adjusting mechanism 5 to the second indoor heat exchanger. While flowing to the indoor heat exchanger,
The degree of opening of the first throttle adjusting mechanism 3 is adjusted so that the indoor heat exchanger of the second embodiment functions as a condenser, and the (evaporation) temperature of the second indoor heat exchanger 6 functioning as an evaporator is adjusted to the indoor temperature. The dew point temperature of the air is kept below the dew point, and the air passing through the room is cooled and dehumidified.

At this time, if the evaporation temperature is lowered too much to increase the cooling and dehumidification, the temperature of the room air also drops, and the room temperature may fall below the target set temperature.
In order to dehumidify the room temperature without lowering the room temperature, a part of the passing indoor air is heated by the first indoor heat exchanger 4 functioning as a condenser, and the rest of the passing indoor air functions as an evaporator. After passing through the indoor heat exchanger 6 for cooling, and then mixing these passing indoor airs to a suitable temperature and humidity,
Blow out from the outlet into the room.

In this dehumidifying cooling operation, the indoor heat exchanger is divided into the first and second indoor heat exchangers 4 and 6 as described above, and in particular, only the second indoor heat exchanger is provided. It becomes an evaporator, and the cooling capacity of the evaporator is reduced to about half, and the heat radiation capacity of the condenser is increased.

Therefore, for example, in a system in which the indoor load and the device capacity are balanced by controlling the inverter (the number of revolutions of the compressor), the compressor and the outdoor unit at the end of the cooling operation when the indoor temperature reaches the target set temperature are used. When the mode is switched to the dehumidifying cooling operation at the rotation speed of the fan, as described above, the first indoor heat exchanger 4 functions as a condenser, so that the heat release amount (condensing capacity) of the condenser of the refrigeration cycle increases, and The compressor is heated by the first indoor heat exchanger 4 and the heat exchange capacity of the evaporator decreases, and the indoor temperature rises. Increase the number of revolutions further than the number of revolutions, and apply the necessary heating amount to the target set humidity while maintaining the room at the target set temperature with this increased capacity to make the indoor air a comfortable target temperature and humidity. It will be.

Further, the device capacity is larger than the indoor load,
In the so-called thermo-operation control in which control is performed within a predetermined temperature range of the indoor target set temperature, it is necessary to reduce the number of revolutions of the outdoor fan in accordance with a change in the capacity of the condenser (change in outside air temperature) in order to secure a heat radiation amount. However, since the capacity of the device is larger than the indoor load, the room temperature does not rise even when the compressor is operated at the rotation speed at the end of the cooling operation, so that the rotation speed does not need to be increased.

However, in any case, the temperature of the indoor air
In order to make the humidity a comfortable target temperature / humidity, the condensing temperature (heating temperature) of the first indoor heat exchanger 4 functioning as a heating means is adjusted by the opening degree of the first throttle adjusting mechanism 3, and By this adjustment, the temperature (cooling temperature) and the cooling capacity of the second indoor heat exchanger 6 functioning as an evaporator via the second throttle adjusting mechanism 5 having a fixed opening are also adjusted, and the heating amount and the cooling amount are adjusted. Adjust the indoor air to a comfortable target temperature
It will be humidity.

Therefore, at this time, for example, as shown in FIG. 5, the opening degree of the first throttle adjusting mechanism 3 is reduced, and the refrigeration cycle at the time of the reduction is denoted by A. Refrigeration cycle when adjusting mechanism 3 is further narrowed
Then, the refrigeration cycle B having the larger throttle amount has the first indoor heat exchanger 4 than the refrigeration cycle A having the smaller throttle amount.
As the amount of refrigerant supplied to the heater decreases, the heating temperature at that time also decreases and approaches room temperature, so the heat exchange capacity is greatly reduced and the heating power is greatly reduced. Increase. When the reverse operation is performed, on the contrary, the ratio of the cooling capacity to the heating capacity decreases. Therefore, the opening degree of the first throttle adjustment mechanism 3 is increased or decreased, as shown in FIG. In addition, the ratio between the heating capacity (sensible heat) and the cooling capacity (sensible heat + latent heat), that is, the ratio between the sensible heat capacity and the latent heat capacity is adjusted to match the indoor sensible heat load and the latent heat load, and the indoor air To a comfortable target temperature and humidity.

In other words, the condensing temperature of the first indoor heat exchanger 4 is reduced to the room temperature or less to reduce the heating amount to zero, or the first indoor heat exchanger 4 is heated to the room temperature or higher by squeezing the first restrictor adjusting mechanism 3. Set indoor air to a comfortable target temperature and humidity. In addition,
When the heating amount is set to be equal to or lower than the room temperature and the heating amount is set to zero, the gradient between the latent heat and the sensible heat, which is the ratio between the room temperature and the humidity, is a function of only the evaporation temperature, as shown in FIG.
By adjusting the opening of the air conditioner and the evaporation temperature, the ratio between the latent heat capacity and the sensible heat capacity of the air conditioner can be controlled without heating with extra energy.

