JP3883184B2 - Heat pump water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat pump water heater that boils water in a hot water tank with heat collected by a heat pump type heat collector.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as described in, for example, Japanese Patent Application Laid-Open No. 5-71826, a heat pump water heater is known in which the water in a hot water tank is boiled by heat collected by a heat pump heat collector.
[0003]
This heat pump water heater is composed of a closed circuit in which a compressor, a refrigerant water heat exchanger (condenser), an expansion valve, an outdoor heat exchanger (evaporator), etc. are sequentially connected in series, and a heat pump type heat collector that circulates refrigerant. Heat exchange with the refrigerant water heat exchanger (condenser) of the heat pump type heat collector in the circulation pipe that circulates the water in the water tank and the hot water tank from the lower part to the upper part of the hot water tank by the circulation pump. The whole water was boiled from the upper part of the hot water tank by the lamination method.
[0004]
[Problems to be solved by the invention]
By the way, in recent years, the performance of the refrigerant used in the heat pump type heat collector of such a conventional heat pump water heater has been improved, and hot water with high output (about 90 ° C.) can be boiled. Thus, the hot water in the hot water tank boiled to a high temperature may naturally dissipate due to long-term non-use and the like, and the hot water temperature may decrease. In such a case, a hot water temperature sensor (not shown) is operated to operate the heat pump type heat collector to re-boiling hot water in the hot water storage tank. However, the operation of the heat pump type heat collector requires measures such as stopping the operation because the compressor is overloaded when the hot water temperature in the circulation pipe is about 60 ° C. or higher. Moreover, there is a problem that, if operated as it is, the coefficient of performance (COP) is lowered.
[0005]
The present invention has been made in view of the above points, and even when the hot water in the hot water tank is naturally radiated due to long-term non-use or the like and the hot water temperature is lowered, the coefficient of performance (COP) is not lowered so much. An object of the present invention is to provide a heat pump water heater that can reliably reheat by operating a heat pump type heat collector.
[0006]
[Means for Solving the Problems]
The heat pump water heater according to claim 1, wherein a compressor, a heat-pump heat collector in which the refrigerant is composed is circulated in the condenser and the evaporator, etc. are sequentially connected in series to a closed circuit, a hot water tank, the hot water tank Hot water is supplied from the lower part and hot water is supplied from the upper part, and the water in the lower part of the hot water tank circulated by a circulation pump is heated by heat exchange with the condenser, and the heated hot water is supplied from the upper part of the hot water tank. In a heat pump water heater having a circulation pipe for boiling water of the entire hot water tank by laminating hot water from the upper part of the hot water tank, an auxiliary evaporator connected to the circulation pipe and provided integrally with the evaporator , a bypass pipe provided parallel to the auxiliary evaporator, the hot water flow of the circulation pipe is provided on the input side of the auxiliary evaporator and the bypass pipe in the circulation pipe and an auxiliary evaporator side by A switching valve that switches to the piping side, a circulating hot water temperature sensor that is provided on the input side of the switching valve in the circulating piping and detects the temperature of hot water in the circulating piping, and the temperature of hot water detected by the circulating hot water sensor And a control device that switches the switching valve to the auxiliary evaporator side when the temperature is higher than a predetermined temperature, and switches the switching valve to the bypass piping side when the temperature is low .
[0007]
With this configuration, when the hot water in the hot water tank naturally radiates due to long-term non-use, etc. and the temperature drops, the switching valve is auxiliary evaporated if the temperature of the hot water detected by the circulating hot water temperature sensor is higher than the predetermined temperature. switched to vessel side, it is connected to the circulation pipe auxiliary evaporator is collected hot water heat in the circulation pipe to the evaporator, without significantly decreasing the coefficient of performance to reduce the hot water temperature (COP) in the circulation pipe, a heat pump The hot water collector in the hot water tank can be re-boiled by operating the heat collector normally. In addition, if the temperature of the hot water detected by the circulating hot water temperature sensor is lower than the predetermined temperature, the switching valve is switched to the bypass piping side, and hot water is passed through the bypass piping side of the circulating piping, so that the piping resistance is low and the water is heated efficiently. It can be carried out.
[0008]
The heat pump water heater according to claim 2 is the heat pump hot water supply apparatus according to claim 1, and a three-way valve which is provided to the input side of the switching valve and circulating hot water temperature sensor definitive in circulation piping, wherein the upper portion of the hot water storage tank three-way a heat exchange pipe connected between the valve is the ash is provided a floor heating system which is heated by heat exchange with the heat exchange pipe.
