Application of ground-source heat pump and floor heating system to greenhouse heating in winter

According to the characteristics of superficial geothermal energy, ground-source heat pump(GSHP) and floor heating were used for the greenhouse heating in winter. The ground-source heat pump greenhouse heating system was installed in a Venlotype test greenhouse of the Chinese Academy of Agricultural Sciences. The results showed that the temperature of greenhouse in the vertical direction decreased with the increase of height, and the temperature in the horizontal direction was well distributed and helpful to plant growth. The actual heating coefficient of performance(COP) of the GSHP was 3.14. The experimental greenhouse heated by GSHP saved energy by 36.3%, compared with that in the greenhouse heated by coal fuel.