JP2001336822A - Hot water storing type hot water feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain a hot water feeding state showing no-lukewarm feeling even if a shower or the like is used on the way where hot water feeding is performed for a bath and a toilet room or the like. SOLUTION: There is provided a heat pump type thermal collector constituted by a closed circuit having a compressor 22, a condenser 23 and an evaporator 20. There is provided a solar thermal collector 26 connected in parallel with the evaporator 20. Hot water within a tank is boiled up through the condenser 23 under a thermal collecting action of either one of a heat pump thermal collecting operation or a solar collecting operation or under both thermal collecting operations. When temperature sensors 12, 13 and 14 detect a substantial equal value during a boiling-up operation when hot water is left in a main tank 1, a main valve 11 in the main tank 1 is closed and a sub-valve 29 of a sub-tank 15 is opened and at the same time a branch valve 8 is changed over to connect it to a hot water feeding operation from the main tank 1 to the sub-tank 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply type hot water supply system for efficiently boiling hot water in an tank by a heat pump heat collecting operation or a solar heat collecting operation.

[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 tank is boiled at a low running cost, and when the solar heat collection conditions are not satisfied, such as when the amount of sunlight falls below a predetermined level on a cloudy or rainy day,
The heat pump heat collecting operation is performed, and the hot water in the tank is boiled using the atmospheric heat.

[0004]

A so-called push-up type hot water supply system in which hot water is supplied from the upper portion of the tank and water is supplied from the lower portion of the tank is provided when hot water is used in a bath, a lavatory, or the like. As the amount of remaining hot water decreases, water is supplied from the bottom of the tank,
A hot-water mixture layer and a layer with water are sequentially formed. On the other hand, the temperature of the hot water boiled by the solar heat collecting operation or the heat pump heat collecting operation is heated to a relatively low temperature as compared with a hot water storage type hot water supply system in which a heater is provided in a tank and heated. When hot water is supplied to baths, washrooms, etc. under such conditions, water is supplied to the lower part of the tank,
A solar heat collecting operation or a heat pump heat collecting operation is performed on the water in the lower portion of the tank, and the boiling operation is performed. When the hot / cold water layer is broken at the hot water / water mixing layer break point shown in FIG. 2 during the additional heating operation, the hot water in the upper portion of the tank and the hot water in the lower portion are mixed, and the temperature of the hot water in the tank is temporarily reduced. Will go down. As described above, when a shower or the like is used at the time of destruction of the hot water mixture layer, there is a disadvantage that the user feels slim.

The present invention has been made in view of the above points, and hot water is supplied to a bath, a lavatory, and the like, and when the remaining hot water due to partial use is supplied, the water in the lower portion of the tank is heated to a higher temperature. It is an object of the present invention to provide a hot water supply apparatus which does not have a lull feeling even when a shower or the like is used at the time of destruction of a hot water mixture layer generated during an additional boiling operation.

[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 collector connected in parallel, and switching means for selectively switching one of an evaporator and a solar collector to the compressor and the condenser or for selecting both of them. In a hot-water storage type hot water supply device provided with a heat pump and a solar heat collecting operation for boiling water in a tank via a condenser and a heat exchanger by a heat collecting operation of one or both of a heat collecting operation and a solar collecting operation, the tank is a main valve. A main tank having a sub-valve provided in parallel with the main tank, and switching means for switching hot water supply between the main tank and the sub-tank. , In which so as to switch connection to the hot water from the main tank to the subtank when the destruction of the hot and cold water mixing layer generated during reheating operation during the remaining hot water in the main tank.

[0007] With this configuration, the hot water supply is switched from the main tank to the sub-tank even when a shower or the like is used at the time of destruction of the hot-water mixture layer that occurs during the boiling in the remaining hot-water state due to partial use of hot water in the main tank. As a result, hot water supply from the sub tank without a feeling of lull is performed.

[0008]

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.

[0009]

FIG. 1 is a block diagram of a hot water supply type hot water supply apparatus.
Denotes a main tank, which employs a hot water supply system of a first stop push-up type. A main water supply pipe 2 connected to a water supply pipe is connected to a lower part of a main tank 1, and a hot water supply pipe 4 is connected to an upper part thereof. The hot water supply pipe 4 is provided with a main hot water supply valve 5. The hot-water supply pipe 3 is connected to, for example, a hot-water supply tap 6 installed in a bathroom, a kitchen, a washroom, or the like.

A first tank is provided near the lower portion of the main tank 1.
The circulation pipe 7 is connected in series with a branch valve 8 as a switching means, a heat exchanger 9, a circulation pump 10 for forcibly circulating hot and cold water in the main tank 1, and a main valve 11 in series. ing.

