JP2006046877A - Heat pump type hot water supply/heating system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water-refrigerant heat exchanger for heating that can be downsized and can reduce pressure loss in a refrigerant without significantly reducing a heating surface area. <P>SOLUTION: A heat pump type hot water supply/heating system comprises: a heat pump unit comprising a refrigerant circuit having a parallel circuit of a first water-refrigerant heat exchanger for heating and a second water-refrigerant heat exchanger for hot water storage; and a tank unit having an expansion tank, a first hot water circuit where a first circulating pump operates to circulate hot water for heating between the first water-refrigerant heat exchanger 9 and a hot water heater, and a second hot water circuit where a second circulating pump circulates hot water between the second water-refrigerant heat exchanger and a hot water storage tank. The first water-refrigerant heat exchanger 9 for heating is so constructed that a plurality of small diameter refrigerant tubes 64A and 64B for conducting a refrigerant are inserted in heat exchange relation in a large diameter hot water tube 63 for conducting the hot water for heating, and is configured in helical structure. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heat pump hot water supply / room heating apparatus using a heat pump unit as a heat source. Specifically, a compressor, a parallel circuit of a first water refrigerant heat exchanger for heating and a second water refrigerant heat exchanger for hot water storage, each connected to a pressure reducing device, and an air heat exchanger are sequentially connected in an annular shape. A heat pump unit provided with a refrigerant circuit, an expansion tank, a first hot water circulation path for circulating hot water between the first water refrigerant heat exchanger and the hot water heating device by operation of the first circulation pump, and the first The present invention relates to a heat pump hot water supply and heating device including a tank unit having a second hot water circulation path for circulating hot water between a two-water refrigerant heat exchanger and a hot water storage tank by a second circulation pump.

A conventional heat pump hot water supply and heating device of this type is disclosed in, for example, Patent Document 1, but in order to exchange heat between water in the expansion tank and refrigerant used in the heat pump unit, a first water refrigerant heat exchanger is provided. Although indispensable, the first water refrigerant heat exchanger is designed to reduce costs by incorporating a single refrigerant pipe into the hot water pipe to form a double pipe structure.
Description and drawings attached to application for Japanese Patent Application No. 2003-5942

  However, even with a double pipe structure in which a single refrigerant pipe is built in a hot water pipe, the length is long for sufficient heat exchange, and there is a limit to the heat exchange rate. Therefore, a water-refrigerant heat exchanger that can sufficiently perform heat exchange has been desired.

  Therefore, the present invention is configured such that the first water refrigerant heat exchanger in the heat pump unit includes a large-diameter hot water pipe through which hot water for heating passes and a plurality of small-diameter refrigerant pipes through which refrigerant passes for heat exchange. Accordingly, it is an object of the present invention to provide a water refrigerant heat exchanger for heating that can be made compact without reducing the heat conduction area so much and can reduce the pressure loss of the refrigerant.

  The invention according to claim 1 includes a compressor, a parallel circuit of a first water-refrigerant heat exchanger for heating and a second water-refrigerant heat exchanger for storing hot water, each connected with a decompression device, and an air heat exchanger. A heating pump having a refrigerant circuit sequentially connected in an annular manner, and an expansion tank, a first water / refrigerant heat exchanger, and a hot water heater are used to circulate hot water for heating by operating the first circulation pump. 1. A heat pump type hot water supply and heating device comprising a hot water circulation path and a tank unit having a second hot water circulation path for circulating hot water by a second circulation pump between the second water refrigerant heat exchanger and the hot water storage tank. The first water refrigerant heat exchanger for heating is constructed by inserting a plurality of small-diameter refrigerant pipes through which refrigerant passes into a large-diameter hot water pipe through which hot water for heating passes, and a spiral It is characterized by being wound into a shape.

  The invention according to claim 2 is the heat pump hot water supply / room heating device according to claim 1, wherein the plurality of refrigerant tubes inserted into the hot water tube are composed of at least two narrow tubes connected in parallel to each other. It is characterized by.

