JPS62266358A - Solar heat collecting device - Google Patents

Abstract

PURPOSE:To add a defrosting function and prevent heat from being discharged out of a hot water storing tank during a defrosting operation by a method wherein an opening or closing valve is installed in a hot gas bypassing circuit which is arranged in parallel with a coolant-water heat exchanger, a capillary tube and a thermal expansion valve. CONSTITUTION:An opening or closing valve 20 is arranged in a hot gas bypass circuit 19 which is arranged in parallel with a coolant-water heat exchanger 3, a capillary tube 18 and a thermal expansion valve 8. During a thermal collecting operation in which no solar heat is applied, a continuation of operation at a low surrounding temperature causes frost to be adhered to a thermal collecting plate 10. As frosting continues, an evaporation temperature of coolant is decreased. This is detected by a thermistor 17 and as a frosting temperature is lower than a set temperature, an opening or closing valve 20 is opened. With this arrangement, coolant gas of hot temperature and high pressure compressed by a compressor 1 passes through the hot gas bypass circuit 19, the opening or closing valve 20 and a thermal collecting distribution pipe 6 and flows into the thermal collecting plate 10 to apply heat to the thermal collecting plate 10 and to melt frost. Thus, a defrosting operation in which a part of the coolant is condensed and passes again through the thermal collecting distribution pipe 12 and an accumulator 14 into a compressor 1 is repeated. Because heat in a hot water storage tank is not used during this defrost operation, heat loss can be presented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a solar heat collecting device using a heat pump cycle as a solar heat collecting means.

2. Description of the Related Art A conventional heat collecting device using a heat pump cycle as a means for collecting solar heat has been constructed as shown in FIG.

That is, in Fig. 2, 1 is a compressor, 2 is a four-way valve,
3! This is an RI refrigerant-to-water heat exchanger, and includes a refrigerant sluice passage 3a and a water side passage 3b. 4 is a hair dryer, 5 is a self-sea! Recano link A, 6'ri heat collection outgoing pipe,
7 is a one-shot coupling A, and 8 is a temperature-type expansion valve, which is equipped with a temperature-sensitive cylinder 8a.

9 is a check valve installed in parallel with the thermostatic expansion valve 8; 10 is a heat collecting plate; this heat collecting plate 1o is constituted by a fin tube;
The surface is also coated with a corrosion-resistant coating. Reference numeral 11 indicates a one-shot coupling B112, which is a heat collection/return pipe, and reference 13, a self-sealing coupling B114, which is an accumulation rake, which are sequentially connected in an annular manner to form a heat collection cycle using a heat pump. 15 is a hot water storage tank, 1
Reference numeral 6 denotes a water circulation pump, which is connected to the water side passage 3b of the refrigerant-to-water heat exchanger 3 to form a water circulation circuit and constitute a solar heat collector.

The solar heat collecting device also includes a heat collecting plate 10, a thermostatic expansion valve 8, a check valve 9, and one-shot couplings A7 and B1.
1, a compressor 1, a four-way valve 2, a refrigerant-to-water heat exchanger 3, a dryer 4, self-seal couplings A5 and B13, a hot water storage tank 15, and a water circulation pump 16. The solar heat collecting device is constructed by connecting the heat collector unit l-A and the hot water tank unit B with a heat collection outward pipe 6 and a heat collection return pipe 12.

