KR100563178B1 - Heat pump type hot water supplier - Google Patents

Abstract

Conventional heat pump water heaters boil and store only the total amount of hot water used during the day with electric power at night, thus requiring a large storage tank, or depleting hot water and lowering the temperature of the hot water.

A compressor, a water-refrigerant heat exchanger for performing heat exchange between water and a refrigerant, a pressure reducing device, a heat pump refrigerant circuit connected in turn via a refrigerant pipe, and a water pump and a water-refrigerant heat exchanger. A water supply member has a heat pump hot water supply circuit connected to the water supply source and the water-refrigerant heat exchanger, and the water-refrigerant heat exchanger and the hot water supply member are connected to a hot water supply pipe. The refrigerant heat exchanger tube through which the refrigerant from the pump refrigerant circuit flows and the water heat exchanger tube through which the water from the heat pump hot water supply circuit flows are heat-exchanged, and a plurality of water heat transfer tubes are provided between the water supply pipe and the hot water supply pipe.

Compressor, decompression device, refrigerant pipe, hot water pipe, heat exchanger, heat pipe, hot water heater

Description

Heat Pump Water Heater {HEAT PUMP TYPE HOT WATER SUPPLIER}

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic diagram showing one embodiment of a schematic configuration of a heat pump refrigerant circuit, a low temperature hot water circuit, and components in a heat pump water heater of the present invention.

2 is a structural diagram of a water-refrigerant heat exchanger showing an embodiment of the present invention.

Figure 3 is a structural diagram of a bath heat exchanger showing an embodiment of the present invention.

Fig. 4 is a flowchart showing one embodiment of the installation and auxiliary tank boiling operation in the heat pump water heater of the present invention.

Fig. 5 is a flowchart showing one embodiment of operation in using hot water in the heat pump water heater of the present invention.

Fig. 6 is a flowchart showing one embodiment of an operation when supplying bath hot water in a heat pump water heater of the present invention and when bath is further heated.

Fig. 7 is a flowchart showing one embodiment of bath additional heating by automatic bath operation.

<Explanation of symbols for the main parts of the drawings>

1a, 1b: compressor

2: water-refrigerant heat exchanger

2a, 2b: refrigerant heat transfer tube

2c: water supply pipe

2d: hot water supply piping

2e, 2f: water feed tube

3a, 3b: decompression device

4a, 4b: evaporator

5a, 5b: Defrost solenoid valve

6: water supply member

7: pressure reducing valve

8: bypass valve

9: auxiliary tank

10: tank circulation pump

11: heat exchange control valve

12: tank flow control valve

13: tapping member

14: bath pouring valve

15: bath sensor member

16: bath tapping member

17: no hot water tap

18: Bathtub

19: bath circulation pump

20: bath heat exchanger

20a: hot water heat pipe

20b: bath water heat pipe

21: water opening and closing valve

22: bath check valve

23: water supply check valve

24: relief valve

30: heat pump refrigerant circuit

40: hot water circuit

50: driving control means

51: kitchen clicker

52: Bath Clicker

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump water heater, and more particularly, to a heat pump water heater having an instantaneous hot water supply function of directly supplying water heated by a water-refrigerant heat exchanger to a water use terminal.

Conventional heat pump water heaters are equipped with a large-capacity storage tank, similar to an electric water heater, and boils hot water in a heat pump refrigerant circuit at night using a low-cost discount power at night, and stores the stored hot water in the storage tank. It was common to use during the day.

However, in the hot water supply method, since the amount of hot water in the storage tank is constant, the amount of hot water is insufficient on days where the amount of water is used, and there is an energy loss due to the cooling of the remaining hot water on the day of the amount of usage.

In addition, in the case of bathing, after the hot water is supplied to the bath, additional heating due to hot water cooling is required, but in the conventional hot water heater system, since only one-sided hot water replenishment function from the hot water tank is available, proper response could not be achieved.

As a countermeasure for the above, there is one disclosed in Japanese Laid-Open Patent Publication No. 2003-56904 (Patent Document 1) as a heat pump hot water heater with an additional heating function.

The heat pump water heater described in Patent Literature 1 circulates through a heat pump circuit having a refrigerant-water heat exchanger, which is compressed to a high temperature and high pressure by a compressor, and heat is transferred from the refrigerant in the heat pump circuit to water to warm the water. Lose. The warmed water circulates through the bottom tank or through a water-water heat exchanger where the water in the bath circulates. As the heated water circulates through the storage tank, the water of the storage tank is boiled. In addition, by circulating the heated water in the water-water heat exchanger, the cooling of the bathtub further heats the hot water.

That is, since water can be heated to about 90 DEG C in a water-refrigerant heat exchanger by using carbon dioxide as a refrigerant, it is disclosed that not only the water boiling of the boiling water tank but also the additional heating of the bath is performed by the heat pump circuit.

