JP2009103365A - Heat pump hot water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat pump hot water supply system capable of improving heating/heat-retaining efficiency of the water, reducing an installation cost and an operation cost, and having superior cost-saving performance and energy-saving performance. <P>SOLUTION: This heat pump hot water supply system includes a heat pump type heat source machine 20 heating a refrigerant, a heat exchanger of the heat source machine 20, a heat exchanger unit for storing hot water (water heat exchanger unit) 30 and a heat exchanger unit 40 for a bathtub respectively incorporating heat exchangers 31, 41 for heating the water by heat of the refrigerant by being connected through refrigerant pipes 71, 72, refrigerant flow rate adjustment valves 32a, 42a disposed in refrigerant pipes 32, 42 and adjusting a flow rate of the refrigerant, and an opened hot water storage tank 50 and the bathtub 60 storing the water heated by the heat exchanger unit 30 for storing hot water and the heat exchanger unit 40 for the bathtub through discharge pipes 35, 45. <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 bath heating / warming are often installed separately, which increases the installation cost and installation. There was a problem of wide space. For this reason, a hot water supply system that uses a heat pump to supply hot water is known as a heat pump 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. 3 is an explanatory diagram showing a configuration of a heat pump hot water supply system 200 which is an example of such a heat pump hot water supply system. The heat pump hot water supply system 200 includes a hot water storage tank 210 and an air-cooled heat pump device (heat source device) 230 that heats and keeps the temperature of the hot water inside the hot water storage tank 210 through a first pipe 220. Hot water is supplied from the hot water storage tank 210 to the hot water supply / shower 250 via the second pipe 240, and hot water is supplied to the water heat exchanger 270 via the third pipe 260. In the water heat exchanger 270, the hot water in the fourth pipe 290 connected to the bathtub 280 is heated by the hot water in the third pipe 260.

  In FIG. 3, reference numerals 221, 241, 261, and 291 denote pumps. Reference numeral 211 denotes a water supply valve, 292 denotes a hair catcher, and 293 denotes a filter.

  In such a heat pump hot water supply system 200, the water supply valve 211 is opened and water is supplied from the outside into the hot water storage tank 210 to a specified amount. When the water temperature in the hot water storage tank 210 is equal to or lower than the set temperature, hot water is made by the air-cooled heat pump device 230 and the hot water is stored in the hot water storage tank 210. When the water temperature falls, the heat pump device 230 reheats.

The hot water in the hot water storage tank 210 is used in the hot water supply / shower 250, and when the hot water in the bathtub 280 is heated and kept warm, the hot water is supplied to the water heat exchanger 270. The hot water in the bathtub 280 is heated.
JP 2007-205698 A

  The heat pump hot water supply system described above has the following problems. That is, since the hot water in the hot water storage tank 210 is transported to the water heat exchanger 270 with hot water, a large-sized pump 261 is required, which increases installation costs and increases power consumption. Moreover, the heat leak from the 2nd piping 260 increases. In addition, since the pressure loss increases, the piping distance cannot be increased, and the installation conditions are restricted. Furthermore, when the 2nd piping 260 passes the outdoors, the countermeasure for winter piping freezing prevention is needed.

  Accordingly, an object of the present invention is to provide a heat pump hot water supply system that improves the heating / warming efficiency of water, reduces the installation cost and the operation cost, and is excellent in cost saving and energy saving.

  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 heat pump type heat source unit that heats the refrigerant, a water heat exchanger unit that is connected to the heat exchanger of the heat source unit via a refrigerant pipe, and includes a water heat exchanger that heats water with the heat of the refrigerant; A refrigerant flow rate adjusting unit that is provided in the refrigerant pipe and adjusts the flow rate of the refrigerant, and a hot water storage tank that stores water heated by the water exchanger unit via the water pipe. .

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to reduce the installation cost and the operating cost while improving the heating and heat retention efficiency of water.

  FIG. 1 is an explanatory view showing an application example of a heat pump hot water supply system 10 according to an embodiment of the invention, and FIG. 2 is an explanatory view showing a configuration of the heat pump hot water supply system 10.