[0009]
By this arrangement, when cold was hot water re-boiling of the heat exchange in the pipe, which has been subjected as a floor heating system by the heat exchange of the heat exchange portion of the heat exchange pipe and heating pipe, a three-way valve If the temperature of the hot water detected by the circulating hot water temperature sensor is higher than the specified temperature, the switching valve is switched to the auxiliary evaporator side, and the auxiliary evaporator removes the heat of the hot water in the circulation pipe from the evaporator. it can be a sampled, performing hot water re-boiling hot water temperature and operating properly heat pump heat collector decreases the in which cold heat exchange in the pipe in the circulation pipe.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0011]
FIG. 1 shows a configuration diagram of a heat pump water heater. This heat pump water heater is composed of a compressor 1, a four-way valve 2, a condenser 3 as a heat exchanger, an expansion valve 4 for decompression, and a heat collecting accelerator. A heat-pump-type heat collector 8 in which the refrigerant circulates in a closed circuit that sequentially connects the blower fan 5 and an evaporator 7 having a drive motor 6 for the blower fan 5 in series.
[0012]
Further, the hot water tank 9 and the hot water tank 9 are provided with a hot water temperature detection sensor 9a at the lower portion of the wall surface, and have a circulation pump 10 for circulating the water in the hot water tank 9, and the circulation pump 10 A circulation pipe 11 is provided that circulates from the lower part of the hot water tank 9 to the upper part of the hot water tank 9 and heats the water in the hot water tank 9 by heat exchange with the condenser 3. Further, an auxiliary evaporator 12 provided integrally with the evaporator 7 is connected to the circulation pipe 11. Further, a bypass pipe 36 is connected in parallel to the auxiliary evaporator 12 via a switching valve 35 connected to the circulation pipe 11. Thereby, when boiling hot water at the initial stage of energization, it is possible to efficiently boil by reducing the pipe resistance by passing the circulating pipe through the bypass pipe 36 side. Further, the circulating pipe 11 is provided with a circulating hot water temperature sensor 37.
[0013]
Moreover, it has the water supply pipe | tube 14 which has the pressure-reduction valve 13 which introduces a tap water from the hot water storage tank 9 lower part, and the hot water supply pipe | tube 15 which supplies hot water in the hot water storage tank 9 to a kitchen or a bathtub. Each of the hot water supply pipes 15 branches, has a mixing valve 16A and a temperature sensor 16B, and has a hot water supply pipe 18 connected to a kitchen sink 17, and a hot water supply pipe 20 having a mixing valve 19A and a temperature sensor 19B. And connected to the bathtub 21. Reference numeral 23 denotes a water supply pipe. The water supply pipe 23 branches to the water supply pipe 14 and supplies tap water for mixing to the mixing valves 16A and 19A, respectively. Reference numeral 24 denotes a cold water pipe for supplying cold water to the kitchen sink 17.
[0014]
Furthermore, this heat pump water heater is provided with a floor heating device 25 for heating the indoor floor using the heat of the hot water in the hot water tank 9. That is, the floor heating device 25 includes a three-way valve 26 connected to the input side of the auxiliary evaporator 12 provided in the circulation pipe 11 and a heat exchange connected between the three-way valve 26 and the hot water tank 9. The heat exchanger includes a pipe 27 and a heat dissipating part 29 having a heat dissipating part 29 that is heat-exchanged by the heat exchanging part 28 of the heat exchanging pipe 27 and arranged in a meandering manner, and enclosing circulating water therein. The heat radiating pipe 30 is provided with a pump 31 and a hot water temperature sensor 32.
[0015]
Reference numeral 33 denotes a control device as operation control means. The control device 33 receives detection signals from the hot water temperature detection sensor 9a, the temperature sensor 16B, the temperature sensor 19B, the hot water temperature sensor 32, the circulating hot water temperature sensor 37, and the like. The The controller 33 controls the drive of the drive motor 6, the compressor 1 , the circulation pump 10, the mixing valve 16A, the mixing valve 19A, the three-way valve 26, the pump 31, the switching valve 35, and the like. Reference numeral 34 denotes an auxiliary heater. The auxiliary heater 34 is operated when the heat pump type heat collector 8 cannot sufficiently collect heat.
[0016]
Next, the operation of the present embodiment will be described.
