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.%Describes the specific forms of the two systems, and analyses the difference of heat transfer area of evaporator when evaporation temperature of two systems is equal and the difference of evaporation temperature when heat transfer area of evaporator of two systems is equal. Compares their economic effects, operating energy consumption and reliability. The results show that for the equal evaporation temperature, the heat transfer area of the sewage heat exchanger in an indirect system is 3-5 times as large as that of evaporator, and the heat transfer area of evaporator in the direct system is 0.4-0.7 times larger than that of the indirect system; for the equal heat transfer area of evaporators, the evaporation temperature of direct system is 3-4℃ lower than that of the indirect system; the investment of direct system is not really lower than that of indirect system, its energy consumption is lower at most by 4% to 5%, and it is unreliable.
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