Exergy Evaluation of Direct Sewage Source Heat Pump System

Sewage source heat pump system plays a significant role in energy-saving and environmental protection which can be divided into direct and indirect system. For the shortcoming of research on the direct one, some anti-scaling technology and the heat exchangers to remove the soft dirt are introduced. Based on the exergy method, an analysis is given of energy efficiency in the direct sewage source heat pump. The conclusions are educed by an example that exergy efficiency is higher 4% or 6.5% at the heating or cooling condition in the direct system than the indirect one.