[Patent Document 1]

Japanese Patent Laid-Open No. 2003-56904

In the heat pump water heater disclosed in Patent Document 1, when the faucet is opened, water is supplied from the tap water to the lower portion of the water storage tank, and the hot water is pushed out of the water storage tank by the water and mixed with cold water of the water supply by the mixing valve. And hot water at an appropriate temperature.

That is, the heat pump water heater of patent document 1 performs a heat pump operation only at night, stores a high temperature water in a storage tank, and does not perform a heat pump operation after that, even if it is the hot water of one tank of a storage tank It is to supply both hot water supply of bath, water supply of sink, kitchen and so on.

Therefore, a large thing of 300-450 L is used for an actual water storage tank. When CO ₂ refrigerant is used, hot water at 90 ° C. can be heated, but the energy loss due to natural heat dissipation increases because of high temperature.

Such a large-capacity storage tank needs sufficient strength of an installation space or an installation floor surface. Because if the hot water is stored in a full capacity of the storage tank, the mass reaches 500 kg, so it is necessary to secure a sufficient strength by laying the foundation of the installation site, and insufficient space or strength such as an apartment or a balcony of the apartment. It becomes difficult to install in one place. Alternatively, when the heat pump type hot water heater is transported to the installation site of the customer, the cost and time are very high.

In addition, the heat pump is operated at night with the electric charge set at night, and the hot water is stored in the storage tank with hot water at a high temperature, and the hot water stored in the storage tank is used without using the heat pump in principle during the day. Do the method.

In this case, all of the hot water in the storage tank was used, and hot water was depleted without boiling immediately. In addition, since a large amount of hot water at a temperature higher than the ambient temperature is stored for a long time, heat is radiated from the large surface of the water storage tank, resulting in energy loss, and accordingly, it is necessary to allow the temperature to decrease and to warm it at night.

Therefore, although the heat pump water heater of patent document 1 has the cost advantage by the night discount rate, the subject remained in the point of energy saving and global warming.

Therefore, as a solution to save energy and prevent global warming in the heat pump water heater, there is a instantaneous hot water supply system that supplies the required amount of hot water when needed without storing hot water as much as possible. However, in order to realize the instantaneous hot water type heat pump apparatus, it is necessary to heat the unheated constant in a very short time, and there are problems such as increasing the capacity of the compressor and increasing the heat transfer capacity of the water-refrigerant heat exchanger. Among them, if the water heat pipes with flowing water are thinned or lengthened to increase the heat transfer capacity when tapping with water pressure of tap water, the pressure loss in the water heat pipes is increased and sufficient water pressure is not obtained at the time of tapping. Found.

SUMMARY OF THE INVENTION An object of the present invention is to provide a heat pump water heater excellent in energy saving and global warming prevention by solving the above problems.

In order to achieve the above object, the heat pump water heater of the present invention is a heat connected to the compressor and the water-refrigerant heat exchanger for heat exchange between the water and the refrigerant, the decompression device, the evaporator for heat exchange between the air and the refrigerant in turn via a refrigerant pipe A heat pump having a pump refrigerant circuit, a water supply source and the water-refrigerant heat exchanger and a tapping member, wherein the water supply source and the water-refrigerant heat exchanger are connected to a water supply pipe, and the water-refrigerant heat exchanger and a tapping member are connected to a hot water supply pipe. And a water-cooling heat exchanger, wherein the water-refrigerant heat exchanger is installed at a position where the refrigerant heat-transfer tube through which the refrigerant from the heat pump refrigerant circuit flows and the water heat-transfer tube through which the water from the heat pump hot water supply circuit flows. By installing a plurality between the water supply pipe and the hot water supply pipe, there are at least two water heat transfer tubes on the water supply side. Since the heating area by the heat pipe doubles, the length of the water heat pipe can be reduced to 1/2, making the water heat exchanger smaller, and the pressure loss when water flows through the water heat pipe can be 1/4. It is possible to improve the efficiency and to reduce the pressure loss of the water heat transfer pipe, and to realize the instant hot water supply method of directly tapping hot water heated by the water-refrigerant heat exchanger.

In addition, the heat pump water heater of the present invention further has a structure in which the refrigerant heat pipe and the water heat pipe of the water-refrigerant heat exchanger are made of metal pipes, alternately contacted, and wound in a cylindrical shape, so that both sides of each water heat pipe are connected to the refrigerant heat pipe. By contact, heat transfer can be improved. Alternatively, a smooth flow of water can be ensured without a change in the inner diameter dimension or a 90 degree bending, or a compact heat exchanger can be used.

