JP2019196860A - Hot water supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water supply system capable of optimizing hot water filling time and energy efficiency. A hot water supply system includes a heat pump heat source device, a hot water storage tank that stores hot water heated by the heat pump heat source device, and a first hot water filling operation that fills a bathtub with hot water stored in the hot water storage tank. And a hot water supply circuit configured to execute hot water heated by the heat pump heat source device to the bathtub without supplying the hot water from the hot water tank to fill the bathtub, and a heat pump heat source device And a control unit that controls the hot water supply circuit, and the control unit is configured to execute the first hot water filling operation and the second hot water filling operation in combination based on the set hot water filling time. . [Selection diagram] Fig. 5

Description

  The present invention relates to a hot water supply system having a function of filling a bathtub.

  Patent Document 1 describes a hot water storage type water heater having a hot water filling function. This hot water storage type hot water heater has a hot water filling operation in which hot water stored in a hot water storage tank is filled in the bathtub, and the hot water heated by the heat pump unit is directly filled in the bathtub without being stored in the hot water storage tank. It is configured to be able to perform direct filling operation. The time zone in which the hot water filling operation is selected and the time zone in which the direct hot water operation is selected are set in advance by the user. A control device provided in the hot water storage type hot water heater selects and executes either a hot water hot water filling operation or a direct hot water filling operation based on the time information.

JP 2012-225544 A

  In the hot water hot water filling operation, hot water filling is performed using the hot water stored in the hot water storage tank, so that the hot water filling time can be shortened. However, in the hot water stored in the hot water storage tank, a heat dissipation loss corresponding to the hot water storage time occurs. On the other hand, in the direct hot water operation, the above heat loss does not occur. For this reason, the energy efficiency of direct hot water filling operation is higher than the energy efficiency of hot water hot water filling operation.

  Moreover, in a heat pump heat source machine, generally, equipment efficiency falls, so that boiling temperature becomes high temperature. In direct hot water filling operation, it is only necessary to boil the hot water of about 40 ° C required as hot water in the bathtub, while in hot water storage hot water operation, hot water of 65 ° C or higher is boiled for hot water storage in a hot water storage tank. It is necessary to raise. For this reason, the difference in energy efficiency between the direct hot water filling operation and the hot water storage hot water filling operation is further increased.

  However, the filling capacity of the direct filling operation depends on the ability of the heat pump heat source machine. For this reason, the hot water filling time in the direct hot water filling operation becomes longer than the hot water filling time in the hot water storage hot water filling operation.

  In the hot water storage type water heater of Patent Document 1, the hot water filling is performed by one of the hot water hot water filling operation and the direct hot water filling operation. As described above, when hot water filling is performed by hot water hot water filling operation, although the hot water filling time can be shortened, the energy efficiency is lowered. On the other hand, when hot water filling is carried out by direct hot water filling operation, although the energy efficiency can be increased, the hot water filling time becomes long. Therefore, the hot water storage type water heater of Patent Document 1 has a problem that it is difficult to optimize hot water filling time and energy efficiency.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a hot water supply system that can optimize hot water filling time and energy efficiency.

  A hot water supply system according to the present invention includes a heat pump heat source device that heats water, a hot water storage tank that stores at least a portion of hot water heated by the heat pump heat source device, and a hot water stored in the hot water storage tank. A first hot water operation for performing hot water filling, and a second hot water operation for supplying hot water heated by the heat pump heat source machine to the bathtub without going through the hot water storage tank and hot water filling the bathtub, And a control unit that controls the heat pump heat source unit and the hot water supply circuit, and the control unit performs the first hot water filling operation based on a set hot water filling time. And the second hot water filling operation are executed in combination.

  According to the present invention, the first hot water operation with low energy efficiency and high hot water filling speed and the second hot water operation with high energy efficiency and low hot water filling speed are combined based on the hot water filling time. The ratio of the second hot water filling operation can be made as high as possible within the hot water filling time. Therefore, it is possible to increase the energy efficiency of the hot water filling while preventing the hot water filling time from becoming long. Therefore, according to the present invention, the filling time and energy efficiency can be optimized.

It is the schematic which shows the whole structure of the hot water supply system which concerns on Embodiment 1 of this invention. It is a circuit diagram which shows the structure of the hot water supply apparatus with which the hot water supply system which concerns on Embodiment 1 of this invention is provided. It is a figure which shows the flow of the water in the heat pump direct hot water operation in the hot water supply apparatus with which the hot water supply system which concerns on Embodiment 1 of this invention is provided. It is a figure which shows the flow of the water in the tank filling operation in the hot-water supply apparatus with which the hot-water supply system which concerns on Embodiment 1 of this invention is provided. It is a graph which shows the concept of the energy-saving hot water filling control performed with the hot water supply system which concerns on Embodiment 1 of this invention. It is a flowchart which shows an example of the flow of control performed with the hot water supply system which concerns on Embodiment 1 of this invention. It is a graph which shows the relationship between the external temperature in the hot water supply system which concerns on Embodiment 1 of this invention, and bathroom preheating time.

