Evaluation of optical properties and thermal performances of different greenhouse covering materials
Evaluation of optical properties and thermal performances of different greenhouse covering materials
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DOI：
10.1016/j.solener.2013.06.029
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发表时间：
2013-10-01
期刊：
影响因子：
6.7
通讯作者：
Maruyama, S.
中科院分区：
文献类型：
--
作者：
Al-Mahdouri, A.;Baneshi, M.;Maruyama, S.
采用反演方法获得了4种温室覆盖材料（低密度聚乙烯（LDPE）、聚烯烃（PO）、聚氯乙烯（PVC）和熔融石英玻璃）的光谱光学特性。采用分光光度法测量了覆盖材料的漫反射率和透射率;采用射线发射模型（REM 2）的辐射单元法通过反算推导出了复折射率在0.22和25 μ m之间的范围。在长波辐射下，利用Kramers-Kronig方法求出了不透明玻璃材料的光学常数，与其它研究结果有很好的相关性。建立了农业温室辐射传热分析的严格模型。温室覆盖材料作为一个非灰色的一维平面平行介质进行太阳能和热辐射使用REM 2分析。在边界面处处理了镜面反射和漫入射辐射，并考虑了吸收和发射。对上述覆盖材料的热性能进行了评价。(c)2013爱思唯尔有限公司保留所有权利。
An inverse method was conducted to obtain the spectral optical properties of four greenhouse covering materials, (Low Density Polyethylene (LDPE), Polyolefin (PO), Polyvinylchloride (PVC) and Fused Silica Glass). Diffuse reflectance and transmittance of the covering materials were measured using spectrophotometric method; the complex index of refraction in the range between 0.22 and 25 mu m was deduced by inverse calculation using Radiative Element Method by Ray Emission Model (REM2). At longwave radiation, the optical constants of opaque glass material were found by utilizing Kramers-Kronig method resulting good correlation with results obtained by other investigations. A rigorous model for radiative heat transfer analysis to an agricultural greenhouse was developed. The greenhouse covering material was analyzed as a non-gray one-dimension plane-parallel medium subjected to solar and thermal irradiation using REM2. Specular reflectance and diffuse incident irradiation were treated at the boundary surfaces and absorption and emission were taken into account. Thermal performance was evaluated for the above mentioned covering materials. (c) 2013 Elsevier Ltd. All rights reserved.