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摘要 ：从空调工程寿命周期能效评价角度，提出了空调工程装机能效比和综合运行能效比概念和计算方法，介绍了既有建筑空调工程能效诊断方法、分级分项能效指标体系和能效判定基本步骤，探讨了空调工程能效判定的基本条件，通过案例简要分析了开展空调工程能效诊断需要解决的相关基础理论问题。 关键词 ：既有公共建筑,空调工程,能效诊断,装机能效比,综合运行能效比 Discussion on energy efficiency diagnosis for air conditioning engineering in existing public buildings By Yu Xiaoping★, Fu Xiangzhao and Xiao Yimin Abstract ：From the view of the life cycle analysis theory, puts forward the concepts and calculating method for installation energy efficiency ratio and integrative running energy efficiency ratio. Presents the energy efficiency diagnosis method, energy efficiency index system and basic program of energy efficiency decision. Discusses the basic conditions of energy efficiency decision for air conditioning projects. With a case, analyses related fundamental research problems that should be solved in energy efficiency diagnosis. Keywords ：existing public building, air conditioning project, energy efficiency diagnosis, installation energy efficiency ratio, integrative running energy efficiency ratio ★Chongqing University, Chongqing, China