Abstract

With the continuous application of sewage source heat pump technology, research on key technologies in direct sewage source heat pump systems (DSSHPS) is becoming more and more important. The sewage heat exchanger (evaporation in winter, condensation in summer) is the core component of the system, and its correct thermodynamic calculation and reasonable structural design are more critical. In this paper, the sewage flooded evaporator and condenser are taken as examples. Considering the flow characteristics of sewage, the heat exchanger adopts smooth inner wall tube; combines with practical engineering; designs and calculates the two heat exchangers in the direct sewage source heat pump unit by using MATLAB software. The results show that increasing the flow rate of sewage in heat exchanger can increase the flow rate, and increasing the flow rate of sewage in pipe can improve the heat transfer coefficient of sewage side and reduce the fouling thermal resistance. However, increasing the flow velocity in the tube will increase the flow resistance, so it is necessary to comprehensively consider the flow resistance and heat transfer area of the heat exchanger when determining the flow velocity to improve the heat transfer effect. In the sewage heat exchanger, it is more reasonable to use the sewage flow of 4, and the tube arrangement is more reasonable to concentrate the heat exchange tube in the shell center.

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