本文对相变热水器进行了热性能优化分析,并提出了设计方案。换热器设计、工质和充装量的选择是影响系统性能的关键因素。在北京地区供暖期内,该热水器防冻可靠,平均日效率在35％以上,明显优于其它类型热水器,成为一种技术经济性能良好的全年用家庭热水装置。 In this paper, phase change water heater thermal performance optimization analysis and proposed design. Heat exchanger design, the choice of working fluid and filling volume are the key factors affecting the system performance. During the heating period in Beijing, the water heater is antifreeze reliable with an average daily efficiency of over 35%, which is obviously superior to other types of water heaters and becomes a year-round domestic hot water plant with good technical and economical performance.