Next, the operation of the heat collecting device configured as described above will be explained. The heat collecting operation is performed by driving the compressor 1 and the water circulation pump 16. That is, the high temperature and high pressure refrigerant gas compressed by the compressor 1 flows into the refrigerant side passage 3a of the refrigerant-to-water heat exchanger 3 by the action of the four-way valve 2. Here, by the action of the water circulation pump 16, heat is radiated to the hot water in the hot water storage tank 15, which is sent to the water side passage 3b of the refrigerant-to-water heat exchanger 3, and the hot water is condensed and liquefied. The condensed refrigerant is transferred to dryer 4 and self-seal coupling A.
7 and reaches a thermostatic expansion valve 8. The condensed refrigerant passes through the thermostatic expansion valve 8 and is reduced in pressure to a low temperature and pressure, and flows into the heat collecting plate 10. The refrigerant that has flowed into the heat collecting plate 10 absorbs solar heat and atmospheric heat and is sequentially gasified.
It passes through the self-seal coupling B13, the four-way valve 2, and the accumulation rake 14 and returns to the compressor 1 again. Thereafter, by repeating the same operation, the temperature of the hot water in the hot water storage tank 15 is raised sequentially.

However, if heat collecting operation is performed in a state where there is no solar radiation and the outside temperature is low, frost will form on the heat collecting plate 10 and the amount of heat collected will decrease. In this state, the thermistor 17 detects the refrigerant temperature at the inlet of the heat collecting plate 10, and when the refrigerant temperature reaches a set temperature or lower, the four-way valve 2 is operated to reverse the flow direction of the refrigerant.

As a result, the high-temperature, high-pressure refrigerant gas compressed by the compressor 1 is transferred to the four-way valve 2, and the refrigerant gas is transferred to the four-way valve 2.
The heat is sent to the heat collecting plate 10 through the heat collecting return pipe 12 and the one-shot coupling 11B, and heat is applied to the heat collecting plate 1o to melt the frost. The refrigerant that has given heat to the heat collecting plate 10 is transferred to the reversal valve 9, the air shot coupling A7, the heat collection outgoing pipe 6, the self-seal compling A5, the dryer 4, the refrigerant passage 3a of the refrigerant-to-water heat exchanger 3, A reverse cycle defrosting operation is performed in which the defrosting operation returns to the compressor 1 through the four-way valve 2 and the accumulator 14. This defrosting operation is performed on the heat collecting plate 1
Once the frost on the 0 melts, it will return to its original heat collecting operation.

Problems to be Solved by the Invention However, the above heat collecting device requires the addition of functional parts such as a four-way valve 2 and a check valve 9 for defrosting operation.
Material costs will increase. In addition, during defrosting operation, the refrigerant that has given heat to the heat collecting plate 10 passes through the refrigerant-to-water heat exchanger 3, thereby removing heat from the hot water storage tank 15. This had the disadvantage that some parts were taken out.

The present invention solves the above-mentioned problems, and provides a solar heat collection device that can add a defrosting function to the safety unit and can prevent heat from being carried out from the hot water storage tank during defrosting operation. Means for Solving the Problems In order to solve the above problems, the solar heat collector of the present invention includes a compressor, a refrigerant-to-water heat exchanger, a capillary tube,
A thermal expansion valve, a heat collection outward pipe, a heat collection plate, a heat collection return pipe, an accumulation rake, and the compressor are connected in order in a ring to form a heat collection main circuit, and the refrigerant-to-water heat exchanger, the capillary tube, A real gas bypass circuit is provided in parallel with the thermal type 1 expansion valve, and a refrigerant heat collecting circuit is provided in which an on-off valve is attached to this hot gas bypass circuit, a hot water storage tank, a water circulation pump, and a refrigerant-to-water heat exchanger described in NFJ. A hot water circulation circuit is provided in which the hot water supply tank and the hot water storage tank are connected in an annular manner in this order.

Effect of the present invention With the above-described configuration, when 1rδ adheres to the heat collecting plate, by opening the on-off valve attached to the hot gas bypass circuit, the high temperature and high pressure refrigerant gas compressed by the compressor is transferred to the real gas bypass circuit. The refrigerant circulates in the following order: , heat collection outward pipe, heat collection plate, heat collection return pipe, accumulator, and compressor, and the hot gas of this refrigerant can melt frost attached to the heat collection plate.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIG. In FIG. 1 of this embodiment, the same parts as those in FIG. 2 of the conventional example are given the same numbers to simplify the explanation.

