文中还针对线性化模型的应用范围局限性，提出了“变负荷数学模型”
Taking account of the limits existed zin the scope of application of the linear models, a mathematical model for different load conditions is proposed for consideration.
然而，系统中的综合负荷，由于具有构成复杂、随机时变、地域分散等特点，其准确的数学模型一直没有建立起来。
However, for the composite load has the characteristics of complex composition, random time variance and spread over different area, its exact mathematics model is still not built up.
集中供冷系统仿真数学模型的主要特点是压缩机可以根据蒸发器总负荷大小选择性开关不同的档位，相应的输入输出参数也随之改变。
And the capacities of compressor could be selected by on-off switch along with the change of burthen of evaporator, which is a main characteristic of the central refrigeration system model.
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