A first hot water temperature sensor 12 and a second hot water temperature sensor 13 for detecting the hot water temperature and the remaining hot water amount in the main tank 1 are provided on the outer wall of the body of the main tank 1.
A feedwater temperature detection sensor 14 for detecting a feedwater temperature guided into the main tank 1 is provided.

Reference numeral 15 denotes a sub tank, which is a main tank 1
And is formed in a smaller capacity than the main tank 1. Reference numeral 16 denotes a second circulation pipe, a branch valve 8, a heat exchanger 9, a circulation pump 10, and a sub-valve 29.
Are sequentially connected in series. Reference numeral 17 denotes a boiling detection sensor for detecting boiling. Reference numeral 18 denotes a hot water supply pipe provided with a sub hot water supply valve 19, which is connected to the hot water supply pipe 3. Further, a sub water supply pipe 30 is provided at a lower part of the sub tank 15.
Is connected.

Reference numeral 20 denotes an evaporator as a heat pump collector, which includes an accumulator 21, a compressor 22, and a condenser 2.
3 and a switching valve 24 as a switching means are sequentially connected in series to form a closed circuit, in which a refrigerant is sealed.
Reference numeral 25 denotes a fan for sending outside air to the evaporator 20.

Reference numeral 26 denotes a solar collector, and the evaporator 20
And a heat collection temperature sensor 27 is provided. The switching valve 24 is switched by the temperature signal of the temperature sensor 27 to switch between the heat pump heat collecting operation and the solar heat collecting operation. Reference numeral 28 denotes a control device as operation control means. The control device 28 includes a first hot water temperature sensor 12 and a second hot water temperature sensor 1.
3. Water supply temperature detection sensor 14, boiling detection sensor 17
When a detection signal from the heat collection temperature sensor 27 or the like is input, the control device 28 controls the main hot water supply valve 5,
The branch valve 8, the circulation pump 10, the main valve 11, the sub valve 29, the sub hot water supply valve 19, the compressor 22, the condenser 23, the switching valve 24, the fan 25, and the like are controlled.

The controller 28 switches from the main tank 1 to the sub-tank 15 based on the hot water temperature and the hot water temperature detected by the first hot water temperature sensor 12, the second hot water temperature sensor 13, and the hot water temperature detecting sensor 14. It has the function of driving. Further, the control device 28 has an operation control function of operating one of a solar heat collecting operation and a heat pump heat collecting operation in accordance with the heat collecting temperature detected by the heat collecting temperature sensor 27.

Next, the main tank 1 and the sub tank 15
Will be described. First, water is supplied to the main tank 1 and the sub tank 15 through the main water supply pipe 2 and the sub water supply pipe 30, respectively. The main valve 11 is opened and the sub valve 29 is closed, and the branch valve 8 is connected to the main tank 1 side. It is assumed that has been switched to.

Under such a condition, when the amount of sunshine exceeds a predetermined value, such as sunny weather, when the condition of the solar heat collecting operation is satisfied by the heat collecting temperature sensor 27, the switching valve 24 is moved to the solar heat collector 26 side. The compressor 22 is switched and the compressor 22 is driven. Thereby, the refrigerant flows in the order of the compressor 22, the condenser 23, the switching valve 24, and the accumulator 21, as indicated by the solid arrow in FIG.

The refrigerant vaporized by the solar heat in the solar collector 26 is sent to the condenser 23 to be liquefied, and the heat of the refrigerant is transferred from the condenser 23 to the water in the first circulation pipe 7 through the heat exchanger 9. Heat exchange.

At this time, the circulation pump 10 is driven, and FIG.
The water on the lower side of the main tank 1
Is forcedly circulated back into the main tank 1 through the circulation pipe 7, and the entire amount of water in the main tank 1 is heated to a relatively low temperature.

Next, when the entire amount of the main tank 1 is heated, a signal is sent from the first hot / cold water temperature sensor 12 to the control device 28, the main valve 11 is closed, and the sub-valve 29
Is opened, and the branch valve 8 is switched to the sub tank side.

As a result, the water on the lower side of the sub-tank 15 is forcibly circulated through the second circulation pipe 16 so as to return to the sub-tank 15 again as indicated by the dashed arrow in FIG. Until the detection, the entire amount of water in the sub tank 15 is heated to a relatively low temperature.

When the solar heat collecting conditions are not satisfied, such as when the amount of sunlight falls below a predetermined level on a cloudy day or a rainy day, a heat pump heat collecting operation is performed, and the main tank 1 and the sub tank 15 can be boiled to a relatively low temperature.

That is, when the temperature of the heat collecting temperature sensor 27 becomes lower than a predetermined temperature, the controller 28 switches the switching valve 24 to the evaporator 20 side, and the compressor 22 and the fan 25 are driven. As a result, the refrigerant flows in the order of the compressor 22, the condenser 23, the switching valve 24, the evaporator 20, and the accumulator 21, as indicated by the dashed arrow.

