JP2002031371A - Air conditioner - Google Patents

Abstract

(57) [Summary] A primary side circuit and a secondary side capable of shortening the time required to reach a set temperature at the time of operation switching and enabling individual ON / OFF of a plurality of indoor units connected in series piping. An air conditioner having a circuit is provided. A first side passage (C) is connected between a four-way valve (2), a refrigerant heat exchanger (3) and an expansion valve (4), and the first side passage is filled with a heat transfer medium (8b) in a heat exchange tank (8a). The auxiliary water-to-refrigerant heat exchanger 8 to which the heat supply unit 8c is connected is provided, and both ends of the second side path D connected to the heat receiving unit 8d of the auxiliary water-to-refrigerant heat exchanger are provided in the secondary circuit B. While connected in parallel, the first expansion valve 9 between the four-way valve and the refrigerant heat exchanger, the second expansion valve 10 between the four-way valve and the heat supply part of the auxiliary water-to-refrigerant heat exchanger Provision is made respectively, a first temperature detector 11 for detecting a water temperature of the second bypass in the secondary circuit, a first valve 12 and a second valve between the second bypass and the secondary circuit. Two valves 13 were provided respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner having a primary side circuit and a secondary side circuit. A plurality of indoor units connected to a pipe can be individually turned on and off.

[0002]

2. Description of the Related Art A conventional air conditioner having a plurality of circuits includes, for example, a compressor 1 and a four-way valve 2 as shown in FIG.
, A refrigerant heat exchanger 3, an expansion valve 4, and a heat supply unit 5c of the water-to-refrigerant heat exchanger 5 which is heat-exchanged via the heat transfer medium 5b filled in the heat exchange tank 5a. The connected primary circuit A, the heat receiving section 5d of the water-to-refrigerant heat exchanger 5, the circulation pump 6, and the water heat exchangers 7a, 7b
.. 7n and a secondary circuit B sequentially connected with piping were formed as a so-called chiller unit capable of performing a cooling and heating operation.

However, in the chiller unit, the cooling operation and / or the heating operation of the plurality of indoor units 7 connected to the secondary circuit B are performed by using the chilled water obtained from the water-to-refrigerant heat exchanger 5 and the cooling operation. Or by using hot water, when switching from the cooling operation to the heating operation and when switching from the heating operation to the cooling operation, due to the problem of heat transfer from the primary circuit A, until the temperature reaches a predetermined temperature. There was a problem that it took considerable time. The heat transfer problem will be described. The heat of the primary circuit A is transferred to the water-to-refrigerant heat exchanger 5.
Since the plate-type heat exchanger or the shell-and-tube type heat exchanger constitutes the above, heat is conducted to the water in the secondary circuit B, so that a predetermined time is required until a predetermined temperature is reached.

Further, in the conventional operation at a low outside air temperature, a method such as ON-OFF of the compressor 1 and air volume control by an outdoor blower (not shown) has been employed. There have been problems such as an increase and a decrease in the reliability of the device. Furthermore,
The water heat exchangers 7a, 7b provided in the plurality of indoor units 7
-Since 7n were connected in series, there was a problem that each of these indoor units 7 could not be individually turned on and off.

[0005]

SUMMARY OF THE INVENTION In view of the above problems, the present invention makes it possible to shorten the time required to reach a set temperature at the time of operation switching, and to separate a plurality of indoor units connected in series by pipes. It is an object of the present invention to provide an air conditioner having a primary side circuit and a secondary side circuit that can be turned on and off.

