JP5238315B2 - Heat pump hot water supply system - Google Patents

Description

  The present invention relates to a heat pump hot water supply system installed in, for example, a hospital that uses a relatively large amount of hot water, an elderly welfare facility, or a hotel.

  As this type of heat pump type hot water supply system, a heat pump type hot water supply apparatus configured by combining a large number of heat pump units and a sealed tank is known.

In this heat pump hot water supply system, the heat pump unit in a normal operation state is heated by supplying water from a sealed tank to a water heat exchanger via a water supply line, a three-way valve, and a pump. It supplies to a closed tank via a three-way valve and a hot water supply line. Then, after the hot water temperature is set to a desired temperature in the sealed tank, the hot water is supplied to the open tank and stored. The hot water stored in the open tank is supplied from the hot water tap through the hot water pump and the hot water supply circuit in response to a hot water supply request by opening the hot water tap (see, for example, Patent Document 1).
JP 2007-205698 A

  However, what is disclosed in Japanese Patent Application Laid-Open No. 2007-205698 is that a hot water boiled by each heat pump is stored in an open tank through a sealed tank, so that a sealed tank is required, and a heat pump unit and A pump for circulating water between the sealed tank and the like is also required, which causes a problem that the configuration is complicated and the cost is increased.

  The present invention has been made paying attention to the above circumstances, and the object of the present invention is to provide a heat pump hot water supply that can store hot water at a desired temperature in an open tank without requiring a closed tank or the like. To provide a system.

In order to solve the above-mentioned problem, the invention according to claim 1, after heating the cold water supplied to the water heat exchanger of the heat pump type hot water supply apparatus provided with the compressor through the water supply pipe to the set temperature, is heated. A plurality of heat pump units for supplying hot water at a set temperature via hot water supply pipes, an open tank for storing hot water supplied from the plurality of heat pump units, and an open tank connected to the open tank. A heat pump type hot water supply system comprising: a hot water supply unit for supplying hot water; and a system control unit for controlling the operation of the heat pump unit in accordance with the amount of hot water stored in the open tank, and the water heat in each heat pump unit A flow rate adjusting valve provided on the water inflow side of the exchanger to adjust the flow rate of water flowing into the heat exchanger, and provided in each heat pump unit Is in, characterized by comprising a control unit for controlling the operating frequency of the opening and the compressor of the flow control valve.

  According to the present invention, a sealed tank can be dispensed with, and the configuration can be simplified and the cost can be reduced.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic configuration diagram showing a heat pump hot water supply system 1A according to a first embodiment of the present invention.

  This hot water supply system 1A includes a plurality of heat pump units 2 each including a heat pump hot water supply device that generates hot water. A water supply tank (not shown) is connected to these heat pump units 2 through a water supply pipe 3, and an open tank 6 is connected through a hot water supply pipe 5.

  The water supply pipe 3 is constituted by a main pipe 3a and a plurality of branch pipes 3b branched from the main pipe 3a, and the hot water supply pipe 5 is constituted by a main pipe 5a and a plurality of branch pipes 5b branched from the main pipe 5a. ing. The branch pipe 3b of the water supply pipe 3 and the branch pipe 5b of the hot water supply pipe 5 are respectively inserted into the heat pump unit 2 and connected in a water heat exchanger 17 described later.

  One end of a hot water supply pipe 7 is connected to the open tank 6. A hot water supply pump 9 is provided in the middle of the hot water supply pipe 7, and many hot water taps 10 as hot water supply parts are connected to the other end side. Reference numeral 11 denotes a system control unit for controlling the system.

  FIG. 2 shows a hot water supply device of the heat pump unit 2.

  The hot water supply apparatus includes a compressor 13, and an air heat exchanger 14, a decompression mechanism 15, and a water heat exchanger 17 are sequentially connected to the compressor 13 through a refrigerant pipe to constitute a refrigeration cycle. .

  Further, a heat pump control unit 19 as a control means is connected to the compressor 13 via an inverter 18, and an outside air temperature detection sensor 21 for detecting the outside air temperature is connected to the heat pump control unit 19.

  On the other hand, the branch pipe 3 b of the water supply pipe 3 and the branch pipe 5 b of the hot water supply pipe 5 are respectively inserted into the heat pump unit 2 and connected within the water heat exchanger 17. The branch pipe 3b of the water supply pipe 3 is provided with a flow rate adjusting valve 22 for adjusting the amount of cold water flowing into the water heat exchanger 17, and the branch pipe 5b of the hot water supply pipe 5 detects the temperature of hot water discharged. A hot water temperature detection sensor 23 is provided.

