JP2013079760A - Heat pump type liquid supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a temperature of liquid which is a heating target reach a target value related to a boiling temperature promptly after start of a boiling operation.SOLUTION: This heat pump type water heater 11A cooperatively drives a heat pump cycle 14 and a hot water storage cycle 16, boils low-temperature water to store hot water achieving the target value related to the boiling temperature in a hot water storage tank, and supplies the hot water to each place when needed. When a temperature of the hot water detected by an after-heating temperature sensor 45 after the raw water is heated does not reach the target value related to the boiling temperature, a heat pump control part 47A performs the boiling operation for boiling the raw water while controlling rotating speed of a drive motor related to a compressor 19 and rotating speed of a drive motor related to a circulation pump 33 so that the temperature of the raw water heated corresponds to the target value related to the boiling temperature.

Description

  The present invention relates to, for example, a technique for cooperatively driving a heat pump cycle and a hot water storage cycle, boiling low-temperature water, storing hot water having a target value related to the boiling temperature in a hot water storage tank, and supplying the hot water to various places as needed.

  As part of energy conservation measures, for example, the heat pump cycle and hot water storage cycle are cooperatively driven using late-night electricity, the low temperature water is boiled and the hot water of the target value related to the boiling temperature is stored in the hot water storage tank, and it is stored in various places as necessary. Heat pump type hot water heaters to be supplied are widespread. In such a heat pump type water heater, heat exchange is performed between the high-temperature and high-pressure gas refrigerant compressed by the compressor of the heat pump cycle and the low-temperature water taken out from the bottom of the hot water storage tank of the hot water storage cycle. The hot water boiled by this heat exchange is returned to the top of the hot water storage tank. By repeating such boiling (hereinafter, “boiling” may be abbreviated as “boiling”), hot water having a target value related to the boiling temperature is stored in the hot water storage tank.

  In such a heat pump type water heater, in order to store hot water having a target value related to the boiling temperature in the hot water storage tank, it is required to make the heating capacity of the heat exchanger follow the target value. As one approach to responding to such a request, the applicant of the present application is that the gas discharged from the compressor based on the target values for the outside air temperature, the raw water temperature flowing into the heat exchanger, and the boiling temperature. Boiling that determines the target value of the refrigerant temperature, detects the compressor casing temperature with a temperature sensor, and controls the opening of the pressure reducing valve so that the detected value of the compressor casing temperature matches the target value of the gas refrigerant temperature A control technique is proposed (see Patent Document 1). According to the boiling-up control technique according to Patent Document 1, the heating capacity of the heat exchanger can follow the target value.

JP 2007-327727 A

  However, in the boiling control technique according to Patent Document 1, from the start of the heating operation to the heating capacity of the heat exchanger, the heating capacity of the heat exchanger can be made to follow the target value promptly from the start of the boiling operation. It takes a certain amount of time. For this reason, there was a problem that lukewarm water (hot water with insufficient heating) before reaching the target value related to the boiling temperature is returned to the hot water storage tank until a predetermined time elapses.

  The present invention has been made to solve the above-described problems of the prior art, so that the temperature of the liquid to be heated reaches the target value related to the boiling temperature promptly from the beginning of the boiling operation. The purpose is to do.

  A heat pump type liquid supply device according to the present invention includes a compressor that compresses and discharges a refrigerant, a liquid / refrigerant heat exchanger that heats a liquid to be heated by heat exchange with the refrigerant discharged from the compressor, A pressure adjusting unit that adjusts the pressure of the refrigerant condensed in the liquid / refrigerant heat exchanger; and an evaporator that exchanges heat between the refrigerant decompressed by the pressure adjusting unit and air and returns the refrigerant to the compressor. A heat pump cycle in which each of the compressor, the liquid / refrigerant heat exchanger, the pressure adjusting unit, and the evaporator is connected via a refrigerant distribution pipe, and a tank in which the liquid is stored, And an outward piping that includes the liquid / refrigerant heat exchanger and takes out the liquid from the tank and sends it to the liquid / refrigerant heat exchanger between the tank and the liquid / refrigerant heat exchanger, and A liquid storage cycle in which the liquid heated by the liquid / refrigerant heat exchanger is connected to the tank via a return pipe, and the liquid in the tank is connected to the forward pipe, the liquid / refrigerant heat exchange. And a circulation pump that circulates through each of the return pipes, a post-heating temperature detection unit that detects a post-heating temperature of the liquid after being heated by the liquid / refrigerant heat exchanger, and a post-heating temperature detection unit When the temperature after heating of the liquid detected in (1) does not reach a target value related to a predetermined boiling temperature, so that the temperature after heating of the liquid matches the target value related to the boiling temperature, And a heat pump control unit that performs a boiling operation for boiling the liquid while adjusting the circulation flow rate of the refrigerant and the circulation flow rate of the liquid.

  According to the present invention, the temperature of the liquid to be heated can be made to reach the target value related to the boiling temperature promptly from the beginning of the boiling operation.

It is a system configuration | structure figure of the heat pump type liquid supply apparatus which concerns on 1st Embodiment of this invention. It is a flowchart showing the flow of the process at the time of making the heat pump type liquid supply apparatus which concerns on 1st Embodiment of this invention perform a boiling operation. It is a graph showing the time-dependent change of the temperature after a heating at the time of making the heat pump type liquid supply apparatus which concerns on 1st Embodiment of this invention perform a boiling operation. It is a graph showing the time-dependent change of the circulation flow rate when making the heat pump type liquid supply apparatus which concerns on 1st Embodiment of this invention perform a boiling operation. It is a system configuration | structure figure of the heat pump type liquid supply apparatus which concerns on 2nd Embodiment of this invention. It is a flowchart showing the flow of a process at the time of making a heat pump type liquid supply apparatus which concerns on 2nd Embodiment of this invention perform a boiling operation.

