Abstract: In order to study the influence of fin type on the cooling and heating performance of the whole machine and the defrosting of low-temperature environment, three kinds of fin type condensers were tested. The results show that the heat transfer effect of the bridge type heat exchanger is the best and that of the flat type heat exchanger is the worst under the same system configuration under the refrigeration and high-temperature heating conditions without frost; Under the low-temperature heating condition (unstable operation and frosting condition), the corrugated plate heat exchanger has the best heat exchange effect, the bridge plate heat exchanger has the worst heat exchange effect, and the frost formation of the bridge plate heat exchanger is the most serious. When designing a heat exchanger, the fin type should be selected based on its heat exchange efficiency and use scenarios.

Key words: Household air conditioner, Condenser, Energy efficiency, Fin