Next, taking the above into consideration, for example, when the room temperature is higher than the target set temperature (for example, 28 ° C. with respect to the target set temperature of 25 ° C.) and the relative humidity is high (80% or higher),
As shown in FIG. 2, the first throttle adjustment mechanism 3 is set so that the condensation temperature of the first indoor heat exchanger 4 is equal to or lower than room temperature, that is, so that the heating amount is almost zero and cooling is mainly performed. , The evaporating temperature of the second indoor heat exchanger 6 is changed from A to B, and the gradient (SHF) of the target temperature / humidity with respect to the room temperature / humidity is changed from A to B as shown in FIG. To make the target temperature and humidity above the SHF (sensible heat ratio line), and combine the equipment capacity with the indoor load to make the room a comfortable target temperature and humidity.

In the case where the heating amount is set to zero, the evaporating temperature is reduced, the temperature difference from room temperature is increased, and the heat exchanger capacity is increased, because the first throttle adjusting mechanism 3 is throttled. Since the amount of circulating refrigerant is greatly reduced, and the cooling capacity is reduced, the absolute humidity in the room mainly decreases without significantly lowering the room temperature, so that the relative humidity in the room decreases.

During this control, if the outside air temperature rises or the room temperature rises due to a heating object in the room (such as the number of people in the room), the rotation speed of the outdoor fan is increased to increase the high pressure (heating state). The target temperature / humidity is adjusted to SHF (sensible heat ratio line) by preventing the temperature from changing, responding to the load by increasing the rotation speed of the compressor, or adjusting the opening degree of the first throttle adjusting mechanism 3. ) Control to get on.

The room temperature is almost the target set temperature (25 ° C.).
When the relative humidity is high (80% or more), the opening degree of the first throttle adjusting mechanism 3 is controlled and the heating amount is adjusted so that the temperature of the first indoor heat exchanger 4 becomes equal to or higher than room temperature. Keep the room humidity at the target set humidity while maintaining the room temperature.

That is, when the indoor temperature is almost the target set temperature and the humidity is high, as shown in FIG. 5, the condensation temperature of the first indoor heat exchanger 4 is reduced to room temperature because the humidity is reduced mainly by the heating power. In order to lower the indoor humidity by adjusting the opening degree of the first throttle adjusting mechanism 3 so as to be slightly higher than the above, the room temperature is increased by the heating power while slightly heating the first indoor heat exchanger 4. The heating power is canceled by the sensible heat capacity of the cooling capacity of the second indoor heat exchanger 6, so that the indoor temperature is prevented from lowering and the relative humidity is reduced, so that the indoor can be set at a comfortable target temperature. Bring to humidity.

In order to cancel the heating power with the sensible heat cooling capacity of the cooling capacity of the second indoor heat exchanger 6, the heat exchange capacity (capacity) of the first and second indoor heat exchangers is almost the same. Then, the temperature difference between the room temperature and the temperature of the first indoor heat exchanger 4 may be substantially equal to the temperature difference between the room temperature and the temperature of the second indoor heat exchanger 6. That is, processing may be performed considering the temperature difference ratio based on the capacity ratio between the first and second indoor heat exchangers.

The room temperature is set to the target set temperature (25 degrees).
For example, when the temperature is 23 ° C., in other words, when the room absolute humidity where the user does not feel much heat and humidity is low, the opening of the first aperture adjustment mechanism 3 is almost fully opened as shown in FIG. 3, the change in the air side is prevented by preventing the temperature of the second indoor heat exchanger 6 from lowering the room temperature, and the heating amount is increased as shown in FIG. (15 ° C.), the room temperature is set to the target set temperature, and the relative humidity in the room is reduced, so that the room has a comfortable target temperature and humidity. In other words, when the room temperature and absolute humidity are low and you do not feel much humid, the outside temperature is low and the COP of the refrigeration cycle is low.
Therefore, the heating temperature is greatly increased to reduce the relative humidity mainly due to the heating power. When the room temperature is much lower than the target set temperature and it is desired to lower the room humidity, the operation may be switched to the heating operation.

When the above control is performed, naturally, as shown in FIG. 4, the saturation temperature line (100% relative humidity) is obtained by connecting the room temperature / humidity and the target temperature / humidity on the psychrometric chart.
%) When the dry-bulb temperature at the point where it hits the line becomes, for example, 5 ° C. or less, not only does the cooling capacity of the air conditioner decrease, but also
Since the frost may be formed due to the fluctuation of the outside air temperature, the heating is performed from this point. That is, for example, when the temperature becomes 0 ° C. which is 5 ° C. or less, a line connecting the 5 ° C. saturation humidity point and the target temperature / humidity hits the sensible heat line of the room temperature / humidity (first temperature).
The required heating power is determined from the enthalpy difference between this point and the indoor temperature / humidity, and the temperature of the first indoor heat exchanger is set so as to obtain the required heating power. Thus, the opening degree of the first throttle mechanism is controlled.

In general, the heat dissipation capacity (condensing capacity) with respect to the cooling capacity (cooling capacity) of the refrigeration cycle during the cooling operation.
Is about 1.3 at CT = 45 ° C. and ET = 10 ° C., and the first indoor heat exchanger 4
Becomes a condenser, and the heat radiation capacity further increases, so that the condensation temperature decreases, and the evaporation temperature also decreases. Therefore, it may not be possible to cope simply by fully opening the first throttle adjustment mechanism 3. Corresponds to reducing the rotation speed of the outdoor fan or increasing the rotation speed of the compressor 1 as described later.

