JP2001255008A - Hot water storage type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve an operating efficiency by continuously conducting a solar heat collecting operation without switching to a heat pump heat collecting operation by a heat stored in a thermal storage unit of a solar heat collector, when there is a solar light of clear skies like in case of frequently becoming a temporary cloud in an interval of the clear skies. SOLUTION: The heat pump heat collecting operation and the solar heat collecting operation are switched, and a hot water of a hot water storage tank is heated. In the case of the clear skies, a heat is stored in the thermal storage unit while conducting the solar heat collecting operation. If a temporary cloud is brought about after a predetermined heat amount is stored, a solar heat collecting temperature sensing means does not operate by a heat stored in the unit but continues the solar heat collecting operation without switching to the heat pump heat collecting operation and efficiently heats the hot water in the tank.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water storage type hot water supply device for selectively switching between a heat pump heat collection operation and a solar heat collection operation to efficiently boil water in a hot water storage tank. <BR>

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Publication No. 19458/1992, there is known a hot water storage type hot water supply apparatus in which hot water in a hot water storage tank is heated using a solar heat collector. ing. In this hot-water storage type hot water supply device, the solar heat collector has the advantage of being an energy-saving device using solar energy, but is susceptible to the weather, and has the inconvenience of not being able to collect and boil heat when necessary. In addition, a method is used in which a heat pump collector capable of constantly collecting heat even from atmospheric heat is used in combination to compensate for unstable elements of solar heat collection.

[0003] In this hot water storage type hot water supply apparatus, when solar heat collecting conditions are satisfied, such as when the amount of sunshine exceeds a predetermined value on a sunny day, solar heat collecting operation is performed to utilize solar energy. When the running water of the hot water tank is boiled at low running cost, and when the amount of solar heat collection is not satisfied, such as when the amount of sunlight falls below a predetermined value on a cloudy or rainy day,
A heat pump heat collection operation is performed to boil the hot water in the hot water storage tank using atmospheric heat.

[0004]

By the way, in such a hot-water storage type hot water supply device, when a temporary solar fogging operation is frequently performed during a sunny solar heat collecting operation,
There is a drawback that the operation of the solar heat collecting operation is frequently stopped and the operation efficiency is reduced. Further, when the atmospheric temperature decreases in the evening or the like, there is a disadvantage that the operation efficiency of the heat pump heat collecting operation decreases.

[0005] In view of the above, the present invention stores heat in a heat storage body in a box of a solar heat collector when there is clear sunlight, and the heat of the heat storage medium causes temporary clouding or the like. A continuous solar heat collecting operation is performed without stopping the heat collecting operation to improve the operation efficiency. In addition, as an effective method of utilizing solar heat, a heat pump heat collecting operation is performed when the ambient temperature is high, and at the same time, solar heat is stored in a heat storage unit of a solar heat collector. Then, when the operating temperature of the heat pump heat collection operation is reduced due to a decrease in the ambient temperature such as in the evening, the operation is switched to the solar heat collection operation, and the hot water in the hot water storage tank is heated with the heat stored in the heat storage body. To

[0006]

According to a first aspect of the present invention, there is provided a hot water supply type hot water supply apparatus, comprising: a heat pump collector having a closed circuit having a compressor, a condenser, and an evaporator; A solar heat collector connected in parallel, and selectively switching and connecting one of an evaporator and a solar heat collector to the compressor and the condenser, wherein a heat pump heat collecting operation and a solar heat collecting In a hot-water storage type hot water supply device that heats water in a hot water storage tank via a condenser by one of a heat collecting operation of the operation, the solar heat collector includes a box, and a heat collecting pipe piped in the box. And a heat storage element enclosed in the box, and a solar heat collecting temperature detecting means for detecting the temperature of the solar heat collector and switching the switching means.

With this configuration, when the weather is fine, heat is stored in the heat storage body while performing the solar heat collection operation. After a certain amount of heat is stored, even if the cloudiness temporarily comes, the solar heat collecting detection means does not operate due to the heat stored in the heat storage body, and the solar heat collecting operation does not switch to the heat pump heat collecting operation. It continues to boil the hot water in the hot water tank efficiently.

According to a second aspect of the present invention, there is provided a hot water storage type hot water supply apparatus comprising: a heat pump collector formed of a closed circuit having a compressor, a condenser, and an evaporator; and a solar connected in parallel to the evaporator. A heat collector, switching means for selectively switching one of an evaporator and a solar heat collector to the compressor and the condenser, and the solar heat collector comprises a box, A heat collecting pipe, and a heat storage element sealed in the box body, and a heat collecting operation in one of a heat pump heat collecting operation and a solar heat collecting operation in the hot water storage layer through the condenser. In a hot-water storage type water heater for boiling hot water, a heat pump heat collecting operation is performed when the ambient temperature is high, heat is stored in a heat storage body of a solar heat collector by solar heat, and the switching means is switched by switching the switching means when the ambient temperature decreases. Performs heat collection operation and turns into heat storage Raise boiling hot water in the hot water tank in the example was heat.