In addition, the heat pump hot water supply machine of the present invention is provided with an auxiliary tank in the above-described configuration, by installing a sub tank hot water supply circuit for heating the hot water boiled in the auxiliary tank by the heat pump hot water supply circuit and mixing the hot water with hot water. By providing a hot water supply circuit and two hot water supply circuits, the hot water accumulated in the auxiliary tank immediately after the start of the heat pump operation can be supplied to compensate for the shortage of water supply heating at the start of operation.

In addition, when there is a large amount of water to be heated in winter or in a shower or the like, the heat pump hot water supply circuit and the auxiliary tank hot water supply circuit can be used simultaneously to cope with it, and a small auxiliary tank can handle a large function.

In addition, the heat pump water heater of the present invention has the above-described configuration, and the heat pump refrigerant circuit is a two-cycle system having two compressors, a decompression device, and two evaporators, and the water-refrigerant heat exchanger is shared to allow each refrigerant heat pipe. It was attached integrally to the refrigerant heat exchanger and had many problems in that the entire heat pump cycle had to be enlarged in order to perform hot water supply in the past. Another effect is that it can be hot water as it is.

Hereinafter, an embodiment of the present invention will be described with reference to Figs. The heat pump water heater shown in FIG. 1 is comprised with the heat pump refrigerant circuit 30, the hot water supply circuit 40, and the operation control means 50. As shown in FIG.

The heat pump refrigerant circuit 30 has two refrigeration cycles. In each cycle, compressors 1a and 1b, condensers 2a and 2b, decompression devices 3a and 3b and evaporators 4a and 4b are connected in turn via refrigerant pipes, and refrigerant is sealed during each cycle. It is.

The compressors 1a and 1b which enable the capacity control are operated with a large capacity when a large amount of hot water is supplied. The compressors 1a and 1b are driven by high speed rotation (eg 8000 revolutions) from low speed rotation (eg 2000 revolutions per minute) by PWM control, voltage control (eg PAM control) and combination control thereof. Revolutions per minute).

The water-refrigerant heat exchanger (2) includes coolant side heat transfer tubes (2a, 2b) and water supply side heat transfer tubes (2e, 2f) that are condensers in a refrigeration cycle. For example, the structure mentioned later heat-exchanges between refrigerant | coolant side heat exchanger tubes 2a and 2b and water supply side heat exchanger tubes 2e and 2f.

Evaporators 4a and 4b are air-refrigerant heat exchangers that exchange heat between air and refrigerant.

The defrosting solenoid valves 5a and 5b are on / off valves that open while energizing the provided electromagnetic coil. The solenoid valves 5a and 5b bypass the high temperature and high pressure refrigerant gas discharged from the compressors 1a and 1b to the inlet side of the evaporators 4a and 4b. When the evaporators 4a and 4b are frosted in winter, the solenoid valves 5a and 5b open the on / off valves, so that the high temperature and high pressure refrigerant gas discharged from the compressors 1a and 1b flows into the evaporators 4a and 4b. It enters through the refrigerant pipe and functions to melt frost.

The hot water supply circuit 40 is provided with the structure which implements the water circulation circuit which is needed for performing water storage, hot water supply, bath hot water supply, bath additional heating, etc., respectively by switching a pipe line.

The heat pump hot water supply circuit is a hot water supply circuit mainly composed of the heat pump water heater of the present embodiment. The constant blown in from the water supply member 6 at the connection with the tap water is reduced in pressure by the pressure reducing valve 7 and is transferred to the bypass valve 8. The bypass valve 8 is a proportional valve capable of draining not only to the water-refrigerant heat exchanger 2 or the auxiliary tank 9 but also to the branch pipe 2i for temperature control of the hot water to be heated. The constant passing through the feedwater check valve 23 from the bypass valve 8 is warmed in the feedwater heat transfer pipes 2e and 2f through the feedwater pipe 2c. The warmed water is hot-watered out of the heat pump water heater from the tapping member 13 connected to the hot water supply pipe 2d via the hot water supply pipe 2d via the heat exchange flow rate adjusting valve 11 on the way. Each structure is connected in order via the water piping.

The tank hot water supply circuit includes a sub tank 9, which is composed of a small-capacity tank having a cylindrical shape and a vertical length, and is 1/3 to 1/3 of the water tank provided in a conventional water heater type hot water heater. It's a small tank about 1 / 5th. And when the temperature of the hot water supplied by the heat pump hot water supply circuit is low, the auxiliary tank 9 stores the hot water of some high temperature which can be mixed with the hot water from a heat pump hot water supply circuit.

Specifically, the hot water stored in the auxiliary tank 9 flows out to the tapping pipe 2d through the branch pipe 2h by opening the tank flow control valve 12. At this time, the hot water is discharged from the auxiliary tank (9), in which the constant supplied through the water supply member (6) is accompanied with water pressure adjusted through the water pipe via the pressure reducing valve (7) and the bypass valve (8). This is because it is injected into the tank 9.