  According to the present invention, the first water-refrigerant heat exchanger for heating is configured by inserting a plurality of small-diameter refrigerant pipes through which refrigerant passes into a large-diameter hot water pipe through which hot water for heating passes. At the same time, since it is a spirally wound configuration, the total length of the hot water pipe can be made shorter than before without significantly reducing the heat conduction area between the refrigerant and the hot water for heating. The first water refrigerant heat exchanger can be made compact, and the length of the refrigerant pipe per pipe can be made shorter than before, so that the pressure loss of the refrigerant can be reduced, and the energy consumption efficiency (COP) Can also be increased.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a system diagram showing an overall system of a heat pump hot water supply / room heating system. In FIG. 1, A is a heat pump unit, B is a tank unit, C1 is a first hot water circuit for hot water heating, C2 is a second hot water circuit for hot water storage, and R is a refrigerant circuit built in the heat pump unit A. is there. In the refrigerant circuit R, a refrigerant such as HFC or CO ₂ can be used. In the present embodiment, CO ₂ (carbon dioxide) is used as the refrigerant.

  1 and 2 are floor heating panels provided in the first hot water circulation path C1, and 3 and 4 are floor heating remote controllers provided corresponding to the floor heating panels 1 and 2 (hereinafter referred to as "floor heating remote control"). In the first hot water circulation path C1, thermal valves 5 and 6, a circulation pump 7, an expansion tank 8, a water flow path 9B of the first water refrigerant heat exchanger 9 for heating, and a bypass pipe 10 are provided. A bypass valve 11 which is a provided flow rate adjusting valve is provided.

  The bypass pipe 10 serves as a bypass path of the first hot water circulation path C1, and when the bypass valve 11 configured by, for example, an electric valve is opened, the water flow path 9B of the first water refrigerant heat exchanger 9 is opened. The return warm water passing through is returned to the expansion tank 8 via the bypass pipe 10. The expansion tank 8 is provided with water level electrodes 19 and 20 constituting a water level detection sensor.

  The hot water circuit C1 is provided with a thermistor 12 for detecting the temperature of the hot water flowing out from the water flow path 9B of the first water refrigerant heat exchanger 9 for heating, and a fan coil 13 as a bathroom heating device. ing. 14 is a bathroom heating remote controller (hereinafter referred to as “bathroom heating remote controller”), 15 is a thermal valve provided at the inlet of the fan coil 13, and 16 is one of hot water flowing out from the expansion tank 8 by the circulation pump 7. The mixed heat valve 18 for supplying a part to the floor heating panels 1 and 2 is a thermistor 18 for detecting the temperature of hot water flowing into the floor heating panels 1 and 2.

The refrigerant circuit R includes a two-stage compression compressor 21 capable of capacity adjustment using a CO ₂ refrigerant, a heating first on-off valve 23 whose one end is connected to the compressor 21, and a hot water storage For the hot water storage connected to the second on-off valve 24, the refrigerant passage 9A of the first water refrigerant heat exchanger 9 connected to the other end of the first on-off valve 23, and the other end of the second on-off valve 24. The primary flow path 22A of the second water refrigerant heat exchanger 22, the primary flow path 25A of the internal heat exchanger 25 to which the refrigerant flow path 9A is connected, and the heating flow rate to which the other end of the primary flow path 25A is connected. An expansion valve (pressure reducing device) 26 that is a regulating valve, an expansion valve (pressure reducing device) 27 for hot water storage that is a flow rate regulating valve to which the other end of the primary flow path 22A is connected, an air heat exchanger 28, and an internal heat exchanger The 25 secondary flow paths 25B and the accumulator 29 are sequentially connected in a circular pipe.

  In the second hot water circulation path C2, one end of the water flow path 22B of the second water refrigerant heat exchanger 22 and the lower part of the hot water storage tank 31 are connected via a circulation pump 32, and the other end of the water flow path 22B and the hot water storage capacity. The thermistor 33 is connected to the upper part of the tank 31 and detects the temperature of the hot water flowing out from the water flow path 22B of the second water refrigerant heat exchanger 22 between the other end of the water flow path 22B and the upper part of the hot water storage tank 31. It is provided in the 2nd warm water circulation path C2.

