An Experimental Research on the Application of Ground Source Heat Pump and Floor-Heating System in the Greenhouse

This paper presents an experimental research on greenhouse heat supply in winter taking the ground source heat pump as the heat source and the floor-heating system as the heating method. The experiment reveals that the application of floor-heating system in greenhouse allows a decreasing trend of the indoor vertical temperature distribution from the plant roots to crowns and finally to the upper space of the greenhouse and a small circadian temperature difference that are advantageous for plant growth. Experimental greenhouse heating system, with a COP value of 3.79, may conducing to saving 47.4％ of energy compared to the greenhouse using coal-fired boiler and floor-heating system, or even saving as much as 62.5％ of energy by contrast with the greenhouse based on coal-fired boiler and traditional heating system.