The water storage circuit used when storing water in the auxiliary tank 9 is constructed between the auxiliary tank 9 and the water-refrigerant heat exchanger 2. That is, the tank flow control valve 12 connected with the branch pipe 2h branched from the tapping pipe 2d is opened, and the tank circulation pump 10 draws out water from the lower part of the auxiliary tank 9. The extracted water is heat-exchanged in the feedwater heat pipes 2e and 2f after passing through the feedwater pipe 2c. The hot water through the hot water supply pipe 2d is led to the auxiliary tank 9 through the heat exchange flow rate adjusting valve 11 and the tank flow rate adjusting valve 12. This water storage circuit is also used when reheating the hot water in the auxiliary tank 9, in other words, further heating the hot water in the auxiliary tank 9.

In the bath hot water supply circuit for supplying hot water to the bath, the basic configuration is the same as that of the heat pump hot water supply circuit, and instead of tapping hot water from the tapping member 13, hot water is supplied to the branch pipe 2j branched from the tapping pipe 2d. Drained. Hot water is injected into the bath 18 which passes through the bath sensor member 15 and connects with the bath tapping member 16 by opening the bath pouring valve 14 connected to the branch pipe 2j. . Naturally, when supplying hot water to the bathtub 18, the bathtub from the auxiliary tank 9 in a range such that the amount of hot water in the auxiliary tank 9 does not fall below the minimum required amount together with the direct hot water supply from the water-refrigerant heat exchanger 2. The auxiliary tank hot water supply to (18) is performed.

The bath additional heating circuit that warms the hot water in the bath 18 again is the water pipe between the bath 18 and the water-water heat exchanger 20. The water drawn out from the bath 18 to the bath circulation pump 19 through the hot and cold water member 17 is transferred to the bath heat pipe 20b, heated by heat exchange, and passed through the bath sensor member 15. After the temperature is measured, it is supplied to the bath 18 through the bath member 16.

Next, control of the heat pump water heater in the present embodiment will be described. The operation control means 50 of the heat pump hot water heater controls the operation and stop of the heat pump refrigerant circuit 30 and the rotation speed control of the compressors 1a and 2b by the operation settings of the kitchen remote control 51 and the bath remote control 52. At the same time, the operation and stop of the tank circulation pump 10, the bath circulation pump 19, and the bypass valve 8, the heat exchange flow rate adjustment valve 11, the tank flow rate adjustment valve 12, the pouring solenoid valve (14) By controlling the water open / close valve 21, the hot water operation, the hot water supply operation, the bath hot water supply operation, and the additional heating operation are performed.

It is preferable to control the operation control means 50 to operate at a high speed higher than the normal hot water operation speed so as to shorten the heating start time immediately after the operation of the heat pump circuit starts. Moreover, after using hot water supply in a tapping terminal, it has a water storage operation function which stops operation after performing tank water storage operation.

Next, another control related device provided in the heat pump water heater in the present embodiment will be described. Similarly to detecting the hot water supply temperature to the bath 18 by the bath sensor member 15, the temperature state such as the water heated by the water-refrigerant heat exchanger 2 or the water accumulated in the auxiliary tank 9, and the hot water to be heated And a temperature sensor for detecting the temperature state of the other parts, a pressure sensor for detecting the discharge pressure of the compressors 1a and 2b, and a water level sensor for detecting the water level in the bath 17 (all not shown), Each detection signal is input to the driving control means 50. The driving control means 50 controls each device based on these signals.

The water open / close valve 21 is located at a connection position with a branch pipe 2g branched from the hot water supply circuit, and is provided at a position between the water-refrigerant heat exchanger 2 and the bath heat exchanger 20. Outside the bath further heating, the water circuit to the bath heat exchanger 20 is closed to prevent heat leakage from the water-refrigerant heat exchanger 2 to the bath heat exchanger 20. For example, if this water opening / closing valve 21 is not provided and the tapping pipe 2d of the hot water supply circuit and the bath heat exchanger 20 which is a water-water heat exchanger are continuous through the water in the pipeline, the hot water supply circuit Since water continues continuously even if water does not flow into the branch pipe 2g, heat leakage advances from the bath heat exchanger 20. Similarly, in the branch pipes 2h, 2i, and 2j branching off from the tapping pipe 2d, the tank flow control valve 12, the bypass valve 8, and the bath pouring valve 14 connected in front of these are as necessary. The heat leakage at the time of hot water becomes very small by the pipe structure which opens and closes.

In addition, the bath check valve 22 and the water supply check valve 23 respectively flow water in only one direction and prevent backflow. The same function is required for the bath pouring valve 14. That is, although the constant or constant water is warmed up to the branch pipe 2j, there is water in the bath 18 in front of the bath pouring valve 14, and water in the bath 18 is mixed upstream of the branch pipe 2j. It should not be.

The relief valve 24 operates when the running pressure in the auxiliary tank becomes a predetermined value or more to function as a device protection against the pressure.