  As shown in FIG. 1, the heat pump hot water supply system 10 is installed in a building B, for example. The heat pump hot water supply system 10 is connected to a heat pump type heat source device 20 that heats a refrigerant, and the heat source unit 20 via refrigerant pipes 71 and 72 described later, and heat exchanger units for hot water storage that heat water with the heat of the refrigerant. (Water heat exchanger unit) 30, a heat exchanger unit for a bathtub (water heat exchanger unit) 40 that is connected to the heat source unit 20 and the refrigerant pipes 71 and 72 and heats water with the heat of the refrigerant, An open hot water storage tank 50 for storing water heated by the hot water storage heat exchanger unit 30 via a discharge pipe 33 described later, and a water heated by the bathtub heat exchanger unit 40 via a discharge pipe 43 described later. The bathtub 60 for storing the refrigerant, the refrigerant pipes 71 and 72 for connecting the heat source unit 20, the hot water storage heat exchanger unit 30 and the heat exchanger unit 40 for the bathtub, and a system control unit for controlling these parts in a coordinated manner. And a 100. The open hot water storage tank 50 is used for hot water supply to a shower, a faucet, etc., and the bathtub 60 is used for bathing.

  The heat source unit 20 includes a compressor, a heat exchanger, a decompression mechanism, and the like, and has a function of removing heat from the air and heating the refrigerant. For example, R410A or the like is used as the refrigerant.

  The hot water storage heat exchanger unit 30 includes a heat exchanger 31 that performs heat exchange between the refrigerant and water, a supply pipe 32 that supplies the refrigerant from the refrigerant pipe 71 to the heat exchanger 31, and refrigerant from the heat exchanger 31. A discharge pipe 33 that discharges to the pipe 72, a supply pipe (water pipe) 34 that supplies water before heating from the open hot water storage tank 50 to the heat exchanger 31, and a high temperature from the heat exchanger 31 to the open hot water storage tank 50 A discharge pipe (water pipe) 35 for discharging water and a supply pipe 36 that joins the supply pipe 34 and supplies water from the water pipe are provided.

  The supply pipe 32 is provided with a refrigerant flow rate adjustment valve 32a for adjusting the flow rate of the refrigerant. The supply pipe 34 is provided with a pump 34a and a check valve 34b. Further, the discharge pipe 35 is provided with a flow rate adjustment valve 35a for adjusting the flow rate of water. The supply pipe 36 is provided with an open / close valve 36a.

  The bathtub heat exchanger unit 40 includes a heat exchanger 41 that performs heat exchange between the refrigerant and water, a supply pipe 42 that supplies the refrigerant from the refrigerant pipe 71 to the heat exchanger 41, and a refrigerant that is refrigerant from the heat exchanger 41. A discharge pipe 43 that discharges to the pipe 72, a supply pipe (water pipe) 44 that supplies water before heating from the bathtub 60 to the heat exchanger 41, and a discharge pipe that discharges high-temperature water from the heat exchanger 41 to the bathtub 60 (Water piping) 45.

  The supply pipe 42 is provided with a refrigerant flow rate adjustment valve 42a for adjusting the flow rate of the refrigerant. The supply pipe 44 is provided with a pump 44a. Further, the pumps 34a and 44a incorporate a flow rate variable function by an inverter or the like.

  The open-type hot water storage tank 50 and the bathtub 60 are each provided with a sensor that detects the water temperature and the amount of water and outputs the detected water temperature and amount to the system control unit 100.

  The system control unit 100 includes, for example, a liquid crystal touch panel type control unit, and is connected to each unit via a bus communication circuit. It grasps the operating status of all connected devices and gives driving instructions to each device.

  The heat pump hot water supply system 10 configured as described above operates as follows by being controlled by the system control unit 100. That is, the refrigerant flowing through the refrigerant pipe 72 is heated by the heat source unit 20 and becomes a high-temperature refrigerant and is supplied to the refrigerant pipe 71. The high-temperature refrigerant is branched from the refrigerant pipe 71 and introduced into the supply pipes 32 and 42, supplied to the heat exchangers 31 and 41, and circulated through a cycle that is returned to the refrigerant pipe 72 through the discharge pipes 33 and 43.

  On the other hand, in the open type hot water storage tank 50, the electromagnetic valve 36 a is opened, water is introduced from the water pipe, and supplied to the heat exchanger 31. In the heat exchanger 31, the heat is exchanged from the high-temperature refrigerant to the low-temperature water, whereby the water is heated, and the high-temperature water is supplied to the open hot water storage tank 50 through the discharge pipe 33. The supply is continued until a predetermined amount of water accumulates in the open hot water storage tank 50.

