Abstract: With the popularization of parallel flow evaporator in household air conditioning, the research on sound quality has been carried out gradually, when the wind direction of the parallel flow evaporator is not parallel to the blower, the abnormal fin noise sound is more likely to occur, in order to improve the abnormal fin sound of parallel flow evaporator of household cabinet machine, a 9-point weighted average noise subjective evaluation method is proposed, combined with CFD simulation and experimental test, the influence of the size and swing angle of the built-in air deflector on the subjective evaluation of abnormal fin sound and the performance of the air duct was investigated, 300×70mm air deflector with 30°swing is selected as the optimal scheme. Under the condition of satisfying the performance index of air duct, the sound perception of the fins of the cabinet is improved obviously.

Key words: Parallel flow evaporator, Subjective evaluation of noise, Abnormal fin noise, Built-in air deflector