An embodiment of the water-refrigerant heat exchanger 2 is described with reference to FIG. The water-refrigerant heat exchanger (2) has two refrigerant heat pipes (2a, 2b), two water feed pipes (2e, 2f) and alternately contacts the refrigerant heat pipes (2a, 2b) and the water feed pipes (2e, 2f). It is a structure wound up into a cylindrical shape.

The feed water heat pipes 2e and 2f are located in the water-refrigerant heat exchanger 2, and feed water pipes 2c through which water blown in through the feed water member 6 or water from the auxiliary tank 9 pass, and water- It is a parallel pipeline divided into two between tapping pipes 2d through which the water heated by the refrigerant heat exchanger 2 passes. Compared with one case, the water passage area of the feed water heat transfer pipes 2e and 2f and the contact area with the refrigerant heat transfer pipes 2a and 2b are doubled, so that the respective lengths can be 1/2, so that water flow is achieved. The internal resistance at the time can be reduced to 1/4. Therefore, the internal pressure loss of the water-refrigerant heat exchanger 2 at the time of water passing becomes 1/4 compared with one case, and the whole height can be made low, and manufacture and storage are easy.

In particular, when instantaneous hot water supply such as instantaneous hot water supply using gas is performed using a heat pump, the water circulation is to be performed by the water pressure of the water supply source. However, the internal pressure loss of the water-refrigerant heat exchanger 2 becomes a resistance at the time of direct water flow and becomes negative in tapping pressure. For example, when the water pressure is 200 kPa, in the conventional water-refrigerant heat exchanger, if there is a pressure loss of 100 kPa, the tapping pressure is 100 kPa, and there is a fear that the water pressure drops and the tapping amount is insufficient. However, in the case of the water-refrigerant heat exchanger 2 in this embodiment, since the pressure loss is 25 kPa, which is 1/4, the tapping pressure is 175 kPa, and sufficient water pressure and tapping amount can be maintained. In a heat pump water heater for directly heating a constant water having a function of additionally heating water in a bathtub by a heat pump, the structure of the water-refrigerant heat exchanger 2 of the present embodiment is suitable for heat-exchanging water and refrigerant. The heat exchange efficiency of the water-refrigerant heat exchanger is further increased by separating the bath-exchanging heating exchanger from the water-refrigerant heat exchanger.

Next, an embodiment of the heat exchanger 20 for bath addition heating will be described with reference to FIG. The heat exchanger 20 for bath addition heating has a double tube structure, and the space 20c partitioned by the bath water heat exchanger tube 20b is provided inside the hot water heat exchanger tube 20a which used the copper tube. Hot water heated by the water-refrigerant heat exchanger 2 flows through this space 20c by hot water pipes 20d connected to both end sides of the hot water heat transfer pipe 20a. The bath water heat pipe 20b in which the hot water flows in the bathtub is connected to the bath water pipe 20e leading out from both ends 20f of the hot water heat pipe 20a. The hot water heat exchanger tube 20a is a generally used copper tube, and both ends 20f thereof are throttled and joined to the outside of the bath water pipe 2e to be sealed. The bath water heat pipe 20b has a circumferential circumference in an uneven shape, a star shape, or a multileaf pipe so as to obtain a large contact area with hot water. The hot water pipe 20d opens inside both ends of the hot water heat transfer pipe 20a and is in communication with the space 20c through which the hot water flows.

As the heat exchanger 20 for bath addition heating is made into a double tube structure as mentioned above, the bath water heat exchanger tube 20b which the water in the bathtub 18 which is a to-be-heated body flows is provided in the distribution space of the hot water which is a heating body. Therefore, the bath heat transfer heat exchanger 20 can be made into the water-water heat exchanger in which the bath water heat exchanger tube 20b is heat-transmitted in the whole outer periphery, and is compact and heat-transfers good.

In addition, in the conventional heat exchanger for additional heating of the bath, since the heat exchanger is exchanged between the refrigerant heat pipe and the bath water heat pipe, if the inner pipe is broken, the high pressure refrigerant may enter the water circuit and affect the constant water system in the hot water heater. The double pipe structure in which one pipe penetrates the other inside cannot be adopted, and as shown in FIG. 2, the refrigerant pipe and the water pipe had to be independent pipe structures.

In addition, the bath addition heating heat exchanger 20 considers the following point. That is, impurities may be contained in the circulating water of the bath water. If this bath water flows through the space 20C side, impurities may be caught by unevenness on the surface of the tube, which may cause clogging. Therefore, in this embodiment, hot water via the water refrigerant heat exchanger 2 flows into this space 2C.

That is, in the embodiment of the present invention, the double tube structure is adopted by separating the bath additional heating heat exchanger 20 and the water-refrigerant heat exchanger 2 and heat-exchanging the water and water of the heating circulation water and the bath circulation water. This is possible.