Embodiment 1 FIG.
A hot water supply system according to Embodiment 1 of the present invention will be described. FIG. 1 is a schematic diagram showing an overall configuration of a hot water supply system according to the present embodiment. First, the configuration around the bathroom 200 that is a hot water supply target of the hot water supply system will be described. As shown in FIG. 1, a bath 200 and a mixing plug 5 are provided in a bathroom 200. Hot water from a hot water supply system is supplied to each of the bathtub 8 and the mixing tap 5. The dressing room 100 is provided adjacent to the bathroom 200.

  The hot water supply system includes a hot water storage unit 20, a heat pump heat source device 30, a dressing room heating device 40, a bathroom heating device 50, and a centralized remote controller 60. The hot water storage unit 20 and the heat pump heat source unit 30 constitute a hot water supply apparatus in the hot water supply system. The hot water storage unit 20 and the heat pump heat source unit 30 are connected via a water pipe. In addition, the hot water storage unit 20 and the bathtub 8 and the mixing plug 5 are connected via a water pipe. The heat pump heat source device 30 has a heat pump circuit in which the refrigerant circulates and a heat exchanger that heats water by heat radiation from the refrigerant. In the heat pump heat source device 30, hot water is boiled by heating water supplied from the hot water storage unit 20 side. The hot water boiled by the heat pump heat source device 30 is returned to the hot water storage unit 20. The hot water returned to the hot water storage unit 20 is stored in a hot water storage tank 1 described later, or directly supplied to a hot water supply target.

  The dressing room heating device 40 is a heating device that heats the dressing room 100. The bathroom heating device 50 is a heating device that heats the bathroom 200. As the heating device, only one of the dressing room heating device 40 or the bathroom heating device 50 may be provided. Electricity, gas, a heat pump, or the like can be used as the heat source of the heating device. As the air conditioning system of the heating device, warm air, heater radiation, a radiation panel, floor heating, or the like can be used. The central remote controller 60 includes an operation unit that receives various operations of the hot water supply device and the heating device by the user, and a display unit that displays information. The central remote controller 60 is provided in the dressing room 100.

  The hot water storage unit 20, the heat pump heat source device 30, the dressing room heating device 40, and the bathroom heating device 50 can be operated in conjunction with the operation of the central remote controller 60 by the user, the timer setting, or the remote operation from the information terminal as a trigger. It is configured. That is, in this hot water supply unit, hot water filling to the bathtub 8 and heating of the dressing room 100 and the bathroom 200 can be performed in synchronization. For this reason, the temperature of the dressing room 100 or the bathroom 200 can be raised while performing hot water filling to the bathtub 8. Thereby, when a user takes a bath, the temperature difference between the living room and the dressing room 100 or the bathroom 200 can be reduced. For example, when the temperature of a living room is 22 degreeC, the temperature of the dressing room 100 can be 20 degreeC. Therefore, the heat shock at the time of undressing in the dressing room 100 or bathing in the bathroom 200 can be suppressed. A heat shock is an effect that a human body is affected by a rapid temperature change. When a person moves from a warm room to a cold place, fainting, myocardial infarction, cerebral infarction, and the like may be caused by changes in blood pressure due to heat shock. Especially when taking a bath, the skin is exposed by undressing, so the effect of heat shock is likely to appear.

  The energy efficiency of the heat pump heat source device 30 varies depending on operating conditions such as hot water supply capacity and boiling temperature, and environmental conditions such as outside air temperature. The purpose of this embodiment is to optimize the hot water filling time and the energy efficiency of the heat pump heat source device 30 especially when hot water filling to the bathtub 8 is performed in conjunction with the heating of the dressing room 100 and the bathroom 200. It is said.

  FIG. 2 is a circuit diagram showing a configuration of a hot water supply apparatus provided in the hot water supply system according to the present embodiment. As shown in FIG. 2, the hot water supply apparatus has a temperature stratified hot water storage tank 1 for storing hot water. The hot water storage tank 1 is provided in the hot water storage unit 20. Low temperature water is stored in the lower part of the hot water storage tank 1, and high temperature water is stored in the upper part of the hot water storage tank 1. A plurality of temperature sensors 13 a to 13 f are provided on the outer wall surface of the hot water storage tank 1. The plurality of temperature sensors 13a to 13f are attached to different height positions so that the water temperatures at the plurality of water level levels of the hot water storage tank 1 can be detected. The hot water supply apparatus has water supply pipes 21, 21a, 21b, a first circulation circuit 31, hot water supply pipes 23, 24, 24a, 24b, and the like as hot water supply circuits for supplying hot water to a hot water supply target. In addition, the hot water supply apparatus has a second circulation circuit 32 and a reheating circuit 33 as a circuit for replenishing hot water in the bathtub 8.

  A water supply pipe 21 a for supplying water is connected to the bottom surface of the hot water storage tank 1. The water supply pipe 21a branches off from the water supply pipe 21 connected to the water supply source. A bottom surface portion of the hot water storage tank 1 and an upper surface portion of the hot water storage tank 1 are connected via a first circulation circuit 31. The first circulation circuit 31 is provided with a water pump 14a that sends low-temperature water at the lower part of the hot water storage tank 1 to the upper part of the hot water storage tank 1, and a heat pump heat source device 30 that heats the low-temperature water flowing through the first circulation circuit 31. ing.

