An air-conditioning heat pump subcooling system and its working method

Abstract

The invention discloses an air-conditioning heat pump subcooling system, comprising a compressor, a four-way valve, a first heat exchanger, a second heat exchanger, a third heat exchanger, a fourth heat exchanger, a first one-way valve, The second one-way valve, the first throttling part, the second throttling part, the third throttling part, the fourth throttling part, the liquid reservoir, the first stop valve and the second stop valve, the four-way valve has There are four interfaces S, C, E, and D. The first heat exchanger is provided with two first heat exchange tubes and second heat exchange tubes that are parallel to each other. The first heat exchange tube is provided with a and B interface, the second heat exchange tube is provided with c and d interfaces, and the fourth heat exchanger is provided with two third heat exchange tubes and fourth heat exchange tubes that are close to each other in parallel, and the third heat exchange tube The heat pipe is provided with e and f interfaces, and the fourth heat exchange tube is provided with g and h interfaces, and the main flow, enthalpy-increasing flow path and enthalpy-increasing branch are formed by connecting the above-mentioned components, so that the supercooling system of the present invention has supercooling function and defrost function.

Description

technical field [0001] The invention relates to the technical field of air-conditioning heat pumps, in particular to an air-conditioning heat pump supercooling system and a working method thereof. Background technique [0002] Some refrigeration systems of existing air energy heat pump products lead the liquid outlet pipe of the heat exchanger to the bottom of the heat exchanger to melt ice for supercooling. The refrigerant is supercooled, but both of these two supercooling methods are insufficient. [0003] In the first solution, when the ambient temperature is too high, frost cannot form on the heat exchanger. At this time, the supercooling tube is supercooled by the air in the environment, which will limit the supercooling efficiency, and during the supercooling process, the air The heat taken away is not absorbed and utilized, resulting in heat loss in the refrigeration system and affecting the heating capacity of the system. The existing solution is to install a chassi...

AI Technical Summary

Problems solved by technology

[0002] Some refrigeration systems of existing air energy heat pump products lead the liquid outlet pipe of the heat exchanger to the bottom of the heat exchanger to melt ice for supercooling. The refrigerant is supercooled, but both of these two supercooling methods are insufficient

[0003] In the first solution, when the ambient temperature is too high, frost cannot form on the heat exchanger. At this time, the supercooling tube is supercooled by the air in the environment, which will limit the supercooling efficiency, and during the supercooling process, the air The heat taken away is not absorbed and utilized, resulting in heat loss in the refrigeration system and affecting the heating capacity of the system. The existing solution is to install a chassis heating belt at the bottom of the heat exchanger to remove the bottom of the heat exchanger and the chassis sump The icing on the surface will lead the heat exchanger out of the pipe to melt the ice, which will cause energy overlap and waste, and will also cause greater heat loss; in the second scheme, when the ambient temperature is higher than a certain value, the refrigeration system will The enthalpy-increasing branch above is closed, and the refrigerant coming out of the heat exchanger does not perform heat exchange and cooling when it flows through the plate heat exchanger. With the increase of the condensation temperature, the cooling capacity of the system decreases, the power of the compressor increases, and the exhaust temperature With the increase, the temperature of the lubricating oil increases and the viscosity decreases, which directly affects the reliability and life of the compressor.

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