With the above-described configuration, the heat pump water heater in the present embodiment starts the heat pump operation at the same time as the start of hot water supply use, and enables the hot water boiled by the water-refrigerant heat exchanger 2 to be directly supplied to the tapping terminal, In addition, the hot water of the bath 18 is further heated by a bath heat exchanger 20 having a double tube structure to obtain an energy saving and warming prevention effect.

Next, the operation of the heat pump water heater will be described based on the flowcharts of FIGS. 4 to 7 with reference to the heat pump circuit 30 and the hot water supply circuit 40 of FIG.

4 is an embodiment of a flowchart showing the operation operation at the time of installation. When the heat pump water heater is transported from the manufacturing site and installed at the installation site desired by the user (step 60), the water supply member 6 is connected to a water supply source such as water supply and the opening and closing device of the water supply source is opened (step 61). Water supply is started from the source (step 62), and the water is regulated to a certain pressure by the pressure reducing valve 7, and then flows into the water storage tank 9 and the water-refrigerant heat exchanger 2 and the respective water pipes and is in full water. Water supply is continued until it reaches (step 63).

Moreover, at the time of installation of a heat pump water heater, each apparatus is set to the following initial states. The bypass valve 8 has the auxiliary tank 9 side open and the branch pipe 2i side on the tapping member 13 side closed, the heat exchange flow rate regulating valve 11, the tank flow rate regulating valve 12. , The water open / close valve 21 is in an open state, and the bath pouring valve 14 is in a closed state.

Next, when full water is confirmed in step 63, it is determined that water supply is completed and the power switch is turned on (step 64). Then, the operation of the heat pump refrigerant circuit 30 and the hot water supply circuit 40 is started by the control of the operation control means 50, and tank bottom water operation is performed (step 65). In this tank bottom water operation, the operation of the compressors 1a and 1b is started, and the gaseous refrigerant in the compressors 1a and 1b is compressed and heated to become a high temperature and high pressure refrigerant and transferred to the water-refrigerant heat exchanger 2.

As a result, in the water-refrigerant heat exchanger 2, since the hot refrigerant flowing in the refrigerant heat pipes 2a and 2b and the water flowing in the water feed heat pipes 2e and 2f exchange heat, the refrigerant heats up and the water is heated. The heat-dissipated refrigerant is depressurized by the decompression devices 3a and 3b, expanded and evaporated in the evaporators 4a and 4b to be gaseous, and then returned to the compressors 1a and 1b. By continuing this heat pump operation, the water passing through the water-refrigerant heat exchanger 2 is heated.

In the tank bottom water operation, the operation of the tank circulation pump 10 is started in the bottom water circuit together with the heat pump operation, and the water drawn out from the lower passage of the auxiliary tank 9 is stored in the tank circulation pump 10, the water-refrigerant. The heat exchanger 2, the heat exchange flow rate regulating valve 11, and the tank flow rate regulating valve 12 pass through the auxiliary tank 9.

As a result, when the hot water heated by the water-refrigerant heat exchanger 2 is heated at the upper portion of the auxiliary tank 9, and the entire auxiliary tank 9 reaches a boiled state, it is determined that the boiling water is completed (step 66). Stop (step 67).

In addition, tank fullness determination detects a water level state with a water level sensor, a pressure sensor, etc., for example, and a water-treatment completion determination is determined by detecting the water temperature of the upper and lower part of the auxiliary tank 9 with a thermistor, for example. (Not shown).

Fig. 5 is an embodiment of a flowchart showing the operation when using hot water.

When the tap is opened at the tapping terminal and hot water is used (step 70), the operation control means 50 starts the compressors 1a and 1b to start the operation of the heat pump circuit 30, and at the same time, the water supply member 6 , Hot water supply by the hot water supply circuit of the pressure reducing valve (7), the bypass valve (8), the water supply check valve (23), the water-refrigerant heat exchanger (2), the heat exchange flow rate adjusting valve (11), and the tapping member (13). Operation (step 71) is performed. At the same time, the tank hot water supply operation is performed by the hot water supply circuit of the water supply member 6, the pressure reducing valve 7, the bypass valve 8, the water storage tank 9, the tank flow rate adjustment valve 12, and the hot water supply member 13. (Step 77).

Here, the heat pump refrigerant circuit 30 feeds the high temperature refrigerant compressed by the compressors 1a and 1b to the water-refrigerant heat exchanger 2, and heats the water flowing from the water supply pipe 2c to supply the hot water supply piping 2d. ), But the water supplied to the water-refrigerant heat exchanger (2) does not become sufficiently high temperature and high pressure at the start of operation, and the temperature is low, and since the whole water-refrigerant heat exchanger (2) is cooled, the water is heated. Not enough heating capacity. As time passes, the refrigerant becomes hot and high pressure, thereby increasing the heat of condensation refrigerant generated thereby increasing the heating capacity for water.

