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CO2 cross-critical air source heat pump system for efficient utilization of multi-terminal low-temperature heat energy

An air source heat pump and transcritical technology, which is applied in heating systems, hot water central heating systems, heat pumps, etc., can solve the problems of high cost for small households, little significance for energy saving, complex systems, etc. Bathroom hot water demand, the effect of broad development prospects

Pending Publication Date: 2020-01-10
ZHEJIANG AMA & HIEN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These technologies are helpful to improve the efficiency of heat pumps, but they cannot completely solve the problem, and some technologies have not yet been popularized in households. In addition, these technologies will more or less complicate the system and lead to increased costs. For The cost is too high for small households, and energy saving is of little significance

Method used

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  • CO2 cross-critical air source heat pump system for efficient utilization of multi-terminal low-temperature heat energy
  • CO2 cross-critical air source heat pump system for efficient utilization of multi-terminal low-temperature heat energy
  • CO2 cross-critical air source heat pump system for efficient utilization of multi-terminal low-temperature heat energy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: Normal working mode.

[0029] Such as figure 1 As shown, the normal working mode of the system has two cycles, heat pump cycle and water cycle. In the water circulation system under normal working mode, the fifth cut-off valve 21 and the sixth cut-off valve 22 are closed, the fourth cut-off valve 20 and the seventh cut-off valve 23 are opened, and the high-temperature heating terminal 17 is connected to the low-temperature heating terminal 18 and are respectively in different positions. room, the two are connected in series to work, absorb the heat released in the air cooler 3, and then heat the room. The low-temperature heating terminal (such as: floor radiant heating terminal) can be installed in the bathroom, kitchen, storage room, etc. that are not used for a long time, and the high-temperature heating terminal (such as: radiator) can be installed in the bedroom that needs to ensure comfort, so as to ensure the best Good heating comfort. The high-te...

Embodiment 2

[0030] Example 2: Low-temperature heating terminal working mode or high-temperature heating terminal working mode

[0031] Such as figure 1 As shown, in some special cases the occupants may stay in one room so it is not necessary for both heating devices to be activated. In the present invention, four shut-off valves are added in the water circulation system to control two heating equipments. For example, only the low-temperature heating end is required to work but not the high-temperature heating end, that is, the fourth and sixth stop valves are closed, and the fifth and seventh stop valves are opened. When only the high-temperature heating end is required to work but not the low-temperature heating end, Close the seventh stop valve and open the fourth, fifth and sixth stop valves. At the same time, the second air cooler is also working, continuously heating tap water to produce sanitary hot water and store it in the water tank, such as figure 2 This part can also be rem...

Embodiment 3

[0032] Example 3: Hot gas bypass defrosting mode

[0033] Such as figure 1 As shown, when the temperature of the surface of the evaporator 9 is lower than the dew point temperature in the air, the water vapor in the air will gradually condense on the surface of the evaporator to form a frost layer, which is a very common phenomenon in winter in the north. In the present invention, the hot gas bypass defrosting system is used for CO 2 In the transcritical air source heat pump system, when the frost layer on the evaporator is too thick to affect the work, the fourth cut-off valve is closed and the fifth cut-off valve is opened. At this time, the high-temperature CO discharged from compressor 1 2 The refrigerant will flow through the fifth cut-off valve and directly enter the air-cooled evaporator for defrosting, and the CO after heat exchange 2 After the refrigerant flows through the gas-liquid separator 10, it enters the compressor to complete the cycle.

[0034] During the ...

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Abstract

The invention discloses a CO2 cross-critical air source heat pump system for efficient utilization of multi-terminal low-temperature heat energy. The system comprises a heat pump cycle, a water cycleand a sanitary hot water cycle. According to the CO2 cross-critical air source heat pump system, indoor heating can be ensured, sanitary hot water can be conveniently prepared, and stable and efficient operation of the system is guaranteed. The indoor heating is realized by adopting multiple tail ends, a low-temperature heating tail end and a high-temperature heating tail end are connected in series at an outlet of a water tank, furthermore, control is carried out through four stop valves, the requirements of household comfort can be met, excessive waste can not be caused, and thus the above effects can be achieved. When a frost layer is generated on the surface of an evaporator in winter, the system can quickly defrosting without causing the system to be greatly affected, and thus normaloperation of the system in a reasonable working range is guaranteed. The CO2 cross-critical air source heat pump system for efficient utilization of the multi-terminal low-temperature heat energy cansolve the problems of low efficiency and high defrosting cost of an existing heat pump.

Description

technical field [0001] The invention belongs to heat pumps and relates to a direct heating heat pump. Background technique [0002] Heat pumps can use a small amount of driving energy to transfer heat from low-temperature heat sources to objects whose temperature is higher than the ambient temperature. The conventional working fluids of heat pumps, HCFC and HFC, have the negative effects of destroying the ozone layer and aggravating the greenhouse effect, which is not conducive to sustainable development. Therefore, in recent years, Come on CO 2 Transcritical air source heat pump has become the key research and development object in the field of heat pump. This is because on the one hand, CO 2 The working medium is more environmentally friendly and easy to obtain; on the other hand, due to the supercritical nature of the working medium in the air cooler, it is especially suitable for producing hot water with a higher temperature through countercurrent heat exchange, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B30/06F25B30/02F25B41/06F25B43/00F25B49/02F25D21/12F24D3/18F25B41/30
CPCF25B30/06F25B30/02F25B43/003F25B49/02F25D21/12F24D3/18F25B41/30
Inventor 徐英杰黄元躬
Owner ZHEJIANG AMA & HIEN TECH
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