TITLE:
Numerical Modelling of Radiation-Convection Coupling of Greenhouse Using Underfloor Heating
AUTHORS:
Yan Jia, Can Wang, Chi Zhang, Wenxiong Li
KEYWORDS:
Greenhouse, Underfloor Heating, Radiation-Convection Coupling, CFD
JOURNAL NAME:
Open Journal of Fluid Dynamics,
Vol.7 No.3,
September
28,
2017
ABSTRACT: Greenhouse is an important place for crop growth, and it is necessary to control
the temperature of growing environment in winter. In addition, the root
temperature underground also plays a decisive role for plants growth. Adopting
underground heating to increase the temperature can effectively improve
the yield of crops. The objective of our study was to model the heat transfer of
greenhouse underfloor heating which is analyzed and simplified based on the
FLUENT software by changing the several important factors that affect the
temperature distribution: pipe diameter, pipe spacing, laying depth, supplied
water temperature and flow rate, as boundary conditions to simulate the
changes of the soil temperature field around the winter night environment.
Researching the temperature distribution of the greenhouse, the soil surface
and the plant root layer under the different parameters and the basic rules of
the heating system are summarized. The results show that the water supply
temperature, pipe spacing and diameter of the pipe has a greater impact on
the ground and room temperature, and the laying depth has greater impact on
the temperature uniformity of the ground, the velocity of water in pipe has little
impact on the uniformity of ground temperature.