In Fig. 1, 1 is a compressor, 3 is a refrigerant-to-water heat exchanger, and the refrigerant side passage 3a and the water side passage 3b'f:@E, and the refrigerant side passage 3a and the water side passage 3b have a heat transfer relationship. is maintained. 4 is a dryer, 18 is a capillary tube,
8 is a temperature type expansion valve, which includes a cold temperature cylinder 8a and an external pressure equalization pipe 8.
It is equipped with b.

5 is self-seal coupling A, 6 is heat collection outgoing pipe, 7
One-shot coupling A110 is a heat collecting plate, 11 is a hot shot coupling B, 12 is a heat collecting return pipe, 13
is a self-seal coupling B, 14 is an accumulation rake, and these are the compressor 1, the refrigerant side passage 3ax of the refrigerant-to-water heat exchanger 3, the dryer 4, the capillary tube 18, the thermostatic expansion valve 8, and the self-seal coupling. A5
, heat collection outgoing pipe 6, heat shot coupling A7, heat collection plate 10, heat shot coupling Bll, i heat return pipe 12, self-seal coupling 813, and accumulator 14 are connected in this order to form a heat collection main circuit. It consists of 19 is a hot gas bypass circuit, which includes the refrigerant-to-water heat exchanger 3, the dryer 4, and the capillary tube 18.
, are arranged in parallel with the temperature type expansion valve 8. 20 is an on-off valve provided in the real gas bypass circuit 19. 21 is a capillary tube attached to the pressure equalizing pipe 8b of the temperature-type expansion valve 8. 15 is a hot water storage tank, 16 is a water circulation pump, and the hot water storage tank 15, the water circulation pump 16, and the water side passage 3b of the refrigerant-to-water heat exchanger 3 are interconnected to form a water circulation circuit.

Further, the heat collecting circuit includes a heat collecting plate 10. A heat collector unit A is configured by the Funshot couplings A7 and B11, and includes a hot water storage tank 15, a water circulation pump 16, a compressor 1, a refrigerant-to-water heat exchanger 3, a capillary tube 18, a thermostatic expansion valve 8, and a self-sealing cup. rings A5 and B13,
Accumulator 14, hot gas bypass circuit 19,
A hot water storage tank unit B is constituted by an on-off valve 20, and a heat collection device is formed by connecting the heat collection unit A and the hot water storage tank unit B with a heat collection outward pipe 6 and a heat collection return pipe 12. .

Next, the operation of the solar heat collector configured as described above will be explained. The heat collecting operation is performed by driving the compressor 1 and the water circulation pump 16. During the heat collecting operation, the on-off valve 20 provided in the hot gas bypass circuit 19 is closed. That is, the high temperature and high pressure refrigerant gas compressed by the compressor 1 flows into the refrigerant side passage 3& of the refrigerant-to-water heat exchanger 3. Here, by the action of the water circulation pump 16, the refrigerant is pumped into the hot water supply in the storage tank 15, which is sent to the water measurement passage 3b of the refrigerant water heat exchanger 3, and is condensed and liquefied. The condensed refrigerant passes through the dryer 4, is first depressurized in the capillary tube 18, is further depressurized when passing through the thermostatic expansion valve 8, and then passes through the self-sealing coupling A5,
It flows into the heat collecting plate 1o through the heat collection outgoing pipe 6, the heat collection coupling A7, absorbs heat from the sun and atmospheric heat, evaporates and becomes gas, and then passes through the heat collection outward pipe 6, the heat collection return pipe 12, and the self-seal coupling. 813, it passes through the accumulator 14 and returns to the pressure machine 1. After that, by repeating the same cycle, the hot water storage tank 1
Gradually raise the temperature of the hot water in 5.