  Hereinafter, heat pump type liquid supply devices according to a plurality of embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
(System configuration of the heat pump type liquid supply device according to the first embodiment of the present invention)
FIG. 1 is a system configuration diagram of the heat pump type liquid supply apparatus according to the first embodiment of the present invention. Below, about the heat pump type liquid supply apparatus which concerns on 1st Embodiment of this invention, as shown in FIG. 1, the heat pump cycle 14 and the hot water storage cycle 16 are driven cooperatively, the target which concerns on boiling temperature by boiling low-temperature water A heat pump type hot water heater 11A that stores hot water of a value in the hot water storage tank 31 and supplies it to various places in the hot water supply system will be described as an example.

  As shown in FIG. 1, the heat pump type hot water heater 11 </ b> A is configured by connecting the heat pump unit 13 and the hot water storage unit 15 in communication with each other via the forward piping 17 a and the backward piping 17 b at the construction site of the hot water heater 11. Is done.

  As shown in FIG. 1, the heat pump unit 13 includes a compressor 19, a water / refrigerant heat exchanger (corresponding to the “liquid / refrigerant heat exchanger” of the present invention) 21, an electric pressure reducing valve 23, and The heat pump cycle 14 which connected the evaporator 25 cyclically | annularly via the refrigerant | coolant piping 22 used as the flow path of enclosed refrigerant | coolant (for example, carbon dioxide), the circulation pump 33, and the heat pump control part 47A are provided.

  The compressor 19 has a function of compressing and discharging the refrigerant by rotationally driving a compression mechanism (not shown) using a drive motor (not shown). The high-temperature and high-pressure compressed refrigerant compressed by the compressor 19 is discharged to the water / refrigerant heat exchanger 21 through the refrigerant pipe 22. The water / refrigerant heat exchanger 21 includes a refrigerant-side heat transfer tube 21a through which the high-temperature and high-pressure compressed refrigerant discharged from the compressor 19 flows, and water sent from the hot water storage tank 31 (the “liquid” of the present invention). Is provided with a water-side heat transfer tube 21b. The water / refrigerant heat exchanger 21 has a function of boiling water by heat exchange with a high-temperature / high-pressure compressed refrigerant.

A pressure reducing valve (corresponding to the “pressure adjusting unit” of the present invention) 23 through which the refrigerant condensed in the water / refrigerant heat exchanger 21 circulates depressurizes the medium / high pressure refrigerant and is easily evaporated. The refrigerant is sent to the evaporator 25. The pressure reducing valve 23 adjusts the opening degree of the refrigerant flow passage (adjusts the pressure of the refrigerant flowing through the refrigerant pipe 22), thereby adjusting the refrigerant circulation amount in the heat pump cycle 14 and the opening degree. By increasing the size, it has a function of sending a large amount of medium-temperature / low-pressure refrigerant to the evaporator 25 to melt frost.
As the “pressure adjusting unit” of the present invention, a capillary tube may be used instead of or in addition to the pressure reducing valve 23.

  The evaporator 25 has a function of evaporating the low-temperature and low-pressure refrigerant decompressed (expanded) by the pressure reducing valve 23 and returning it to the compressor 19. Specifically, the evaporator 25 has a function of taking outside air by the blower fan 27 rotating by the operation of the fan motor 27a, exchanging heat between the air and the refrigerant, and absorbing heat from the outside air.

  On the other hand, as shown in FIG. 1, the hot water storage unit 15 includes a hot water storage tank (corresponding to a “tank” of the present invention) 31 and a hot water storage unit control unit 39. The hot water storage tank 31 includes tap water (corresponding to the “liquid to be heated” of the present invention) supplied from a water supply source via a water supply pipe 35 and hot water supplied to a hot water supply system via a hot water supply pipe 37. It has a function to store and. The circulation pump 33 functions to suck low temperature water from the bottom of the hot water storage tank 31 and return the heated hot water to the top of the hot water storage tank 31 by discharging the sucked low temperature water to the water / refrigerant heat exchanger 21.

  The hot water storage tank 31, the circulation pump 33, and the water / refrigerant heat exchanger 21 are connected to each other in an annular manner through the forward piping 17 a and the return piping 17 b serving as hot water flow passages, respectively. This corresponds to the “liquid storage cycle” of the invention.) 16 is formed.

  As shown in FIG. 1, the compressor 19 is provided with a discharge refrigerant temperature sensor (corresponding to the “discharge refrigerant temperature detection unit” of the present invention) 18 that detects the temperature of the high-temperature and high-pressure compressed refrigerant. . The high-temperature and high-pressure compressed refrigerant is discharged through a refrigerant discharge port (not shown) of the compressor 19. For this reason, the temperature near the refrigerant outlet in the casing (not shown) of the compressor 19 has a strong correlation with the temperature of the high-temperature / high-pressure compressed refrigerant. Therefore, the temperature near the refrigerant discharge port in the casing of the compressor 19 is set to the temperature of the refrigerant discharged from the refrigerant discharge port by the discharge refrigerant temperature sensor 18 provided in the vicinity of the refrigerant discharge port in the casing of the compressor 19. Detect as. However, in addition to the detection means described above, if there is a means for accurately detecting the temperature of the compressed refrigerant discharged from the compressor 19, it may be adopted.

  The compressor 19 is provided with a compressed refrigerant pressure sensor 20 that detects the pressure of the refrigerant discharged from the refrigerant discharge port. Further, the compressor 19 is provided with a rotation speed detector (not shown) that detects the rotation speed of the drive motor related to the compression mechanism. The refrigerant pipe 22 located downstream of the water / refrigerant heat exchanger 21 is provided with a water / refrigerant heat exchanger outlet side refrigerant temperature sensor 41.