  FIG. 3 is a block diagram showing a drive control system for the compressor 13 and the flow rate adjusting valve 22 described above.

  The hot water temperature detection sensor 23 and the outside air temperature detection sensor 21 are connected to the control unit 19 via a detection data transmission circuit, and the inverter 18 of the compressor 13 is connected to the control unit 19 via the control circuit. In addition, a flow rate adjustment valve 22 is connected.

  The control unit 19 adjusts the opening degree of the flow rate adjustment valve 22 according to the temperature of the outside air detected by the outside air temperature detection sensor 21. For example, as shown in FIG. 4, when the temperature of the outside air is 30 ° C. or higher, the flow rate of cold water is A (L / h), and when it is 25 to 30 ° C., the flow rate of cold water is B (L / h). In the case of 15 to 25 ° C., the flow rate of cold water is C (L / h). In the case of 5 to 15 ° C., the flow rate of cold water is D (L / h). The opening degree of the flow rate adjusting valve 22 is adjusted so that the flow rate of E is equal to E (L / h). The flow rates A to E have a relationship of A> B> C> D> E, and the control unit 19 performs control so as to decrease the opening degree of the flow rate adjustment valve 22 as the temperature of the outside air decreases. To do.

  Further, the control unit 19 controls the inverter 18 according to the temperature of the hot water detected by the hot water temperature detection sensor 23, and controls the operating frequency of the compressor 13 so that the hot water temperature becomes a set temperature (for example, 65 ° C.). It has become.

  In the configuration described above, when the refrigeration cycle in each heat pump unit 2 is operated and cold water is supplied to the water heat exchanger 17 in the heat pump unit 2 through the water supply pipe 3, the cold water is heated in the water heat exchanger 17. It becomes warm water. This hot water is supplied into the open tank 6 through the hot water supply pipe 5 and stored. The hot water stored in the open tank 6 is supplied to each hot water tap 10 through the hot water supply pipe 7 by the operation of the hot water supply pump 9 and used.

  By the way, the temperature of the hot water discharged from the above-described water heat exchanger 17 varies depending on the temperature of the outside air. For example, when the temperature of the outside air decreases, the temperature of the hot water discharged decreases, and the hot water having a desired temperature is obtained. Can no longer bathe.

  Therefore, in this embodiment, the inflow amount of cold water to the water heat exchanger 17 is adjusted by adjusting the opening degree of the flow rate adjustment valve 22 as described above based on the outside air temperature detected by the outside air temperature detection sensor 21. At the same time, the operating frequency of the compressor 13 is controlled based on the hot water temperature detected by the hot water temperature detection sensor 23, and the hot water temperature is adjusted to a set temperature (for example, 65 ° C.).

  Thus, according to this embodiment, while adjusting the opening degree of the flow regulating valve 22 and controlling the operating frequency of the compressor 13 to adjust the hot water temperature to a set temperature (for example, 65 ° C.), Thus, it is possible to obtain hot water at a set temperature without using a sealed tank.

  Accordingly, a sealed tank is not necessary, and a circulation pump for circulating water between the heat pump unit and the sealed tank is not necessary, so that the configuration can be simplified and the cost can be reduced.

  FIG. 5 shows a heat pump hot water supply system 1B according to the second embodiment of the present invention.

  In addition, the same number is attached | subjected about the part same as the part shown in above-mentioned 1st Embodiment, and the description is abbreviate | omitted.

  A hot water supply circulation path 27 is connected to the hot water supply pipe 7 for supplying hot water in the open tank 6, a hot water tap 8 is provided in the hot water supply circulation path 27, a circulation pump 28, and a heat pump hot water supply system. A reheating unit 29 comprising the device is arranged. The reheating unit 29 is for keeping warm water in the hot water supply circuit 27.

  A circulation path 31 is connected to the side surface of the open tank 6, and the circulation path 31 is provided with a reheating unit 32 equipped with a heat pump type hot water supply device. The reheating unit 32 keeps warm water in the open tank 6.

  The main pipe 3 a of the water supply pipe 3 is connected to the bottom surface of the open type tank 6 via a hot water prevention valve unit 34, and the hot water storage amount sensing unit 35 is connected to the bottom surface of the open type tank 6.

  The system control unit 11 is connected to the heat pump unit 2, the hot water storage amount sensing unit 35, the hot water prevention valve unit 34, the reheating units 29 and 32, the hot water supply pump 9, and the circulation pump 28 via a BUS circuit.