However, the time until the heating capability of the heat pump operation reaches the high temperature stable state usually takes about 5 to 6 minutes. Thus, the operation control means 50 controls the operation of the compressor at a higher speed than normal until it reaches a high temperature stable state immediately after the start of operation, and a plurality of the aforementioned water heat transfer tubes in the water-refrigerant heat exchanger 2. By the synergistic effect of installing furnaces in parallel, in this embodiment, the vertical rise time can be about 1 to 2 minutes. In addition, it is possible to achieve a sufficient miniaturization of the auxiliary tank for storing the required hot water until the heat pump circuit is stabilized, and to realize the instant hot water supply method using the heat pump.

After the tank hot water supply operation for supplying hot water from the auxiliary tank for a predetermined time (approximately 1 to 2 minutes) immediately after the start of operation, the operation control means 50 is operated and the tank hot water supply operation is stopped to switch to only the instant hot water operation. (Steps 72, 78, 79). The tank hot water judgment in this step 78 may be determined based on the temperature of the hot water actually flowing through the hot water supply pipe 2d, in addition to measuring the operation time of the heat pump circuit.

In this way, excessively hot water is supplied from the auxiliary tank 9 only at the start of operation, and after that, hot water heated by the water-refrigerant heat exchanger 2 is directly heated. In addition, the capacity of the auxiliary tank 9 can be made considerably smaller than in the related art. In addition, the capacity of the auxiliary tank 9 is increased by raising the heating capability of the water-refrigerant heat exchanger 2 to a stable state as soon as possible, and shortening the time of the transient tank hot water operation using the hot water of the auxiliary tank 9. Make it even smaller.

To this end, it is desirable to increase the capacity of the heat pump refrigerant circuit 30, in particular the compressor output, to about 15 kPa, which is more than three times more than about 5 kW conventionally used, but it is not only necessary to develop a new compressor, but also to heat It is very difficult because all the components of the pump refrigerant circuit 30 need to be newly reviewed. Therefore, in one embodiment of the present invention, as described above, a two-cycle heat pump system using two compressors is used, and the reliability of the conventional technology and the performance is ensured.

In addition, the operation control means 50 stops the tank hot water supply operation when the remaining hot water amount of the auxiliary tank 9 becomes equal to or less than the predetermined value, and performs only the instant hot water operation (steps 78 and 79).

Next, when the use of the hot water ends and the tap of the tapping terminal is closed (step 80), when the tank hot water supply operation and the heat pump hot water supply operation are performed immediately after the hot water use, both the heat pump hot water operation and the tank hot water operation are stopped. . The tank hot water supply operation is stopped and the hot water hot water operation is stopped only by the heat pump hot water operation (steps 73 and 79).

Further, the operation control means 50 stops both the tank hot water supply operation and the heat pump hot water supply operation, and always starts the tank hot water operation (step 74), detects the completion of the hot water drop by a thermistor or the like and determines the completion of the hot water drop (step). 75) After that, the operation ends (step 76).

However, the detection of the tank bottom condition by the thermistor is always performed, and when the hot water temperature and the amount of hot water remain in the auxiliary tank almost equal to the bottom completion state even after the heat pump hot water operation stops for a very short time, the bottom is completed. It is determined that tank storage operation is not performed.

According to the above, since the operation control means 50 has a water storage operation function which performs tank storage every time after completion | finish of the operation for all operations, by all means until completion of water storage, the water storage tank always has hot water of predetermined temperature. Is full, and the concern about the fall of the warm water temperature at the time of driving start-up, and the exhaustion of warm water during use can be eliminated.

6 is a flowchart showing an embodiment of a hot water supply operation by automatic bath operation. The bath automatic button is pressed to turn it on (step 85), and when the set time is reached, the tank water supply operation is performed simultaneously with the bath hot water operation (step 87) (step 92). Bath hot water supply operation is performed by the heat pump hot water operation described in FIG. 5 to hot water the bath tub 18.

That is, during two minutes immediately after the start of the heat pump operation, the bath hot water supply operation and the tank hot water operation are simultaneously performed, and when the bath hot water temperature reaches a stable state, the tank hot water operation is stopped (steps 93 and 94). do. In addition, during the hot water supply operation, the bath hot water temperature and the amount of hot water in the bathtub are continuously detected, and the hot water supply operation is stopped when the hot water at the predetermined temperature reaches the predetermined hot water amount (steps 89, 90, and 91).

Fig. 7 is a flowchart showing one embodiment of bath additional heating by automatic bath operation. When the bath automatic button is turned on (step 95), after the hot water supply, the hot water temperature and the hot water amount in the bath are detected every predetermined time (for example, 30 minutes) (step 96), and the hot water temperature or the hot water amount is a predetermined value. If it is outside, the bath additional heating operation (step 97) is performed, the hot water temperature and the hot water amount are kept within predetermined values, and the bath operation is stopped (steps 98 to 101).