With this configuration, if the operating temperature of the heat pump heat collecting operation is reduced due to a decrease in the high temperature such as in the evening, the operation is switched to a closed circuit of the solar heat collecting operation to store the heat in the heat storage body when the high temperature is high. The hot water in the hot water tank is heated by the solar heat.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the hot water supply type hot water supply apparatus of the present invention will be described below with reference to the drawings.

[0011]

FIG. 1 is a block diagram of a hot water supply type hot water supply apparatus.
Is a hot water storage tank, which adopts a hot water supply method with a first stop push-up type.
A water supply pipe 2 connected to a water supply pipe is connected to a lower part of the hot water storage tank 1, and a water supply pipe 3 connected to a water supply pipe is connected to an upper part. The hot water supply pipe is connected to a hot water tap and the like installed in a bathroom, a kitchen, a washroom, and the like, for example.

A drain pipe 5 having a drain valve 4 is connected to a lower portion of the hot water storage tank 1, and a pressure relief valve 6 for releasing the expansion of water when boiling is connected to the hot water supply pipe 3.

A heat exchange passage 7 is connected to the exterior near the lower portion of the hot water storage tank 1, and heat exchanged with the heat exchange passage 7 through the lower and upper communication ports 8 and 9 into the hot water storage tank 1. An exchange passage 10 is formed. A circulation pipe 11 is connected between a lower part of the hot water storage tank 1 and a lower part of the heat exchange passage 10. The hot and cold water in the lower part of the hot water storage tank 1 is supplied to the heat exchange passage 1 through the circulation pipe 11.
A circulation pump 12 for forcibly circulating the water is provided.

On the outer wall of the body of the hot water storage tank 1, a remaining hot water level detection sensor 13 as a hot water level detecting means for detecting the remaining hot water level in the hot water storage tank 1, and a boiling detection for detecting boiling of hot water in the hot water storage tank 1. A water supply temperature detection sensor 15 as a water supply temperature detection means for detecting a water supply temperature guided into the hot water storage tank 1 is provided.

Reference numeral 16 denotes a heat pump collector, which is constituted by a closed circuit in which a compressor 17, a condenser 18, an expansion valve 19, and an evaporator 20 are connected in series by pipes 21, 22, and 23 in sequence. Is filled with a refrigerant. The compressor 17, the expansion valve 19, and the evaporator 20 are housed in a casing (not shown) to form a heat pump collector main body 24. The evaporator 20 has a fan 29 for sending outside air. The evaporator 20 is mounted outside the heat exchange passage body 7, and the heat exchange passage 10 and the condenser 18 constitute a heat exchanger 25.

Reference numeral 26 denotes a solar collector,
It is connected to the condenser 18 via pipes 27 and 28 respectively connected to the condenser 22. The solar heat collector 26 is installed in a place with good sunshine conditions, for example, on a roof, and has a box 31 and both ends of pipes 27 and 2 in the box 31.
The heat collecting pipes 32 connected to the respective pipes 8 are arranged in a meandering manner on a steel plate, and a light transmitting material 34 serving as a light receiving surface is provided on the upper surface as shown in FIG. Further, a heat storage body 35 made of, for example, magnesia is sealed in the box 31. At the connection position between the pipe 22 and the pipe 27,
An electric three-way valve 36 as switching means for switching and connecting one of the evaporator 20 and the solar collector 26 to the compressor 17 and the condenser 18 is provided.

The solar collector 26 includes a solar collector 26
A solar heat collecting temperature sensor 37 is provided as a solar heat collecting detecting means for detecting the temperature of the fuel cell. The three-way valve 36 is switched by the temperature signal of the temperature sensor 37 to switch between the heat pump heat collecting operation and the solar heat collecting operation. It has become.

Next, the solar heat collecting operation in fine weather will be described.

A three-way valve 36 connects the condenser 18 to the evaporator 2
The refrigerant is switched between the solar collector 26 and the condenser 18 by driving the compressor 17 as shown by a solid arrow in FIG. Flows. The refrigerant vaporized by the solar heat in the solar collector 26 is sent to the condenser 18 to be liquefied, and the heat of the refrigerant is given from the condenser 18 to the hot and cold water in the heat exchange passage 10 to exchange heat. At this time, the circulation pump 12 is driven,
Hot water (water) on the lower side of the hot water storage tank 1 is forcibly circulated through the heat exchange passage 10 so as to return to the hot water storage tank 1 again.
The whole amount of hot and cold water can be boiled up. On the other hand, heat by sunlight is stored in the heat storage body 35 of the solar collector 26.

