Microchannel evaporator has a great effect on the heat transfer efficiency, and has broad application prospects in the field of air conditioning refrigeration, electronic components, etc., but the problem of uneven refrigerant flow distribution seriously affects the performance of two-pass microchannel evaporator. Based on the two-pass microchannel evaporator, a new gas ducting device is designed with R134a as the simulation medium to compare the flow distribution and heat transfer of each flat tube with different depth parameters of the gas ducting device by means of numerical simulation. The results show that the two-phase length of the microchannel evaporator increases by 5% on average after adding the gas ducting device, and the greater the inlet flow is, the more obvious the improvement is. The uneven distribution of the total flow after the improvement is reduced by 31% ~ 48%, and the heat transfer is increased by 21%.
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xue et al. (2024) studied this question.
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