JPS6231824Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Purpose of the invention] (Field of industrial application) This invention operates a heat pump at night to store heat in a heat medium, and absorbs this accumulated heat as a heat source for the heat of evaporation of the heat pump that operates during the day. The present invention relates to a heat pump device suitable for staggered operation in which a desired high temperature is obtained by

(Conventional technology) If we consider this type of technology for heated pools, we can see that in operating a heated pool, it is necessary not only to control the temperature of hot water for the pool, but also to control the temperature of hot water for showers and heating. In many cases, this hot water was heated by burning heavy oil in a boiler or the like. However, it is known that the heat pump method may have better thermal efficiency than combustion heating, and it goes without saying that even in the heat pump method, two-stage compression has higher efficiency than single-stage compression.

However, in a heat pump cycle using a two-stage compressor as shown in Fig. 2, as is clear from the Mollier diagram shown in Fig. 3, the line indicates low-stage compression by the single-stage compressor, the line indicates intercooling by the intercooler, and the line indicates intercooling by the intercooler. The line is high-stage compression in the two-stage compressor, the line is condensation by the condenser, the line is supercooling of the liquid in pipe V, the line is expansion by the first expansion valve, the line is supercooling by the intercooler, the line is second Each state change of evaporation is performed: expansion by an expansion valve, and one-stage and two-stage compression by an evaporator and an intercooler. In this case, if the line is cooled by heat from the outside via an intercooler, there will be an enthalpy loss from the heat pump's heat account.

That is, when trying to obtain a line of condensed heat using a heat pump using two-stage compression, there is a drawback that the amount of heat corresponding to the line is lost. On the other hand, even if intercooling is performed using a self-refrigerant system rather than external heat, the heat capacity of the two-stage compressor must be increased by the amount of heat equivalent to the line. Therefore, the two-stage compressor has the disadvantage of being correspondingly larger.

In addition, conventional refrigeration equipment using two-stage compressors, such as the one described in Japanese Utility Model Application Publication No. 1983-60754, requires the low-stage and high-stage compressors to be operated simultaneously; Even when applied to a heat pump, it is not possible to operate the low-stage side in advance of the high-stage side and accumulate heat by taking advantage of the low electricity rates at night.

(Problems to be Solved by the Invention) The present invention solves the drawbacks of the prior art, has good thermal efficiency, can downsize the compressor, and provides an economical and efficient increase that is desirable for power leveling. The purpose of the present invention is to provide a heat pump device that can perform heating.

[Structure of the idea]

(Means for Solving the Problems) In order to solve the above problems, the heat pump device of the present invention includes a low-stage compressor, an evaporator, and condenses refrigerant gas discharged from the compressor. A low temperature side heat pump cycle having a low temperature side heater and a hot water facility connected to the low temperature side heater by a first water pipe, and a water heat source evaporation in which a second water pipe branched from the first water pipe communicates with each other. a high-temperature side heater, a high-stage compressor that sucks refrigerant gas from the water heat source evaporator, compresses it, and discharges it to the high-temperature side heater, and the high-temperature side heater and a third water pipe. It consists of a high temperature side heat pump cycle having a hot water storage tank connected thereto.

(Function) By operating the low-stage compressor, the refrigerant absorbs heat in the evaporator and supplies heat to the low-temperature side heater as a heat pump cycle. Can store heat. In addition, by operating the compressor on the high stage side, a part of the heat held by the first heat medium of the low temperature side heat pump cycle is transferred to the water heat source through the second water pipe branched from the first water pipe. Since the refrigerant is introduced into the evaporator, the refrigerant absorbs the heat in the evaporator and supplies the heat to the high temperature side heater as a heat pump cycle, thereby raising the temperature of the second heat medium in the hot water storage tank to a high temperature. Can be done. Then, if the compressor on the lower stage side is operated at night to store sufficient heat in the first heat medium and raise the temperature of the heat medium to a temperature higher than that required during daytime use, it is possible to In this step, both the low-stage and high-stage compressors are operated to lower the temperature of the first heat medium to the temperature during daytime use, and the amount of heat is used to raise the temperature of the second heat medium to a high temperature. be able to.

(Example) An embodiment of the present invention will be described based on the drawings.

In FIG. 4, the heat pump on the low temperature side is in a cycle. The refrigerant gas is pressurized from pressure P ₁ to pressure P ₃ (line), the heat of the line is radiated by the condenser, and the heat equivalent to the line is further radiated by the supercooler. Next, the pressure is reduced from P ₃ to P ₁ along the line by the expansion valve, and the heat of the line is absorbed by the evaporator to complete the thermal cycle. On the other hand, the heat pump on the high temperature side operates in a cycle. That is, the refrigerant on the high temperature side increases the pressure from P ₂ to P ₄ (line), radiates the heat in the line (OP) in the condenser, and then radiates and supercools the heat equivalent to the line in the supercooler. Next, the pressure is reduced from P ₄ to P ₂ along the line by the expansion valve, and the heat of the line is absorbed by the evaporator, completing the thermal cycle.

and a heat source for absorbing heat in the endothermic action (line) of the heat pump cycle on the high temperature side;
By using the same first heat medium as the heated source for heat radiation in the heat radiation action (line) of the low temperature side heat pump cycle, the low temperature side and high temperature side heat pump cycles each have a low compression ratio. While operating efficiently, high-temperature heat can be easily given to the second heat medium by the heat dissipation action (line) of the heat pump cycle on the high temperature side.

