JP2009103366A - Heat pump hot water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce initial installation costs, an installation space and running costs by performing both functions by a common heat pump unit. <P>SOLUTION: This heat pump hot water supply system includes a closed tank 30/opened tank 60 for storing hot water from heat source machines 20, a cold water supply pipe 40 for supplying cold water to a water heat exchanger 21, a hot water supply pipe 50 for discharging hot water from the water heat exchanger 21 and supplying the same to the closed tank 30/opened tank 60, a branch pipe 80 connected with the hot water supply pipe 50 at its one end side and connected with the cold water supply pipe 40 at the other end side, a three-way valve 51 disposed at one end side of the branch pipe 80 for selectively supplying the hot water from three heat source machines 20 to a closed tank 30 side and a branch pipe 80 side, a water heat exchanger 90 of which a primary side is located at the branch pipe 80, a circulation pipe 110 disposed at a secondary side of the water heat exchanger 90, and heating the water by the hot water in the branch pipe 80 when the three-way valve 51 is switched to a branch pipe 80 side, and a bathtub 100 in which the cold water is distributed to the circulation pipe 110 and the hot water from the water heat exchanger 90 is supplied thereto. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat pump hot water supply system used in the commercial hot water supply field that uses a large amount of hot water, and relates to a technique for improving heating and heat retention efficiency.

  In the field of commercial hot water supply, a hot water heater (boiler) for shower hot water and a hot water heater (boiler) for heating / warming the bathtub were separately installed. If different hot water supply systems are installed in this way, there is a problem that the installation cost increases and the installation space increases. For this reason, a heat pump hot water supply system that uses a heat pump to supply hot water is known as a hot water supply system that is used in a business type that uses a large amount of hot water such as a family restaurant, an elderly welfare facility, or a business hotel (see, for example, Patent Document 1). ).

  FIG. 7 is an explanatory diagram showing a configuration of a heat pump hot water supply system 500 which is an example of such a heat pump hot water supply system. In the heat pump hot water supply system 500, a plurality of heat source units 510 and a system tank unit 520 are connected in parallel by a water supply pipe 530 and a hot water supply pipe 540, respectively. An open tank 550 is connected to the outlet side of the hot water supply pipe 540. A hot water supply pipe 560 is further connected to the open tank 550 via a pump 561, and the other end of the hot water supply pipe 560 is connected to the bathtub 570 so that hot water can be supplied. The bathtub 570 is provided with a reheating pipeline 580 and is reheated by the boiler 581. A heater may be used instead of the boiler. Moreover, hot water may be used for floor heating instead of a bathtub.

In such a heat pump hot water supply system, the hot water in the bathtub 570 is replaced at a rate of about once every three days, and the other day is reheated and kept warm by the boiler 581 so that the temperature is appropriate.
JP 2007-205698 A

  The heat pump hot water supply system described above has the following problems. That is, the heater for hot water supply and the heater for reheating and heat insulation for bathtubs and floor heating are separately provided, and the initial installation cost is high.

  Then, this invention aims at providing the heat pump hot-water supply system which can reduce an initial installation cost, an installation space, and a running cost by performing both functions with the same heat pump unit.

  In order to solve the problems and achieve the object, the heat pump hot water supply system of the present invention is configured as follows.

  A plurality of heat source units that generate and supply hot water with a water heat exchanger of a heat pump hot water supply device, a sealed tank that stores hot water generated by the water heat exchanger, and a tank connected to the sealed tank A cold water supply pipe for supplying cold water to the water heat exchanger, a hot water supply pipe for discharging hot water from the water heat exchanger and supplying it to the sealed tank, and the sealed tank and the hot water supply pipe. Connected to the open tank for storing hot water supplied from the sealed tank, a hot water supply pipe connected at one end to the open tank for supplying hot water from the open tank to a user terminal by a supply pump, and the open tank A hot water tank for storing hot water supplied from a tank, a branch pipe having one end connected to the hot water supply pipe and the other end connected to the cold water supply pipe, and provided at one end of the branch pipe Et A switching valve for selectively supplying hot water discharged from at least one of the plurality of heat source units to the sealed tank side and the branch pipe side, and a middle part of the branch pipe as a primary It is characterized by comprising a water heat exchanger as a side, and a circulation pipe for sending water in the hot water tank or hot water to the secondary side of the water heat exchanger.

