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순음 성 에어컨 냉매 유동음 개선의 이론적 접근 및 실험적 고찰
정원혁(Wonhyuek Jeong),박영덕(Youngduk Park),나민균(MinKyun Na) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
Vehicle manufacturers are demanding a high quality and performance. In particular, the level and demand of NVH is increasing. Refrigerant flow noise from evaporator inside HVAC is one of the most important part of passenger’s comfort and feeling. It is occurs in various forms under various conditions. But most of them occur under Air Conditioner start or overload conditions. So, refrigerant flow noise have a general bandwidth spectrum, 2~10KHz. Contrary to general noise, abnormal flow noise has a peak frequency. In this study, various test and theoretical approach is adopted for solving the abnormal refrigerant flow noise. Based on the Strouhal Number theory and experimental results, It was found joint of between evaporator and pipe is the major factor for generating the Noise.