Next, an example in which the heat pump cycle described above is applied to a hot water pool will be described. In FIG. 1, a low-stage compressor 1 is connected to a low-temperature side heater (condenser) 3 via a discharge pipe 2, and a liquid pipe 4 is connected to a liquid subcooler 35 and an expansion valve 5 on the way. The air heat source evaporator 6 is connected to the air heat source evaporator 6 or another heat absorber, and the air heat source evaporator 6 and the lower stage compressor 1 are communicated through an intake gas pipe 7. The liquid pipe 4 is branched by a branch pipe 8 in the middle and communicated with a cooling water cooler or a cooler 10 for other purposes via an expansion valve 9, and a gas pipe 11 is joined to the gas pipe 7. On the other hand, the high-stage compressor 12 is connected to a high-temperature side heater (condenser) 14 via a discharge pipe 13, and a liquid pipe 15 is connected to a water heat source evaporator via a liquid supercooler 36 and an expansion valve 16 on the way. It is communicated with the container 17. gas pipe 3
4 is this water heat source evaporator 17 and the compressor 12 on the high stage side.
are communicating. Now, the low-temperature side heater 3 and the hot water pool 18 are communicated through first water pipes 19 and 20, and second water pipes 21 and 22 branch from the first water pipes 19 and 20 and have appropriate on-off valves, respectively. is connected to the water heat source evaporator 17 on the high temperature side. Further, the first water pipe 19 communicates with a cooling tower 24 via a branch pipe 23, and this cooling tower 24 is connected to a branch pipe 26 and then to the first water pipe 20 via a pump 25 along the way. The cooling tower 24 serves to adjust the temperature rise or fall of the hot water pool and compensate for excess or deficiency in heat. The first water pipe 20 of the hot water pool 18 is provided with a pump, a purification device, etc. (not shown).

Next, the high temperature heater 14
The third water pipe 27 is connected to a hot water storage tank 29, and the third water pipe 27 is provided with a plurality of showers 30 for heating and other high-temperature water usage parts, and a pressure regulating valve 31.
A pump 32 is disposed at. Reference numeral 33 indicates a supply water pipe that supplies water to the hot water tank 29.

The operation of the heat pump configured as above will be explained.

The refrigerant is pressurized from pressure P ₁ to pressure P ₃ by the compressor 1 on the low stage side, as shown in Fig. 4, enters the low temperature side heater 3 through the discharge pipe 2, and becomes the first heat medium of the hot water pool. Heat exchange is performed with the hot water in the barrel, and the condensate is transferred to liquid pipe 4.
enters the liquid, passes through the liquid supercooler 35, and a portion passes through the expansion valve 5.
The air enters the heat source evaporator 6 through the air and exchanges heat with a heat source such as outside air, and the other part enters the cooling water cooler 10 through the expansion valve 9 and exchanges heat with air conditioner water (not shown) again. Compressor 1 return. In this case, the cooler 10 may be a load such as a skating rink.

Next, the refrigerant in the cycle of the high stage compressor 12 is increased from pressure P ₂ to pressure P ₄ , enters the high temperature side heater (condenser) 14 through the discharge pipe 13, and is discharged from the hot water storage tank 29. It exchanges heat with hot water as a second heat medium, passes through a liquid pipe 15 and a liquid subcooler 36, is depressurized by an expansion valve 16, and enters a water heat source evaporator 17. In this water heat source evaporator 17, the refrigerant exchanges heat with the stored heat water from the hot water pool 18 and returns to the compressor 1.
Return to 2. That is, the low-stage compressor 1 sucks up the outside air heat source and the cooling load from the air heat source evaporator 6, cooling cooler, and other heat sources 10, respectively, and transfers the amount of heat to the low-temperature side heater 3 as a heat source in a heat pump cycle. to warm the pool water. During the night when there is no load when the pool is not used, only the compressor 1 on the low stage side continues to operate, and the pool water temperature decreases from the normal pool temperature of approximately 29℃ to approximately 33℃ due to the reduction in the pool usage load during the day. The temperature is raised to ℃.