A plurality of heat source units that generate and supply hot water with a water heat exchanger of a heat pump hot water supply device, a sealed tank that stores hot water generated by the water heat exchanger, and a tank connected to the sealed tank A cold water supply pipe for supplying cold water to the water heat exchanger, a hot water supply pipe for discharging hot water from the water heat exchanger and supplying it to the sealed tank, and the sealed tank and the hot water supply pipe. Connected to the open tank for storing hot water supplied from the sealed tank, a hot water supply pipe connected at one end to the open tank for supplying hot water from the open tank to a user terminal by a supply pump, and the open tank A hot water tank for storing hot water supplied from the tank;
One end side is connected to the hot water supply pipe, the other end side is connected to the cold water supply pipe, and a flow rate is provided on one end side of the branch pipe to adjust the flow rate of the hot water discharged from the sealed tank A regulating valve, a water heat exchanger having a middle part of the branch pipe as a primary side, and a circulation pipe for sending water in the hot water tank or hot water to the secondary side of the water heat exchanger. Features.

  According to the present invention, it is possible to reduce initial installation cost, installation space, and running cost by performing both functions with the same heat pump unit.

  FIG. 1 is an explanatory diagram showing a configuration of a heat pump hot water supply system 10 according to a first embodiment of the present invention, FIG. 2 is an explanatory diagram showing a configuration of a heat source device 20 incorporated in the heat pump hot water supply system 10, and FIG. 3 is a heat pump FIG. 4 is an explanatory view showing another display example of the system controller 120. FIG. 4 is an explanatory view showing another display example of the system controller 120 incorporated in the hot water supply system 10.

  As shown in FIG. 1, the heat pump hot water supply system 10 is generated by six heat source units 20 that generate and supply hot water with a water heat exchanger 21 (see FIG. 2) of a heat pump hot water supply device, and a water heat exchanger 21. A sealed tank 30 for storing the heated water, a cold water supply pipe 40 connected to the sealed tank 30 for supplying cold water to the water heat exchanger 21, and discharging the hot water from the water heat exchanger 21, A hot water supply pipe 50 that supplies the sealed tank 30 is provided. Cold water is supplied to the cold water supply pipe 40 from an external water pipe. The sealed tank 30 is provided with a temperature sensor and a water amount sensor, and is input to the system controller 120 described later.

  The open tank 60 is connected to the closed tank 30 via the hot water supply pipe 50 and stores hot water supplied from the closed tank 30, and the open tank 60 is connected to the open tank 60 at one end by the supply pump 71. The hot water supply pipe 70 that supplies the hot water to the use terminal such as the faucet 72, the bathtub 100, and the shower is provided. The open tank 60 is provided with a temperature sensor and a water amount sensor, and is input to the system controller 120.

  One end of a branch pipe 80 is connected to the hot water supply pipe 50 via a three-way valve (switching valve) 51, and the other end of the branch pipe 80 is connected to the cold water supply pipe 40 via a three-way valve 41. . The three-way valve 51 has a function of selectively switching whether the warm water generated by the three heat source devices 20 on the left side in FIG. 1 is flowed to the closed tank 30 side or the branch pipe 80 side. Switching operation of the three-way valves 41 and 51 is performed by the system controller 120.

  The hot water supply pipe 70 is provided with a pump 71, and supplies hot water to the faucet 72, the bathtub 100, the shower, and the like as necessary.

  A midway portion of the branch pipe 80 is introduced to the primary side of the water heat exchanger 90.

  In the figure, reference numeral 100 denotes a bathtub (hot water tank), and a circulation pipe 110 is connected to the bathtub 100. The middle part of the circulation pipe 110 is provided on the secondary side of the water heat exchanger 90, and the water in the bathtub 100 or the hot water is heated by the hot water sent from the heat source unit 20 when the switching valve 51 is switched to the branch pipe 80 side. The The circulation pipe 110 is provided with a filter 111 and a variable capacity type pump 112.

  These units are connected to a system controller (control unit) 120 and controlled as described later.

  As shown in FIG. 2, the heat source unit 20 includes a water heat exchanger 21 that performs heat exchange between the refrigerant and water, an expansion valve 22 that expands the refrigerant deprived of heat by the water heat exchanger 21, An evaporator 23 that absorbs heat from the refrigerant and evaporates the refrigerant, a compressor 24 that compresses the heated refrigerant, a refrigerant pipe 25 that connects these, and a fan 26 that introduces heat into the evaporator 23 from the outside. ing.