[0017]
First, the operation of boiling water in the hot water tank 9 will be described with reference to FIG. Tap water is stored in the hot water tank 9 from the water supply pipe 14. Then, the compressor 1 is driven by the control device 33. Thereby, as shown by a two-dot chain arrow, the refrigerant flows in the order of the compressor 1, the four-way valve 2, the condenser 3, the expansion valve 4, and the evaporator 7. The refrigerant that collects and heats atmospheric heat in the evaporator 7 is sent to the compressor 1, and the high-temperature and high-pressure refrigerant gas that is compressed by the compressor 1 exchanges heat with the water in the circulation pipe 11 in the condenser 3. Is done.
[0018]
On the other hand, the circulation pump 10 of the circulation pipe 11 is driven, and the water in the lower part of the hot water tank 1 is moved from the three-way valve 26 of the circulation pipe 11 and the hot water temperature detection sensor 9a or the circulating hot water temperature sensor 37 as shown by a solid arrow. The temperature is detected, the switching valve 35 is switched to the bypass pipe 36 side by this signal, the water in the circulation pipe 11 is heat-exchanged by the condenser 3 through the bypass pipe 36 side, and hot water is stored as indicated by the dotted arrow. Entering the upper part of the tank 9 and repeating this, hot water of about 90 ° C. of the set temperature is sequentially laminated from the upper part of the hot water tank 9, and the water of the entire hot water tank 9 is boiled up.
[0019]
Next, the hot water supply operation of the hot water in the hot water storage tank 9 will be described with reference to FIG. The controller 33 adjusts the mixing valve 16A and the mixing valve 19A at the set temperature and opens a hot water supply solenoid valve (not shown) to mix hot water in the hot water supply pipe 15 and tap water in the water supply pipe 23 to the sink 17 and the bathtub 21 respectively. Hot water supply. Moreover, the temperature sensor 16B and the temperature sensor 19B monitor the drop in hot water temperature.
[0020]
On the other hand, as the hot water in the hot water tank 9 used by this hot water supply decreases, new water is supplied to the lower part of the hot water tank 9 from the water supply pipe 14. The newly supplied water is boiled by the operation of the heat pump type heat collector 8. That is, when the hot water temperature detection sensor 9a detects a decrease in the hot water temperature in the lower part of the hot water tank 9, this detection signal enters the control device 33 and opens the three-way valve 26, and the circulating hot water temperature sensor 37 reduces the hot water temperature to 35 ° C. or less, for example. If detected, the switching valve 35 is switched to the bypass pipe 36 side, hot water is passed through the bypass pipe 36 and heat is exchanged in the condenser 3 to boil.
[0021]
Next, the re-boiling action when the hot water in the hot water tank 9 is naturally radiated due to long-term non-use or the like and lowered to a temperature of, for example, about 60 ° C. will be described with reference to FIG. When the hot water temperature detection sensor 9a in the hot water tank 9 detects a cold hot water temperature of about 60 ° C. in the hot water tank 9, this detection signal enters the control device 33 and opens the three-way valve 26, and the circulating hot water temperature sensor 37 indicates the hot water temperature. For example, if 35 ° C. or more is detected, the switching valve 35 is switched to the auxiliary evaporator 12 side, and hot water is supplied to the auxiliary evaporator 12 side. The auxiliary evaporator 12 heats the hot water in the circulation pipe 11 to the evaporator 7 . Collect and re-boiling the hot water in the hot water tank by operating normally without lowering the hot water temperature in the circulation pipe and stopping the heat pump type collector.
[0022]
Next, an operation when the hot water in the heated hot water tank 9 is used for the floor heating device will be described with reference to FIG.
[0023]
The control device 33 switches the three-way valve 26 to the heat exchange pipe 27 side. At the same time, the pump 31 of the heat radiation pipe 30 of the floor heating device 25 is driven because the hot water temperature sensor 32 detects a low temperature. Thereby, the circulating water in the heat radiating pipe 30 circulates in the heat radiating pipe 30, exchanges heat with hot water in the heat exchanging portion 28 of the heat exchanging pipe 27, radiates heat from the heat radiating portion 29, and is used for indoor heating.