Furthermore, as described above, since the area ratio between the condenser and the evaporator is generally determined according to the ratio of the condensation capacity to the cooling capacity (1.3), it functions as a condenser. When the area ratio of the second indoor heat exchanger 6 to the first indoor heat exchanger 4 is set to be 1 or more, it is almost the same as the case where the rotation speed of the outdoor fan is decreased and the condensation temperature is increased, and Since it is possible to cope with a decrease in temperature, a user-friendly air conditioner can be obtained.

Further, in the above-described case where the throttle amount is increased, the refrigerant accumulates in the outdoor heat exchanger 2, so that the pressure (temperature) on the outdoor heat exchanger side slightly increases, and the first indoor heat exchanger Since the temperature also rises, it goes without saying that control is performed while taking these factors into account.

In a cooling operation or a heating operation other than the reheat dehumidifying operation, the refrigerant is caused to flow in the main circuit without flowing through the second throttle adjusting mechanism, and the first and second indoor heat exchangers 4 and 4 are operated. 6 both are operated by functioning as an evaporator or a condenser.

As described above, in the air conditioner for reheating and dehumidifying indoor air, the control means controls the opening of the first throttle adjusting mechanism based on the temperature of the first indoor heat exchanger. The ratio between the latent heat capacity and the sensible heat capacity of the air conditioner substantially matches the ratio between the indoor sensible heat load and the latent heat load while adjusting the amount of heating of the indoor air passing through the first indoor heat exchanger. Therefore, even if the indoor load changes, the indoor temperature will be adjusted to the target temperature / humidity state following this change. can get.

Further, the control means may adjust the first throttle control so that the temperature of the first indoor heat exchanger becomes equal to or higher than the temperature of the indoor air when the temperature of the indoor air is equal to or lower than the target set temperature. Since the opening degree of the mechanism is controlled, a highly reliable air conditioner that reliably sets the indoor temperature to the target temperature while heating the air passing through the first indoor heat exchanger to make the room a comfortable temperature and humidity. can get.

[0059] The control means may control the first indoor heat exchanger so that the temperature of the first indoor heat exchanger is lower than the temperature of the indoor air when the temperature of the indoor air is higher than a target set temperature.
Control the opening degree of the throttle adjusting mechanism of the first embodiment, so that the air passing through the first indoor heat exchanger is not overheated and wasteful energy is not supplied, so that the room can be kept at a comfortable temperature and humidity with high reliability. An air conditioner is obtained.

Embodiment 2 FIG. 1 is a schematic configuration diagram of an air conditioner according to Embodiment 1 of the present invention. In this figure, 1 is a compressor, 2 is an outdoor heat exchanger, and 3 is a first throttle such as an electric expansion valve. An adjusting mechanism, 4 is a first indoor heat exchanger, 5 is a second throttle adjusting mechanism composed of a fixed opening orifice, capillary, electric expansion valve, etc., 6 is a second indoor heat exchanger, and 7 is an indoor heat exchanger. A blower 8 is an outdoor blower. In addition, the second throttle adjusting mechanism 5 provided between the first indoor heat exchanger and the second indoor heat exchanger in this figure uses a porous body for silencing the refrigerant sound passing therethrough. A main circuit having a solenoid valve 6 which is opened in the cooling operation and closed in the dehumidifying operation is provided in parallel with the second throttle adjusting mechanism 5.

In FIG. 11, reference numeral 11 denotes an indoor humidity detecting means which is provided indoors and detects the relative humidity in the room. Reference numeral 12 denotes a room temperature sensor which is provided indoors and detects the indoor temperature.
Is a first inlet temperature sensor that is provided in the first indoor heat exchanger 4 and detects an inlet temperature of the heat exchanger, and 14 is provided in the second indoor heat exchanger 4 and is an inlet of the heat exchanger. A second inlet temperature sensor for detecting temperature, 15 is an outside air temperature sensor, 16 is a remote control light receiving unit (not shown) provided on the outer surface of the indoor unit and receiving a signal from a remote controller 17, and 17 is a target in the room. It is a remote controller for instructing operation modes such as temperature / humidity, cooling / heating, and reheating / dehumidifying operation.

[0062] Reference numeral 9 in this figure is provided in the indoor unit, and controls each device (for example, the indoor fan 7, the second aperture adjustment mechanism 5, etc.) in the indoor unit based on signals from the sensors. And an indoor microcomputer that communicates with the outdoor microcomputer 10. The indoor microcomputer 10 is provided in the outdoor unit, communicates with the outdoor microcomputer 10, and controls each device (for example, the compressor 1) in the outdoor unit based on signals from the sensors. And the number of revolutions of the outdoor fan 8, the opening degree of the first throttle adjusting mechanism 3, and the like. The control means (not shown) includes the outdoor microcomputer 10, the indoor microcomputer 9, and the like. You.

Next, the operation configured as described above will be described. First, during the cooling operation, the control means closes the second throttle adjusting mechanism 5 and opens the solenoid valve of the main circuit. The indoor heat exchangers 4 and 6 function as evaporators, and cool the room while controlling the amount of refrigerant only with the first throttle adjustment mechanism 3. At this time, the control means controls the number of revolutions of the compressor based on the temperature difference between the room temperature and the target set temperature so that the room temperature quickly reaches the target set temperature.

