熱回路網法による空気調和用熱交換器性能の予測 : パスパターン適正化による蒸発器能力向上と気流バイパス抑制(熱工学,内燃機関,動力など) Prediction of Performance of a Heat Exchanger by Thermal Network Method : Improvement of an Evaporator's Performance and Restraining an Air Flow Bypass by Adjusting Refrigerant-Flow Path Pattern(Thermal Engineering)

This paper presents an influence of latent heat load by changing relative humidity of air flow on distribution of super-heated gas region in an evaporator and an effect of refrigerant flow path pattern. To estimate the influence, we applied thermal network method that can take refrigerant quality distribution in the heat exchanger into account. If super-heated gas region spreads to upper wind row, humid air goes through the heat exchanger without drying, which means "air flow bypass". To suppress this phenomenon and simultaneously obtain the best performance, we chose optimum path pattern on the basis of this method. As a result the prediction shows that performance of the evaporator is recovered by 5% for a simple 2 rows and 2 paths heat exchanger when 40% of unbalance of air flow rate occurs.