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Numerical Modelling of Radiation-Convection Coupling of Greenhouse Using Underfloor Heating

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Document pages: 15 pages

Abstract: Greenhouse is an important place for crop growth, and it is necessary to controlthe temperature of growing environment in winter. In addition, the roottemperature underground also plays a decisive role for plants growth. Adoptingunderground heating to increase the temperature can effectively improvethe yield of crops. The objective of our study was to model the heat transfer ofgreenhouse underfloor heating which is analyzed and simplified based on theFLUENT software by changing the several important factors that affect thetemperature distribution: pipe diameter, pipe spacing, laying depth, suppliedwater temperature and flow rate, as boundary conditions to simulate thechanges of the soil temperature field around the winter night environment.Researching the temperature distribution of the greenhouse, the soil surfaceand the plant root layer under the different parameters and the basic rules ofthe heating system are summarized. The results show that the water supplytemperature, pipe spacing and diameter of the pipe has a greater impact onthe ground and room temperature, and the laying depth has greater impact onthe temperature uniformity of the ground, the velocity of water in pipe has littleimpact on the uniformity of ground temperature.

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