A double-row microchannel heat exchanger and its working method

Abstract

The invention discloses a double-row microchannel heat exchanger and a working method thereof. The double-row microchannel heat exchanger comprises four liquid collecting tubes, flat tubes, fins, three ball valves, an electromagnetic expansion valve and a gas-liquid separator. When the double-row microchannel heat exchanger is used as an evaporator and works under the frosting condition, a refrigerant coming out of a front-row microchannel heat exchanger is throttled, so that the double-row microchannel heat exchanger can frost evenly; when the double-row microchannel heat exchanger works under the non-frosting condition, the refrigerant does not pass through the electromagnetic expansion valve; when the double-row microchannel heat exchanger is used as a condenser, the flow of the refrigerant entering the front-row microchannel heat exchanger is increased through adjustment of the opening degrees of the ball valves; the gas-liquid separator is mounted between the front-row microchannel heat exchanger and a back-row microchannel heat exchanger, the gas and the liquid which are produced by the double-row microchannel heat exchanger used as the evaporator and the condenser can be connected in a bypass manner, and thus the performance of the second half of the microchannel heat exchanger can be improved.

Description

technical field [0001] The invention relates to the technical field of double-row micro-channel heat exchangers, in particular to a double-row micro-channel heat exchanger and a working method thereof. Background technique [0002] In the context of energy consumption and air pollution, heat pump systems with high energy efficiency have received more and more attention. As a key component of heat pump systems, heat exchangers play a key role in improving the energy efficiency of the system. Microchannel heat exchangers with small size, compact structure, small refrigerant charge and low production cost have great advantages and can be used in heat pump systems instead of finned tube heat exchangers. [0003] For conventional double-row micro-channel heat exchangers, the flow path of the refrigerant is from the front row of micro-channel heat exchangers to the rear row of micro-channel heat exchangers, or from the rear row of micro-channel heat exchangers to the front row of ...

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Problems solved by technology

[0003] For conventional double-row micro-channel heat exchangers, the flow path of the refrigerant is from the front row of micro-channel heat exchangers to the rear row of micro-channel heat exchangers, or from the rear row of micro-channel heat exchangers to the front row of micro-channel heat exchangers , the refrigerant temperature and flow rate of the front and rear rows of microchannel heat exchangers are not controlled, which generally leads to poor heat transfer performance of the rear row of microchannel heat exchangers, and under frosting conditions, the front row of microchannel heat exchangers The heat exchanger is very easy to frost, which leads to a sharp deterioration of the heat exchange performance of the rear micro-channel heat exchanger; when the double-row micro-channel heat exchanger is used as an evaporator or condenser, the micro-channel heat exchanger will generate gas during the heat exchange process , liquid, if the gas and liquid are not drawn out, the heat exchange capacity of the second half of the microchannel heat exchanger will be poor

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