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指出并更正了原文的概念错误。明确了在设计工况以低于设计流量运行是不可取的 ;在非设计工况减少循环流量运行也必须遵守一定法则 ;给出了变工况分析的计算公式
Pointed out and corrected the conceptual error of the original. It is unacceptable that the design conditions should be operated at less than the design flow rate. It is also necessary to abide by some laws to reduce the circulation flow operation in the non-design conditions. The calculation formula of the change condition analysis is given