Flow and Inlet Temperature Effects on the Efficiency of Solar Thermal Collector

The aim of this paper is to improve the efficiency of solar energy in coupled heating system with conventional energy and solar energy in cold region,so as to make full use of the renew-able energy. Taking a residence heated by conventional energy associated with solar energy in Shenyang area as a research object,a mathematical model for the plate solar collector was built and the solar collector efficiency during changing of the inlet flowand temperature in collector was analyzed. Results showthat when the flows are controlled by 0. 04 kg / s,0. 08 kg / s and 0. 12 kg / s,the corresponding collector efficiencies are 58%,61% and 62%,respectively; when the inlet temperatures are 0 ℃ and 30 ℃,the corresponding effeciencies are 85% and 25%. Conclusion is that all of the collector coating,the transmittance,the collector inlet flowand temperature have effects on the thermal efficiency of solar collector.