JPS62252864A - Heat pump type heating hot-water supply machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a heat pump type heating and water heater.

(Prior Art) As a conventional example of a heat pump type heating water heater, for example, Japanese Patent Application Laid-Open No. 60-86357 can be mentioned.
This device returns the refrigerant discharged from the compressor to the compressor through an indoor heat exchanger, an expansion valve, and an outdoor heat exchanger in sequence, and also exchanges heat in a bathtub in parallel with the indoor heat exchanger. It has a structure in which a water tank and a hot water storage tank heat exchanger are connected.

In this device, the high pressure gas refrigerant from the compressor is condensed in an indoor heat exchanger and a bathtub heat exchanger.
The water in the hot water tank is heated by condensing the high pressure gas refrigerant from the compressor in the hot water tank heat exchanger.

In the above device, when performing a defrost operation to remove frost on the outdoor heat exchanger, one of the indoor heat exchanger, bathtub heat exchanger, or hot water tank heat exchanger is used as an evaporator. It has become. That is,
As a heat source for defrost operation, either indoor heat, bathtub exhaust heat, or hot water tank water heat is used.

(Problems to be Solved by the Invention) However, in the conventional heat pump type heating water heater described above, it is unclear which of the indoor heat, bathtub exhaust heat, or hot water storage tank water heat is used as a heat source during defrosting operation. Since no priority is set, for example, there may be cases where indoor heat is used to perform defrost operation when waste heat from a bathtub is available; in such cases, thermal energy can be used effectively. If this is not done, the indoor temperature will drop and the user will feel uncomfortable.

This invention was made to solve the above-mentioned conventional drawbacks, and its purpose is to make it possible to effectively utilize heat sources such as exhaust heat during defrost operation, and to prevent a drop in indoor temperature as much as possible. To provide a heat pump type heating and water heater that can alleviate user's discomfort.

(Means for solving the problem) Therefore, in the heat pump type heating hot water supply of this invention,
The refrigerant discharged from the compressor 1 is returned to the compressor 1 via the indoor heat exchanger 19, the expansion mechanism 15, and the outdoor heat exchanger 10 in order, and the indoor heat exchanger 19 is connected to a bathtub in parallel with each other. In a heat pump type heating water heater configured by connecting a heat exchanger 21 and a hot water storage tank heat exchanger 23, the first
As shown in the figure, a first output means 35 outputs a bathtub exhaust heat availability signal when the bathtub is not heated or kept warm.
and a second output means 3 for outputting a hot water storage tank hot water availability signal.
7, and when a signal is input from the first output means 35, the defrost operation is performed using the bathtub exhaust heat, and when no signal is input from the first output means 35, the second output means 37 When a signal is input, a defrost operation using hot water from the hot water storage tank is performed, and when no signal is input from either the first output means 35 or the second output means 37, a defrost operation is performed using indoor heat. This configuration includes an operation control means 38 for controlling the valve switching means 33.

(Function) In the heat pump type heating water heater described above, the exhaust heat from the bathtub 28 is first used preferentially as a heat source during defrost operation, and when the exhaust heat from the bathtub 28 cannot be used, the hot water heat from the hot water storage tank 29 is used. In addition, only when exhaust heat from the bathtub 28 and hot water from the hot water storage tank 29 cannot be used together, the defrost operation is performed using indoor heat. As a result, it becomes possible to effectively use the exhaust heat from the bathtub during defrost operation, and the indoor heat exchanger is only used as a heat source during defrost operation when no other heat source can be used. Therefore, it is possible to prevent the indoor temperature from decreasing as much as possible, and thereby the user's discomfort due to the decrease in the indoor temperature can be alleviated.

(Embodiments) Next, specific embodiments of the heat pump type heating and water heater of the present invention will be described in detail with reference to the drawings.