[0006]

In order to solve the above-mentioned problems, the present invention provides a compressor, a four-way valve, a refrigerant heat exchanger, an expansion valve, and a heat transfer medium filled in a heat exchange tank. A primary circuit in which a heat supply unit of a water-to-refrigerant heat exchanger that is heat-exchanged via a pipe is sequentially connected, a heat receiving unit of the water-to-refrigerant heat exchanger, a circulation pump, and a water heat exchanger. In the air conditioner which forms a secondary side circuit sequentially connected with a pipe, and performs a cooling and heating operation, the first side path is provided between the four-way valve, the refrigerant heat exchanger and the expansion valve. The auxiliary water-to-refrigerant heat exchanger connected to a heat supply unit in the heat exchange tank filled with the heat transfer medium in the first side passage is provided, and the auxiliary water-to-refrigerant heat is provided in the secondary circuit. The two ends of the second bypass connected to the heat receiving portion of the exchanger are connected in parallel, and the four-way valve and the refrigerant heat are connected. A first expansion valve is provided between the heat exchangers, and a second expansion valve is provided between the four-way valve and the heat supply unit of the auxiliary water-refrigerant heat exchanger. A first temperature detector for detecting a water temperature is provided, and a first valve and a second valve are provided between the second bypass and the secondary circuit.

[0007] Further, the first temperature detector is provided on a water inlet side of the secondary circuit connected between the heat receiving portion of the water-to-refrigerant heat exchanger and the water heat exchanger. It has a configuration.

Further, an auxiliary circulation pump is provided on the second side passage.

Further, the second side path is connected to a water return side of the secondary side circuit connected between the heat receiving portion of the water-to-refrigerant heat exchanger and the water heat exchanger. It has become.

A plurality of the water heat exchangers are connected in series, and the plurality of water heat exchangers are each provided with a water circulation bypass circuit having an open / close valve.

Further, a second temperature detector for detecting a water temperature of the second bypass is provided on a water return side of the secondary circuit, and the first valve is provided in accordance with the water temperature detected by the second temperature detector. And the second valve is opened.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below as examples based on the attached drawings. FIG. 1 is a refrigeration cycle diagram of an air conditioner having a primary side circuit and a secondary side circuit according to the present invention. As in the above-described basic configuration in the related art, a compressor 1, a four-way valve 2, a refrigerant A water-to-refrigerant heat exchanger 5 that is heat-exchanged via a heat exchanger 3, an expansion valve 4, and a heat transfer medium 5b filled in a heat exchange tank 5a.
A primary side circuit A in which the heat supply unit 5c is sequentially connected with a pipe,
A heat receiving portion 5d of the water-to-refrigerant heat exchanger 5;
And the water heat exchangers 7a, 7b... 7n provided in the plurality of indoor units 7.
Are configured as a so-called chiller unit in which a secondary circuit B sequentially connected with a pipe is formed, so that a cooling and heating operation can be performed.

In the basic configuration described above, the arrival time to the set temperature at the time of operation switching can be shortened, and the plurality of indoor units 7 connected in series to each other are connected.
Will be described below.

A heat exchange tank in which a first side passage C is connected between the four-way valve 2 and the refrigerant heat exchanger 3 and the expansion valve 4, and the first side passage C is filled with a heat transfer medium 8b. Heat supply section in 8a
An auxiliary water-to-refrigerant heat exchanger 8 to which the auxiliary water-to-refrigerant heat exchanger 8 is connected is provided in the secondary circuit B.
Are connected in parallel at both ends of the second side path D connected to the second side path D.

A first expansion valve 9 is provided between the four-way valve 2 and the refrigerant heat exchanger 3, and a second expansion valve is provided between the four-way valve 2 and the heat supply portion 8c of the auxiliary water-refrigerant heat exchanger 8. 10 is provided, and the secondary circuit B is provided with a first temperature detector 11 for detecting the water temperature of the second side path D, and the first expansion is performed in accordance with the water temperature detected by the first temperature detector 11. The valve 9 and the second expansion valve 10 are opened and closed so that, for example, when the detected water temperature is increasing or decreasing, the refrigerant does not flow into the auxiliary water-refrigerant heat exchanger 8.

A first valve 12 and a second valve 13 are provided between the second side path D and the secondary side circuit B, respectively, so that the first valve 12 and the second valve 13 To shut off the inflow of cold and hot water from the auxiliary water-refrigerant heat exchanger 8, and only when switching from the cooling operation to the heating operation or from the heating operation to the cooling operation, the first valve 12 and the second valve The configuration is such that the two valves 13 are opened and closed.

