Analysis of flow and heat transfer characteristics of porous heat-storage wall in greenhouse

Abstract

The flow and heat transfer characteristics of porous heat-storage wall in greenhouse are studied by using the one-dimensional steady energy two-equation model for saturated porous medium. The results show that the heat exchange between the air and the solid matrix of the porous heat-storage wall depends upon the inlet air velocity, the porosity and the permeability of porous medium, and the thermal conductivity of the solid matrix. Because the incidence of solar radiation on the porous heat-storage wall is not uniform, the new composite porous solar wall with different porosity is proposed to reduce the disadvantageous effect.

References

1. Chen Duansheng, Zhang Haishan, Liu Buzhou . Comprehensive study on the meteorological environmentof sunlight greenhouse-preliminary study on the thermal effect ofthe wall body and covering materials. Transactionsof CSAE, 1990, 6(2): 77–81
2. Kang Shuhua, Chen Duansheng . Study on the structure optimizationof sunlight greenhouse. Transactions ofCSAE, 1997, 12(A00): 30–35
3. Fuller R J, Meyer C P, Sale P J M . Validation of a dynamic model for predicting energy usein greenhouse. Agr Eng Res, 1987, 38(1): 1–14. doi:10.1016/0021-8634(87)90134-X
4. Jolliet O, Danloy L, Gay J-B, et al.. Horticern: An improved static model for predictingthe energy consumption of a greenhouse. Agricultural and Forest Meteorology, 1991, 55(3,4): 265–294. doi:10.1016/0168-1923(91)90066-Y
5. Liu Wei, Fan Aiwu, Huang Xiaoming . Theory and application of heat and mass transfer in porousmedia. Beijing: Science Press, 2006
6. Guo Zengyuan, Huang Suyi . Field Coordination Principleand New Techniques in Heat Transfer Enhancement. Beijing: China Electric PowerPress, 2004