  In the vicinity of the evaporator 25, an outside air temperature sensor (corresponding to the “outside air temperature detector” of the present invention) 42 for detecting the outside air temperature is provided. The outgoing pipe 17a located upstream of the water / refrigerant heat exchanger 21 is provided with a raw water temperature sensor that detects the temperature of the raw water before boiling that flows into the water / refrigerant heat exchanger 21 (“raw solution temperature detection” of the present invention). 43 ”). 43 is provided. The return pipe 17b located downstream of the water / refrigerant heat exchanger 21 is provided with a post-heating temperature sensor that detects the temperature of the boiling water flowing out of the water / refrigerant heat exchanger 21 (“ 45 is provided. Detection values of these temperature sensors (discharge refrigerant temperature sensor 18, water / refrigerant heat exchanger outlet side refrigerant temperature sensor 41, outside air temperature sensor 42, raw water temperature sensor 43, and post-heating temperature sensor 45), and compression The detection value of the refrigerant pressure sensor 20 is given to the heat pump control unit 47A.

  In addition, as shown in FIG. 1, hot water storage sensors 31 a to 31 e for detecting the hot water storage temperature and the amount of hot water stored in the hot water storage tank 31 are provided inside the hot water storage tank 31. The detection values of the hot water storage sensors 31 a to 31 e are given to the hot water storage unit control unit 39.

  The hot water storage unit control unit 39 and the heat pump control unit 47A include, for example, a microcomputer (not shown) including a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like (hereinafter referred to as “microcomputer”). Omitted). The microcomputer reads and executes a program stored in the ROM, and operates to perform various controls including a boiling operation described below.

  The heat pump control unit 47A and the hot water storage unit control unit 39 operate in cooperation with each other, thereby controlling the operation / stop of the heat pump cycle 14, the capacity control of the compressor 19, and the rotational speed control of the drive motor related to the compressor 19, It controls and controls the opening of the pressure reducing valve 23, the rotational speed control of the fan motor 27a, the operation / stop control of the hot water storage cycle 16, the rotational speed control of the drive motor related to the circulation pump 33, and the like. Thereby, the heat pump control unit 47A and the hot water storage unit control unit 39 are configured to appropriately perform the boiling operation, the defrosting operation, the hot water supply operation, and the like.

(Operation of the heat pump type water heater 11A according to the first embodiment of the present invention)
Next, the flow of processing when the heat pump type hot water heater 11A according to the first embodiment of the present invention performs a boiling operation will be described with reference to FIGS. FIG. 2 is a flowchart showing the flow of processing when the heat pump type liquid supply apparatus according to the first embodiment of the present invention performs a boiling operation. FIG. 3 is a graph showing a change over time in the temperature after heating when causing the heat pump type liquid supply apparatus according to the first embodiment of the present invention to perform a boiling operation. FIG. 4 is a graph showing a change over time in the circulation flow rate when the heat pump type liquid supply apparatus according to the first embodiment of the present invention performs a boiling operation.
The processing flow shown in FIG. 2 is started at the timing when the heat pump control unit 47A issues a boiling operation start command.

  Here, the boiling operation in which the set amount of hot water boiled until the raw water reaches the boiling temperature target value is stored in the hot water storage tank 31 is a midnight time zone where the electricity rate is low (for example, 11 pm to 7 am ). This is because it is preferable from the viewpoint of effective utilization of power resources and economic efficiency. Also, the boiling operation time zone is shifted to the latter half of the midnight time zone, which is close to the actual usage time zone. The purpose is to reduce heat dissipation loss.

  In setting the performance time zone of the boiling operation, the hot water storage unit control unit 39 first, for example, the capacity of the hot water storage tank 31 (hot water storage amount) obtained from the hot water storage sensors 31a to 31e, the raw water temperature (temperature before heating), The required boiling heat amount is calculated based on the post-heating temperature, and the required boiling time is calculated based on the required boiling heat amount and the heating capacity of the water / refrigerant heat exchanger 21. Then, the hot water storage unit control unit 39 sets a time obtained by subtracting the required boiling time from the end time of the midnight time zone (7 am in the above example) as the boiling operation start time. The hot water storage unit control unit 39 issues a boiling operation start command to the heat pump control unit 47A at the timing of the boiling operation start time thus set.

In step S <b> 11, the heat pump control unit 47 </ b> A performs control to start the compressor 19, the pressure reducing valve 23, and the circulation pump 33 with initial values. Thereby, the drive motor which concerns on the compressor 19 drives with the rotational speed set as an initial value. The pressure reducing valve 23 opens a valve body (not shown) at an opening set as an initial value. The drive motor related to the circulation pump 33 is driven at a rotation speed set as an initial value.
The heat pump control unit 47A controls the drive motor related to the circulation pump 33 to operate while maintaining the rotation speed set as the initial value until the circulating water flow rate is stabilized.

  In step S <b> 12, the heat pump control unit 47 </ b> A acquires the outside air temperature detected by the outside air temperature sensor 42 and the raw water temperature detected by the raw water temperature sensor 43.

  In step S13A, the heat pump control unit 47A sets the target value related to the boiling temperature and the target value related to the discharge refrigerant pressure based on the outside air temperature and the raw water temperature acquired in step S12.

  In step S14, the heat pump control unit 47A performs the required heating for the water / refrigerant heat exchanger 21 based on the outside air temperature and raw water temperature acquired in step S12, and the target value related to the boiling temperature set in step S13A. A reference value related to the rotational speed of the drive motor related to the compressor 19 for realizing the capacity is calculated.

  In step S <b> 15 </ b> A, the heat pump control unit 47 </ b> A acquires the discharge refrigerant pressure from the compressor 19 detected by the compressed refrigerant pressure sensor 20.

