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介绍了两种系统的具体形式,分析了两种系统蒸发温度相等时蒸发器传热面积的差异及蒸发器传热面积相等时蒸发温度的差异。比较了两种系统的经济性、运行能耗及可靠性。结果表明,当蒸发温度相等时,间接式系统污水换热器的换热面积是蒸发器传热面积的3~5倍,直接式系统蒸发器的传热面积比间接式系统大0.4~0.7倍;而当蒸发器传热面积相等时,直接式系统蒸发器的蒸发温度比间接式系统低3~4℃才能提取相同的热量;直接式系统的投资不一定低于间接式系统,其能耗最多低4%~5%,相对于间接式系统而言,是不可靠的。
The concrete forms of the two systems are introduced. The differences of the heat transfer area of the evaporator when the two systems’ evaporation temperature are equal and the evaporation temperature of the evaporator when the heat transfer area is equal are analyzed. Comparing the economics of both systems, operating energy consumption and reliability. The results show that when the evaporation temperature is equal, the heat transfer area of the indirect system sewage heat exchanger is 3 ~ 5 times of the heat transfer area of the evaporator, and the heat transfer area of the direct system evaporator is 0.4 ~ 0.7 times larger than the indirect system ; When the heat transfer area of the evaporator is equal, the evaporation temperature of the direct system evaporator is 3-4 ° C lower than that of the indirect system to extract the same heat; the direct system investment is not necessarily lower than the indirect system, and its energy consumption Up to 4% to 5% lower, relative to the indirect system is not reliable.