With the above configuration, during the cooling operation, the second expansion valve 10 is opened and the first valve
By closing 12 and the second valve 13, the water in the second side passage D is supplied to the auxiliary water-refrigerant heat exchanger 8 by utilizing the heat supply of the high-pressure gas of the primary side circuit A. It can be converted to hot water, and when switching from the cooling operation to the heating operation, the water temperature of the secondary circuit B is about 5 to 5.
Since the temperature is 15 ° C., it takes a considerable time to reach the set temperature during the heating operation. Therefore, at the time of operation switching, the hot water (40 to 80 ° C.) stored in the second bypass D is supplied to the first By opening the valve 12 and the second valve 13 and flowing into the secondary circuit B, heat can be used, and the time until the set temperature is reached can be reduced.

During the heating operation, the second expansion valve 10
Is opened, and the first valve 12 and the second valve 13 are closed, so that the water in the second side passage D is subjected to the high pressure of the primary side circuit A by the auxiliary water / refrigerant heat exchanger 8. It becomes possible to convert the gas into cold water by using the heat received by the low-pressure liquid refrigerant, and when switching from the heating operation to the cooling operation, the water temperature of the secondary circuit B is about 40 to 80 ° C.,
Since it takes a considerable time to reach the set temperature of the cooling operation, at the time of operation switching, the cold water (5 to 15 ° C.) stored in the second bypass D is supplied to the first valve 12 and the second valve 13. Is opened to flow into the secondary side circuit B, thereby utilizing heat and shortening the time required to reach the set temperature.

In the cooling operation at a low outside temperature, the temperature of the circulating hot water in the second bypass D is detected by the first temperature detector 11 because the possibility of switching to the heating operation is the highest. By controlling the first expansion valve 9 and the second expansion valve 10, the amount of refrigerant circulating to the refrigerant heat exchanger 3 and the auxiliary water-refrigerant heat exchanger 8 is adjusted.

Further, since the temperature of the water circulating in the second side passage D is lower than a certain set value (about 80 ° C.), if the water temperature in the second side passage D becomes higher than the set value, The flow rate is adjusted by setting the second expansion valve 10 in the closing direction and the first expansion valve 9 in the opening direction, and the water temperature in the second bypass D is maintained at a certain value.

At the start of the cooling operation, the second expansion valve 10 is opened and the first expansion valve 9 is closed in order to increase the amount of refrigerant circulating to the auxiliary water-refrigerant heat exchanger 8. The circulating amount of the first expansion valve 9 and the second expansion valve 10 during the cooling / heating operation is controlled by controlling the water temperature in the second bypass D by the first temperature detector 11. This is done by detecting.

Further, ON-OFF of the plurality of indoor units 7
In the mixed operation, when a certain number of the water heat exchangers 7a, 7b,... 7n provided in the plurality of indoor units 7 are ON, the stopped indoor unit 7 is a bypass circuit 16 provided in each of the water heat exchangers 7a, 7b,.
Of the water heat exchangers 7a, 7b,... 7n is closed. When the indoor unit 7 performs the ON-OFF mixed operation, the heat addition in the indoor unit 7 fluctuates, and the temperature of the cold / hot water greatly changes. The temperature is detected by a second temperature detector 17 attached to the first valve 12 and the second valve 13 when the water temperature is lower than the set temperature (during cooling operation) or higher than the set temperature (during heating operation). And the cold / hot water stored in the second side passage D is allowed to flow into the secondary circuit B side (water return side) to stabilize the water temperature at the set temperature.

With the above configuration, as shown in FIG. 1, during the cooling operation, the second expansion valve 10 is opened and the first valve 12 and the second valve 13 are closed.
The water in the second bypass D is transferred to the auxiliary water-refrigerant heat exchanger 8.
This makes it possible to use the heat supply of the high-pressure gas of the primary circuit A to convert it to hot water, and when switching from the cooling operation to the heating operation, the water temperature of the secondary circuit B is about 5 to 15 C., it takes a considerable time to reach the set temperature of the heating operation. Therefore, when the operation is switched, the hot water (40 to 80 ° C.) stored in the second bypass D is supplied to the first valve 12. And the second valve 13 is opened to open the secondary circuit B
And an air conditioner having a primary side circuit and a secondary side circuit, which can utilize heat and reduce the time required to reach a set temperature.

