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对双级压缩制冷循环,确定其中间温度是全部运算的关键环节。但因中间温度是多个变量的函数,同时各变量之间又有着隐函关系,因此,单纯利用数学推导的方法,是很难得到中间温度的解析式的。为此,以往在工程设计和调整运算中,一般均采用目前各设计手册上介绍的试算加图解的方法(简称手册法),以便求取较为精确的中间温度值。但这种方法相当麻烦,每计算一个中间温度,至少得先假定两个中间温度,然后利用各种图表,查取近20个
The two-stage compression refrigeration cycle, to determine the middle temperature is the key to all operations. However, since the intermediate temperature is a function of multiple variables and there is a implicit relationship between the variables, it is difficult to obtain the analytical solution of the intermediate temperature by simply using the mathematical derivation method. To this end, in the past in engineering design and adjustment calculations, the current commonly used in the design of the trial version of the trial and explanation on the method of drawing (referred to as the manual method), in order to obtain a more accurate intermediate temperature value. However, this method is rather cumbersome. For each calculation of an intermediate temperature, at least two intermediate temperatures must be assumed first, and then, using a variety of charts,