  The upper surface portion of the hot water storage tank 1 and the lower portion of the side surface of the hot water storage tank 1 are connected via a second circulation circuit 32. The second circulation circuit 32 is provided with a heat exchanger 3 and a water pump 14b that sends high-temperature water in the upper part of the hot water storage tank 1 to the lower part of the hot water storage tank 1 through the heat exchanger 3. The second circulation circuit 32 shares the tank upper pipe 22 provided between the upper surface portion of the hot water storage tank 1 and the branch portion 26 with the first circulation circuit 31. The second circulation circuit 32 branches from the first circulation circuit 31 at the branching unit 26. The tank upper pipe 22 is connected to one inlet of the hot water mixing valve 2 having a three-way valve structure via a hot water supply pipe 23. A water supply pipe 21 b branched from the water supply pipe 21 is connected to the other inlet of the hot water supply mixing valve 2. A hot water supply pipe 24 is connected to the outlet of the hot water supply mixing valve 2. In the hot water supply mixing valve 2, the flow rate ratio between the flow rate flowing from one inlet to the outlet and the flow rate flowing from the other inlet to the outlet is adjusted. The hot water supply pipe 24 is provided with a temperature sensor 13g. The hot water supply pipe 24 is branched into a hot water supply pipe 24 a whose downstream end is connected to the mixing plug 5 and a hot water supply pipe 24 b whose downstream end is connected to the bathtub 8. A flow rate adjusting valve 7 is provided in the hot water supply pipe 24b. The flow rate adjusting valve 7 can be opened and closed and is configured to be capable of taking at least two stages of opening in the open state.

  A connecting portion 25 provided on the downstream side of the flow rate adjusting valve 7 in the hot water supply pipe 24b is connected to the bathtub 8 via a tracking circuit 33 provided separately from the hot water supply pipe 24b. The tracking circuit 33 is provided with a water pump 14c and a heat exchanger 3. The water pump 14c is configured to circulate the low-temperature water in the bathtub 8 through the tracking circuit 33 and the hot water supply pipe 24b. In the heat exchanger 3, heat exchange is performed between the low-temperature water flowing through the tracking circuit 33 and the high-temperature water flowing through the second circulation circuit 32. That is, when the water pump 14b and the water pump 14c are operated, the hot water in the bathtub 8 flows out to the reheating circuit 33, is heated by the heat exchanger 3, and is returned to the bathtub 8 through the hot water supply pipe 24b.

  The hot water storage unit 20 includes a controller 10 that controls the entire hot water storage unit 20 including the water pumps 14 a, 14 b, 14 c, the hot water supply mixing valve 2, and the flow rate adjustment valve 7. The control unit 10 has a microcomputer including a CPU, ROM, RAM, I / O port, and the like. The control unit 10 is communicably connected to the heat pump heat source device 30 and the central remote controller 60. The control unit 10 may be communicably connected to the dressing room heating device 40 and the bathroom heating device 50.

  Next, main operation modes of the hot water supply apparatus will be described. In general, in a hot water supply apparatus, boiling operation is performed at midnight, and hot water is stored in the hot water storage tank 1. Hot water is supplied using hot water stored in the hot water storage tank 1 during the daytime and at night.

(Boiling operation)
First, the boiling operation will be described. At the start of the boiling operation, hot water in the hot water storage tank 1 is consumed, and low temperature water close to the temperature of tap water is stored in the lower part of the hot water storage tank 1. When the boiling operation is started, the water pump 14a and the heat pump heat source unit 30 operate. The low-temperature water at the lower part of the hot water storage tank 1 flows through the first circulation circuit 31 and is heated by the heat pump heat source device 30 and returned to the upper part of the hot water storage tank 1 as high-temperature water. Thereby, high temperature water is stored in the upper part in the hot water storage tank 1, and laminating boiling in which low temperature water is stored in the lower part in the hot water storage tank 1 across the temperature boundary layer is performed. As the amount of boiling increases and the amount of hot water increases, the temperature boundary layer approaches the bottom surface of the hot water storage tank 1. Thereby, the incoming water temperature of the heat pump heat source machine 30 rises gradually.

As a characteristic of the heat pump heat source device 30, when the boiling temperature increases or the incoming water temperature increases, the COP representing the heating capacity per input deteriorates. This tendency is prominent when CO ₂ refrigerant operating in the supercritical region is used as the refrigerant in the heat pump circuit. For this reason, especially in the heat pump heat source apparatus 30 using the CO ₂ refrigerant, it is important to keep the boiling temperature and the incoming water temperature low in order to keep the energy efficiency high.

(Hot water operation)
Next, the hot water supply operation will be described. When hot water is used in the mixing tap 5 which is a hot water supply terminal, the hot water mixing valve 2 is configured so that the high temperature water at the top of the hot water storage tank 1 and the low temperature water from the water supply source have a set temperature of about 40 ° C., for example. Mixed. As a result, hot water having a set temperature is supplied to the mixing plug 5. When high temperature water flows out from the upper part of the hot water storage tank 1, low temperature water corresponding to the amount of the discharged water is replenished to the lower part of the hot water storage tank 1 by tap pressure, and the temperature boundary layer of the hot water storage tank 1 moves upward. At midnight, boiling operation is performed according to the amount of high-temperature water used. When the hot water in the hot water storage tank 1 decreases, the boiling operation is performed even in a time zone other than midnight.