  The hot water storage tank 31 is connected with a primary flow path 34 </ b> A for reheating water heat exchanger 34 through a circulation pump 35. A bathtub 37 is connected to the secondary flow path 34 </ b> B of the water heat exchanger 34 via a circulation pump 36. A hot water supply pipe 40 is connected to the upper part of the hot water storage tank 31, and a mixing valve 41 is provided in the hot water supply pipe 40. 42 is a water supply pipe provided with a pressure reducing valve 43 and connected to a water pipe. This water supply pipe 42 is branched and connected to the lower part of the hot water storage tank 31 and the mixing valve 41, and further via the replenishing water opening / closing valve 44. It is connected to the expansion tank 8.

  The hot water storage tank 31 is provided with a hot water temperature detection sensor 45. Since the boiling temperature is up to 85 ° C., there is residual hot water when the hot water temperature detected by the hot water temperature detection sensor 45 is 55 ° C. or higher. If the temperature is lower than 55 ° C., it is determined that the emergency is about to run out. At this time, the location where the hot water temperature detection sensor 45 is disposed is a position where the amount of remaining hot water that can be used is 50 liters, for example.

  When the room is warmed up, the floor heating panels 1 and 2 do not radiate much heat, and high temperature water of 50 to 60 ° C. is supplied from the expansion tank 8 to the first water refrigerant heat exchanger 9. The first water refrigerant heat exchanger 9 does not exchange much heat, the refrigerant temperature becomes high, and a high load is applied to the compressor 21. Therefore, the internal heat exchanger 25 is provided in addition to the first water refrigerant heat exchanger 9 as a cooling mechanism for the refrigerant having reached a high temperature. Since the heat radiation in the internal heat exchanger 25 is taken into the refrigerant after passing through the air heat exchanger 28 in the same refrigerant circuit R, the heat absorption efficiency of the refrigerant circuit R is also improved. Further, the thermistor 50 is for controlling the compressor 21 to be stopped in order to protect the compressor 21 when detecting that the refrigerant has reached a predetermined high temperature.

  Reference numeral 46 is a kitchen remote controller (hereinafter referred to as “kitchen remote control”), and 47 is a bath remote controller (hereinafter referred to as “bath remote control”).

  The heat pump unit A and the tank unit B are provided with printed circuit boards K1 and K2, respectively. The printed circuit board K1 is equipped with a control device (control means) S1 composed of a microcomputer, and the printed circuit board K2 has a timer. A control device (control means) S2 comprising a microcomputer to which T is connected is mounted.

  Next, in FIG. 2, the space in the heat pump unit main body 51 of the heat pump unit A is divided into left and right by a partition plate, and is roughly divided into the second water refrigerant heat exchanger 22 from below in the right space. The first water refrigerant heat exchanger 9 and the electrical box 54 for storing the printed circuit board K1 are disposed, and the internal heat exchanger 25 and the air heat exchanger 28 are disposed in the left space.

  55 is a hot water inlet joint for forming the second hot water circulation path C2 with the tank unit B provided on the back surface of the heat pump unit main body 51, and 56 is also a hot water outlet joint. Reference numeral 57 denotes a hot water inlet joint for forming the first hot water circulation path C1 with the tank unit B provided on the back surface of the heat pump unit main body 51, and 58 denotes a hot water outlet joint.

  Next, the first water refrigerant heat exchanger 9 will be described in detail with reference to FIGS. 3 to 5. The first water refrigerant heat exchanger 9 has a large diameter (large diameter) through which hot water for heating passes and is made of copper. A hot water pipe 63 formed of a pipe, and small diameter (small diameter) refrigerant pipes 64A and 64B that are inserted into the hot water pipe 63 and are configured by at least two copper thin pipes. Has been. The refrigerant pipes 64A and 64B are connected in parallel to each other, and as shown in FIG. 3, the first water refrigerant heat exchanger 9 is spirally wound so as to be generally hollow. It is formed in a cylindrical shape.