Next, when the indoor temperature reaches the target set temperature, the control means closes the solenoid valve of the main circuit, and the refrigerant flows from the first indoor heat exchanger through the second throttle adjusting mechanism 5 to the second indoor heat exchanger. And the first throttle adjustment mechanism 3 is adjusted so that the first indoor heat exchanger functions as a condenser, and the first throttle adjustment is performed. Mechanism 3
Through the opening degree, the (evaporation) temperature of the second indoor heat exchanger 6 functioning as an evaporator is controlled to be equal to or lower than the dew point temperature of the indoor air, and passes through the second indoor heat exchanger 6. While cooling the air, it heats the room air that has passed through the first indoor heat exchanger 4 and mixes these room airs to form an appropriate temperature
After the humidity is adjusted, the air is blown into the room from the air outlet to perform the reheat dehumidification operation.

At this time, if the mode is switched to the reheat dehumidifying operation in a state where the room temperature is not at the target set temperature, that is, in a state A in which the sensible heat capacity (cooling capacity) is insufficient in FIG. In the thermal dehumidifying operation, since a heating power is applied, it takes time to reach the target room temperature. Therefore, the cooling operation is switched to the reheat dehumidifying operation after the room temperature substantially reaches the target set temperature. In other words, in the state B or C where the indoor temperature and the target set temperature in FIG. 10 become substantially equal, the operation is switched from the cooling operation to the reheat dehumidification operation.

Even if the indoor temperature is at the target set temperature, if the rotational speed of the compressor at the target set temperature is equal to or higher than the predetermined rotational speed, heating power is applied in this reheat dehumidifying operation, and as described above. It is necessary to increase the rotation speed of the compressor during
Alternatively, since the temperature difference between the outside air temperature and the indoor temperature (indoor sensible heat load) is large, it is determined that the relative humidity in the room will be reduced if the absolute humidity is taken, as compared to the case where the difference between indoor and outdoor (indoor sensible heat load) is small. The control means determines that it is not necessary to lower the relative humidity of the indoor air, and does not switch from the cooling operation to the reheat dehumidification operation.

Next, in the reheat dehumidifying operation, the indoor heat exchanger is divided into the first and second indoor heat exchangers 4 and 6 as described above. Only the evaporator serves as an evaporator, the cooling capacity of the evaporator is reduced to about half, and the heat radiation capacity of the condenser increases. Therefore, control is performed in consideration of this.

Therefore, for example, in the present invention in which the indoor load and the equipment capacity are balanced by controlling the inverter (the number of revolutions of the compressor), the compressor at the end of the cooling operation when the indoor temperature reaches the target set temperature is used. When the operation is switched to the dehumidifying cooling operation at the rotation speed of the outdoor fan or the outdoor fan, as described above, the first indoor heat exchanger 4 functions as a condenser to heat the passing air, and the capacity of the condenser (radiation capacity) increases. And, because the evaporator capacity decreases, the indoor temperature rises, and in order to prevent this, the number of revolutions of the compressor during the cooling operation that has reached the target set temperature is further increased, and the number of revolutions is increased. The required amount of heating is applied so that the target set humidity is achieved while the room is maintained at the target set temperature by the capacity component, and the indoor air is set to a comfortable target temperature and humidity.

That is, for example, when the indoor relative humidity is higher than the target relative humidity, the first indoor heat exchanger changes from an evaporator to a condenser, and the indoor air is heated and the cooling of the heat exchanger is further performed. In consideration of the decrease in capacity, increase the rotation speed of the compressor.When the indoor relative humidity is lower than the target relative humidity, reduce the rotation speed of the compressor, and at the same time, maintain the rotation speed of the compressor. To control.

In other words, in the case where the opening degree of the first throttle adjusting mechanism is changed based on the refrigerant temperature at the outlet of the second indoor heat exchanger 6 as in the present invention, the rotation speed of the compressor is changed and the refrigeration is changed. By changing the amount of circulating refrigerant in the cycle, the temperature of the refrigerant at the outlet of the second indoor heat exchanger 6 changes, and the capacity ratio between the evaporation capacity and the condensation capacity of the refrigeration cycle also changes.
Because the heating power (temperature) of the indoor heat exchanger changes greatly,
In consideration of this, first, the cooling capacity decrease described above,
That is, the number of rotations of the compressor for maintaining the indoor target set temperature is determined, and then the cooling capacity for extracting the heating power for controlling the humidity of the indoor air is increased, in other words,
As shown in FIG. 3, the heating amount corresponding to the increased cooling capacity is obtained from the required heating amount on the air side, and the rotational speed of the compressor corresponding to the required heating amount is determined. The number is added to the number of rotations of the compressor at the target set temperature, and is controlled to match the indoor load via the opening of the first throttle adjustment mechanism as shown in FIGS.

In this control, when the outside air temperature (condensing temperature) is low or high and the heating power is insufficient or too large, the number of rotations of the outdoor fan is changed according to the outside air temperature or the like. Correspond.

As described above, when the room temperature reaches the target temperature, the operation is switched from the cooling operation to the reheat dehumidification operation. Therefore, the room temperature is maintained at the target temperature and the room humidity is automatically and quickly set to the target humidity. As a result, an easy-to-use air conditioner that can quickly and comfortably maintain the temperature and humidity in the room can be obtained.