  In step S16A, the heat pump control unit 47A determines whether or not the discharge refrigerant pressure acquired in step S15A matches the target value related to the discharge refrigerant pressure set in step S13A. As a result of the determination in step S16A, when it is determined that the discharge refrigerant pressure does not match the target value related to the discharge refrigerant pressure, the heat pump control unit 47A advances the process flow to step S17, while the discharge refrigerant pressure If it is determined that the pressure matches the target value related to the discharged refrigerant pressure, the process flow is directly advanced to step S18.

  In step S <b> 17, the heat pump control unit 47 </ b> A performs control to adjust the opening degree of the valve body related to the pressure reducing valve 23 so that the discharged refrigerant pressure matches the target value related to the discharged refrigerant pressure. Specifically, when the discharge refrigerant pressure is lower than the target value related to the discharge refrigerant pressure, the heat pump control unit 47A performs control to adjust the valve body related to the pressure reducing valve 23 to be closed (closed). When the refrigerant pressure is higher than the target value related to the discharged refrigerant pressure, control is performed to adjust the valve body related to the pressure reducing valve 23 to open. The adjustment of the refrigerant pressure may be performed with reference to a predetermined adjustment allowance (for example, 0.2 MPa adjustment for each adjustment or 5 pulses driving for each adjustment). You may carry out using the pressure value calculated aiming at discharge refrigerant pressure being in agreement with the target value concerning discharge refrigerant pressure. Thereafter, the heat pump control unit 47A advances the process flow to the next step S18.

  In step S <b> 18, the heat pump control unit 47 </ b> A acquires the post-heating temperature of the raw water detected by the post-heating temperature sensor 45.

  In step S19, the heat pump control unit 47A determines whether or not the temperature after heating of the raw water acquired in step S18 matches the target value related to the boiling temperature set in step S13A. As a result of the determination in step S19, when it is determined that the temperature after heating of the raw water does not match the target value related to the boiling temperature, the heat pump control unit 47A advances the process flow to step S20, If it is determined that the temperature of the raw water after heating matches the target value related to the boiling temperature, the process flow is directly advanced to step S21.

  In step S <b> 20, the heat pump control unit 47 </ b> A performs control to adjust the rotation speed of the drive motor related to the compressor 19 so that the heated temperature of the raw water matches the target value related to the boiling temperature. Specifically, the heat pump control unit 47A performs control to adjust the rotational speed of the drive motor related to the compressor 19 to increase when the temperature after heating of the raw water is lower than the target value related to the boiling temperature. When the temperature after heating the raw water is higher than the target value related to the boiling temperature, control is performed to adjust the rotational speed of the drive motor related to the compressor 19 to be reduced. The rotational speed of the drive motor according to the compressor 19 may be adjusted with reference to a predetermined adjustment fee (for example, 10 rpm (revolution per minute) for each adjustment), or after heating the raw water. You may perform using the rotational speed value calculated aiming that temperature corresponds with the target value which concerns on boiling temperature.

In addition, immediately after the start of the boiling operation, since the desired heating capacity cannot be output due to the delay in the rise of the heating capacity related to the heat pump cycle, the temperature after heating of the raw water is usually equal to the target value related to the boiling temperature. Low compared. Then, immediately after the start of the boiling operation, the heat pump control unit 47A generally performs control to adjust the rotational speed of the drive motor related to the compressor 19 to increase. By this control, the circulation flow rate, temperature, and pressure of the compressed refrigerant discharged from the compressor 19 become higher than before the adjustment. As a result, the heating capacity of the water / refrigerant heat exchanger 21 is also higher than before the adjustment, so that the temperature after heating can be increased.
After adjusting the rotational speed of the drive motor related to the compressor 19 in step S20, the heat pump control unit 47A advances the process flow to the next step S21.

  In step S21, as in step S19, the heat pump control unit 47A determines whether the temperature after heating of the raw water acquired in step S18 matches the target value related to the boiling temperature set in step S13A. As a result of the determination in step S21, the heat pump control unit 47A advances the process flow to step S22 when it is determined that the temperature after heating of the raw water is lower than the target value related to the boiling temperature. When it is determined that the temperature after heating the raw water is equal to or higher than the target value related to the boiling temperature, the process flow is directly advanced to step S23.

  In step S <b> 22, the heat pump control unit 47 </ b> A performs control to adjust the rotation speed of the drive motor related to the circulation pump 33 so that the heated temperature of the raw water matches the target value related to the boiling temperature. Specifically, for example, when the temperature after heating of the raw water is lower than the target value related to the boiling temperature, the heat pump control unit 47A performs control to adjust the rotational speed of the drive motor related to the circulation pump 33 to be reduced. Do. The rotation speed adjustment of the drive motor related to the circulation pump 33 may be performed with reference to a predetermined adjustment allowance (for example, 10 rpm (revolution per minute) for each adjustment), or after heating the raw water You may perform using the rotational speed value calculated aiming that temperature corresponds with the target value which concerns on boiling temperature.

In addition, immediately after the start of the boiling operation, since the desired heating capacity cannot be output due to the delay in the rise of the heating capacity related to the heat pump cycle, the temperature after heating of the raw water is usually equal to the target value related to the boiling temperature. Low compared. Then, immediately after the start of the boiling operation, the heat pump control unit 47 </ b> A generally performs control to adjust so as to reduce the rotation speed of the drive motor related to the circulation pump 33. By this control, the amount of hot water circulating in the hot water storage cycle 16 becomes smaller than before the adjustment. As a result, by reducing the circulation flow rate of the raw water to be heated, the heating capacity necessary to reach the target value related to the boiling temperature after heating the raw water can be reduced. The temperature can be increased after heating the raw water.
After adjusting the rotational speed of the drive motor related to the circulation pump 33 in step S22, the heat pump control unit 47A returns the process flow to step S12 and causes the following processes to be performed.