(Heat pump direct hot water operation)
Next, the heat pump direct filling operation will be described. The hot water supply apparatus of the present embodiment can execute a heat pump direct hot water operation and a tank hot water operation to be described later as the hot water operation for performing hot water filling to the bathtub 8. The heat pump direct hot water filling operation is an operation in which hot water heated by the heat pump heat source device 30 is supplied to the bathtub 8 without going through the hot water storage tank 1 and the hot water filling to the bathtub 8 is performed. FIG. 3 is a diagram showing the flow of water in the heat pump direct hot water operation in the hot water supply apparatus provided in the hot water supply system according to the present embodiment.

  When the direct heat filling operation of the heat pump is started, the heat pump heat source unit 30 and the water pump 14a are activated. The hot water mixing valve 2 is set so that the flow rate ratio of hot water flowing in from the hot water supply pipe 23 side and flowing out to the hot water supply pipe 24 side becomes high. The flow regulating valve 7 is set to an open state with a relatively low opening. As a result, as shown in FIG. 3, tap water is supplied to the lower part of the hot water storage tank 1 via the water supply pipes 21 and 21a, and the low-temperature water at the lower part of the hot water storage tank 1 flows out into the first circulation circuit 31 and flows into the heat pump. Heated by the heat source device 30. The heated hot water is supplied to the bathtub 8 through the hot water supply pipe 23, the hot water supply mixing valve 2, the hot water supply pipes 24, 24 b and the flow rate adjustment valve 7. Thereby, hot water filling to the bathtub 8 is performed. The bathtub 8 is provided with a water level sensor (not shown). Hot water filling to the bathtub 8 is stopped when the set water level is reached. The driving force for circulating hot water in the direct hot water filling operation of the heat pump is the tap water pressure of makeup water supplied to the lower part of the hot water storage tank 1 via the water supply pipes 21 and 21a. The flow rate of the hot water supplied to the bathtub 8 is adjusted by the opening degree of the flow rate adjustment valve 7. By controlling the flow rate adjusting valve 7 so that the temperature measured by the temperature sensor 13g becomes a set temperature such as 40 ° C., hot water filling at a desired temperature becomes possible.

  In the example shown in FIG. 3, the hot water in the hot water storage tank 1 is not used for hot water filling, but the hot water in the hot water storage tank 1 can be used together by controlling the flow rate of the water pump 14a. When the rotation speed of the water pump 14a is relatively high and the flow rate of the first circulation circuit 31 is large, hot water filling using only hot water boiled by the heat pump heat source device 30 is performed. On the other hand, when the rotation speed of the water pump 14a is relatively low and the flow rate of the first circulation circuit 31 is small, the hot water boiled by the heat pump heat source unit 30 and the hot water in the hot water storage tank 1 are used in combination. Tensioning is performed. That is, in the heat pump direct hot water filling operation in the present embodiment, not only hot water filling operation using only hot water boiled by the heat pump heat source device 30 but also hot water boiled by the heat pump heat source device 30 and the hot water storage tank 1. The hot water operation using the high temperature water is also included.

  The tank upper pipe 22 may be provided with an open / close valve. Alternatively, the branch portion 26 may be provided with a three-way valve such as a mixing valve. When any of these valves is provided, the outflow of hot water from the hot water storage tank 1 can be blocked. For this reason, the supply amount of the hot water from the hot water storage tank 1 can be made zero, and the hot water filling using only the hot water boiled by the heat pump heat source device 30 can be performed. In this case, the boiling temperature of the heat pump heat source device 30 is adjusted by the opening degree of the flow rate adjustment valve 7.

  In the above boiling operation, it is necessary to operate the heat pump heat source unit 30 at a boiling temperature of 65 ° C. or higher for the purpose of reducing the heat storage volume and suppressing Legionella. On the other hand, in the heat pump direct hot water operation, the heat pump heat source device 30 can be operated at a boiling temperature of about 40 ° C., which is equal to the set temperature of the hot water. Therefore, in the heat pump direct hot water filling operation, since the heat pump heat source device 30 can be operated at a boiling temperature lower by 20 ° C. or more than the boiling operation, the hot water filling can be performed with greatly improved operation efficiency of the heat pump heat source device 30. Therefore, the energy saving property of the hot water supply system can be improved.

(Tank filling operation)
Next, the tank filling operation will be described. The tank hot water filling operation is an operation of performing hot water filling to the bathtub 8 using hot water stored in the hot water storage tank 1. FIG. 4 is a diagram illustrating a flow of water in a tank hot water filling operation in the hot water supply apparatus provided in the hot water supply system according to the present embodiment.

  When the tank hot water filling operation is started, the hot water mixing valve 2 is set so that the hot water flowing in from the hot water supply pipe 23 side and the tap water flowing in from the water supply pipe 21b side are mixed and flowed out. The hot water supply mixing valve 2 is controlled so that the temperature measured by the temperature sensor 13g becomes the set temperature. The flow rate adjusting valve 7 is set to an open state with a relatively high opening. As a result, as shown in FIG. 4, tap water is supplied to the lower part of the hot water storage tank 1 via the water supply pipes 21, 21 a, and the hot water in the upper part of the hot water storage tank 1 flows out into the upper tank pipe 22. The high-temperature water that has flowed into the tank upper pipe 22 flows into the hot water supply mixing valve 2 through the hot water supply pipe 23 and is mixed with tap water to become hot water having a set temperature. This hot water is supplied to the bathtub 8 via the hot water supply pipes 24, 24 b and the flow rate adjusting valve 7. Thereby, hot water filling to the bathtub 8 is performed. Hot water filling to the bathtub 8 is stopped when the set water level is reached.