Embodiment 3 In the third embodiment, in the configuration and operation of the first and second embodiments, when performing the reheat dehumidifying operation, the outside air temperature or the indoor load changes, and as a result, the temperature of the outdoor heat exchanger 2 or When the ratio between the indoor sensible heat load and the latent heat load changes, the rotation speed of the outdoor fan 8 is controlled to maintain the temperature (heating power) of the first indoor heat exchanger or change the heating power. Things. That is,
When the outside air temperature decreases or increases, or when the ratio of the latent heat load to the indoor sensible heat load increases or decreases, as shown in FIGS.
Alternatively, the rotation speed (wind speed) of the outdoor fan 8 is decreased or increased to change the temperature (heating power) of the first indoor heat exchanger as the heating means, and the ratio between the indoor sensible heat load and the latent heat load. Is approximately equal to the ratio between the sensible heat capacity and the latent heat capacity of the air conditioner.

In such a configuration, when the outdoor fan speed is reduced, as shown in FIG. 7, the heat radiation capacity of the outdoor heat exchanger 2 is reduced, the condensing temperature rises, and the condensing temperature rises. Accordingly, the first indoor heat exchanger 4 which is a heating means
The condensing temperature (heating temperature) also increases, the heat radiation capacity (heating amount) of the indoor heat exchanger 4 increases, and the heat radiation enthalpy difference also increases from the condensing amount B to the condensing amount A. Conversely, when the outdoor fan speed is increased, the condensing temperature on the outdoor side decreases, and the condensing temperature (heating temperature) of the first indoor heat exchanger 4 as a condenser is increased.
Therefore, the temperature difference from the indoor temperature becomes small, the heat radiation capacity (heating amount) of the indoor heat exchanger 4 decreases, and the heat radiation enthalpy difference also decreases.

Therefore, when the outside air temperature, which is closely related to the indoor sensible heat load, decreases and the heating power decreases, the outdoor fan speed is decreased to increase and balance the heating power, and conversely, the outdoor air temperature is reduced. Rises, increase the outdoor fan speed,
Lower the heating power and balance it, or
When the indoor sensible heat load or the latent heat load changes, and the ratio between the sensible heat load and the latent heat load changes, as shown in FIG. The ratio between the capacity and the latent heat capacity is made to correspond to the ratio between the indoor sensible heat load and the latent heat load so that it is possible to respond to changes in the indoor load. In other words, when the sensible heat ratio line (SHF), which is the gradient of the indoor temperature / humidity relative to the indoor target temperature / humidity, changes, the number of rotations of the outdoor fan 8 is controlled to match the changed sensible heat ratio line.

As described above, the outdoor fan is set so that the ratio between the indoor sensible heat load and the latent heat load substantially matches the ratio between the sensible heat capacity and the latent heat capacity of the air conditioner in accordance with changes in the indoor load and the outside air temperature. Since the air conditioner 8 is controlled, it is possible to cope with changes in the indoor load and the outside air temperature, so that a more reliable air conditioner can be obtained.

Embodiment 4 In the fourth embodiment, in the configuration and operation of the second embodiment, when switching from the cooling operation to the reheat dehumidification operation, the compressor is stopped for a predetermined time and then switched.

That is, in the fourth embodiment, while the refrigerant is flowing, the operation is switched from the reheating dehumidifying operation to the cooling operation, or conversely, the operation is switched from the cooling operation to the reheating dehumidifying operation to open and close the main circuit. The solenoid valve) cannot be opened or closed because of the relationship between the refrigerant pressure difference before and after the on-off valve or the relationship of the kinetic energy of the refrigerant flow even if the solenoid valve is opened or closed. When the operation mode switching signal is received from a remote controller or the like, the compressor is stopped for a predetermined period of time, and after eliminating the differential pressure and kinetic energy of the refrigerant, the operation is switched from the reheating dehumidifying operation to the cooling operation, or from the cooling operation to the reheating dehumidifying operation. The operation mode is switched to.

In this case, since the opening and closing operation of the second aperture adjustment mechanism is smooth and the operation mode can be switched reliably, the reliability of reliably performing the cooling operation and the reheat dehumidification operation is ensured. A high air conditioner can be obtained.

Embodiment 5 In the fifth embodiment, in the configuration and operation of the first to fourth embodiments, the frequency of the compressor during the reheating operation is controlled based on the difference between the indoor humidity and the target set humidity. When the indoor humidity is higher than the target set humidity despite the target set temperature, the temperature difference is corrected to control the frequency of the compressor.

That is, in the fifth embodiment, FIG.
As shown in the above, in the case of controlling the frequency of the compressor during the reheating operation based on the temperature difference between the room temperature and the set temperature (sensible heat load), if the temperature difference between the room temperature and the set temperature becomes small, for example, The indoor humidity is higher than the target humidity, and even if an attempt is made to reduce the high humidity, the frequency of the compressor does not increase, so that the target humidity is not reached.

Therefore, if the humidity difference between the room humidity and the set humidity is equal to or more than a certain value, it is determined whether or not the temperature difference between the room temperature and the set temperature is not less than a certain value. If the temperature difference is equal to or more than a predetermined value, control is performed based on the temperature difference.If the temperature difference is not equal to or more than the predetermined value, a correction value is obtained from a correction table for each preset temperature difference and each humidity difference. The detected temperature difference is corrected by the obtained correction value, and the frequency of the compressor is controlled based on the corrected temperature difference.