First, Fig. 2 shows a refrigerant circuit diagram, and as shown in the figure, this air conditioner consists of an outdoor unit X and three indoor units A.
-C, a bathtub unit Y, and a hot water tank unit 2. The outdoor unit x has a compressor 1, and a discharge pipe 2 and a suction pipe 3 of the compressor 1 are each connected to a four-way switching valve 4. Note that the compressor 1 is
It has an inverter 5 for controlling its rotational speed, that is, its compression capacity, and the discharge pipe 2 is equipped with a first
A solenoid valve 6 and an accumulator 7 are interposed in the suction pipe 3, respectively. A first gas pipe 8 and a second gas pipe 9 are connected to the four-way switching valve 4, and the first gas pipe 8 is connected to an outdoor heat exchanger 10, and the second gas pipe 9 is also connected to an outdoor heat exchanger 10. is connected to the header 11. Further, a first liquid pipe 13 is connected to the outdoor heat exchanger 10, and this first liquid pipe 13 is connected to a liquid receiver 14, and a first expansion valve 15 is interposed in the middle thereof. has been done.

One end of a second liquid pipe 16 is connected to the liquid receiver 14, but a plurality of (in the case of the figure) branch refrigerant piping 1
8a...18d are connected in parallel to each other, and one of the branch refrigerant pipes 18d is connected to the bathtub heat exchanger 2.
1 and a second expansion valve 20d, and each of the remaining branch refrigerant pipes 18a, 18b, 18c has an indoor heat exchanger 19...19 (only one is shown) and a second expansion valve 20a, 20b. , 20c are interposed. Although only one indoor unit A is illustrated, each of the indoor units A to C is composed of the indoor heat exchangers 19...19 and the indoor fans 30...30. The bathtub unit Y also includes the bathtub heat exchanger 21, the bathtub 28,
It is constituted by a circulation pump 28a.

On the other hand, a third gas pipe 22 is further connected to the discharge pipe 2 of the compressor 1, and a hot water tank heat exchanger 23 is connected to the third gas pipe 22.
is further connected to the liquid receiver 14 through a third liquid pipe 24 . A second electromagnetic valve 25 is connected to the third gas pipe 22, and a capillary tube 25 is connected to the third liquid pipe 24.
A bypass pipe 40 is further connected to the third liquid pipe 24 to bypass the check valve 27, and this bypass pipe 4
A third electromagnetic valve 41 and a capillary tube 42 are interposed at 0. Further, the intermediate portion of the third gas pipe 22 and the intermediate portion of the suction pipe 3 are connected by a connecting gas pipe 43, and a first electromagnetic valve 44 is interposed in the connecting gas pipe 43.

Note that 29 is a hot water storage tank.

During the heating operation of the heating water heater and bathtub heating operation, the first solenoid valve 6 is opened, the second solenoid valve 25 is closed, and the compressor 1 is operated (the third and fourth solenoid valves 41 and 44 are both closed). .

Then, the refrigerant passes through the four-way switching valve 4, the second gas pipe 9, and the indoor heat exchangers 19...19 and the bathtub heat exchanger 2.
1, then evaporated in the outdoor heat exchanger 10 via the second liquid pipe 16 and the first liquid pipe 13, and then passed through the first gas pipe 8 and the four-way switching valve 4 to the compressor. The flow is returned to 1.

Also, during hot water supply operation, the first solenoid valve 6 is closed and the second solenoid valve 2 is closed.
5 and operate the compressor 1 (3rd, 4th,
Solenoid valves 41 and 44 are both closed). Then, the refrigerant
It condenses in the hot water tank heat exchanger 23 via the gas pipe 22, and then evaporates in the outdoor heat exchanger 10 via the third liquid pipe 24, the liquid receiver 14, and the first liquid pipe 13. Thereafter, the flow returns to the compressor 1 via the first gas pipe 8 and the four-way switching valve 4 in the same manner as described above.

When performing heating or bathtub heating and hot water supply simultaneously, both the first solenoid valve 6 and the second solenoid valve 25 are opened, and the refrigerant discharged from the compressor l is transferred to the indoor heat exchanger 1.
9 or the bathtub heat exchanger 21 and the hot water tank heat exchanger 23, respectively, in parallel.

In addition, in the cooling/bathtub cooling operation in the above device, the four-way switching valve 4 is switched, and the indoor heat exchanger 1 is switched from the outdoor heat exchanger IO side to the indoor heat exchanger 1 side.
The cooling, bathtub cooling, and hot water supply operations are performed by circulating the refrigerant to the hot water storage tank heat exchanger 21 side through the third gas pipe 22. It is condensed in the exchanger 23, and then the third liquid pipe 2
4. Evaporate in each indoor heat exchanger 19...19 and bathtub heat exchanger 21 via liquid receiver 14 and second liquid pipe 16, and then open second gas pipe 9 and four-way switching valve 4. This is done by circulating the water through a circuit that then returns to the compressor 1.

