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【中文摘要】 本文以直热式空气源热泵热水器中的套管式冷凝器为研究对象,讨论了在设计工况下,由于过冷度变化而引起的冷凝器过热区、两相区和过冷区的传热温差、传热系数、换热量、换热面积以及COP相对值的变化,为研究不同过冷度下冷凝器的传热性能提供了方便而有效的方法。 【英文摘要】 The double-pipe condenser of instantaneous air-source heat pump water heater was taken as the research object.According to certain design criteria,the variations of heat transfer temperature difference,heat transfer rate,heat transfer coefficient,heat transfer area,and the relative value of COP in the superheating zone,the double phase zone and the sub-cooling zone were discussed with the variation of sub-cooling degree of condenser.A convenient and effective method was provided to research the heat transfer performance of condenser at different sub-cooling degrees. 【中文关键词】 套管式冷凝器; 过冷度; 传热温差; 换热量; 换热面积 【英文关键词】 double-pipe condenser; sub-cooling degree; heat transfer temperature difference; heat transfer quantity; heat transfer area