In this manner, since the indoor humidity can be reliably set to the target set humidity, a highly reliable air conditioner that makes the indoor comfortable can be obtained.

Embodiment 6 FIG. In the sixth embodiment, the configuration and operation of the first to fifth embodiments are provided on the entrance side and the exit side of the second aperture adjustment mechanism 3, and the entrance side and the exit side of the second aperture adjustment mechanism 3 are provided. Clogging detection means (not shown) for detecting a characteristic value corresponding to the temperature or pressure of
This is to detect and control clogging of the second throttle adjustment mechanism 5 due to impurities or the like during the reheat dehumidifying operation.

Next, this operation will be described. First,
If impurities or the like in the refrigerant are clogged in the opening during the reheating operation in which the refrigerant flows through the second throttle adjustment mechanism 5, the refrigerant stops flowing, and the inlet side and the outlet of the second throttle adjustment mechanism 5 When the clogging detection means detects that the temperature difference or the pressure difference with the side approaches, the control means determines that the room temperature has risen or the compressor is in the overheating operation state, and the solenoid valve of the main circuit Is fully opened, and the first and second indoor heat exchangers are switched to a cooling operation in which they function as evaporators.

As described above, the clogging detecting means
The clogging state of the second throttle adjusting mechanism is detected from a characteristic value corresponding to the temperature or pressure of the inlet / outlet refrigerant of the second throttle adjusting mechanism. As a result, an air conditioner with improved reliability can be obtained.

Further, when the control means receives a clogging signal of the second throttle adjusting mechanism from the clogging detecting means, the refrigerant flows from the first indoor heat exchanger to the second indoor heat exchanger. Since the on-off valve of the main circuit is opened, the room temperature rises, and the compressor is not operated in the overheating operation state. can get.

When a so-called incompatible oil (eg, alkylbenzene oil) that does not dissolve in the refrigerant is used as the refrigerating machine oil in Embodiments 2 to 6 described above, the refrigerating machine oil does not accumulate inside the solenoid valve, and Air conditioner that can reliably switch from cooling operation to reheat dehumidification operation because it is possible to prevent opening and closing operation due to homing phenomena etc. at the valve part because the refrigeration oil will not lie in the refrigerating machine oil. Machine is obtained. .

In the first to sixth embodiments described above, the refrigerant is R32 of a single refrigerant or R32 of a non-azeotropic mixture.
It may be 410C, R407C, or a hydrocarbon-based refrigerant such as R50 or R600.

[0090]

According to the air conditioner of the present invention, in the air conditioner for reheating and dehumidifying indoor air, the control means includes:
Controlling the opening degree of the first throttle adjusting mechanism based on the temperature of the first indoor heat exchanger, and adjusting the amount of heating to the indoor air passing through the first indoor heat exchanger; Since the ratio between the sensible heat capacity and the latent heat capacity of the air conditioner is approximately equal to the ratio between the sensible heat load and the latent heat load of the indoor air, even if the indoor load changes, the indoor space follows the change. Is brought to the target temperature / humidity state, so that a highly reliable air conditioner that keeps the room at a comfortable temperature and humidity can be obtained.

The control means may control the first indoor heat exchanger so that the temperature of the first indoor heat exchanger becomes equal to or higher than the temperature of the indoor air when the temperature of the indoor air is equal to or lower than a target set temperature.
Control the opening degree of the throttle adjusting mechanism of the first embodiment, so that the air passing through the first indoor heat exchanger is overheated, while the indoor temperature is reliably set to the target temperature and the indoor air is heated to a comfortable temperature and humidity. A harmony machine is obtained.

[0092] The control means may control the first indoor heat exchanger so that the temperature of the first indoor heat exchanger becomes lower than the temperature of the indoor air when the temperature of the indoor air is higher than a target set temperature.
Control the opening degree of the throttle adjusting mechanism of the first embodiment, so that the air passing through the first indoor heat exchanger is not overheated and wasteful energy is not supplied, so that the room can be kept at a comfortable temperature and humidity with high reliability. An air conditioner is obtained.

The control means controls the number of revolutions of the compressor based on the temperature difference between the room temperature and the target set temperature. When the room temperature reaches the target set temperature, the cooling operation is restarted. By switching to thermal dehumidification operation, the indoor temperature is maintained at the target temperature and the indoor humidity is automatically adjusted to the target humidity quickly. can get.

When the rotational speed of the compressor at the target set temperature is equal to or higher than a predetermined rotational speed, the control means determines that it is not necessary to lower the relative humidity of the indoor air, and resumes from the cooling operation. Since the operation is not switched to the thermal dehumidification operation, the reheat dehumidification operation can be reliably performed, so that an easy-to-use air conditioner that can surely quickly and comfortably maintain the temperature and humidity in the room can be obtained.

Further, when the reheating dehumidifying operation is performed, the control means determines the opening degree of the first throttle adjusting mechanism based on the difference between the relative humidity of the indoor air and the indoor target humidity by the compressor. The number of revolutions of the air conditioner is controlled to adjust the capacity ratio between the evaporating capacity and the condensing capacity of the air conditioner.
Since the air conditioner is brought into the humidity state, a highly reliable air conditioner that keeps the room at a comfortable temperature and humidity can be obtained.

