Performance of fin-and-tube exchanger with 6mm diameter copper tubes

摘要

In the present study the performances of fin - and - tube exchangers consist of three types of copper tubes and three types of tubes removed from the heat exchangers, respectively using HCFC- 22. Evaporation heat transfer rate at 1.0m/s of heat exchanger consist of smooth tubes was 2% higher than that of heat exchanger consist of grooved tubes. This trend was different from that of heat transfer coefficient in tube for evaporation. Therefore we must consider not only the heat transfer coefficient in tube but also tube expanding rate, air pr sore drop, and refrigerant pressure drop to estimate the evaporation heat transfer rate. Condensation heat transfer rate at 1.0m/s of heat exchanger consist of smooth tubes was 13% lower than that of heat exchanger consist of grooved tubes. This trend was same as that of heat transfer coefficients in tube for condensation. Accordingly, the condensation heat transfer rate would be comparably easily predicted by the heat transfer coefficient in tube.