Micro channel heat exchanger for air-conditioner heat pump

Abstract

The invention discloses a micro channel heat exchanger for an air-conditioner heat pump. The heat exchanger comprises an upper head pipe, a lower head pipe, a plurality of flat pipes and a plurality of fins, wherein the upper head pipe is parallel with the lower head pipe; the plurality of flat pipes connect the upper head pipe and the lower head pipe and are parallel at intervals; opening holes communicating with the insides of the upper head pipe and the lower head pipe are reserved in the flat pipes; the plurality of fins are arranged between adjacent flat pipes along the length direction of the flat pipes; and the distribution density of the fins is reduced gradually from the upper head pipe to the lower head pipe along the length direction of the flat pipes. According to the micro channel heat exchanger, the air side heat transfer coefficient of the heat exchanger can be improved and the air side flow resistance can be reduced; and the surface tension born by condensate water on the surfaces of the flat pipes is low both under cooling and heating working conditions and the condensate water is hard to stay in gaps of the fins, so that the wind resistance is reduced and heat transfer is not influenced, the discharge of the condensate water is improved, and frost formation is also improved at the same time.

Description

technical field [0001] The invention relates to the cold and heat exchange technology of an air conditioner, in particular to a microchannel heat exchanger used in an air conditioner heat pump. Background technique [0002] At present, the heat pump type air conditioner is a kind of heating and cooling air conditioner that is often used. When cooling in summer, the air conditioner cools indoors and dissipates heat outdoors; while heating in winter, the direction is opposite to that in summer, that is, heating indoors and cooling outdoors. The air conditioner exchanges heat and cold between different environments through a heat pump. For example, in winter, outdoor air, surface water, groundwater, etc. are low-temperature heat sources, while indoor air is a high-temperature heat source. The function of heat pump air conditioning is to transfer heat from the outdoor environment to the indoor environment. [0003] refer to figure 1 As shown, a schematic diagram of a heating ...

AI Technical Summary

Problems solved by technology

Whether it is the accumulated condensed water or the frost layer on the surface, it will directly reduce the heat transfer coefficient of the air side of the heat exchanger, increase the flow resistance of the air side, deteriorate the performance of the unit, and reduce the heat supply capacity of the unit

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