  In addition, a circulation pump 27 that sends cold water from the cold water supply pipe 40 to the water heat exchanger 21 is provided, and an outlet of the water heat exchanger 21 is connected to the hot water supply pipe 50. For example, an HFC refrigerant such as R410A is used as the refrigerant.

  The heat pump hot water supply system 10 configured as described above operates as follows. When hot water is supplied to the open tank 60, the system controller 120 sets the temperature and the amount of water as shown in FIG. Each unit operates based on this setting. That is, when cold water is supplied from the cold water supply pipe 40 to each heat source apparatus 20 and the compressor 24, the fan 26, and the circulation pump 27 are driven in each heat source apparatus 20, the sealed tank 30 and the Hot water is supplied to the open tank 60. A pump 71 is driven from the open tank 60 as necessary, and hot water is supplied to the faucet 72, the bathtub 100, the shower, and the like via the hot water supply pipe 70.

  When reheating / warming the bathtub 100, the system controller 120 sets the hot water temperature and the start / end time as shown in FIG. The hot water generated by the three heat source units 20 on the left side in the drawing is introduced to the branch pipe 80 side. The hot water introduced into the branch pipe 80 is supplied to the primary side of the water heat exchanger 90. On the other hand, the water or hot water in the bathtub 100 is supplied to the circulation pipe 110, filtered by the filter 111, and then supplied to the secondary side of the water heat exchanger 90 by the circulation pump 112. Thereby, the water or warm water in the circulation piping 110 is heated and returned in the bathtub 100.

  The three-way valves 41 and 51 may be operated so that the hot water in the branch pipe 80 does not stagnate for a long time even when the bathtub 100 is not used. Thereby, the hot water supplied to the open type tank 60 can always be new.

  When the set temperature is reached, the three-way valves 41 and 51 are switched, and the hot water generated by the three heat source units 20 on the left side in the drawing is supplied to the closed tank 30 side.

  According to the water supply system 10 configured as described above, the heat generated by the heat source device 20 can be used for hot water supply to the open tank 60 as well as for reheating / warming the bathtub 100, so that a boiler or a heater can be used. The initial installation cost, installation space, and running cost can be reduced.

  Moreover, the reheating and heat insulation of the bathtub 100 can be performed automatically by switching the three-way valves 41 and 51 by the system controller 120.

  FIG. 5 is an explanatory diagram showing a configuration of a heat pump hot water supply system 200 according to the second embodiment of the present invention. In FIG. 5, the same functional parts as those in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The branch pipe 80 includes a hot water side additional branch pipe 81 connected to the hot water supply pipe 50 and a cold water side additional branch pipe 82 connected to the cold water supply pipe 40. The hot water side additional branch pipe 81 is connected to the hot water supply pipe 50 via a three-way valve (additional switching valve) 52 between the first heat source unit 20 on the left side and the second unit on the left side in FIG. The cold water side additional branch pipe 82 is connected to the cold water supply pipe 40 via the three-way valve 42 between the first heat source unit 20 on the left side and the second left side in FIG. In other words, the three-way valve 42 is connected to a position that sandwiches the outlet of at least one heat source unit 20 with respect to the switching valve 41 and is separated from the sealed tank 30. The three-way valve 42 has a function of selectively supplying hot water discharged from the heat source device 20 at the left end in FIG. 4 to the sealed tank 30 side and the hot water side additional branch pipe 81 side.

  In the heat pump hot water supply system 200 configured as described above, the reheating / warming ability of the bathtub 100 can be switched in two stages by the operation of the three-way valves 41, 51 and the three-way valves 42, 52, and therefore appropriate temperature adjustment is performed. It becomes possible.

  Therefore, the same effect as that of the heat pump hot water supply system 10 can be obtained, and more precise temperature adjustment can be performed.

  FIG. 6 is an explanatory diagram showing the configuration of a heat pump hot water supply system 300 according to the third embodiment of the present invention.

  The heat pump hot water supply system 300 includes eight heat source units 320 that generate and supply hot water using the water heat exchanger 321 of the heat pump hot water supply device, a sealed tank 330 that stores the hot water generated by the water heat exchanger 321, and A cold water supply pipe 340 that is connected to the sealed tank 330 and supplies cold water to the water heat exchanger 321; a hot water supply pipe 350 that discharges hot water from the water heat exchanger 321 and supplies the hot water to the sealed tank 330; It has. Cold water is supplied to the cold water supply pipe 340 from an external water pipe. The sealed tank 330 is provided with a temperature sensor and a water amount sensor, and is input to a system controller 420 described later. In addition, since the heat source machine 320 is the structure similar to the heat source machine 20 mentioned above, detailed description is abbreviate | omitted.