  In step S23, the heat pump control unit 47A determines whether or not the compressor motor rotation speed acquired by the compressor motor rotation speed detection unit of the compressor 19 matches the reference value related to the compressor motor rotation speed calculated in step S14. Determine whether. As a result of the determination in step S23, when it is determined that the compressor motor rotation speed does not match the reference value related to the compressor motor rotation speed, the heat pump control unit 47A advances the process flow to step S24. On the other hand, if it is determined that the compressor motor rotation speed matches the reference value related to the compressor motor rotation speed, the flow of processing proceeds directly to step S25.

In step S24, the heat pump control unit 47A performs control to adjust the rotation speed of the drive motor related to the circulation pump 33 so that the compressor motor rotation speed matches the reference value related to the compressor motor rotation speed.
“The compressor motor rotational speed matches the reference value related to the compressor motor rotational speed” means “the heating capacity of the liquid / refrigerant heat exchanger 21 matches the predetermined target value of the heating capacity”. "Means.

Specifically, when the compressor motor rotation speed is low compared to the reference value related to the compressor motor rotation speed, in other words, the heat pump control unit 47A sends the water / refrigerant heat exchanger 21 to the water / refrigerant heat exchanger 21. When the heating capacity is low compared to the reference value, control is performed to increase the rotational speed of the drive motor related to the circulation pump 33, while when the compressor motor rotational speed is high compared to the reference value, the circulation is performed. Control to adjust the rotational speed of the drive motor related to the pump 33 to be reduced is performed. Thereby, the heating capability at the time of boiling operation can be made to correspond with the target value of the predetermined heating capability.
After adjusting the rotational speed of the drive motor related to the circulation pump 33 in step S24, the heat pump control unit 47A advances the process flow to step S25.

  In step S25, the heat pump control unit 47A determines whether or not the boiling operation should be continued by confirming the issuance status of the boiling operation command from the hot water storage unit control unit 39. As a result of the determination in step S25, when it is determined that the boiling operation should be continued, the heat pump control unit 47A returns the process flow to step S12, and causes the following processing to be performed. If it is determined that the operation should not be continued, the series of boiling operations is terminated.

(Operational effect of the heat pump type water heater 11A according to the first embodiment of the present invention)
In the heat pump hot water heater 11A according to the first embodiment of the present invention, the heat pump control unit 47A causes the post-heating temperature of the raw water detected by the post-heating temperature sensor 45 to reach a target value related to a predetermined boiling temperature. If not, the rotational speed of the drive motor related to the compressor 19 and the rotational speed of the drive motor related to the circulation pump 33 are adjusted so that the temperature after heating of the raw water matches the target value related to the boiling temperature. While adopting a configuration that allows boiling operation to boil raw water.

  According to the heat pump type hot water heater 11A according to the first embodiment of the present invention, the heat pump control unit 47A, when the temperature after heating of the raw water does not reach the target value related to the boiling temperature, the temperature after heating of the raw water Is discharged from the compressor 19 in order to perform a boiling operation of boiling the raw water while adjusting the rotational speed of the drive motor related to the compressor 19 so that the rotational speed of the drive motor related to the compressor 19 is adjusted so as to match the target value related to the boiling temperature. The circulation flow rate, temperature, and pressure of the compressed refrigerant are higher than before adjustment. As a result, the heating capacity of the water / refrigerant heat exchanger 21 is also higher than before the adjustment, so that the temperature after heating of the raw water can be increased (see FIG. 3; the comparative example relates to the compressor 19). No rotation speed adjustment of drive motor).

  Moreover, according to the heat pump hot water heater 11A according to the first embodiment of the present invention, the heat pump control unit 47A can heat the raw water when the temperature after heating of the raw water does not reach the target value related to the boiling temperature. The boiling operation of boiling the raw water is performed while adjusting the rotational speed of the drive motor related to the circulation pump 33 to the low speed side so that the post-temperature matches the target value related to the boiling temperature. As a result, by reducing the circulation flow rate of the raw water to be heated, the heating capacity necessary to reach the target value related to the boiling temperature after heating the raw water can be reduced. The temperature can be increased after heating the raw water. (See FIG. 4; in the comparative example, there is no decrease in the circulation flow rate because there is no rotation speed adjustment of the drive motor related to the circulation pump 33).

  Therefore, according to the heat pump type water heater 11A according to the first embodiment of the present invention, the rotational speed adjusting action of the drive motor related to the compressor 19 and the rotational speed adjusting action of the drive motor related to the circulation pump 33 are combined, The temperature of the raw water to be heated (corresponding to the “liquid” in the present invention) can be made to reach the target value related to the boiling temperature promptly from the beginning of the boiling operation.

  In addition, according to the heat pump type water heater 11A according to the first embodiment of the present invention, after the temperature after heating of the raw water reaches the target value related to the boiling temperature, the required target heating capacity is maintained and the water is raised. Driving can be continued.

  Furthermore, according to the heat pump type water heater 11A according to the first embodiment of the present invention, it is possible to avoid the boiling time from becoming longer than the initial plan, and within the range of the time zone in which midnight power can be used. The required temperature and amount of hot water can be secured.

[Second Embodiment]
(System configuration of the heat pump type liquid supply device according to the second embodiment of the present invention)
FIG. 5 is a system configuration diagram of the heat pump type liquid supply apparatus according to the second embodiment of the present invention. Hereinafter, in the heat pump type liquid supply device according to the second embodiment of the present invention, as in the first embodiment of the present invention, the heat pump cycle 14 and the hot water storage cycle 16 are cooperatively driven as shown in FIG. The heat pump type hot water heater 11B will be described by exemplifying the heat pump hot water heater 11B which stores hot water having a target value related to the boiling temperature in the hot water storage tank 31 and supplies it to various places in the hot water supply system as necessary.

