Sewage Source Heat Pump System Design And Performance Evaluation

The sewage-source heat pump system with sewage as cold and heat source,make full use of the energy contained in waste water, not only can save energy and also is of great significance to protect the environment. Economic and environmental benefit of sewage source heat system have been recognized by most scholars.In this paper, the research on sewage-source heat pump system is combined with the actual project. Firstly, carried out a detailed system design and equipment matches selection for the project, and the models of four parts of air conditioning is established.Secondly, based on the designs and models and use MATLAB software as the simulation platform, the simulation of the heat pump system is carried out.Finally, this paper selected the sewage-source heat pump system with several common system of economy, energy saving, environmental protection comprehensive comparison.Through the study found:(1) The larger the fouling resistance is, heating and refrigeration coefficient of performance will be reduced, but the influence of fouling resistance for summer cooling is bigger than the winter heating;The fouling resistance increased from 0 to 1(m2.K)/kW, and the reduction of the heat and refrigeration performance coefficient were 25.2% and 11.96% respectively.(2)The sewage flow rate, the greater the cooling and heating performance coefficient is larger, but the growth rate gradually decreased. Finally, the heat and refrigeration performance coefficients were stable at 4.16 and 8.09 respectively.(3) The sewage-source heat pump system compared with coal-fired boilers, chillers, etc, in such aspects as initial investment, annual operating cost is a cost is the least, investment cost can save up to nearly half, and is also the most optimal in terms of energy conservation and environmental protection.