  In the tank hot water filling operation, hot water filling to the bathtub 8 is performed by mixing hot water in the hot water storage tank 1 and low temperature tap water. The high temperature water in the hot water storage tank 1 is boiled to a high temperature of 65 ° C. or higher by the heat pump heat source device 30. For this reason, when the energy efficiency of the heat pump heat source unit 30 is compared, the tank filling operation is less efficient than the heat pump direct filling operation. Therefore, the power consumption required for the tank filling operation is larger than the power consumption required for the heat pump direct filling operation. That is, the tank filling operation is inferior in energy saving compared with the heat pump direct filling operation.

  However, in the tank hot water filling operation, since hot water already stored in the hot water storage tank 1 is used, hot water filling can be performed in a short time. On the other hand, in the case of the heat pump direct filling operation, the supply speed of the hot water to the bathtub 8 is limited by the heating capacity of the heat pump heat source unit 30. For this reason, the tank hot water operation is superior to the heat pump direct hot water operation in that the hot water supply speed to the bathtub 8 is high. Hereinafter, the hot water supply speed to the bathtub 8 may be referred to as a hot water filling speed or hot water flow rate to the bathtub 8.

  Next, energy saving hot water control in which the heat pump direct hot water operation and the tank hot water operation are combined will be described. FIG. 5 is a graph showing the concept of energy saving hot water control executed in the hot water supply system according to the present embodiment. The horizontal axis represents time, and the vertical axis represents energy efficiency. As shown in FIG. 5, the energy efficiency of the heat pump direct filling operation is higher than the energy efficiency of the tank filling operation. Further, the required time A for the entire hot water filling is the sum of the execution time B of the direct hot water filling operation of the heat pump and the execution time C of the tank hot water filling operation (A = B + C).

  When performing hot water filling to the bathtub 8 by combining the heat pump direct water filling operation and the tank hot water filling operation, the hot water filling can be performed with high energy efficiency by increasing the ratio of the heat pump direct water filling operation as much as possible. In this case, for example, it is desirable that the execution time B of the heat pump direct filling operation is longer than the execution time C of the tank filling operation (B> C). In addition, for example, it is desirable that the amount of hot water filling the bathtub 8 by direct hot water filling is larger than the amount of hot water filling the bathtub 8 by tank hot water operation.

  Thus, the energy efficiency of the heat pump direct filling operation is higher than the energy efficiency of the tank filling operation. However, the filling rate of the heat pump direct filling operation is slower than the filling rate of the tank filling operation. These points need to be taken into consideration when performing a combination of the heat pump direct filling operation and the tank filling operation.

  FIG. 6 is a flowchart showing an example of a control flow executed in the hot water supply system according to the present embodiment. The control shown in FIG. 6 is executed by the control unit 10 when a hot water filling start operation is performed by the user with the central remote controller 60 or when a hot water filling start time set in advance is reached. This control may be executed by a control unit built in the central remote controller 60.

  In step S1, the control unit 10 sets a hot water filling time. The hot water filling time is the time from the start of hot water filling to the completion of hot water filling. The hot water filling time may be set by the user, or may be set based on the preheating time of the dressing room heating device 40 or the preheating time of the bathroom heating device 50, as will be described later. Good.

  Next, in step S2, the control unit 10 determines the execution time of the heat pump direct hot water operation and the execution time of the tank hot water operation based on the set hot water time. The execution time of each operation is determined such that the execution time of the heat pump direct filling operation is as long as possible and the execution time of the tank filling operation is as short as possible. The execution time of the heat pump direct filling operation and the execution time of the tank filling operation are determined based on the following conditions, for example.

  The sum of the execution time of the heat pump direct filling operation and the execution time of the tank filling operation is equal to the set filling time. The sum of the amount of hot water filled by the direct hot water filling operation of the heat pump and the amount of hot water filled by the tank hot water filling operation becomes equal to the target amount of hot water filling to the bathtub 8. The target amount of hot water filling to the bathtub 8 is preset by the user.

  The amount of filling by heat pump direct filling operation is calculated based on the filling rate of the heat pump direct filling operation and the execution time of the heat pump direct filling operation. The hot water filling speed of the heat pump direct hot water filling operation is set in advance or is acquired by a learning operation using a detection value of a flow meter and a temperature sensor provided in the hot water filling route of the hot water supply apparatus.

  The amount of filling in the tank filling operation is calculated based on the filling rate of the tank filling operation and the execution time of the tank filling operation. The hot water filling speed of the tank hot water filling operation is set in advance or is acquired by a learning operation using a detection value of a flow meter and a temperature sensor provided in the hot water filling route of the hot water supply apparatus. Since the water pressure is the driving force in the tank hot water operation, the hot water speed of the tank hot water operation is the water pressure of the water supply pipe 21, the pipe length from the hot water storage tank 1 to the bathtub 8, and the hot water storage tank 1 and the bathtub 8 It depends on the installation conditions such as height difference. Further, the filling rate of the tank filling operation can be adjusted by the opening degree of the flow rate adjusting valve 7. The learning operation is performed when the opening degree of the flow rate adjusting valve 7 is the maximum opening degree. Thereby, the filling rate when the opening degree of the flow rate adjustment valve 7 is smaller than the maximum opening degree is calculated based on the opening degree of the flow rate adjustment valve 7. If necessary, it is also possible to adjust the opening degree of the flow rate adjusting valve 7 based on the detected value of the flow meter.