  In addition, in the heat pump type hot water heater 11A according to the first embodiment shown in FIG. 1 and the heat pump type hot water heater 11B according to the second embodiment shown in FIG. 5, except for the configuration of the heat pump control units 47A and 47B, the other The configuration is common. Therefore, members having a common function between the first and second embodiments are denoted by common reference numerals, description thereof is omitted, and description will be made focusing on the above differences.

  In the heat pump hot water heater 11A according to the first embodiment, the heat pump control unit 47A sets a target value related to the discharge refrigerant pressure discharged from the compressor 19 and acquires the compressor 19 acquired from the compressed refrigerant pressure sensor 20. It is determined whether or not the discharge refrigerant pressure matches the target value related to the set discharge refrigerant pressure. As a result of the determination, the discharge refrigerant pressure does not match the target value related to the discharge refrigerant pressure. When the determination is made, control is performed to adjust the opening of the valve body related to the pressure reducing valve 23 so that the discharged refrigerant pressure matches the target value related to the discharged refrigerant pressure.

  On the other hand, in the heat pump type water heater 11B according to the second embodiment, the heat pump control unit 47B sets a target value related to the discharged refrigerant temperature discharged from the compressor 19 and acquires it from the discharged refrigerant temperature sensor 18. It is determined whether or not the discharged refrigerant temperature of the compressor 19 coincides with the set target value related to the set discharge refrigerant temperature. As a result of the determination, the discharged refrigerant temperature is equal to the target value related to the discharged refrigerant temperature. When it is determined that they do not match, control is performed to adjust the opening degree of the valve body related to the pressure reducing valve 23 so that the discharged refrigerant temperature matches the target value related to the discharged refrigerant temperature.

  In short, in the heat pump type hot water heater 11A according to the first embodiment, the opening degree adjustment control of the valve body related to the pressure reducing valve 23 is performed using the refrigerant discharge pressure of the compressor 19, whereas the heat pump type water heater 11A according to the second embodiment relates to the second embodiment. In the heat pump water heater 11B, the opening adjustment control of the valve body related to the pressure reducing valve 23 is performed using the refrigerant temperature discharged from the compressor 19, and the opening adjustment control of the valve body related to the pressure reducing valve 23 is performed. Parameters are different for “pressure” and “temperature”. The “pressure” and “temperature” related to the refrigerant discharged from the compressor 19 have a common technical idea in that both have a correlation with the heating capacity related to the water / refrigerant heat exchanger 21.

(Operation of the heat pump type water heater 11B according to the second embodiment of the present invention)
Next, the flow of processing when causing the heat pump type water heater 11B according to the second embodiment of the present invention to perform a boiling operation will be described with reference to FIG. FIG. 6 is a flowchart showing the flow of processing when the heat pump type liquid supply apparatus according to the second embodiment of the present invention performs a boiling operation.
6 is started at the timing when the hot water storage unit control unit 39 issues a boiling operation start command to the heat pump control unit 47B, as in the first embodiment.

  The process flow according to the second embodiment shown in FIG. 6 is the same as the process flow according to the first embodiment shown in FIG. 2 except for steps S13B, S15B, and S16B. Therefore, the flow of processing according to steps S11 to S17, which are the first half, will be described to replace the operation description according to the second embodiment.

In step S11, the heat pump control unit 47B performs control to start the compressor 19, the pressure reducing valve 23, and the circulation pump 33 with initial values. Thereby, the drive motor which concerns on the compressor 19 drives with the rotational speed set as an initial value. The pressure reducing valve 23 opens the valve body at an opening set as an initial value. The drive motor related to the circulation pump 33 is driven at a rotation speed set as an initial value.
The heat pump control unit 47B controls the drive motor related to the circulation pump 33 to operate while maintaining the rotational speed set as the initial value until the circulating water flow rate is stabilized.

  In step S <b> 12, the heat pump control unit 47 </ b> B acquires the outside air temperature detected by the outside air temperature sensor 42 and the raw water temperature detected by the raw water temperature sensor 43.

  In step S13B, the heat pump control unit 47B obtains the target value related to the boiling temperature and the target value related to the discharge refrigerant temperature (difference from step S13A) based on the outside air temperature and raw water temperature acquired in step S12. set.

  In step S14, the heat pump control unit 47B performs the required heating for the water / refrigerant heat exchanger 21 based on the outside air temperature and raw water temperature acquired in step S12, and the target value related to the boiling temperature set in step S13B. A reference value related to the rotational speed of the drive motor related to the compressor 19 for realizing the capacity is calculated.

  In step S15B, the heat pump control unit 47B acquires the discharge refrigerant temperature (difference from step S15A) from the compressor 19 detected by the discharge refrigerant temperature sensor 18.

  In step S16B, the heat pump control unit 47B determines whether or not the discharge refrigerant temperature acquired in step S15B matches the target value related to the discharge refrigerant temperature set in step S13B (difference from step S16A). As a result of the determination in step S16B, when it is determined that the discharged refrigerant temperature does not match the target value related to the discharged refrigerant temperature, the heat pump control unit 47A advances the process flow to step S17, while the discharged refrigerant temperature If it is determined that the temperature matches the target value related to the discharged refrigerant temperature, the flow of processing proceeds to step S18.

  In step S <b> 17, the heat pump control unit 47 </ b> B performs control to adjust the opening degree of the valve body related to the pressure reducing valve 23 so that the discharged refrigerant temperature matches the target value related to the discharged refrigerant temperature. Specifically, when the discharge refrigerant temperature is lower than the target value related to the discharge refrigerant temperature, the heat pump control unit 47B performs control to adjust the valve body related to the pressure reducing valve 23 to be closed (closed). When the refrigerant temperature is higher than the target value related to the discharged refrigerant temperature, control is performed to adjust the valve body related to the pressure reducing valve 23 to open. Thereafter, the heat pump control unit 47B advances the process flow to the next step S18.