The refrigerant exchanged with the outside air by the evaporator 20 is compressed by the compressor 22 and liquefied in the condenser 23, and the heat of the refrigerant is transferred from the condenser 23 to the first heat collector in the same manner as in the solar heat collecting operation. The circulation pipe 7 and the second circulation pipe 16 are sequentially switched to boil the water in the main tank 1 and the sub tank 15.

The hot water in the main tank 1 and the sub-tank 15 boiled in this way is usually opened by opening the main hot-water supply valve 5 of the main tank 1 and closing the sub-hot-water supply valve 19, and The water is supplied to a bathroom, a kitchen, a washroom, and the like through hot water tap 6 from hot and cold water.

When the hot water in the upper part of the main tank 1 is partially used, the remaining hot water in the upper part of the main tank 1 decreases, and water is supplied from the lower part of the main tank 1 so that the hot water A, hot water A mixed layer B and a layer with water C are sequentially formed.

As described above, when the layers of the hot water A, the hot and cold water mixed layer B, and the water C are sequentially formed from the upper part of the main tank 1, the solar water collection layer is formed on the water C layer according to the amount of sunlight as described above. An additional heating operation is performed by a heat operation or a heat pump heat collection operation. In this additional heating operation, as described above, the hot and cold water mixing layer is destroyed as time elapses, and the hot water A in the upper portion of the main tank 1 and the hot water C in the lower portion are mixed, and the entire hot water in the main tank 1 is temporarily cooled. The temperature will drop.

As described above, when the hot and cold water mixing layer is broken, the temperature of the hot and cold water in the entire main tank 1 drops by several degrees from the hot and cold water temperature. The breaking point of the hot and cold mixed layer is determined by the first hot and cold temperature sensor 12, the second
The temperature of the hot and cold water temperature sensor 13 and the temperature of the water supply temperature detection sensor 14 are lower than the normal boiling temperature and are equal to each other.

The control device 28 receives the detection signals from the first hot water temperature sensor 12, the second hot water temperature sensor 13 and the feed water temperature detection sensor 14, and switches the branch valve 8 from the main tank 1 to the sub tank 15 The main hot water supply valve 5 is closed and the sub hot water supply valve 19 is opened to prepare for hot water supply such as a shower.

When the user uses hot water such as a shower when the hot / water mixed layer is broken, the hot water supply is switched to the sub-tank 15 side. In addition, when the hot water is supplied from the sub-tank 15, the boiling operation in the main tank 1 is continued.

Since the capacity of the sub-tank 15 is smaller than that of the main tank 1, it is possible to efficiently boil a necessary amount at the time of destruction of the hot and cold mixed layer. Further, in the present embodiment, the case where the solar and heat pump heat collecting operations are switched is described, but the present invention is also applied to the case where both the solar and heat pump heat collecting operations are simultaneously operated.

[0032]

According to the hot water storage type hot water supply device of the first aspect, the hot water supply source is switched from the main tank to the sub tank when the hot / water mixed layer in the main tank is destroyed.
When the user uses hot water such as a shower, hot water supply without a feeling of lull is obtained.

[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 characteristic diagram showing a temperature of the hot water above the mixed layer and a temperature of the hot water above the mixed layer when the hot water mixing layer in the main tank of the hot water storage type hot water supply device is broken.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main tank 3 Hot water supply pipe 4 Hot water supply pipe 5 Main hot water supply valve 7 First circulation pipe 8 Branch valve as a switching means 10 Circulation pump 11 Main valve 12 First hot water temperature sensor 13 Second hot water temperature sensor 14 Water supply temperature Detection sensor 15 Sub tank 16 Second circulation pipe 17 Boiling detection sensor 18 Hot water supply pipe 19 Sub hot water supply valve 20 Evaporator 22 Compressor 23 Condenser 24 Switching valve as switching means 25 Fan 26 Solar collector 27 Heat collecting temperature sensor 28 Control device 29 Sub valve

Claims (1)

[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 one of the evaporator and the solar collector to the condenser, or a switching means capable of selecting both of the evaporator and the solar collector, and performing either one of the heat pump collecting operation and the solar collecting operation In a hot-water storage type hot water supply device for boiling water in a tank through a condenser and a heat exchanger by one or both heat collecting actions, the tank is provided in parallel with a main tank having a main valve and the main tank. A sub-tank having a sub-valve, and switching means for switching between hot water supply to the main tank and the sub-tank. A hot-water supply type hot-water supply device characterized in that when the hot-water mixture layer is broken, the hot water supply from the main tank to the sub-tank is switched.