If the heat collection operation as described above is continued in a state where there is no solar radiation and the outside temperature is low, frost will form on the heat collection plate 10. In this situation, the amount of heat exchanged by the heat collecting plate 10 decreases, making it impossible to operate efficiently.

Heat collector plate 10Tf - As frosting progresses, the evaporation temperature of the refrigerant decreases. This drop in evaporation temperature is detected by the thermistor 17, and when the evaporation temperature reaches a set humidity or lower, the on-off valve 20 is opened. Thereby, the high temperature and high pressure refrigerant gas compressed by the compressor 1 is transferred to the hot gas bypass circuit 19, the on-off valve 20,
The heat flows into the heat collecting plate 10 through the self-sealing coupling A5, the heat collecting outward pipe 6, and the one-shot coupling 7, and heat is applied to the heat collecting plate 10 to melt the frost. Heat collecting plate 1
A part of the refrigerant that gave heat to 0 is condensed, and the heat collection/return pipe 12, cell 7 sealer 7
The hot gas defrosting operation is repeated by flowing the hot gas back into the compressor 1 through the brinter 14. This defrosting operation is controlled by a defrosting timer or the like, and after the heat collecting plate 10 is defrosted, the heat collecting operation is resumed.

The capillary tube 18 connected in series with the temperature-type expansion valve 8 controls the amount of refrigerant sent to the heat collecting plate 10 together with the temperature-type expansion valve 8, and controls the operating range of the temperature-type expansion valve 8. Make it small and suppress temperature hunting. In addition, the capillary tube 21 provided in the external pressure equalizing pipe 8b passes through the timer flamm of the thermostatic expansion valve 8 (
This attenuates the pressure pulsations transmitted to the area (not shown) and suppresses hunting caused by the pressure pulsations.

Effects of the Invention As described above, according to the present invention, the compressor, the refrigerant-to-water heat exchanger, the capillary tube, the thermostatic expansion valve, the heat collection outward pipe, the heat collection plate, the heat collection return pipe, and the compressor are arranged in an annular shape in this order. The heat collection main circuit is connected to the main heat collection circuit, and only the hot gas bypass circuit, which has an on-off valve in parallel with the refrigerant-to-water heat exchanger, capillary tube, and thermostatic expansion valve, is added. Defrosting operation can be performed by opening the on-off valve when the plate is frosted, and can be manufactured at low cost.

Also, during defrosting operation, the heat in the hot water tank is not taken away, so it is possible to eliminate heat loss associated with defrosting.

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram of a solar heat collector showing an embodiment of the present invention, and FIG. 2 is a system configuration diagram of a conventional solar heat collector. 1... Compressor, 3... Refrigerant-to-water heat exchanger, 6... Heat collection outgoing pipe, 8... Humidity type expansion valve, 10. ... Heat collection plate, 12 ... Heat collection return pipe, 14. River ... Accumulator, 15 ...
...Hot water storage tank, 16...Water circulation pump, 1
8... Capillary tube, 19... River/hot gas bypass circuit, 2o... Open/close valve, 21
... Capillary tube, A. River... Heat collector unit, B... Hot water storage tank unit. Name of agent: Patent attorney Michio Nakao, 18 years old, 1 year old
Figure 7 - Rumi Hichisan

Claims (1)

[Claims] The compressor, refrigerant-to-water heat exchanger, capillary tube, thermostatic expansion valve, heat collection outward pipe, heat collection plate, heat collection return pipe, accumulator, and the compressor are connected in this order in a ring to form a heat collection main circuit. A hot gas bypass circuit is provided in parallel with the refrigerant-to-water heat exchanger, the capillary tube, and the thermostatic expansion valve, and a refrigerant heat collecting circuit is provided in which the hot gas bypass circuit is equipped with an on-off valve, a hot water storage tank, and water circulation. A solar heat collecting device provided with a hot water circulation circuit in which a pump, the refrigerant-to-water heat exchanger, and the hot water storage tank are connected in order in an annular manner.