  The warm water pipe 63 has one end on the lower end side connected to the warm water going joint 57 via a warm water going pipe 60, and the other end on the upper end side via a hot water return pipe 67. It is connected to the warm water return joint 58, and the inside of the warm water pipe 63 constitutes a water flow path 9B of the first water refrigerant heat exchanger 9.

  On the other hand, the refrigerant pipes 64A and 64B connected in parallel with each other communicate with the compressor 21 via the first on-off valve 23 before the one end of each of the refrigerant pipes 64A and 64B branches. However, after joining, it communicates with the primary flow path 25A of the internal heat exchanger 25. The plurality of refrigerant pipes 64 </ b> A and 64 </ b> B constitute a refrigerant flow path 9 </ b> A of the first water refrigerant heat exchanger 9.

  In the first water-refrigerant heat exchanger 9, the refrigerant flow flowing in the refrigerant pipes 64A and 64B and the hot water flow flowing in the hot water pipe 63 are counterflows that flow in opposite directions.

  The control devices S1 and S2 are compressed according to the operation signals from the floor heating remote controllers 3 and 4, the bathroom heating remote controller 14, the kitchen remote controller 46, and the bath remote controller 47 and the temperature signals of the thermistors 12, 18, 33, and 50. The operation and frequency control of the machine 21, the operation control of the circulation pumps 7 and 32, the opening and closing control of the thermal valves 5, 6 and 16, the opening control of the expansion valves 26 and 27, etc. are described below. To do.

<Hot-water supply operation>
When an operation signal from the kitchen remote controller 46 or the bath remote controller 47 is input to the control device S2, the signal is transmitted from the control device S2 to the control device S1, and hot water is stored in the hot water storage tank 31. That is, the circulation pump 32 is operated by the control device S1, and in the second hot water circulation path C2, the hot water storage tank 31 → the circulation pump 32 → the water flow path 22B of the second water refrigerant heat exchanger 22 → the hot water storage tank 31 in this order. Hot water flows and the hot water is stored in the hot water storage tank 31.

  On the other hand, in the heat pump unit A, the control device S1 operates the compressor 21 to open the second opening / closing valve 24 and the hot water storage expansion valve 27. In the refrigerant circuit R, the compressor 21 → second opening / closing valve 24 → hot water storage. Refrigerant flow path 22A of the second water refrigerant heat exchanger 22 for hot water → expansion valve 27 for hot water storage → air heat exchanger 28 → secondary flow path 25B of the internal heat exchanger 25 → accumulator 29 → compressor 21 in this order. The refrigerant flows. At this time, since heating is not performed, the first on-off valve 23 and the heating expansion valve 26 are closed.

  The temperature of the hot water supplied to the hot water storage tank 31 is 65 ° C. to 85 ° C. The frequency of the compressor 21 is controlled so that the temperature detected by the thermistor 33 becomes this temperature, and the valve opening of the expansion valve 27 for hot water storage. Control is performed by the control device S1.

  The hot water stored in the hot water storage tank 31 is added with tap water of about 15 ° C. from the water supply pipe 42, adjusted to an appropriate temperature by the mixing valve 41, and filled with hot water from the hot water supply pipe 40 to the kitchen or bathtub 37. Used. When hot water is supplied, water is supplied from the water supply pipe 42 to the hot water storage tank 31. In addition, by operating the circulation pumps 35 and 36, the hot water in the hot water storage tank 31 and the hot water in the bathtub 37 are exchanged by the water heat exchanger 34 for replenishment, and the hot water in the bathtub 37 is replenished. You can also.

  In the case of the normal hot water supply operation as described above, the frequency control of the compressor 21 is performed so that the capacity of the compressor 21 of the heat pump unit A having the capacity of 9.0 kW becomes, for example, about 6.0 kW which is efficient. The valve opening control of the hot water storage expansion valve 27 is performed by the control device S1. However, if the amount of remaining hot water that can be used is 50 liters, the hot water temperature detected by the hot water temperature detection sensor 45 is less than 55 ° C., and it is determined that there is an emergency just before the hot water runs out, the compressor 21 of the heat pump unit A The control device S1 performs frequency control of the compressor 21 and control of the opening degree of the expansion valve 27 for hot water storage so that the capacity becomes 9.0 kW.

