Experimental study on anti-freezing of solar heating system in severe cold zone

Establishes an experiment platform to research the anti-freezing operating modes and control strategies of the solar energy utilization system in Harbin. The thermal energy in solar collectors is used as the energy resource to prevent freezing in this system. Under different outdoor conditions and operating modes, tests the temperature variation of the fluid in outdoor pipe. The results suggest that it can keep the temperature 15℃ higher than that of the environment, and further the volume fraction of antifreeze can be reduced from 50% to 30%. In addition, this anti-freezing strategy is more reliable, safer and more economical than the traditional anti-freezing measures.