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Multi-heat exchanger series transcritical CO2 heat pump heating system

A heating system and heat exchanger technology, applied in the field of multi-heat exchanger series transcritical CO2 heat pump heating system, can solve the problems such as the need to improve the uniformity of heat exchange, the decrease of heating efficiency, and the increase of the outlet temperature of an air cooler, Achieve the effect of improving the uniformity of heat exchange, reducing the irreversible loss of heat exchange, and improving the total energy efficiency

Inactive Publication Date: 2020-06-12
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the return water is first heated by the auxiliary loop before entering the CO 2 air cooler, which will further raise the CO 2 air cooler outlet temperature such that CO 2 Decreased heating efficiency
At the same time, the heat transfer uniformity of the two-stage heating needs to be improved

Method used

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  • Multi-heat exchanger series transcritical CO2 heat pump heating system

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Embodiment

[0036] refer to figure 1 , this embodiment provides a multi-heat exchanger series transcritical CO 2 Heat pump heating system, including first compressor 1, first air cooler 2, second air cooler 3, cooling evaporator 4, first throttling device 5, low temperature evaporator 6, second compressor 7, condenser 8 and the second throttling device 9,

[0037] The first air cooler 2, the second air cooler 3 and the condenser 8 are all refrigerant-brine heat exchangers, equipped with refrigerant passages and brine passages, and the cooling evaporator 4 is a refrigerant - a refrigerant heat exchanger with dual refrigerant passages, the low-temperature evaporator 6 is a refrigerant-air heat exchanger with refrigerant passages and air passages,

[0038] The exhaust port of the first compressor 1, the refrigerant passage of the first air cooler 2, the refrigerant passage of the second air cooler 3, one of the refrigerant passages of the cooling evaporator 4, the first throttling device ...

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Abstract

The invention relates to a multi-heat exchanger series transcritical CO2 heat pump heating system which comprises a first compressor, a first air cooler, a second air cooler, a cooling evaporator, a first throttling device, a low-temperature evaporator, a second compressor, a condenser and a second throttling device. The first compressor, a refrigerant channel of the first air cooler, a refrigerant channel of the second air cooler, one refrigerant channel of the cooling evaporator, the first throttling device and a refrigerant channel of the low-temperature evaporator are sequentially connected through a pipeline to form CO2 transcritical circulation loop. The second compressor, a refrigerant channel of the condenser, the second throttling device and the other refrigerant channel of the cooling evaporator are sequentially connected through a pipeline to form an auxiliary circulation loop. A secondary refrigerant channel of the second air cooler, a secondary refrigerant channel of the condenser and a secondary refrigerant channel of the first air cooler are connected through a pipeline form a water supply flow path. According to the system, the heat exchange uniformity can be improved, and the overall energy efficiency of the CO2 heat pump heating system is improved.

Description

technical field [0001] The present invention relates to a CO 2 Heat pump heating system, especially involving a multi-heat exchanger series transcritical CO 2 Heat pump heating system. Background technique [0002] In order to improve the environmental pollution caused by coal-fired heating, the state has proposed a clean heating policy of "coal-to-electricity" and fully implemented it in the north. Among the common alternatives, the air source heat pump uses outdoor air as the heat source, which has high heating efficiency and is more energy-efficient than pure electric heating. However, traditional air source heat pumps using freon as a working medium have poor heating effects in cold environments, and there are also hidden dangers of environmental pollution caused by leakage. [0003] In recent years, it has been proposed that the CO 2 Transcritical cycles are used for heating in winter. CO 2 As a pure natural working fluid, it is clean and safe, and will not cause ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24D3/18F25B30/06F25B41/06F25B41/34
CPCF24D3/18F25B30/06F24D2200/123F25B2309/061F25B41/30
Inventor 张春路何宇佳成家豪常萌萌
Owner TONGJI UNIV
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