<Floor heating operation>
Next, when performing floor heating by the floor heating panel 1 or 2, the operation switch of the floor heating remote control 3 or 4 attached to the wall surface or the like of the room is turned on. Then, the control valve S2 that has received the operation signal gradually opens the corresponding thermal valve 5 or 6 and the circulation pump 7 operates. Therefore, until the thermal valve 5 or 6 is fully opened (until fully opened), the control device S2 controls the bypass valve 11 to be in a half-open state, for example.

  That is, since it takes a predetermined time for the thermal valve 5 or 6 to be fully opened after starting the opening operation, the time is set in the timer T, and the timer T determines the elapse of the set predetermined time. When the time is counted, the control device S2 controls the bypass valve 11 so as to be changed from the half-open state to the closed state.

  For this reason, the control device S2 controls the bypass valve 11 to be in a half-open state until the predetermined time elapses after the timer T starts counting, and in the first hot water circulation path C1, the expansion tank 8 The hot water flows in the order of the circulation pump 7, the water flow path 9 B of the first water refrigerant heat exchanger 9, the bypass valve (half-open state) 11, and the expansion tank 8.

  Then, when the timer T counts the set predetermined time, the control device S2 controls the bypass valve 11 so as to change from the half-open state to the closed state. Therefore, in the first hot water circulation path C1, the expansion tank 8 → the circulation pump 7 → the water flow path 9B of the first water refrigerant heat exchanger 9 → the thermal valve 5 or 6 → the floor heating panel 1 or 2 → the expansion tank 8 Hot water flows in sequence, and all of the hot water can be supplied to the floor heating panel 1 or 2.

  On the other hand, when the operation switch of the floor heating remote controller 3 or 4 is turned on, the compressor 21 of the heat pump unit A is operated by the control device S1 to which the operation signal is transmitted from the control device S2, and the first on-off valve 23 is In the refrigerant circuit R, the compressor 21 → the first on-off valve 23 → the refrigerant flow path 9A of the first water / refrigerant heat exchanger 9 for heating → the primary flow path 25A of the internal heat exchanger 25 → the expansion valve for heating The refrigerant flows in the order of 26 → air heat exchanger 28 → secondary flow path 25B of internal heat exchanger 25 → accumulator 29 → compressor 21. At this time, since hot water is not stored, the second on-off valve 24 and the hot water expansion valve 27 are closed, and no refrigerant flows through the primary flow path 22A of the hot water water refrigerant heat exchanger 22.

  The temperature of the hot water supplied to the floor heating panel 1 or 2 is 60 to 70 ° C., but the frequency control of the compressor 21 and the expansion for heating are performed so that the hot water temperature detected by the thermistor 12 becomes this temperature. The valve opening degree control of the valve 26 is performed by the control device S1.

  In the floor heating control, a room temperature thermistor (not shown) mounted on the floor heating remote controller 3 or 4 detects the room temperature, and controls the opening or closing of the thermal valve 5 or 6 based on the deviation between the set temperature and the room temperature. The control device S2 controls the amount of hot water to the panel 1 or 2.

  In addition, when floor heating is simultaneously performed on the floor heating panels 1 and 2, the operation valves of the floor heating remote controllers 3 and 4 are turned on to similarly control the opening and closing of the thermal valves 5 and 6, so that the floor heating panel 1 and Warm water is supplied to 2 and individual control of floor heating is possible by individually controlling the amount of warm water to the floor heating panels 1 and 2.

  When such a floor heating operation is performed, when the floor heating room is warmed, the amount of heat released from the floor heating panels 1 and 2 is reduced, and the expansion tank 8 to the water flow path 9B of the water refrigerant heat exchanger 9 50-60 degreeC warm water will be supplied. For this reason, the water refrigerant heat exchanger 9 does not exchange much heat, and the refrigerant temperature becomes high and a load is applied to the compressor 21. The internal heat exchanger 25 is provided as a cooling mechanism for the refrigerant in such a case, and the heat release in the primary flow path 25A of the internal heat exchanger 25 is two of the internal heat exchanger 25 in the same refrigerant circuit R. Since it is absorbed again by the next flow path 25B, the refrigerant circuit R can be configured without waste and without reducing efficiency.