Since the compressor 17 has a low load only by transporting the refrigerant, the number of revolutions is reduced as compared with the heat pump heat collecting operation, and power consumption is suppressed.

Next, a heat pump heat collecting operation for weather fogging will be described.

The three-way valve 36 connects the condenser 18 to the evaporator 2
The compressor 17 and the fan 29 are driven so that the compressor 17 and the fan 29 are driven so as to open the zero side and close the solar heat collector 26 side. When the compressor 17 is driven, the refrigerant flows in the order of the compressor 17, the condenser 18, the expansion valve 19, and the evaporator 20 of the heat pump collector 16, as shown by the dashed arrow in FIG.

The refrigerant that has been heat-exchanged with the outside air by the evaporator 20 and vaporized is compressed by the compressor 17 and
And the heat of the refrigerant is transferred from the condenser 18 to the heat exchange passage 10.
It is given to hot water and heat exchanged.

At this time, the circulation pump 12 is driven, and the hot water (water) on the lower side of the hot water tank 1 is forcibly circulated through the heat exchange passage 10 so as to return to the hot water tank 1 again. The whole amount can be boiled.

By the way, the weather in one day is rarely sunny throughout the day, and temporary cloudiness frequently occurs during the day. As described above, in the case where temporary cloudiness frequently occurs between fine days, the heat stored in the heat storage body 35 in the box 31 of the solar heat collector 26 when there is sunny sunlight temporarily causes temporary cloudiness. The operation efficiency can be improved by performing the solar heat collecting operation continuously without switching to the heat pump heat collecting operation due to cloudiness or the like. As an effective method of utilizing solar heat, a heat pump heat collecting operation is performed when the ambient temperature is high, and at the same time, solar heat is stored in the heat storage body 31 of the solar heat collector. Then, when the operating temperature of the heat pump heat collecting operation is reduced due to a decrease in the ambient temperature such as in the evening, the operation is switched to the solar heat collecting operation, and the hot water in the hot water storage tank 1 is heated by the heat stored in the heat storage body 31. To do.

[0026]

According to the hot water storage type hot water supply device of the present invention, when temporary clouding frequently occurs between fine days, heat is stored in the solar heat collector box when there is sunny sunlight. Due to the heat stored in the body, the solar heat collecting operation can be continuously performed without switching to the heat pump heat collecting operation due to temporary clouding or the like, and the operation efficiency can be improved.

According to the hot water storage type hot water supply device of the second aspect,
In the case where the operating temperature of the heat pump heat collecting operation is reduced due to a decrease in the ambient temperature such as in the evening, the heat is switched to the solar heat collecting operation circuit and the hot water stored in the heat storage body can be heated.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a hot water supply type hot water supply apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view of the solar collector.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 16 Heat pump heat collector 17 Compressor 18 Condenser 20 Evaporator 26 Solar heat collector 32 Heat collecting pipe 35 Heat storage body 36 Electric three-way valve as switching means 37 Solar heat collecting temperature sensor as solar heat collecting detecting means

Claims (2)

[Claims] 1. A heat pump collector comprising a closed circuit having a compressor, a condenser, and an evaporator, a solar collector connected in parallel to the evaporator, Switching means for selectively switching any one of the evaporator and the solar collector to the condenser, wherein the condenser is operated by one of the heat pump collecting operation and the solar collecting operation. In the hot water storage type hot water supply device for boiling hot water in a hot water storage tank through the solar heat collector, a box, a heat collecting pipe piped in the box, and a heat storage element sealed in the box And a solar heat collecting temperature detecting means for detecting the temperature of the solar heat collector and switching the switching means. 2. A heat pump collector formed of a closed circuit having a compressor, a condenser and an evaporator, a solar collector connected in parallel to the evaporator, Switching means for selectively switching and connecting one of the evaporator and the solar collector to the condenser; the solar collector includes a box, and a heat collection pipe provided in the box; And a heat storage unit enclosed in the box body, wherein a hot water storage type hot water supply device for boiling water in a hot water storage tank via a condenser by one of a heat pump heat collection operation and a solar heat collection operation. When the ambient temperature is high, the heat pump heat collecting operation is performed, and the heat is stored in the heat accumulator of the solar heat collector by solar heat, and when the atmospheric temperature decreases, the switching means is switched to perform the solar heat collecting operation and the heat is stored in the heat accumulator. Boiling water in the hot water tank A hot-water storage type hot-water supply device characterized by being heated.