[0024]
On the other hand, the hot water that is heat-exchanged with the heat radiating pipe 30 in the heat exchange pipe 27 and cooled to about 50 ° C. is the same as the case where the hot water in the hot water tank 9 is naturally radiated and re-boiled due to long-term nonuse. The water is re-boiled by the action and returned to the hot water tank 9 so that the hot water temperature in the hot water tank 9 is always kept at about 90 ° C. That is, the hot water cooled to about 50 ° C. after passing through the heat exchange pipe 27 is sent to the circulation pipe 11 through the three-way valve 26, and the circulating hot water temperature sensor 37 detects the hot water temperature, for example, 35 ° C. or more. Then, the switching valve 35 is switched to the auxiliary evaporator 12 side, and hot water is flowed to the auxiliary evaporator 12 side. The auxiliary evaporator 12 collects the heat of the hot water in the circulation pipe 11 in the evaporator 7, and the hot water in the circulation pipe is collected. It operates normally without lowering the temperature and stopping the heat pump collector, and reboiling the hot water in the hot water tank.
[0025]
【The invention's effect】
According to the heat pump water heater of the first aspect, when the hot water in the hot water tank is naturally radiated due to long-term non-use or the like and the temperature is lowered, the temperature of the hot water detected by the circulating hot water temperature sensor should be higher than a predetermined temperature. if switching the switching valve to the auxiliary evaporator side, the circulation pipe connected to an auxiliary evaporator is collected hot water heat in the circulation pipe to the evaporator, the heat pump heat collector to lower the hot water temperature in the circulation pipe It can be operated normally to reboiler the hot water in the hot water tank. In addition, if the temperature of the hot water detected by the circulating hot water temperature sensor is lower than the predetermined temperature, the switching valve is switched to the bypass piping side, and hot water is passed through the bypass piping side of the circulating piping, so that the piping resistance is low and the water is heated efficiently. It can be carried out.
[0026]
According to the heat pump water heater according to claim 2, the heat exchange pipes and heating pipes and by the heat exchange of the heat exchange portion the floor heating device subjected to cold heat exchanger hot water re-boiling in the pipes after the At that time, hot water is supplied to the circulation pipe through the three-way valve, and if the temperature of the hot water detected by the circulating hot water temperature sensor is higher than a predetermined temperature, the switching valve is switched to the auxiliary evaporator side, and the auxiliary evaporator is installed in the circulation pipe. The heat of the hot water is collected in an evaporator, and the temperature of the hot water in the circulation pipe is lowered to normally operate the heat pump type heat collector to reboiler the cold hot water in the heat exchange pipe.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram for explaining a configuration of a heat pump water heater and a boiling state of water in a hot water tank showing an embodiment of the present invention.
FIG. 2 is an explanatory diagram for explaining a state where the heat pump water heater is used for hot water supply.
FIG. 3 is an explanatory diagram for explaining a state in which the heat pump water heater is used as a floor heating device.
[Explanation of symbols]
1 compressor 3 condenser 7 evaporator 8 heat pump heat collector 9 hot-water tank 10 circulation pump 11 circulation pipe 12 auxiliary evaporator 15 the hot water supply pipe 25 Floor Heating 26 three-way valve 27 heat exchanger piping 33 controlled as a heat exchanger Device 35 selector valve
36 Bypass piping 37 Circulating hot water temperature sensor

Claims (2)

A heat pump type heat collector in which a refrigerant is circulated configured by a closed circuit in which a compressor, a condenser, an evaporator, and the like are sequentially connected in series;
A hot water tank,
A hot water supply pipe that supplies water from the lower part of the hot water tank and supplies hot water from the upper part,
The water in the lower part of the hot water tank circulated by the circulation pump is warmed by heat exchange with the condenser, and the heated hot water is supplied from the upper part of the hot water tank, and stacked hot water is stored from the upper part of the hot water tank. in heat pump feeding water machine and a circulation pipe to raise boiling water,
An auxiliary evaporator connected to the circulation pipe and provided integrally with the evaporator;
A bypass pipe provided parallel to the auxiliary evaporator,
A switching valve that is provided on the input side of the auxiliary evaporator and bypass pipe in the circulation pipe and switches the flow of hot water in the circulation pipe between the auxiliary evaporator side and the bypass pipe side;
A circulating hot water temperature sensor which is provided on the input side of the switching valve in the circulation pipe and detects the temperature of the hot water in the circulation pipe;
And a control device for switching the switching valve to the auxiliary evaporator side if the temperature of the hot water detected by the circulating hot water temperature sensor is higher than a predetermined temperature, and switching the switching valve to the bypass piping side if the temperature is low. Heat pump water heater. A three-way valve which is provided to the input side of the switching valve and circulating hot water temperature sensor definitive in circulation piping,
A heat exchange pipe connected between the upper part of the hot water tank and the three-way valve;
The heat pump water heater according to claim 1, characterized by providing a floor heating system which is heated by heat exchange with the heat exchange pipe.

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