<Bathroom heating operation>
Next, when performing hot air heating of the bathroom by the fan coil 13, the operation switch of the bathroom heating remote controller 14 is turned on. Then, the control device S2 opens the thermal valve 15 at the inlet of the fan coil 13 and controls the bypass valve 11 to be in a half-open state, thereby controlling the circulation pump 7 to operate. Accordingly, in the first hot water circulation path C1, the hot water flows in the order of the expansion tank 8, the circulation pump 7, the water flow path 9B of the first water refrigerant heat exchanger 9 for heating, the bypass valve 11 (half-open state), and the expansion tank 8. At the same time, the hot water flows in the order of the expansion tank 8 → the circulation pump 7 → the water flow path 9B of the first water-refrigerant heat exchanger 9 for heating → the thermal valve 15 → the fan coil 13 → the expansion tank 8.

  The operation of the heat pump unit A and the refrigerant circulation are the same as in the floor heating operation, and hot water is not stored. Therefore, the second on-off valve 24 and the thermal valve 27 are closed, and the primary flow path 22A of the water-refrigerant heat exchanger 22 is closed. Does not flow refrigerant.

  The temperature of the hot water supplied to the fan coil 21 is 80 ° C., and the hot water control for that is the same as in the floor heating operation. Further, the bathroom heating control by the control device S2 is performed by detecting the room temperature by a room temperature thermistor (not shown) mounted on the fan coil 13, controlling the fan rotational speed, and controlling the opening and closing of the thermal valve 15.

  In the case of floor heating operation or bathroom heating operation as described above, the frequency control of the compressor 21 is performed so that the capacity of the compressor 21 of the heat pump unit A having the capacity of 9.0 kW is, for example, about 7.0 kW. The valve opening control of the heating expansion valve 26 is performed by the control device S1.

<Simultaneous operation of floor heating and bathroom heating>
When floor heating by the floor heating panels 1 and 2 and bath room temperature heating by the fan coil 13 are performed simultaneously, the operation switches of the respective remote controllers 3, 4 and 14 are turned on. Then, the control valve S2 that has received the operation signal gradually opens the corresponding thermal valve 5 or 6 and opens the thermal valve 15 so that the circulation pump 7 operates. Therefore, the control device S2 controls the bypass valve 11 to be in a half-open state until the thermal valve 5 or 6 is completely opened, that is, until a predetermined time by the timer T elapses.

  For this reason, the control device S2 controls the bypass valve 11 to be in a half-open state until the predetermined time elapses after the timer T starts counting, and in the first hot water circulation path C1, the expansion tank 8 The hot water flows in the order of the circulation pump 7 → the water flow path 9B of the first water / refrigerant heat exchanger 9 → the bypass valve (half-open state) 11 → the expansion tank 8 and the expansion tank 8 → the circulation pump 7 → the first water for heating. Hot water flows in the order of the water flow path 9B of the refrigerant heat exchanger 9 → the thermal valve 15 → the fan coil 13 → the expansion tank 8.

  Then, when the timer T counts the set predetermined time, the control device S2 controls the bypass valve 11 so as to change from the half-open state to the closed state. Therefore, in the first hot water circulation path C1, the expansion tank 8 → the circulation pump 7 → the water flow path 9B of the first water refrigerant heat exchanger 9 → the thermal valve 5 or 6 → the floor heating panel 1 or 2 → the expansion tank 8 While warm water flows in order, the warm water flows in the order of the expansion tank 8 → the circulation pump 7 → the water flow path 9 </ b> B of the first water refrigerant heat exchanger 9 for heating → the thermal valve 15 → the fan coil 13 → the expansion tank 8.

