Study of Performance of Heat Pump Usage in Sewage Treatment and Fouling Impact on System

A heat pump using disposed sewage as a heat source to heat raw sewage is presented to solve the problem that sewage temperature is low in sewage biologic treatment in cold region. According to the status of one medicine factory in Harbin, China, system performances are simulated. Then the impact of fouling on system performance is emulated in detail. The results show that the novel system is feasible to be utilized in sewage treatment for its energy-saving and high efficient characteristics, and that raw sewage temperature can be enhanced to 29.569?, and EER of system can reach 4.177. Fouling impact on system not only depends on the fouling thermal resistance, but also is related to heat transfer coefficient. Increased fouling leads to severely deteriorated performance of the compressor, and a decrease in EER and refrigerant mass flow rate