Next, when the pool is used during the daytime on the next day, the high-stage compressor 12 is operated together with the low-stage compressor 1, and the heat stored in the pool from the previous night is used as a heat source for the water heat source evaporator 17 of the high-temperature side heater 12. The heated water at 33°C is used as a heat source by storing heat from 33°C to 29°C. The hot water in the pool communicates with the water heat source evaporator 17 via second water pipes 21 and 22 that branch from the first water pipes 19 and 20, and the temperature of the hot water decreases by heat exchange in the water heat source evaporator 17. The temperature drops from 33°C to 29°C and returns to the heated pool 18. On the other hand, the heat pump on the low-temperature side maintains the pool hot water at 29°C. That is, 4°C x (water heat source evaporator 17
This means that the amount of heat (the amount of hot water exchanged with The refrigerant flowing out from the water heat source evaporator 17 of the heat pump on the high temperature side absorbs heat equivalent to the above amount of heat and is sucked into the compressor 12 on the high stage side, so that it is heated by the heater 14 on the high temperature side. The hot water for high-temperature showers and heating at a temperature of ℃ to 70℃ is generated by adding the power heat equivalent of the high-stage compressor 12 to the above-mentioned amount of heat, and then converting the high-temperature hot water (45℃ to 70℃) into a state where the compression ratio is small. You can get it at

In this way, part of the approximately 33°C heat stored in the pool by the heat pump on the low temperature side can be used as the heat absorbed by the heat pump on the high temperature side. When raising the water temperature of a heated pool from a heat source to 29℃, or when raising the temperature of hot water for showers or space heating to 45℃ to 70℃ from an outside air heat source of 0℃ or less in winter using another heat pump using a single-stage compressor. Compared to,
Since the compression ratio of the high-stage compressor can be lowered, the volumetric efficiency is high and excellent performance is achieved, while the low-stage compressor can be made smaller by the amount of heat stored during the night. Therefore, V _L /V _H =2:1
By extending the nighttime operation, it is possible to operate with a capacity ratio of 1:1, and the compressor on the high stage side can be selected as a larger compressor than the compressor on the lower stage. In addition, in this embodiment, the hot water pool is also used as a heat storage tank, so there is no need to provide a separate heat storage tank, which has the advantage of being inexpensive, and the pool has a large volume and requires less heat radiation, so there is less heat loss. It also has the advantage of being able to survive.

As described above, this example has many excellent effects, but this implementation is not limited to pool hot water as the first heat medium, and the temperature range of the heat medium is also 29℃ and 45℃. It's not limited either.

In other words, the first heat medium is used for the required purpose only during the day, and therefore, during the night when the first heat medium is not used, the heat pump is used to increase the temperature of the first heat medium. The heat pump is raised to a temperature higher than the normal temperature during use, and the first heat medium is used for heat storage, and during the daytime, this excess accumulated heat is used to economically operate the heat pump during the daytime. This embodiment is characterized by the following points.
Therefore, this heat pump device can be very advantageously applied to various purposes that require such a first heat medium and a second heat medium.

In the above embodiment, air may be used as the first heat medium, and the warm air inside the solar house may be stored and used at night. It may be one that absorbs and utilizes the heat of warm saturated air that accumulates in the ceiling. Furthermore, it goes without saying that the second heat medium is not limited to hot water for showers or heating.

[Effect of idea]

According to the present invention, by operating the compressor on the low stage side, a sufficient amount of heat can be stored in the first heat medium in the hot water equipment by the heater on the low temperature side, and at the same time, the compressor on the high stage side can be operated. As a result, a part of the heat held by the first heat medium is introduced into the water heat source evaporator, so that the temperature of the second heat medium can be efficiently raised to a required high temperature.

In addition, the low temperature side heat pump cycle is operated at night to raise the first heat medium to an intermediate temperature higher than the temperature required during the daytime, and then the low temperature side and high temperature side heat pump cycles are operated together. Since it is possible to operate during the day and store excess heat during nighttime operation and use it as a heat source for the high-temperature side heat pump, it is possible to improve the coefficient of performance and downsize the compressor of the operated heat pump.

[Brief explanation of the drawing]

Fig. 1 is a flow sheet diagram of an embodiment of the heat pump device of the present invention, Fig. 2 is a flow sheet diagram of a conventional heat pump device, and Figs. 3 and 4 are the states of Fig. 2 and Fig. 1, respectively. It is a Mollier diagram showing changes. 1...low stage side compressor, 3...low temperature side heater,
6... Air heat source evaporator as an evaporator, 10...
Cooler as evaporator, 12... Compressor on high stage side, 14... High temperature side heater, 17... Water heat source evaporator, 18... Hot water pool as hot water equipment, 1
9, 20...first water pipe, 21,22...second water pipe, 27,28...third water pipe, 29...hot water tank.

Claims (1)

[Claims for Utility Model Registration] (1) A low-stage compressor, an evaporator, a low-temperature side heater for condensing refrigerant gas discharged from the compressor, the low-temperature side heater, and a first A low temperature side heat pump cycle having hot water equipment connected by a water pipe, a water heat source evaporator communicating with a second water pipe branched from the first water pipe, a high temperature side heater, and the water heat source evaporator. It consists of a high-stage compressor that sucks refrigerant gas, compresses it, and discharges it to the high-temperature side heater, and a high-temperature side heat pump cycle that has a hot water storage tank connected to the high-temperature side heater by a third water pipe. A heat pump device characterized by: (2) The heat pump device according to claim 1, wherein the evaporator of the low-temperature side heat pump cycle comprises an air heat source evaporator and a cooling water cooler, and the hot water facility is a hot water pool. (3) The heat pump device according to claim 2 of the utility model registration, characterized in that the third water pipe of the high temperature side heat pump cycle has a shower.