  The amount of water in the open-type hot water storage tank 50 is a predetermined amount, and when the water temperature falls below a set value, the pump 34a is operated to supply water to the heat exchanger 31. In the heat exchanger 31, the water is reheated, and high-temperature water is returned to the open hot water storage tank 50 via the discharge pipe 33.

  In the bathtub 60, the pump 44a is operated and water is supplied to the heat exchanger 41. In the heat exchanger 41, the water is reheated and the hot water is returned to the bathtub 60 via the discharge pipe 43. The pump 44a can be operated constantly, or can be operated periodically to detect the hot water temperature of the bathtub 60.

  Further, the outlet of the hot water storage heat exchanger unit 30 and the bathtub heat exchanger unit 40 is obtained by coordinating the adjustment of the water flow rate by the pumps 34a and 44a and the adjustment of the refrigerant circulation rate by the refrigerant flow rate adjustment valves 32a and 42a. Necessary heating capacity can be ensured while keeping the hot water temperature constant. For this reason, when keeping the temperature of the bathtub 60, even if the amount of heat leak of the bathtub 60 fluctuates, the water temperature of the bathtub 60 can be kept constant, and the comfort can be improved.

  As described above, according to the heat pump hot water supply system 10 according to the present embodiment, by controlling the refrigerant flow rate, the energy obtained by the heat source device 20 can be supplied to a necessary place, and the heating efficiency is improved. Moreover, since the heat exchanger unit 30 for hot water storage, the open-type hot water storage tank 50, the heat exchanger unit 40 for bathtubs, and the bathtub 60 can be arrange | positioned in the vicinity, it becomes possible to suppress the amount of heat losses.

  Furthermore, since energy is transported using a refrigerant, resistance and heat loss can be reduced as compared with the case where energy is transported with water, and long piping and high-head installation are possible. For example, as shown in FIG. 1, a heat source device 20 on the roof, a hot water storage heat exchanger unit 30 in the basement, a bathtub heat exchanger unit 40, an open hot water storage tank 50, a bathtub 60 on the first floor, etc. It becomes possible.

  In addition, since it is not necessary to provide the water pipe outdoors, it is not necessary to take measures to prevent the water pipe from freezing in a cold region, and the installation cost can be reduced.

  By using the system control unit 100, the operation status of each device can be confirmed and a control instruction can be made at one location.

  Thus, according to the heat pump hot water supply system 10, cost saving and energy saving can be improved.

  The present invention is not limited to the above embodiment. For example, in the example described above, three heat source units 20 and two heat exchanger units on the heated side are used, but the number is not limited. Of course, various modifications can be made without departing from the scope of the present invention.

Explanatory drawing which shows the example of application of the heat pump hot-water supply system which concerns on one embodiment of this invention. Explanatory drawing which shows the structure of the heat pump hot-water supply system. Explanatory drawing which shows an example of the conventional heat pump hot-water supply system.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Heat pump hot water supply system, 20 ... Heat source machine, 30 ... Heat exchanger unit for hot water storage (water heat exchanger unit), 40 ... Heat exchanger unit for bath (water heat exchanger unit), 31, 41 ... Heat exchanger 32, 42 ... supply pipe (refrigerant pipe), 32a, 42a ... refrigerant flow rate adjustment valve, 33, 43 ... discharge pipe (refrigerant pipe), 34, 44 ... supply pipe (water pipe), 35, 45 ... discharge pipe ( Water piping), 35a ... flow rate adjusting valve, 50 ... open hot water storage tank, 60 ... bathtub, 71, 72 ... refrigerant piping, 100 ... system control unit.

Claims (3)

A heat pump heat source for heating the refrigerant;
A water heat exchanger unit that is connected to the heat exchanger of this heat source device via a refrigerant pipe and incorporates a water heat exchanger that heats water with the heat of the refrigerant;
A refrigerant flow rate adjusting unit that is provided in the refrigerant pipe and adjusts the flow rate of the refrigerant;
A heat pump hot water supply system comprising a hot water storage tank for storing water heated by the water exchanger unit through a water pipe.   The heat pump hot water supply system according to claim 1, further comprising a bus communication system that transmits a control signal for controlling the heat source unit, the water heat exchanger unit, and the refrigerant flow rate adjustment unit in a coordinated manner. .   The heat pump hot-water supply system according to claim 1, wherein the water pipe includes a flow rate adjusting unit that adjusts the flow rate of the water.

Images