Water source heat regeneration type high temperature heat pump

Abstract

The invention relates to a water source heat regeneration type high temperature heat pump. According to the water source heat regeneration type high temperature heat pump, through water source overcooling heat pump circulation, a refrigerant is deeply overcooled to ensure that an expansion valve can work reliably for a long time; through water source heat regeneration circulation, sensible heat generated by deeply overcooling the refrigerant, cooling oil and the like is recycled and used for increasing the water source inlet temperature and the evaporating temperature, reducing the compression ratio of the heat pump to ensure that the heat pump can work efficiently, and reducing the exhaust temperature of the compressor to ensure that the compressor can work reliably for a long time; and besides, unlike the multi-loop circulation in an economizer or a heat regenerator and the like, the fluctuation of heating load and water source temperature does not make the water source high temperature heat pump work unsteadily, so that an electronic expansion valve is not needed to solve the fluctuation problem.

Description

(1) Technical field [0001] The invention relates to a high-temperature heat pump of water source recovery type. (2) Background technology [0002] Among the main components used in water-source high-temperature heat pumps, the maximum exhaust temperature of the semi-hermetic screw compressor is 110°C, and the maximum limit of the inlet refrigerant temperature of the expansion valve is 68°C; therefore, when the water-source high-temperature heat pump achieves 90°C outlet water At this time, its condensation temperature has reached 95°C. Even considering the 5°C supercooling in the condenser, the temperature of the refrigerant at the inlet of the expansion valve has reached 90°C, far exceeding its maximum limit of 68°C; at this time, the non-isentropic compression exhaust Air temperature also exceeded 110°C. [0003] How to reduce the compressor exhaust temperature of the water source high temperature heat pump to below 110°C, and reduce the temperature of the inlet refrigera...

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Problems solved by technology

[0008] (3) The diameter of the air supply port of the compressor limits the subcooling degree of the high pressure side of the economizer by limiting the flow of refrigerant supply air on the medium pressure side of the economizer, usually 5 to 8°C, so that the inlet of the expansion valve of the evaporator The refrigerant temperature can only be subcooled to 82°C, which is still far above the maximum limit of 68°C, which seriously restricts the reliability of the evaporator expansion valve;

[0009] (4) The heat pump with an economizer is a dual-circuit system. Once the heating load or water source temperature fluctuates, it will cause unstable operation of the water source high-temperature heat pump, so this technology is only suitable for stable operation;

[0010] (5) Since the inlet refrigerant temperature of the economizer expansion valve is still 90°C, this seriously restricts the reliability of the economizer expansion valve

[0013] (1) An increase in the superheat of the refrigerant gas will lead to an increase in the exhaust temperature, and once it exceeds its maximum limit value, it will cause a compressor failure; therefore, this limits the increase in the degree of subcooling;

[0014] (2) The heat pump with regenerator is a dual-circuit system. Once the heating load or water source temperature fluctuates, it will cause unstable operation of the water source high-temperature heat pump. Therefore, this technology is only suitable for stable working conditions;

[0016] (4) Due to the increase in the superheat of the refrigerant gas in this technology, the exhaust temperature will further increase, so it is not suitable for water-source high-temperature heat pumps that require lower exhaust temperature

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