  Although the hot water temperature control by the thermistor 12 at this time is 80 ° C., the temperature is too high as hot water for the floor heating panels 1 and 2. In order to solve this problem, the mixing heat valve 16 is opened to mix the warm water from the expansion tank 8 with the warm water at 80 ° C. so that the temperature of the warm water detected by the thermistor 18 is 60 to 70 ° C. I have control. Further, when the temperature of the medium temperature water becomes excessively low and the temperature becomes low, the mixing heat valve 16 is closed, and the control device S2 performs opening / closing control of the heat valve 16 based on the temperature detected by the thermistor 18.

  The operation of the heat pump unit A and the refrigerant circulation are the same as the floor heating operation or the bathroom heating operation, and no hot water is stored. Therefore, the second on-off valve 24 and the thermal valve 27 for hot water storage are closed, and the hot water storage water is stored. The refrigerant does not flow in the primary flow path 22A of the refrigerant heat exchanger 22.

  In the case of the simultaneous operation of floor heating and bathroom heating as described above, the frequency of the compressor 21 is set so that the capacity of the compressor 21 of the heat pump unit A having the capacity of 9.0 kW is, for example, about 7.0 kW. Control and control of the opening degree of the expansion valve 26 for hot water storage are performed by the control device S1.

  As described above, the first water-refrigerant heat exchanger 9 of the heat pump unit A has at least two narrow tubes connected in parallel with each other in a hot water pipe 63 made of a large-diameter copper pipe through which hot water for heating passes. Since the refrigerant pipes 64A and 64B with small diameters through which the refrigerant passes are inserted and formed into a hollow, generally rectangular tube as a whole, the heat conduction area of the refrigerant pipe is reduced. Heat exchange sufficient for hot water heating can be performed without reducing so much as compared with the prior art, and the first water refrigerant heat exchanger 9 can be made more compact. Since the length of the refrigerant pipe can be made shorter than before, the pressure loss of the refrigerant can be reduced, and the energy consumption efficiency (COP) can be increased.

  Although the embodiments of the present invention have been described above, various alternatives, modifications, and variations can be made by those skilled in the art based on the above description, and the various alternatives and modifications described above are within the scope of the present invention. Or a modification is included.

It is a whole system diagram of a heat pump type hot water supply and heating device. It is a side view of a heat pump unit in the state where a door was removed. It is a front view of the 1st water refrigerant heat exchanger. It is an expanded sectional view of the AA cross section of FIG. It is an expanded sectional view of the important section of the 1st water heat exchanger.

Explanation of symbols

7 Circulation pump (first circulation pump)
DESCRIPTION OF SYMBOLS 9 1st water refrigerant heat exchanger 9A Refrigerant flow path 9B Hot water flow path 21 Compressor 22 2nd water refrigerant heat exchanger 26 Expansion valve for heating 27 Expansion valve for hot water storage 31 Hot water storage tank 32 Circulation pump (2nd circulation pump) )
63 Hot water pipe 64A Refrigerant pipe 64B Refrigerant pipe A Heat pump unit B Tank unit C1 First hot water circulation path for hot water heating C2 Second hot water circulation path for hot water storage R Refrigerant circuit

Claims (2)

A compressor, a parallel circuit of a first water refrigerant heat exchanger for heating and a second water refrigerant heat exchanger for hot water storage, each connected to a decompressor, and a refrigerant circuit formed by sequentially connecting an air heat exchanger in an annular shape A heat pump unit comprising: an expansion tank; a first hot water circulation path for circulating hot water for heating by operating a first circulation pump between the first water refrigerant heat exchanger and the hot water heating device; and the second water A heat pump type hot water supply and heating device comprising a tank unit having a second hot water circulation path for circulating hot water between a refrigerant heat exchanger and a hot water storage tank by a second circulation pump,
The first water refrigerant heat exchanger for heating is configured by inserting a plurality of small-diameter refrigerant pipes through which refrigerant passes into a large-diameter hot water pipe through which hot water for heating passes, and in a spiral shape. A heat pump hot water supply and heating device characterized by being wound.   The heat pump hot water supply / room heating apparatus according to claim 1, wherein the plurality of refrigerant tubes inserted into the hot water tubes are configured by at least two narrow tubes connected in parallel to each other.

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