  Next, in step S3, the control unit 10 determines the execution order of the heat pump direct filling operation and the tank filling operation. Thereby, the switching time from one of the heat pump direct filling operation and the tank filling operation to the other is also determined.

  Next, in step S4, the control part 10 performs hot water filling based on the determined execution order and the execution time of each operation. Generally, since the capacity immediately after the heat pump heat source device 30 is started is unstable, the execution time of the heat pump direct filling operation and the amount of filling in the heat pump direct filling operation do not necessarily have a proportional relationship. On the other hand, the execution time of the tank filling operation and the amount of filling in the tank filling operation are generally proportional. Further, it is desirable that the number of switching between the heat pump direct filling operation and the tank filling operation is as small as possible. Therefore, at the beginning of the set filling time, the heat pump direct filling operation is performed for a long time as much as possible, then the heat pump direct filling operation is switched to the tank filling operation at the middle, and the tank filling operation is performed at the end of the filling time. It is desirable to do. By performing the tank filling operation last, fine adjustment of the filling time and the filling temperature can be performed. For example, during the execution of the heat pump direct hot water operation, based on information such as the amount of hot water in the bathtub 8, the hot water filling speed of the heat pump direct hot water operation, the hot water filling speed of the tank hot water operation, and the remaining time of the hot water filling time. It is possible to calculate a more appropriate switching time from the heat pump direct filling operation to the tank filling operation. That is, during the execution of the heat pump direct filling operation, the switching time from the heat pump direct filling operation to the tank filling operation can be changed from the switching time determined in step S3 to a more appropriate switching time. . The amount of hot water filling of the bathtub 8 during the execution of the direct hot water filling operation of the heat pump is obtained from the detection value of a flow meter and a temperature sensor provided in the hot water filling route. In addition, when the temperature of the hot water in the bathtub 8 is lower than the target temperature due to heat radiation during the execution of the direct hot water filling operation of the heat pump, the hot water supply temperature in the tank hot water filling operation is set to be higher, so that the bathtub 8 It is also possible to adjust the temperature of the hot water inside to an appropriate temperature.

  In addition to the above control, the following control can also be performed. For example, the control unit 10 may perform control to make the execution time of the heat pump direct filling operation longer than the execution time of the tank filling operation. In the heat pump direct hot water filling operation, since the hot water filling ability is limited to, for example, 4 to 6 kW which is the upper limit of the heating capacity of the heat pump heat source device 30, hot filling at a large flow rate is difficult. For this reason, it is possible to increase the amount of filling in the heat pump direct filling operation by increasing the execution time of the direct filling operation in the heat pump. Therefore, hot water filling can be performed with high energy efficiency. If the execution time of the heat pump direct filling operation becomes long, the heat pump direct filling operation may be performed after the tank filling operation.

  Moreover, the control part 10 may perform control which makes the amount of filling by heat pump direct filling operation larger than the amount of filling by tank filling operation. When the set hot water filling time is long, the degree of freedom of setting the ratio between the execution time of the heat pump direct hot water operation and the execution time of the tank hot water operation becomes high. For this reason, it is possible to lengthen the execution time of the heat pump direct filling operation. As a case where the hot water filling time is long, for example, the heat insulation performance of the house is low, and the bathroom preheating time described later may be long. In such a case, set the execution time of the direct filling operation of the heat pump as long as possible, and further reduce the filling rate during the filling operation of the tank as much as possible to increase the filling amount by direct filling operation of the heat pump. Can do. Therefore, hot water filling can be performed with high energy efficiency.

  Next, the case where hot water filling to the bathtub 8 and the operation of the dressing room heating device 40 and the bathroom heating device 50 are started simultaneously in synchronization will be described. Here, the heating start-up time until the temperature of the dressing room 100 reaches the set temperature after the operation of the dressing room heating device 40 is started may be referred to as a preliminary heating time of the dressing room heating device 40. In addition, the heating start-up time from when the operation of the bathroom heating device 50 is started until the temperature of the bathroom 200 reaches the set temperature may be referred to as a preliminary heating time of the bathroom heating device 50.

  When the hot water filling to the bathtub 8 and the operation of the dressing room heating device 40 and the bathroom heating device 50 are started simultaneously, the hot water filling time is the preheating time of the dressing room heating device 40 or the preheating time of the bathroom heating device 50. It is desirable to set the time equal to. This is because if either the hot water filling or the preheating is finished first, energy for heat retention is consumed excessively.

  FIG. 7 is a graph showing the relationship between the outside air temperature and the bathroom preheating time in the hot water supply system according to the present embodiment. The horizontal axis represents the outside air temperature, and the vertical axis represents the bathroom preheating time. In addition, although FIG. 7 illustrates the bathroom preheating time, the same applies to the dressing room preheating time. As shown in FIG. 7, the bathroom preheating time tends to increase as the outside air temperature decreases. Also, the bathroom preheating time varies depending on the heat insulation performance of the house. The bathroom preheating time becomes longer when the outside air temperature is low and when the heat insulation performance of the house is low. The bathroom preheating time is particularly long when the thermal insulation performance of the house is low and the heating capacity of the heating device is low.

