Study on heating system with multi-source heat pump for greenhouse

To fully and efficiently use renewable energy for greenhouse heating because of the shortages of the traditional heating methods for greenhouse, a set of experimental device of heating system with multi-source heat pump for greenhouse was designed and developed. In this study, the performances and heating effects of the heating system with multi-source heat pump were analyzed through these experiments. The results show that the system operates stably under different weather conditions and the heating effects is remarkable. The daily average temperatures of greenhouse soil elevated 1-2℃ while the indoor air daily cweraye is evelated temperature increased by 2-5℃ in average per day. Besides, the energy saving and economic benefits of the system were also evaluated in this study. It's indicated that the comprehensive performance coefficient, namely COP value, is between 5 and 6, which is obviously better than that of other forms of heat pump system. Compared to conventional energy(like oil, gas, electricity),the operating cost of the system with multi-source heat pump is saved more than 73%. © 2019, Editorial Board of Acta Energiae Solaris Sinica. All right reserved.