(Operational effect of the heat pump type hot water heater 11B according to the second embodiment of the present invention)
In the heat pump type hot water heater 11B according to the second embodiment of the present invention, the heat pump control unit 47B is configured so that the temperature after heating of the raw water detected by the temperature sensor 45 after heating is related to the boiling temperature, as in the first embodiment. When the target value has not been reached, the rotation speed of the drive motor related to the compressor 19 and the rotation of the drive motor related to the circulation pump 33 so that the temperature after heating of the raw water matches the target value related to the boiling temperature. It was decided to adopt a configuration in which boiling operation was performed to boil raw water while adjusting the speed.

  According to the heat pump type water heater 11B according to the second embodiment of the present invention, the heat pump control unit 47B, as in the first embodiment, does not reach the target value related to the boiling temperature of the raw water after heating. In this case, in order to perform the boiling operation of boiling the raw water while adjusting the rotational speed of the drive motor related to the compressor 19 to the high speed side so that the temperature after heating of the raw water matches the target value related to the boiling temperature, The circulation flow rate, temperature, and pressure of the compressed refrigerant discharged from the compressor 19 are higher than before the adjustment. As a result, the heating capacity of the water / refrigerant heat exchanger 21 is also higher than before the adjustment, so that the temperature after heating of the raw water can be increased (see FIG. 3; the comparative example relates to the compressor 19). No rotation speed adjustment of drive motor).

  Moreover, according to the heat pump type hot water heater 11B according to the second embodiment of the present invention, the heat pump control unit 47B, as in the first embodiment, the temperature after heating of the raw water reaches the target value related to the boiling temperature. If not, the boiling operation of boiling the raw water is performed while adjusting the rotational speed of the drive motor related to the circulation pump 33 to the low speed side so that the temperature after heating of the raw water coincides with the target value related to the boiling temperature. . As a result, by reducing the circulation flow rate of the raw water to be heated, the heating capacity necessary to reach the target value related to the boiling temperature after heating the raw water can be reduced. The temperature can be increased after heating the raw water. (See FIG. 4; in the comparative example, there is no decrease in the circulation flow rate because there is no rotation speed adjustment of the drive motor related to the circulation pump 33).

  Therefore, according to the heat pump type water heater 11B according to the second embodiment of the present invention, as in the first embodiment, the rotational speed adjusting action of the drive motor according to the compressor 19 and the drive motor according to the circulation pump 33 are controlled. Combined with the rotation speed adjustment action, the temperature of the raw water to be heated (corresponding to “liquid” in the present invention) can be quickly reached to the target value related to the boiling temperature from the beginning of the boiling operation. .

  Moreover, according to the heat pump type hot water heater 11B according to the second embodiment of the present invention, as in the first embodiment, after the temperature after heating of the raw water reaches the target value related to the boiling temperature, the required target heating is performed. The boiling operation can be continued while maintaining the capacity.

  Furthermore, according to the heat pump type water heater 11B according to the second embodiment of the present invention, as in the first embodiment, it is possible to avoid that the boiling time is longer than the initial plan, and the midnight power is reduced. The necessary temperature and amount of hot water can be secured within the available time zone.

[Other Embodiments]
The plurality of embodiments described above show examples of implementation of the present invention. Therefore, the technical scope of the present invention should not be limitedly interpreted by these. This is because the present invention can be implemented in various forms without departing from the gist or main features thereof.

  For example, as the heat pump hot water heaters 11A and 11B according to the first and second embodiments of the present invention, the heat pump unit 13 and the hot water storage unit 15, which are separate from each other, communicate with each other via the outward piping 17a and the backward piping 17b. Although the aspect which connects and comprises is illustrated and demonstrated, this invention is not limited to this example. The aspect of the heat pump type hot water heaters 11A and 11B in which the heat pump unit 13 and the hot water storage unit 15 are integrally configured and the constituent members 13 and 15 are connected to each other via the forward piping 17a and the backward piping 17b, respectively. It is included in the range of the technical range.

  Moreover, although the tap water supplied from the water supply source via the water supply pipe 35 has been described as an example of the “liquid to be heated” in the present invention, the present invention is not limited to this example. As the “liquid to be heated” in the present invention, for example, well water may be employed. In addition to water, a liquid containing a latent heat storage material, brine, antifreeze liquid, or the like may be adopted as the “liquid to be heated” in the present invention.

  Moreover, although the aspect which adjusts the pressure of a refrigerant | coolant by adjusting the opening degree of the valve body which concerns on the pressure reducing valve 23 as "the means to adjust the pressure of a refrigerant | coolant" of this invention was demonstrated and demonstrated, this invention is It is not limited to this example. As the “means for adjusting the pressure of the refrigerant” of the present invention, any means may be adopted as long as the pressure of the refrigerant flowing into the water / refrigerant heat exchanger 21 can be adjusted.

  Finally, as a “means for adjusting the circulation flow rate of the liquid” of the present invention, a drive motor related to the circulation pump 33 is illustrated, and an aspect of adjusting the circulation flow rate of the liquid by adjusting the rotational speed of the drive motor is illustrated. Although illustrated and described, the present invention is not limited to this example. It goes without saying that any means may be adopted as the “means for adjusting the circulation flow rate of the liquid” in the present invention as long as the circulation flow rate of the liquid flowing into the water / refrigerant heat exchanger 21 can be adjusted. Absent.