  Since the heat insulation performance is a fixed value for each house where the hot water supply system is installed, the fluctuation factor is the outside air temperature. In the hot water supply system of the present embodiment, each time the controller 10 or the centralized remote controller 60 performs bathroom preheating by the bathroom heating device 50, the bathroom preheating time and the average outside air temperature during that time zone are stored. Thereby, the control unit 10 or the centralized remote controller 60 gradually learns the relationship between the outside air temperature and the bathroom preheating time, and the learning is completed when the winter period ends. For example, bathroom preheating time is learned as a function of outside air temperature. The relationship between the outside air temperature and the bathroom preheating time may be stored in the storage unit provided in the control unit 10 or the central remote controller 60, or may be stored in an external control device or storage device.

  When performing the control shown in FIG. 6, the bathroom preheating time or the dressing room preheating time is predicted based on the outside air temperature, and the predicted bathroom preheating time or the dressing room preheating time is set as the hot water filling time. It is desirable. Then, the execution time of the heat pump direct filling operation is estimated, the heat pump direct filling operation is executed first, and the tank filling operation is executed at the end of the filling time. During the tank filling operation, the filling end time is finely adjusted by adjusting the filling speed. Thereby, the hot water filling to the bathtub 8 and the preliminary heating of at least one of the dressing room 100 and the bathroom 200 are completed simultaneously. Thereby, it can prevent consuming the energy for heat retention extra, and can improve the energy-saving property of a hot water supply system.

  Note that the user can set whether or not the hot water filling and the preheating are synchronized using the central remote controller 60. For example, a user who wants to give priority to hot water filling in a short time over preheating uses the central remote controller 60 to set so that the hot water filling and the preheating are not synchronized. Thereby, normal hot water filling becomes possible. Control that synchronizes hot water filling and preheating is effective when there is a time allowance until bathing and when the start time can be set by a timer. By allowing the user to set whether to synchronize hot water filling and preheating, it is possible to achieve both energy saving and convenience of the hot water supply system.

  Synchronized state of hot water filling and bathroom preheating and dressing room preheating, hot water filling situation in bathtub 8, remaining time until completion of hot water filling in bathtub 8, remaining time until completion of bathroom preheating, or dressing room spare The remaining time until the completion of heating is displayed on a display unit provided in the central remote controller 60. Thereby, since a user can perform bathing systematically, the convenience of a hot water supply system improves.

  As described above, the hot water supply system according to the present embodiment includes the heat pump heat source device 30 that heats water, the hot water storage tank 1 that stores at least a portion of hot water heated by the heat pump heat source device 30, and the hot water storage tank 1. Tank hot water filling operation in which hot water stored in the tank 8 is filled with hot water, and hot water heated by the heat pump heat source device 30 is supplied to the bathtub 8 without passing through the hot water storage tank 1 to supply hot water to the bathtub 8. A hot water supply circuit configured to perform a heat pump direct hot water filling operation for performing the tension, and a control unit 10 for controlling the heat pump heat source device 30 and the hot water supply circuit are provided. Here, the tank filling operation is an example of the first filling operation. The heat pump direct filling operation is an example of the second filling operation. The control unit 10 is configured to execute a combination of the tank filling operation and the heat pump direct filling operation based on the set filling time.

  According to this configuration, the tank filling operation with low energy efficiency and high filling rate and the heat pump direct filling operation with high energy efficiency and slow filling rate are combined based on the filling time. For this reason, the ratio of the heat pump direct filling operation can be made as high as possible within the set filling time. Therefore, it is possible to increase the energy efficiency of the hot water filling while preventing the hot water filling time from becoming long. Therefore, according to this Embodiment, hot water filling time and energy efficiency can be optimized.

  Moreover, in the hot water supply system according to the present embodiment, the control unit 10 is configured to execute the tank filling operation at the end of the filling time. While the heat pump direct filling time and the amount of heat pump filling are not always proportional, the tank filling time and the amount of filling are generally proportional. become. Therefore, by executing the tank filling operation at the end of the filling time, the filling time can be easily predicted and the filling end time can be finely adjusted.

  Further, in the hot water supply system according to the present embodiment, the control unit 10 performs the tank hot water operation and the heat pump direct hot water so that the execution time B of the heat pump direct hot water operation is longer than the execution time C of the tank hot water operation. It is configured to perform a tension operation. According to this configuration, the energy efficiency of the hot water filling can be further increased.

  Moreover, the hot water supply system according to the present embodiment further includes a bathroom heating device 50 or a dressing room heating device 40 as a heating device for heating the bathroom 200 in which the bathtub 8 is installed or the dressing room 100 adjacent to the bathroom 200. ing. According to this structure, since the temperature difference between the living room and the bathroom 200 or the dressing room 100 can be reduced, heat shock can be suppressed.

