Abstract
This study focuses on characteristics of refrigerant flow and heat transfer inside the evaporator tube to improve performance of defrosting for refrigerator. In the second report, refrigerant flow and heat transfer under defrosting condition were evaluated and clarified using the test section of single-row fin-tube model. In this report, evaluation for the test section of two-row fin-tube model was carried out. It was made clear,refrigerant flow in the row connected to an accumulator was the same characteristics as those in the single-row model. But in the other row, refrigerant vapor generated in the lower part of the test section went up to the upper part without lifting liquid, and then condensed at the upper part with releasing heat. In both rows, heat released due to vapor condensation inside the tube 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.