  According to the second embodiment, the hot water in the hot water supply circulation path 27 is circulated to be heated and kept warm by the reheating unit 29. Further, by circulating the hot water between the open tank 6 and the reheating unit 32, the hot water in the open tank 6 can be heated and kept warm.

  Furthermore, according to the second embodiment, all the information necessary for the hot water supply system can be grasped and controlled by the system control unit 11, and necessary equipment can be added and controlled.

  FIG. 6 shows a hot water supply system 1C according to the third embodiment of the present invention.

  In addition, the same number is attached | subjected about the part same as the part shown in the above-mentioned 2nd Embodiment, and the description is abbreviate | omitted.

  In the second embodiment described above, the reheating unit 32 for heat insulation is specially provided as a part for keeping the open tank 6 warm, but in the third embodiment, the heat pump unit 2 itself has an open tank. 6 heat retention function.

  That is, the water heat exchanger 17 in the heat pump unit 2 and the lower side of the open-type tank 6 are connected via the heat retaining circuit 37. The heat retaining circuit 37 is provided with a hot water temperature detecting sensor 38, a heat retaining circuit pump 39, and a check valve 40 in order along the flow direction of the hot water.

  In the above configuration, when the heat pump unit 2 is operated with the flow rate adjustment valve 22 opened, the cold water is supplied to the water heat exchanger 17 through the branch pipe 3b of the water supply pipe 3 and heated as indicated by the solid line arrow, It flows out as hot water. This hot water is supplied to the open tank 6 through the hot water supply pipe 5 and stored.

  When the hot water stored in the open tank 6 is kept warm, the heat regulating circuit pump 39 is driven at regular intervals after the flow rate adjusting valve 22 is closed. By driving the heat retaining circuit pump 39, the hot water in the open tank 6 is caused to flow into the heat retaining circuit 37 as indicated by the broken line arrow, and the hot water temperature is detected by the hot water temperature detecting sensor 38. When the detected temperature of the hot water temperature detection sensor 38 becomes a predetermined temperature or lower, the heat pump unit 2 is operated, the hot water is heated by the water heat exchanger 17 and returned to the open tank 6.

  According to the third embodiment, the function of generating hot water from cold water and the reheating function for keeping the open-type tank warm can be made possible by one heat pump unit 2, which saves space and is inexpensive. Can be realized.

  FIG. 7 shows a hot water supply system 1D according to the fourth embodiment of the present invention.

  Note that the same parts as those shown in the third embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the third embodiment described above, the heat insulation circuit pump 39, the check valve 40, and the hot water temperature detection sensor 38 are provided in the heat pump unit 2, but in this fourth embodiment, the heat insulation circuit pump. 39, a check valve 40 and a hot water temperature detection sensor 38 are disposed in a unit 42 provided outside the heat pump unit 2, and the unit 42 is connected to the middle portion of the heat retaining circuit 37.

  Also according to the fourth embodiment, the same operational effects as those of the third embodiment described above can be obtained.

  FIG. 8 shows a hot water supply system 1E according to the fifth embodiment of the present invention.

  In addition, the same number is attached | subjected about the part same as the part shown in the above-mentioned 4th Embodiment, and the description is abbreviate | omitted.

  In the fourth embodiment described above, the check valve 40 is provided in the unit 42. However, in the fifth embodiment, a three-way valve 44 is provided on the inflow side of the water heat exchanger 17, and this three-way valve is provided. A branch pipe 3 b of the water supply pipe 3 and a heat retaining circuit 37 are connected to 44.

  Also according to the fifth embodiment, it is possible to obtain the same effects as those of the above-described fourth embodiment.

  FIG. 9 shows a hot water supply system 1F according to a sixth embodiment of the present invention.

  Note that the same parts as those shown in the fifth embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the fifth embodiment described above, the heat retaining circuit 37 is connected to the three-way valve 44 in the heat pump unit 2, but in the sixth embodiment, the hot water tap 10 is connected without using the heat retaining circuit 37. The hot water supply circulation path 27 is extended and connected to the three-way valve 44 in the heat pump unit 2.

  According to the sixth embodiment, the heat retaining circuit 37 can be omitted, and the cost can be further reduced.

  FIG. 10 shows a hot water supply system 1G according to the seventh embodiment of the present invention.