  Moreover, in the hot water supply system according to the present embodiment, the control unit 10 is configured to synchronize the hot water filling to the bathtub 8 and the operation of the bathroom heater 50 or the dressing room heater 40. Moreover, the control part 10 sets the heating start-up time after the driving | operation of the bathroom heating apparatus 50 or the dressing room heating apparatus 40 is started until the temperature of the bathroom 200 or the dressing room 100 reaches setting temperature as a hot water filling time. It is configured as follows. The heating start-up time of the bathroom heating device 50 or the dressing room heating device 40 may be longer than the time required for hot water filling depending on conditions such as the heat insulation performance around the bathroom, the outside air temperature, and the heating capacity. If the hot water filling is completed before the temperature of the bathroom 200 or the dressing room 100 reaches the set temperature, the heat of the bath 8 or the dressing room 100 is dissipated from the hot water of the bathtub 8 until the temperature reaches the set temperature. Will be wasted. In particular, in a house with low thermal insulation performance, energy is wasted. On the other hand, according to the said structure, since hot water filling time can be made to correspond with heating start-up time, the energy saving property of a hot water supply system can be improved. In addition, by matching the hot water filling time with the heating start-up time, a long hot water filling time can be ensured, so that the ratio of the heat pump direct hot water filling operation can be further increased. Therefore, the energy efficiency of hot water filling can be further increased.

  Moreover, in the hot water supply system according to the present embodiment, the control unit 10 is configured to learn the heating start-up time as a function of the outside air temperature. According to this structure, the heating start-up time of the bathroom heater 50 or the dressing room heater 40 can be predicted more accurately.

  Moreover, the hot water supply system according to the present embodiment further includes a centralized remote controller 60 that accepts a setting operation as to whether or not the hot water filling to the bathtub 8 and the operation of the bathroom heating device 50 or the dressing room heating device 40 are performed in synchronization. I have. Here, the central remote controller 60 is an example of an operation unit. According to this configuration, when priority is given to the hot water filling of the bathtub 8 over the heating of the bathroom 200 or the dressing room 100, the hot water filling of the bathtub 8 and the operation of the bathroom heating device 50 or the dressing room heating device 40 are synchronized. Can be set by the user to prevent Therefore, it is possible to achieve both energy saving and convenience of the hot water supply system.

  In addition, the hot water supply system according to the present embodiment is a synchronized state between the hot water filling to the bathtub 8 and the operation of the bathroom heating device 50 or the dressing room heating device 40, the hot water filling situation to the bathtub 8, or the hot water to the bathtub 8. A display unit for displaying the remaining time until the completion of tensioning is further provided. According to this configuration, since the user can perform planned bathing, the convenience of the hot water supply system is improved.

  DESCRIPTION OF SYMBOLS 1 Hot water storage tank, 2 Hot-water supply mixing valve, 3 Heat exchanger, 5 Mixing plug, 7 Flow control valve, 8 Bathtub, 10 Control part, 13a, 13b, 13c, 13d, 13e, 13f, 13g Temperature sensor, 14a, 14b, 14c water pump, 20 hot water storage unit, 21, 21a, 21b water supply pipe, 22 tank upper pipe, 23, 24, 24a, 24b hot water supply pipe, 25 connection part, 26 branch part, 30 heat pump heat source machine, 31 first circulation circuit, 32 second circulation circuit, 33 chasing circuit, 40 dressing room heating device, 50 bathroom heating device, 60 centralized remote control, 100 dressing room, 200 bathroom.

Claims (8)

A heat pump heat source machine for heating water;
A hot water storage tank for storing at least a part of hot water heated by the heat pump heat source device;
A first hot water filling operation in which hot water stored in the hot water storage tank is used to fill the bathtub, and hot water heated by the heat pump heat source is supplied to the bathtub without passing through the hot water storage tank. A second hot water filling operation for performing hot water filling, and a hot water supply circuit configured to be executable.
A control unit for controlling the heat pump heat source unit and the hot water supply circuit;
With
The hot water supply system configured to execute the first hot water filling operation and the second hot water filling operation based on a set hot water filling time.   The hot water supply system according to claim 1, wherein the control unit is configured to execute the first hot water filling operation at the end of the hot water filling time.   The control unit is configured to execute the first hot water filling operation and the second hot water filling operation so that an execution time of the second hot water filling operation is longer than an execution time of the first hot water filling operation. The hot water supply system according to claim 1 or claim 2. A heating device for heating a bathroom in which the bathtub is installed or a dressing room adjacent to the bathroom;
The hot water supply system according to any one of claims 1 to 3, wherein the control unit is configured to perform hot water filling on the bathtub and the operation of the heating device in synchronization.   The said control part is comprised so that the heating start-up time until the temperature of the said bathroom or the said dressing room may reach setting temperature after the driving | operation of the said heating apparatus is started is set as the said hot water filling time. 4. A hot water supply system according to 4.   The hot water supply system according to claim 5, wherein the control unit is configured to learn the heating start-up time as a function of outside air temperature.   The hot water supply system according to any one of claims 4 to 6, further comprising an operation unit that receives a setting operation for determining whether or not to perform hot water filling to the bathtub and the operation of the heating device in synchronization.   The display part which displays the remaining time until the hot water filling to the said bathtub, the state of hot water filling to the said bathtub, or the hot water filling situation to the said bathtub is further provided. Item 8. The hot water supply system according to any one of Items 7.

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