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http://dx.doi.org/10.12791/KSBEC.2013.22.2.108

Estimation of Overall Heat Transfer Coefficient for Single Layer Covering in Greenhouse  

Hwang, Young-Yun (Department of Agricultural Eng., Kyungpook National Univ.)
Lee, Jong-Won (Department of Agricultural Eng., Kyungpook National Univ.)
Lee, Hyun-Woo (Department of Agricultural Eng., Kyungpook National Univ.)
Publication Information
Journal of Bio-Environment Control / v.22, no.2, 2013 , pp. 108-115 More about this Journal
Abstract
This study was conducted to suggest a model to calculate the overall heat transfer coefficient of single layer covering for various greenhouse conditions. There was a strong correlation between cover surface temperature and inside air temperature of greenhouse. The equations to calculate the convective and radiative heat transfer coefficients proposed by Kittas were best fitted for calculation of the overall heat transfer coefficient. Because the coefficient of linear regression between the calculated and measured cover surface temperature was founded to 0.98, the slope of the straight line is 1.009 and the intercept is 0.001, the calculation model of overall heat transfer coefficient proposed by this study is acceptable. The convective heat transfer between the inner cover surface and the inside air was greater than the radiative heat transfer, and the difference increased as the wind speed rose. The convective heat transfer between the outer cover surface and the outside air was less than the radiative heat transfer for the low wind speed, but greater than for the high wind speed. The outer cover convective heat flux increased proportion to the inner cover convective heat flux linearly. The overall heat transfer coefficient increased but the cover surface temperature decreased as the wind speed increased, and the regression function was founded to be logarithmic and power function, respectively.
Keywords
convective heat transfer coefficient; covering surface temperature; nocturnal radiation; radiative heat transfer coefficient;
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Times Cited By KSCI : 2  (Citation Analysis)
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