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摘要 给出了建筑物室内负荷分布特征的描述方法。以制冷工况下室内机容量连续调节的多联机为对象，模拟研究了室内负荷分布不均匀性对多联机系统部分负荷特性的影响规律。指出在室内外环境参数不变的条件下，多联机空调系统在部分负荷下的COP存在一个由负荷率和负荷不均匀性指数决定的性能域，并分析了影响性能域形状的因素。 关键词 多联机空调系统 部分负荷 性能域 负荷率 负荷不均匀性指数 Performance domain of multiple-split air conditioning systems By Zhao Wei，Zhou Dehai and Shi Wenxing Abstract Puts forwards the description method of the indoor load distribution characteristics. Taking the multiple?split air conditioning (MSAC) system with the indoor units whose capacity is continuously regulated in refrigeration conditions as example, studies the influence of indoor load distribution unevenness on the part load performances of the MSAC system. Finds that when the indoor and outdoor conditions keep constant, the COP of the system will be within a performance domain related to the system load ratio and the indoor load unevenness index. Analyses the factors influencing the shape of the performance domain. Keywords multiple-split air conditioning system, part load, performance domain, load ratio, load unevenness index