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Design of Control System of Parallel Solar Assisted Heat Pump Water Heater

Zhang Jiancheng,Wu Yongming,Miao Wenping(Faculty of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006,China)  
Among all the solar assisted heat pump water heater,the paralle type is the most easily promoted.According to the integrated problem that exists in the control of the parallel solar assisted heat pump water heater,on the basis of analyzing requirements of the control system of the parallel solar assisted heat pump water heater,the control method associating with water-level、difference in temperature and time is applied.The realization principle、hardware structure and controlling data flow of the control system are studied based on ATmega48.The system can select automatically solar-energy or air-energy heat-pump to make hot water according to weather and water temperature.Combined with the functions of fault self-diagnosis for key facilities、delay protection for compressor and automatically defrosting,the control system can improve the stability and thermal efficiency of the water heater under the low temperature.The results show that 23%of the average energy efficiency have been improved by using the integrated control system.
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