Modelling of radiative PAR transfer in a tunnel greenhouse. (English) Zbl 1009.92027
Summary: The modelling of radiative photosynthetically active radiation (PAR) transfer is required to enable light distribution in greenhouses to be determined. Thus, studies test the accuracy of a well-known radiation model for plastic tunnel greenhouses. The radiation was measured inside and outside a single plastic-covered tunnel greenhouse and compared with calculations performed with the model suggested by R. Rosa et al. [J. Agric. Eng. Res. 42, 221-229 (1989)] (Rosa model). The average transmissivity was around \(80\%\) on cloudy days and \(78\%\) on sunny days. Model calculations were \(7\%\) lower on cloudy days and \(24\pm 12\%\) higher than measurements on sunny days, which shows that more complex models taking account of shadows cast by the frame and changes in transmission resulting from condensation and dust have to be used. Additionally, the accuracy should also be improved by using a more accurate physical model that allows for diffuse and direct irradiance, reflection, transmission, scattering and shading.
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