  A pressure reducing valve 341 is provided on the inlet side of the cold water supply pipe 340, and a check valve 342 is provided between the sealed tank 330 and each heat source unit 320.

  The open tank 360 is connected to the closed tank 330 via the hot water supply pipe 350 and stores hot water supplied from the closed tank 330, and one end of the open tank 360 is connected to the open tank 360. A faucet 372, a bathtub 400, and a hot water supply pipe 370 for supplying to a user terminal such as a shower are provided. The open tank 360 is provided with a temperature sensor and a water amount sensor, and is input to the system controller 420. A flow rate adjustment valve 351 is provided between the closed tank 330 and the open tank 360 of the hot water supply pipe 350.

  One end of the branch pipe 380 is connected to the hot water supply pipe 350, and the other end of the branch pipe 380 is connected to the cold water supply pipe 340.

  The hot water supply pipe 370 is provided with a pump 371 and supplies hot water to the faucet 372, the bathtub 400, the shower, and the like as necessary.

  A midway portion of the branch pipe 380 is introduced to the primary side of the water heat exchanger 390. A flow rate adjustment valve 381 is provided on the branch pipe 380 on the hot water supply pipe 350 side. Further, a variable capacity primary pump 382 for supplying hot water to the water heat exchanger 390 is provided.

  In the figure, reference numeral 400 denotes a bathtub (hot water tank), and a circulation pipe 410 is connected to the bathtub 400. The middle part of the circulation pipe 410 is provided on the secondary side of the water heat exchanger 390, and the water in the bathtub 400 or the hot water is heated by the hot water sent from the sealed tank 330 when the flow rate adjustment valve 381 is opened. The circulation pipe 410 is provided with a filter 411 and a variable capacity secondary pump 412.

  These units are connected to a system controller (control unit) 420 and controlled as described later.

  The heat pump hot water supply system 300 configured as described above operates as follows. When hot water is supplied to the open type tank 360, cold water is supplied from the cold water supply pipe 340 to each heat source unit 320, and the heat source unit 320 is connected to the sealed type tank 330 and the open type tank 360 via the hot water supply pipe 350. Hot water is supplied. A pump 371 is driven from the open tank 360 as necessary, and hot water is supplied to the faucet 372, the bathtub 400, the shower, and the like via the hot water supply pipe 370.

  When reheating and warming the bath 400, the flow rate adjustment valve 381 is opened by a command from the system controller 420, and hot water (for example, 65 ° C.) generated by the heat source device 320 is introduced to the branch pipe 380 side. Is done. The hot water introduced into the branch pipe 380 is supplied to the primary side of the water heat exchanger 390. After the supplied hot water passes through the water heat exchanger 390, the temperature drops (for example, 45 ° C.). On the other hand, the water (for example, 40.5 ° C.) in the bathtub 400 is supplied to the circulation pipe 410, filtered by the filter 411, and then supplied to the secondary side of the water heat exchanger 390 by the circulation pump 412. Thereby, the water in the circulation piping 410 becomes warm water (for example, 42 ° C.) and is returned into the bathtub 400. When the set temperature is reached, the flow rate adjustment valve 381 is closed.

  According to the water supply system 300 configured in this way, the heat generated by the heat source device 320 can be used for hot water supply to the open-type tank 360 as well as for reheating / warming the bathtub 400. The initial installation cost, installation space, and running cost can be reduced.

  Further, by adjusting the flow rate adjusting valves 351 and 381 by the system controller 420, hot water supply to the open tank 60 and reheating / warming of the bathtub 400 can be automatically performed.

  The present invention is not limited to the above embodiment. For example, in the above-described example, the bathtub 400 is illustrated as the hot water tank, but it can also be applied to a hot water pipe for floor heating. Of course, various modifications can be made without departing from the scope of the present invention.

Explanatory drawing which shows the structure of the heat pump hot-water supply system which concerns on the 1st Embodiment of this invention. Explanatory drawing which shows the structure of the heat source machine integrated in the heat pump hot-water supply system. Explanatory drawing which shows the example of a display of the system controller integrated in the heat pump hot-water supply system. Explanatory drawing which shows another example of a display of the same system controller. Explanatory drawing which shows the structure of the heat pump hot-water supply system which concerns on the 2nd Embodiment of this invention. Explanatory drawing which shows the structure of the heat pump hot-water supply system which concerns on the 3rd Embodiment of this invention. Explanatory drawing which shows the structure of the conventional heat pump hot-water supply system.