As described above, according to the present invention, the hot water supply method can be realized by the heat pump method by operating when necessary and supplying only the required amount of hot water at the required temperature. In addition, it is possible to significantly reduce the size of the storage tank and to save energy.

Claims (7)

A water-cooling heat exchanger, a pressure reducing device, an evaporator for heat-exchanging air and a refrigerant, and a heat pump refrigerant circuit connected in sequence through a refrigerant pipe; A water supply source and the water-refrigerant heat exchanger and a tapping member, the water supply source and the water-refrigerant heat exchanger are connected to a water supply pipe, and the water-refrigerant heat exchanger and the tapping member are provided with a heat pump hot water supply circuit connected to the hot water supply pipe. , The water-refrigerant heat exchanger is installed at a position where the refrigerant heat pipe through which the refrigerant from the heat pump refrigerant circuit flows and the water heat pipe with water from the heat pump hot water supply circuit exchanges heat, and the water heat pipe includes the water supply pipe and the hot water supply pipe. A plurality of heat pump water heaters are provided in between. The water-refrigerant heat exchanger of claim 1, wherein the refrigerant heat exchanger tube and the water heat exchanger tube of the water-refrigerant heat exchanger are formed of metal pipes, and each tube is installed in an alternating contact. And the coolant heat exchanger tube and the water heat transfer tube are formed in a cylindrical shape such that the direction of the contact arrangement is parallel to the central axis. The heat pump according to claim 1 or 2, further comprising: an auxiliary tank for storing warmth; and a heat pump capable of supplying warmth stored in the auxiliary tank to the hot water supply pipe, and mixing hot water from the heat pump hot water supply circuit. Water heater. 3. The two refrigeration units according to claim 1 or 2, wherein the heat pump refrigerant circuit includes two compressors, a pressure reducing device, and two evaporators, and the refrigerant heat pipes of the water-refrigerant heat exchanger are connected to respective compressors. Cycle heat pump water heater. The heat pump water heater according to claim 1 or 2, wherein the heat pump refrigerant circuit is provided with a heat exchanger for further heating bath water separately from the water-refrigerant heat exchanger. A water-cooling heat exchanger, a pressure reducing device, an evaporator for heat-exchanging air and a refrigerant, and a heat pump refrigerant circuit connected in sequence through a refrigerant pipe; A water supply source and the water-refrigerant heat exchanger and a tapping terminal, a water supply pipe is connected to the water supply source and the water-refrigerant heat exchanger, and the water-refrigerant heat exchanger and a tapping terminal are provided with a heat pump hot water supply circuit connected to the hot water supply pipe. , The water-refrigerant heat exchanger is installed at a position where the refrigerant heat pipe through which the refrigerant from the heat pump refrigerant circuit flows and the water heat pipe through which the water from the heat pump hot water supply circuit flows; The water heat pipe is installed in plurality between the water supply pipe and the hot water supply pipe to increase the heat exchange efficiency in the water-refrigerant heat exchanger, The instantaneous hot water supply type heat pump water heater for heating the water supplied from the water supply source in the water-refrigerant heat exchanger to supply directly to the tapping terminal. A water-cooling heat exchanger, a pressure reducing device, an evaporator for heat-exchanging air and a refrigerant, and a heat pump refrigerant circuit connected in sequence through a refrigerant pipe; A heat pump hot water supply circuit connecting a water supply source and the water-refrigerant heat exchanger and a tapping terminal, wherein the water supply source and the water-refrigerant heat exchanger are connected to a water supply pipe, and the water-refrigerant heat exchanger and a tapping terminal are connected to a hot water supply pipe. With heat pump hot water circuit, An auxiliary tank for storing warmth supplied to the tapping terminal; A bypass circuit for bypassing the water-refrigerant heat exchanger and the auxiliary tank to supply water directly from the water supply source to the tapping terminal, When the water supplied from the water supply source is heated to the water-refrigerant heat exchanger and directly supplied to the tapping terminal by controlling the rotation speed of the compressor, adding warmth of the auxiliary tank as needed and tapping the tapping tap from the tapping terminal. In the instantaneous hot water type heat pump hot water supply machine, which adds water due to the water supply decrease through the bypass circuit to control the temperature of the hot water, The water-refrigerant heat exchanger is installed at a position where the refrigerant heat pipe through which the refrigerant from the heat pump refrigerant circuit flows and the water heat pipe through which the water from the heat pump hot water supply circuit flows; The water heat transfer pipe is a heat pump hot water heater of the instantaneous hot water supply system is installed a plurality between the water supply pipe and the hot water supply pipe to increase the heat exchange efficiency in the water-refrigerant heat exchanger.

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