Thermal Environment of Chinese Solar Greenhouses: Analysis and Simulation

文献类型： 外文期刊

第一作者： Xu, F.

作者： Xu, F.;Xu, F.;Ma, C.;Zhao, S.;Liu, Y.;Hu, B.;Wang, S.;Li, S.;Han, J.

作者机构：

关键词： Greenhouse design;Ground level;Heat transfer;Mathematical model;Wall materials

期刊名称：APPLIED ENGINEERING IN AGRICULTURE （ 影响因子：0.985； 五年影响因子：1.02 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Chinese solar greenhouse is the most common protected horticulture facility in China. The design of solar greenhouses has been evolving but few designs were based on solid engineering analyses and extensive field testing. This article analyzed three aspects that contribute to their good thermal performance: high solar transmittance of the South facing roof due to limited structural and equipment shading, interception and heat buffering of solar radiation by opaque walls and ground, and good insulation of the North facing roof, wall, and sidewalls. A mathematical model is presented to predict and evaluate the thermal environment of solar greenhouses. The model is based on the heat balance and the heat exchange between the system components. Simulations and analyses using the solar greenhouse model suggest the following: 1) materials with good heat insulation should be used for the outer layer of walls, and those with high thermal conductivity and volumetric specific heat should be used for the innerlayer, 2) the gained benefits in terms of air temperature and heat flows released from walls to the inside air start to become marginal as the wall thickness increases, and3)by lowering indoor ground the thermal environment of solar greenhouses can be greatly improved. An optimal wall thickness can be determined by weighing the improvements of the thermal environment against the increase in cost associated with material selection and construction.

分类号： S2

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