抄録
Heat exchangers for air-conditioners generally consist of aluminum fins and copper tubes. The performance of the heat exchangers had been improved by heat transfer enhancement on the fins and on the tubes for several decades. In recent years, however, the conventional methods of heat transfer enhancement are coming close to the limit due to some problems in practical use. And the heat exchangers have various factors that can deteriorate the performance. This paper shows some techniques that have been developed to improve the performance of the heat exchangers and, additionally, new trials by which more remarkable heat transfer enhancement is intended.
