Multi-layer heat exchanger and using method thereof

Abstract

The invention provides a multi-layer heat exchanger and a using method thereof. The structure of the multi-layer heat exchanger is effectively improved in consideration of the influence of the pressure drop of a refrigerant on the temperature, the design that the first layer, communicated with a refrigerant inlet directly, of the multi-layer heat exchanger is set as a leeward layer in the prior art is abandoned, the arrangement sequence of all layers of the multi-layer heat exchanger is enabled to meet the counterflow design principle, and compared with a conventional multi-layer heat exchanger, the multi-layer heat exchanger, provided by the invention, has a good cooling effect.

Description

technical field [0001] The invention relates to a multilayer heat exchanger and a method for using the same, belonging to the field of air conditioner heat exchangers. Background technique [0002] Existing multilayer heat exchangers generally include multiple layers consisting of headers, flat tubes and fins. When the multilayer heat exchanger is used as an evaporator, theoretically, when the heat exchanger is used as an evaporator , since the refrigerant continuously absorbs heat from the outside during the flow process, its temperature should continue to increase. That is to say, among multiple layers of a multi-layer heat exchanger used as an evaporator, the temperature of the refrigerant in the layer that the refrigerant flows into first should be the lowest, and the temperature of the refrigerant in each subsequent layer should be lower than that of the subsequent layer. The temperature of the refrigerant in one layer, and the temperature of the refrigerant in the lay...

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Problems solved by technology

[0003] However, in the actual use of the heat exchanger as an evaporator, when the refrigerant flows inside the heat exchanger, its pressure will continue to decrease, and the pressure drop will cause the temperature of the refrigerant to decrease to a certain extent

In some parts of the above-mentioned refrigerant flow path, the cooling effect caused by this depressurization process may offset or even exceed the heating effect caused by the refrigerant absorbing heat from the outside

In this way, for the multi-layer heat exchanger, although the refrigerant in the first layer that the refrigerant flows into absorbs the least heat from the outside, since this layer is directly connected to the refrigerant inlet, the refrigerant in it has just flowed into the multi-layer heat exchanger. In the heat exchanger, the pressure has not been fully reduced, and the cooling effect caused by the pressure reduction is not obvious, so this layer may not be the layer with the lowest refrigerant temperature in the entire heat exchanger

Therefore, using the layer where the refrigerant flows first as the leeward layer of the multi-layer heat exchanger may actually not conform to the counterflow design principle, and it is difficult to achieve the best cooling effect

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