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【中文摘要】 小时变化系数Kh是计算集中热水供应系统设计热水流量及耗热量的一个重要参数。从定义和数值两方面对国内外的小时变化系数进行了研究分析。指出科学地测定各类热水用户的用水情况对于形成和完善适合我国自己的各种热水供应定额、小时变化系数等基础数据体系具有深远的意义。 【英文摘要】 The coefficient of variation per hours is an important parameter to calculate hot water flow rate and heat consumption in a centralized hot water supply system design. The article analyzes the research findings home and abroad on the coefficient of variation per hours. And it indicate scientifical determination about use of water by various types of water users is profound for the formation and perfection of fixed hot water supply and the coefficient of variation per hours suited to China's. 【中文关键词】 生活给水; 小时变化系数; 设计流量 【英文关键词】 water supply; the coefficient of variation per hours; design flow