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分析空调热泵系统泄漏浓度与初始充灌浓度的关系，提出不燃初始充灌浓度区的概念及计算方法；给出几种已被国内外确认的CFCs，HFCFs替代物系的不燃初始充灌浓度区；对各种不同性质的物系，讨论系统泄漏率对其内部工质浓度及不燃初始充灌浓度区的影响及相关因素．
The relationship between leakage concentration of air-conditioning heat pump system and initial filling concentration was analyzed. The concept and calculation method of initial filling concentration zone of non-combustible gas were put forward. Several non-combustible initial filling concentration regions of CFCs and HFCFs substitute systems confirmed at home and abroad ; For various types of systems, discuss the impact of system leakage rate on the concentration of its internal working fluid and initial filling concentration of non-flammable area and related factors.