Explanation of symbols

  10, 200, 300 ... Heat pump hot water supply system, 20, 320 ... Heat source machine, 21, 321 ... Water heat exchanger, 30, 330 ... Sealed tank, 40, 340 ... Cold water supply pipe, 51 ... Three-way valve (switching valve) 50, 350 ... Warm water supply pipe, 52 ... Three-way valve (additional switching valve), 60, 360 ... Open tank, 70, 370 ... Hot water supply pipe, 80, 380 ... Branch pipe, 90, 390 ... Water heat exchanger, 100, 400 ... Bathtub, 110, 410 ... Circulating piping, 120, 420 ... System controller (control unit).

Claims (7)

A plurality of heat source units that generate and supply hot water in a water heat exchanger of a heat pump hot water supply device;
A sealed tank for storing hot water generated by the water heat exchanger;
A cold water supply pipe connected to the sealed tank and supplying cold water to the water heat exchanger;
A hot water supply pipe for discharging hot water from the water heat exchanger and supplying the hot water to the sealed tank;
An open-type tank connected to the sealed tank via the hot water supply pipe and storing hot water supplied from the sealed tank;
One end of the open tank is connected to the hot water supply pipe for supplying hot water from the open tank to the user terminal by a supply pump;
A hot water tank for storing hot water supplied from the open tank;
A branch pipe having one end connected to the hot water supply pipe and the other end connected to the cold water supply pipe;
A switching valve that is provided at one end of the branch pipe and selectively supplies hot water discharged from at least one heat source machine among the plurality of heat source machines to the sealed tank side and the branch pipe side;
A water heat exchanger having a middle part of the branch pipe as a primary side;
A heat pump hot-water supply system, comprising: water in the hot water tank or circulation piping for sending hot water to a secondary side of the water heat exchanger. One end side sandwiches the outlet of at least one heat source unit with respect to the switching valve and is connected to the hot water supply pipe at a position spaced from the sealed tank, and the other end side is connected to one end of the branch pipe and the water heat. An additional branch pipe on the hot water side connected between the exchanger and
One end side is connected between the other end of the branch pipe and the water heat exchanger, the other end side is connected to the cold water supply pipe, cold water side additional branch pipe,
It is provided on one end side of the hot water side additional branch pipe, and hot water discharged from at least one heat source machine among the plurality of heat source machines is selectively supplied to the sealed tank side and the hot water side additional branch pipe side. The heat pump hot water supply system according to claim 1, further comprising an additional switching valve to be supplied. A plurality of heat source units that generate and supply hot water in a water heat exchanger of a heat pump hot water supply device;
A sealed tank for storing hot water generated by the water heat exchanger;
A cold water supply pipe connected to the sealed tank and supplying cold water to the water heat exchanger;
A hot water supply pipe for discharging hot water from the water heat exchanger and supplying the hot water to the sealed tank;
An open-type tank connected to the sealed tank via the hot water supply pipe and storing hot water supplied from the sealed tank;
One end of the open tank is connected to the hot water supply pipe for supplying hot water from the open tank to the user terminal by a supply pump;
A hot water tank for storing hot water supplied from the open tank;
A branch pipe having one end connected to the hot water supply pipe and the other end connected to the cold water supply pipe;
A flow rate adjusting valve that is provided at one end of the branch pipe and adjusts the flow rate of hot water discharged from the sealed tank;
A water heat exchanger having a middle part of the branch pipe as a primary side;
A heat pump hot-water supply system, comprising: water in the hot water tank or circulation piping for sending hot water to a secondary side of the water heat exchanger.   The heat pump hot water supply system according to any one of claims 1 to 3, further comprising a control unit that controls the switching valve or the flow rate adjusting valve based on a setting.   The heat pump hot water supply system according to any one of claims 1 to 4, wherein the branch pipe is provided with a pump that operates every predetermined time.   The heat pump hot water supply system according to any one of claims 1 to 5, wherein at least one of the branch pipe or the circulation pipe is provided with a variable capacity pump. The circulation pipe includes a pump that operates every predetermined time;
The heat pump hot water supply system according to any one of claims 1 to 6, wherein a water temperature sensor for detecting a water temperature in the circulation pipe is provided.

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