Next, the defrost operation control system of the heating water heater will be explained based on FIG. 3. First, outdoor unit X is
It has an outdoor control device 31, an inverter control device 32, and a valve switching means 33, and the inverter control device 32 is for controlling the frequency in the inverter 5, that is, the rotation speed of the compressor 1. It is. Also, the valve switching means 3
3, the first solenoid valve 6, the second solenoid valve 25, and the third solenoid valve 4 are operated in response to a command from the operation control means of the outdoor control device 31.
It is for controlling the operations of the first and fourth solenoid valves 44, the four-way switching valve 4, etc., and controlling the flow of refrigerant during heating operation, bathtub heating operation, defrosting operation, etc.

Further, a signal is inputted to the outdoor control device 31 from the bathtub unit Y, and this signal is a bathtub waste heat utilization availability signal indicating that the bathtub 28 is not in heating or warming operation. be. That is, a remote control box 34 connected to the bathtub unit Y is arranged in a room such as a kitchen, and a bathtub exhaust heat utilization switch 35 is provided on this remote control box 34. On the premise that the is turned ON, the above signal is sent to the bath control device 28.
It is output to the outdoor control device 31 via b.

On the other hand, a hot water temperature thermometer 36 as a hot water temperature detection means is disposed in the hot water storage tank 29, and this hot water temperature thermometer 36 is connected to a comparator 37 of the outdoor control device 31. In other words, the hot water temperature in the hot water storage tank 21 detected by the hot water temperature thermometer 36 is compared with a reference value (for example, 12°C) by this comparator 37, and if the hot water temperature is higher than the reference value, this comparator 37, a hot water storage tank hot water availability signal is input to the operation control means.

Next, a method for controlling the defrost operation of the heat pump heating and water heater will be explained based on FIGS. 1 and 2. First, when a bathtub exhaust heat utilization enable signal is input from the first output means, that is, the bathtub exhaust heat utilization switch 35 of the remote control box 34 to the operation control means 38 of the outdoor control device 31, the operation control means utilizes the bathtub exhaust heat. The valve switching means 33 is controlled to perform the defrost operation. That is, the first solenoid valve 6 is opened, the second solenoid valve 25 is closed, and the third solenoid valve is closed.
The solenoid valve 41 and the fourth solenoid valve 44 are closed), and the second expansion valve 20d corresponding to the bathtub heat exchanger 21 is controlled to open.
(Other second expansion valves 20a120b, 20c
(closed). Then, the outdoor heat exchanger 10 is defrosted by the refrigerant (hot gas) from the compressor 1, and the condensed refrigerant is transferred to the first liquid pipe 13, the liquid receiver 14, and the second liquid receiver 14.
Evaporation (endotherm) in the bathtub heat exchanger 21 via the liquid pipe 16
I will do it. Then, the evaporated refrigerant is transferred to the second gas pipe 9,
It is returned to the compressor 1 via the four-way switching valve 4.

Further, if a signal is not inputted from the first output means 34 to the operation control means 38 and a hot water storage tank hot water availability signal is inputted from the second output means, that is, the comparator 37 to the operation control means 38, the operation control means Reference numeral 38 controls the valve switching means 33 to perform a defrost operation using hot water from the hot water storage tank. That is,
Open the first solenoid valve 6, close the second solenoid valve 25, and close the third solenoid valve 4.
Open the first and fourth solenoid valves 44 and open the second expansion valves 20a to 20d.
Operate compressor 1 with all closed. Then, the refrigerant from the compressor 1 is condensed in the outdoor heat exchanger 10, and the condensed refrigerant flows through the first liquid pipe 13, liquid receiver 14, third liquid pipe 24, and bypass pipe 40 to the third liquid pipe 24 again. The hot water is then evaporated (heat absorbed) in the hot water storage tank heat exchanger 23. The evaporated refrigerant then flows back to the compressor 1 via the third gas pipe 22, the connecting gas pipe 44, and the suction pipe 3.

