蒸発器管内冷媒の流動特性と熱輸送を考慮した 冷蔵庫除霜運転の効率向上に関する研究

－第2 報：単列モデルによる除霜評価－

抄録

This study focuses on characteristics of refrigerant flow and heat transfer inside the evaporator tube to improve performance of defrosting for refrigerator. In the first report, evaluation of refrigerant vapor-liquid two-phase flow using the test sections of single-row model simulating the refrigerator evaporator was examined under heating condition, and basic flow characteristics was clarified. In this report, evaluation of refrigerant flow and heat transfer under defrosting condition using the same test section of single-row aluminum fin-tube model was carried out. It was made clear that during defrosting, refrigerant vapor generated in the lower part of the test section went up to the upper part with lifting liquid, and then condensed at the upper part with releasing heat. Released heat due to condensation contributed to the frost melting. This heat transport by refrigerant vapor from lower part to upper part was significantly effective in the frost melting at the upper part of the test section far from the heater. As the results, the defrosting finishing time was reduced.