The control means corrects the temperature difference between the room temperature and the target set temperature based on the humidity difference between the relative humidity of the indoor air and the target set humidity, and based on the correction result, the rotational speed of the compressor. Is controlled, and the indoor humidity is set to the target set humidity. Therefore, the indoor humidity can be reliably set to the target set humidity, so that a highly reliable air conditioner that provides comfortable indoor air can be obtained.

Further, the control means controls the number of revolutions of the fan of the outdoor heat exchanger in accordance with the change in the indoor temperature / humidity with respect to the target temperature / humidity in the room, so as to reduce the sensible heat load in the room. Since the ratio with the latent heat load was made to substantially match the ratio between the sensible heat capacity and the latent heat capacity of the air conditioner, it becomes possible to cope with changes in the indoor load and the outside air temperature,
Further, a highly reliable air conditioner can be obtained.

When the control means switches from the cooling operation to the reheating dehumidifying operation or from the reheating dehumidifying operation to the cooling operation, the operation of the compressor is stopped for a predetermined time, and the first or second compressor is stopped. Since the difference between the inlet and outlet refrigerant pressures of the throttle control mechanism is substantially equalized, the opening and closing operation of the second throttle control mechanism is smooth, and the operation mode can be switched reliably. A highly reliable air conditioner that reliably operates can be obtained.

Also, the clogging detecting means is provided at the entrance and exit of the second throttling adjustment mechanism, and detects the clogging state from the characteristic value corresponding to the temperature or pressure of the refrigerant at the entrance and exit of the second throttling adjustment mechanism. Since the clogged state of the second throttle adjusting mechanism can be understood, an air conditioner with improved reliability can be obtained.

When the control means receives a clogging signal of the second throttle adjusting mechanism from the clogging detection means, the refrigerant flows from the first indoor heat exchanger to the second indoor heat exchanger. Since the on-off valve of the main circuit is opened so as to flow, the room temperature does not rise, and the compressor is not operated in an overheated operation state. Machine is obtained.

Further, a porous body is arranged in series on the inlet side or the outlet side of the second throttle adjusting mechanism, and a refrigerant sound flowing from the first indoor heat exchanger to the second indoor heat exchanger is provided. Since the refrigerant is absorbed, the refrigerant noise is reduced, and a quiet air conditioner is obtained.

Further, since the refrigerating machine oil of the compressor is an incompatible oil that is insoluble in the refrigerant, the refrigerating machine oil does not accumulate inside the solenoid valve, and the opening and closing operation of the valve portion is hindered by a homing phenomenon or the like. Therefore, an air conditioner with improved reliability of reliably switching from the cooling operation to the reheat dehumidification operation can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram in Embodiments 1 and 2 of the present invention.

FIG. 2 is a Mollier chart in which the opening degree of a first aperture adjusting mechanism according to Embodiment 1 of the present invention is changed.

FIG. 3 is a related diagram showing a relationship between an air side and a refrigerant side according to the first embodiment of the present invention.

FIG. 4 is a related diagram showing a relationship between an air side and a refrigerant side according to the first embodiment of the present invention.

FIG. 5 is a diagram showing a relationship between an opening degree of a first throttle adjusting mechanism and a refrigeration cycle in the first and second embodiments of the present invention on a Mollier diagram.

FIG. 6 is a diagram showing a relationship between sensible heat and latent heat capacity (load) with respect to an opening degree of a first aperture adjusting mechanism in Embodiments 1 and 2 of the present invention.

FIG. 7 is a diagram showing a relationship between a rotation speed of an outdoor fan and a refrigeration cycle according to Embodiment 3 of the present invention on a Mollier diagram.

FIG. 8 is a diagram showing a relationship between sensible heat and latent heat capacity (load) with respect to the rotation speed of a compressor and an outdoor fan according to Embodiment 3 of the present invention.

FIG. 9 is a diagram showing a relationship between sensible heat and latent heat capacity (load) with respect to an opening degree of a first aperture adjusting mechanism in Embodiments 1 and 2 of the present invention.

FIG. 10 is a correlation diagram of the first throttle adjustment mechanism (the number of rotations of the compressor) and the number of rotations of the outdoor fan when switching from cooling to reheating according to the first and second embodiments of the present invention.

FIG. 11 is a schematic configuration diagram of a related art.

FIG. 12 is an explanatory diagram of conventional indoor fan control.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 compressor, 2 outdoor heat exchanger, 3 first throttle adjustment mechanism, 4 first indoor heat exchanger, 5 second throttle adjustment mechanism, 6 second indoor heat exchanger, 7 indoor blower, 8
Outdoor blower, 9 indoor control unit, 10 outdoor control unit, 11
Humidity sensor, 12 room temperature sensor, 13 indoor condensation temperature sensor, 14 indoor evaporation temperature sensor, 15 outside air temperature sensor, 16 remote control light receiving unit, 17 remote control.