When no signal is input to the operation control means from either the first output means 34 or the second output means 37, the operation control means 3B controls the valve switching means 33 to perform a defrost operation using indoor heat. That is, the first solenoid valve 6 is opened, the second solenoid valve 25 is closed, and the third and fourth solenoid valves 41 and 44 are both closed), and the indoor heat exchanger 19 to be used is
The second expansion valves 20a to 20c corresponding to the second expansion valves 20a to 20c are controlled to open to operate the compression fil (the second expansion valve 20d for the bathtub is closed). Then, the refrigerant from the compressor 1 is condensed in the outdoor heat exchanger 10, and the condensed refrigerant is transferred to the first liquid pipe 13, the liquid receiver 14, and the second liquid receiver 14.
Evaporation (endotherm) in outdoor heat exchanger 19 via liquid pipe 16
I will do it. Then, the evaporated refrigerant is transferred to the second gas pipe 9,
It is returned to the compressor l via the four-way switching valve 4. In other words, as shown in Table 1, the above control method uses the bathtub waste heat preferentially when it is available, and when it cannot be used, the hot water in the hot water storage tank is used next, and the bathtub waste heat is used as a priority. If neither the heat nor the hot water from the hot water storage tank can be used, the defrost operation is performed according to a certain order of priority, ultimately using indoor heat.

In the above example, the bathtub waste heat utilization switch 35 is used as the first output means. However, by detecting the temperature of the bathtub water and detecting that this temperature is within a predetermined range, the bathtub exhaust heat utilization switch 35 is used. The first output means may be configured to detect the state of use and output a signal based on the detected state of use. In addition to using the hot water temperature thermometer 36 and the comparator 37 as described above, the second output means also detects the outside air temperature (tap water temperature) and outputs a signal when the detected temperature is higher than the reference value. An output method or a manual switch may be used.

Table 1 (Effects of the Invention) In the pump type water heater of this invention, the exhaust heat of the bathtub is first used preferentially as a heat source during defrost operation, and when the exhaust heat of the bathtub cannot be used, hot water is stored. The defrost operation uses the hot water in the tank, and when the hot water in the bathtub and the hot water storage tank are both unavailable, indoor heat is used to perform the defrost operation, so the exhaust heat from the bathtub is effectively used during the defrost operation. At the same time, it is possible to prevent the indoor temperature from decreasing as much as possible, thereby alleviating the user's discomfort caused by the decrease in the indoor temperature.

[Brief explanation of drawings]

The figures show an embodiment of the heat pump type heating and water heater of the present invention, in which Fig. 1 is a functional system diagram, Fig. 2 is a refrigerant circuit diagram,
FIG. 3 is a block diagram of the operation control system. . 1...Compressor, 10...Outdoor heat exchanger, 15...
First expansion valve (expansion mechanism), 19... indoor heat exchanger, 2
1... Bathtub heat exchanger, 23... Hot water tank heat exchanger, 2
9... Hot water storage tank, 33... Valve switching means, 35... Bathtub exhaust heat utilization switch (first output means), 36... Hot water temperature thermometer, 37... Comparator (second output means) ), 38...
・Operation control means. Patent applicant: Daikin Industries, Ltd. Figure 1

Claims (1)

[Claims] 1. The refrigerant discharged from the compressor (1) is transferred to the indoor heat exchanger (
19), the expansion mechanism (15), and the outdoor heat exchanger (10) in order to return to the compressor (1), and a bathtub heat exchanger ( 21)
and a hot water storage tank heat exchanger (23), the first output means (35) outputs a bathtub exhaust heat utilization availability signal when the bathtub is not being heated or kept warm. , a second output means (37) for outputting a hot water storage tank hot water availability signal;
When a signal is input from the output means (35), the defrost operation using the exhaust heat of the bathtub is started, and the first output means (35)
), but when a signal is input from the second output means (37), the defrost operation using hot water from the hot water storage tank is performed, and the first output means (35) and the second output means (37) A heat pump type heating water heater characterized by having an operation control means (38) that controls a valve switching means (33) to perform a defrost operation using indoor heat when no signal is input from any of the above.