  Note that the same parts as those shown in the sixth embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the sixth embodiment described above, one end portion of the hot water supply circulation path 27 is connected to the three-way valve 44 in the heat pump unit 2, but in the seventh embodiment, the end of the water heat exchanger 17 is reversed to the inflow side. A check valve 46 and a three-way valve 47 are provided on the outflow side, and the check valve 46 is connected to the outflow end of the hot water supply circuit 27. Further, the three-way valve 47 and the inflow end of the hot water supply circuit 27 are connected via a return circuit 48.

  According to the seventh embodiment, the warm water sent from the open tank 6 to the water heat exchanger 17 and reheated is directly returned from the three-way valve 47 via the return circuit 48 to the inflow side of the circulation path 27. It becomes possible to return to the hot water supply.

  FIG. 11 shows a hot water supply system 1H according to the eighth embodiment of the present invention.

  Note that the same parts as those shown in the seventh embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the seventh embodiment described above, the check valve 46 is provided on the inflow side of the water heat exchanger 17 in the heat pump unit 2, and the outflow side of the hot water supply circuit 27 is connected to the check valve 46. In the eighth embodiment, a three-way valve 50 is provided on the inflow side of the water heat exchanger 17, and the outflow side of the circulation path 27 is connected to the three-way valve 50.

  Also in the eighth embodiment, the warm water sent from the open tank 6 to the water heat exchanger 17 and reheated is returned to the inflow side of the open tank 6 and the circulation path 27 via the three-way valve 47. Can do. It is also possible to eliminate the return circuit 48 and return all hot water to the open tank 6.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments. For example, you may delete some components from all the components shown by embodiment mentioned above. Furthermore, you may combine the component covering different embodiment suitably.

The figure which shows the structure of the heat pump type hot-water supply system which is the 1st Embodiment of this invention. The figure which shows the internal structure of the heat pump unit of FIG. The block diagram which shows the drive control system of the heat pump unit of FIG. The figure which shows the operation control of the flow regulating valve and compressor by the drive control system of FIG. The figure which shows the structure of the heat pump type hot-water supply system which is the 2nd Embodiment of this invention. The figure which shows the structure of the heat pump type hot-water supply system which is the 3rd Embodiment of this invention. The figure which shows the structure of the heat pump type hot-water supply system which is the 4th Embodiment of this invention. The figure which shows the structure of the heat pump type hot-water supply system which is the 5th Embodiment of this invention. The figure which shows the structure of the heat pump type hot-water supply system which is the 6th Embodiment of this invention. The figure which shows the structure of the heat pump type hot-water supply system which is the 7th Embodiment of this invention. The figure which shows the structure of the heat pump type hot-water supply system which is the 8th Embodiment of this invention.

Explanation of symbols

    DESCRIPTION OF SYMBOLS 2 ... Heat pump unit, 3 ... Water supply pipe, 6 ... Open type tank, 10 ... Hot water tap (hot-water supply part), 13 ... Compressor, 17 ... Water heat exchanger, 19 ... Control unit (control means), 21 ... Outside temperature Detection sensor, 22 ... flow rate adjustment valve, 23 ... hot water temperature detection sensor.

Claims (3)

After heating the cold water supplied through the water supply pipe to the water heat exchanger of the heat pump type hot water supply apparatus equipped with the compressor to the set temperature, a plurality of hot water having the heated set temperature is supplied through the hot water supply pipe. A heat pump unit;
An open tank for storing hot water supplied from the plurality of heat pump units;
A hot water supply unit connected to the open tank and supplying hot water in the open tank;
A heat pump hot water supply system comprising a system control unit that controls the operation of the heat pump unit according to the amount of hot water stored in the open tank,
A flow rate adjusting valve that is provided on the water inflow side of the water heat exchanger in each heat pump unit and adjusts the flow rate of water flowing into the heat exchanger;
A heat pump hot water supply system provided in each of the heat pump units, and a control unit that controls an opening degree of the flow rate adjusting valve and an operating frequency of the compressor. Each of the plurality of heat pump units is provided with an outside air temperature detection sensor for detecting outside air temperature,
The heat pump hot water supply system according to claim 1, wherein an opening degree of the flow rate adjustment valve is adjusted according to a temperature detected by the outside air temperature detection sensor. A hot water temperature detection sensor for detecting the temperature of hot water flowing out of the water heat exchanger;
The heat pump hot water supply system according to claim 1 or 2, wherein the control unit controls an operation frequency of the compressor so that a hot water temperature detected by the hot water temperature detection sensor becomes a predetermined temperature.

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