[0024]

As described above, according to the present invention, the arrival time to the set temperature at the time of operation switching can be shortened, and a plurality of indoor units connected in series can be individually turned on and off. An air conditioner having the primary circuit and the secondary circuit described above.

[Brief description of the drawings]

FIG. 1 is a refrigeration cycle diagram of an air conditioner having a primary circuit and a secondary circuit according to the present invention.

FIG. 2 is a refrigeration cycle diagram of an air conditioner having a primary side circuit and a secondary side circuit according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Four-way valve 3 Refrigerant heat exchanger 4 Expansion valve 5 Water-to-refrigerant heat exchanger 5a Heat storage tank for water-to-refrigerant heat exchanger 5b Heat transfer medium for water-to-refrigerant heat exchanger 5c For water-to-refrigerant heat exchanger Heat supply unit 5d Heat receiving unit of water-to-refrigerant heat exchanger 6 Circulation pump 7 Indoor unit 7a, 7b ... 7n Water heat exchanger 8 Auxiliary water-to-refrigerant heat exchanger 8a Auxiliary water-to-refrigerant heat exchanger heat storage tank 8b Heat transfer medium of auxiliary water-refrigerant heat exchanger 8c Heat supply part of auxiliary water-refrigerant heat exchanger 8d Heat receiving part of auxiliary water-refrigerant heat exchanger 9 First expansion valve 10 Second expansion valve 11 First temperature detector 12 First valve 13 Second valve 14 Auxiliary circulating pump 15 Valve 15 'Inlet valve 16 Bypass circuit 17 Second temperature detector A Primary circuit B Secondary circuit C Primary circuit D Secondary circuit

Claims (6)

[Claims] 1. A compressor, a four-way valve, a refrigerant heat exchanger,
A primary circuit in which an expansion valve and a heat supply unit of a water-to-refrigerant heat exchanger that is heat-exchanged through a heat transfer medium filled in a heat exchange tank are sequentially connected by piping; The air conditioner that forms a secondary circuit in which the heat receiving portion of the heat exchanger, the circulation pump, and the water heat exchanger are sequentially connected to each other to perform a cooling and heating operation, wherein the four-way valve, the refrigerant An auxiliary water-refrigerant heat exchanger in which a first side path is connected between the heat exchanger and the expansion valve, and the first side path is connected to a heat supply unit in a heat exchange tank filled with a heat transfer medium. Provided in the secondary circuit, while connecting in parallel both ends of a second side path connected to the heat receiving portion of the auxiliary water-to-refrigerant heat exchanger, between the four-way valve and the refrigerant heat exchanger The first expansion valve, the second expansion valve between the four-way valve and the heat supply unit of the auxiliary water-refrigerant heat exchanger, respectively Provided, a first temperature detector for detecting the water temperature of the second side path in the secondary side circuit, between the second side path and the secondary side circuit,
An air conditioner comprising a first valve and a second valve. 2. The method according to claim 1, wherein the first temperature detector is provided on a water inlet side of the secondary circuit connected between the heat receiving unit of the water-to-refrigerant heat exchanger and the water heat exchanger. The air conditioner according to claim 1, wherein: 3. The air conditioner according to claim 1, wherein an auxiliary circulation pump is provided on the second side passage. 4. The second side path is connected to a water return side of the secondary side circuit connected between the heat receiving portion of the water-to-refrigerant heat exchanger and the water heat exchanger. The air conditioner according to claim 1, wherein: 5. The water heat exchanger according to claim 1, wherein a plurality of the water heat exchangers are connected in series, and the plurality of the water heat exchangers are each provided with a water circulation bypass circuit having an open / close valve. The air conditioner as described. 6. A second temperature detector for detecting a water temperature of the second side passage is provided on a water return side of the secondary circuit, and the first valve is provided in accordance with the water temperature detected by the second temperature detector. The air conditioner according to claim 1, wherein the second valve is opened.