Continued on the front page (72) Inventor Tatsuo Seki 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Toshiaki Yoshikawa 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Co., Ltd. In-company (72) Inventor Fumitake Unezaki 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation F-term (reference) 3L060 AA06 AA07 CC02 CC07 DD07 EE21 EE25 EE26

Claims (13)

[Claims] A first indoor heat exchanger functioning as a compressor, an outdoor heat exchanger, a first throttle adjusting mechanism, a condenser, a second indoor heat exchanger;
A second indoor heat exchanger functioning as a throttle adjusting mechanism and an evaporator is sequentially connected by piping, and in an air conditioner that reheats and dehumidifies indoor air, the control means controls the temperature of the first indoor heat exchanger. Controlling the opening degree of the first throttle adjusting mechanism based on the temperature and adjusting the amount of heating of the indoor air passing through the first indoor heat exchanger while controlling the sensible heat capacity and the latent heat capacity of the air conditioner. The air conditioner is characterized in that the ratio of the air conditioner substantially matches the ratio of the sensible heat load and the latent heat load of the room air. 2. The control device according to claim 1, wherein the temperature of the first indoor heat exchanger is equal to or higher than the temperature of the indoor air when the temperature of the indoor air is equal to or lower than a target set temperature. 2. An opening degree of the mechanism is controlled.
The air conditioner according to item 1. 3. The first throttle adjuster so that when the temperature of the indoor air is equal to or higher than a target set temperature, the temperature of the first indoor heat exchanger is equal to or lower than the temperature of the indoor air. 2. An opening degree of the mechanism is controlled.
The air conditioner according to item 1. 4. A compressor, an outdoor heat exchanger, a first throttle adjusting mechanism, a first indoor heat exchanger, a second throttle adjusting mechanism, and a second throttle adjusting mechanism.
A main circuit having an on-off valve connected to the second heat adjusting mechanism in parallel with the indoor heat exchanger, and flowing a refrigerant through the main circuit. In an air conditioner that cools the room and reheats and dehumidifies the room by flowing a refrigerant through the second throttle adjustment mechanism, a control unit may control the temperature based on a temperature difference between the room temperature and a target set temperature. An air conditioner that controls the number of revolutions of the compressor to switch from the cooling operation to the reheat dehumidification operation when the room temperature reaches a target set temperature. 5. The control unit determines that it is not necessary to lower the relative humidity of the indoor air when the rotation speed of the compressor at the target set temperature is equal to or higher than a predetermined rotation speed, and determines from the cooling operation that the cooling operation has been restarted. The air conditioner according to claim 4, wherein the operation is not switched to the thermal dehumidification operation. 6. The compressor according to claim 1, wherein when the reheating dehumidifying operation is performed, the compressor adjusts an opening degree of the first throttle adjusting mechanism based on a difference between a relative humidity of the indoor air and a target indoor humidity. The air conditioner according to any one of claims 4 and 5, wherein the air conditioner is controlled by controlling the number of revolutions of the air conditioner to adjust a capacity ratio between an evaporating capacity and a condensing capacity of the air conditioner. 7. The control means corrects a temperature difference between the room temperature and a target set temperature based on a humidity difference between a relative humidity of the room air and a target set humidity, and based on a result of the correction, corrects the compression. The air conditioner according to claim 6, wherein the number of revolutions of the air conditioner is controlled so that the room humidity becomes the target set humidity. 8. The control means controls the number of revolutions of a fan of the outdoor heat exchanger in accordance with a change in the room temperature and humidity with respect to a target temperature and humidity in the room, so that a sensible heat load in the room is reduced. 8. The air conditioner according to claim 7, wherein the ratio of the latent heat load to the ratio of the sensible heat capacity to the latent heat capacity of the air conditioner is substantially matched. 9. When the control means switches from the cooling operation to the reheating dehumidification operation or from the reheating dehumidification operation to the cooling operation, the operation of the compressor is stopped for a predetermined time, and the first operation is stopped.
5. The air conditioner according to claim 4, wherein an inlet / outlet refrigerant pressure difference of the second throttle adjusting mechanism is made substantially equal. 6. 10. A compressor, an outdoor heat exchanger, a first throttle adjusting mechanism, a first indoor heat exchanger, a second throttle adjusting mechanism, and a second indoor heat exchanger are sequentially connected by piping and A main circuit having an on-off valve connected in parallel with the second throttle adjusting mechanism, and cooling the room by flowing a refrigerant through the main circuit, thereby controlling the second throttle adjusting mechanism. In the air conditioner that reheats and dehumidifies the room by flowing a refrigerant through the air conditioner, clogging detection means is provided at the entrance and exit of the second throttle adjustment mechanism, and the temperature of the entrance and exit refrigerant of the second throttle adjustment mechanism is Alternatively, an air conditioner characterized by detecting a clogging state from a characteristic value corresponding to pressure. 11. When the control means receives a clogging signal of the second throttle adjusting mechanism from the clogging detection means, refrigerant flows from the first indoor heat exchanger to the second indoor heat exchanger. The air conditioner according to claim 10, wherein the on-off valve of the main circuit is opened so as to flow. 12. A porous body is arranged in series on an inlet side or an outlet side of the second throttle adjusting mechanism, and generates a refrigerant sound flowing from the first indoor heat exchanger to the second indoor heat exchanger. The air conditioner according to any one of claims 4 to 11, wherein the air conditioner is configured to absorb the air. 13. The refrigerant oil of the compressor is an immiscible oil that does not mix with the refrigerant.
13. The air conditioner according to any one of to 12.