11A Heat pump type hot water heater (heat pump type liquid supply device) according to the first embodiment
11B Heat pump type hot water heater (heat pump type liquid supply device) according to the second embodiment
13 Heat Pump Unit 14 Heat Pump Cycle 15 Hot Water Storage Unit 16 Hot Water Storage Cycle (Liquid Storage Cycle)
17a Outward piping 17b Return piping 18 Discharge refrigerant temperature sensor (discharge refrigerant temperature detection part)
19 Compressor 20 Compressed refrigerant pressure sensor 21 Water / refrigerant heat exchanger (liquid / refrigerant heat exchanger)
21a Refrigerant side heat transfer tube 21b Water side heat transfer tube 23 Electric pressure reducing valve (pressure adjusting part)
25 Evaporator 27 Blower fan 27a Fan motor 31 Hot water storage tank (tank)
33 Circulation pump 35 Water supply piping 37 Hot water supply piping 39 Hot water storage unit control unit 41 Water / refrigerant heat exchanger outlet side refrigerant temperature sensor 42 Outside air temperature sensor (outside air temperature detecting unit)
43 Raw water temperature sensor (raw solution temperature detector)
45 Temperature sensor after heating (temperature detector after heating)
47A Heat pump control unit according to the first embodiment 47B Heat pump control unit according to the second embodiment

Claims (7)

A compressor that compresses and discharges the refrigerant, a liquid / refrigerant heat exchanger that heats the liquid to be heated by heat exchange with the refrigerant discharged from the compressor, and the liquid / refrigerant heat exchanger that is condensed A pressure adjusting unit that adjusts the pressure of the refrigerant; and an evaporator that exchanges heat between the refrigerant decompressed by the pressure adjusting unit and air and returns the refrigerant to the compressor. The compressor, the liquid / refrigerant heat exchange A heat pump cycle in which each of the pressure vessel, the pressure adjusting unit, and the evaporator is connected via the refrigerant circulation pipe,
A tank in which the liquid is stored and the liquid / refrigerant heat exchanger are provided, and the liquid in the tank is taken out between the tank and the liquid / refrigerant heat exchanger, and the liquid / refrigerant heat exchanger is provided. And a liquid storage cycle that is connected via a return pipe that returns the liquid after being heated by the liquid / refrigerant heat exchanger to the tank,
Circulation pumps that circulate the liquid in the tank through the forward piping, the liquid / refrigerant heat exchanger, and the return piping, respectively.
A post-heating temperature detection unit that detects a post-heating temperature of the liquid after being heated by the liquid / refrigerant heat exchanger;
When the post-heating temperature of the liquid detected by the post-heating temperature detection unit has not reached a target value related to a predetermined boiling temperature, the post-heating temperature of the liquid is a target value related to the boiling temperature A heat pump control unit for performing a boiling operation for boiling the liquid while adjusting the circulation flow rate of the refrigerant and the circulation flow rate of the liquid so as to coincide with
A heat pump type liquid supply apparatus comprising: The heat pump type liquid supply device according to claim 1,
The adjustment of the circulation flow rate of the refrigerant is performed by adjusting the rotation speed of the drive motor related to the compressor, while the adjustment of the circulation flow rate of the liquid adjusts the rotation speed of the drive motor related to the circulation pump. Carried out by
A heat pump type liquid supply device. The heat pump type liquid supply device according to claim 2,
The heat pump control unit has a heating capacity related to the liquid / refrigerant heat exchanger after a temperature after heating of the liquid detected by the temperature detection unit after heating reaches a target value related to the boiling temperature. The boiling operation is performed while adjusting the rotational speed of the drive motor related to the circulation pump so as to coincide with a predetermined target value of the heating capacity.
A heat pump type liquid supply device. The heat pump type liquid supply device according to claim 2,
The heat pump control unit is configured such that after the heated temperature of the liquid detected by the heated temperature detecting unit reaches a target value related to the boiling temperature, the rotational speed of the drive motor related to the compressor is: Causing the boiling operation to be performed while adjusting the rotational speed of the drive motor related to the circulation pump so as to coincide with a predetermined reference value of the rotational speed,
A heat pump type liquid supply device. It is a heat pump type liquid supply device according to any one of claims 2 to 4,
An outside temperature detector for detecting the temperature of the outside air;
A stock solution temperature detector for detecting the temperature of the liquid before boiling in the liquid / refrigerant heat exchanger;
A discharge refrigerant temperature detector for detecting a temperature of the refrigerant discharged from the compressor;
Further comprising
The heat pump control unit is configured such that the temperature of the refrigerant detected by the discharge refrigerant temperature detection unit is the temperature of the outside air detected by the outside air temperature detection unit, the temperature of the liquid detected by the stock solution temperature detection unit, or The boiling operation is performed while adjusting the pressure of the pressure adjusting unit so as to coincide with the target value related to the temperature of the refrigerant calculated using any of the target values related to the boiling temperature.
A heat pump type liquid supply device. It is a heat pump type liquid supply device according to any one of claims 2 to 4,
An outside temperature detector for detecting the temperature of the outside air;
A stock solution temperature detector for detecting the temperature of the liquid before boiling in the liquid / refrigerant heat exchanger;
A refrigerant pressure detector for detecting the pressure of the refrigerant discharged from the compressor;
Further comprising
The heat pump control unit is configured such that the pressure of the refrigerant detected by the refrigerant pressure detection unit is the temperature of the outside air detected by the outside air temperature detection unit, the temperature of the liquid detected by the stock solution temperature detection unit, or Causing the boiling operation to be performed while adjusting the pressure of the pressure adjusting unit so as to coincide with the target value related to the pressure of the refrigerant calculated using any of the target values related to the boiling temperature.
A heat pump type liquid supply device. The heat pump type liquid supply device according to any one of claims 1 to 6,
The refrigerant is carbon dioxide;
A heat pump type liquid supply device.

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