Please use this identifier to cite or link to this item: https://dr.ddn.upes.ac.in//xmlui/handle/123456789/4220
Title: Investigation into sky temperature estimation, its variation, and significance in heat transfer calculations of solar cookers
Authors: Karn, Asish
Chintala, Venkateshwarlu
Kumar, Suresh
Keywords: Published Papers
Mechanical Engineering
Radiation Heat Transfer
Radiative Cooling
Sky Emissivity
Issue Date: 8-Apr-2019
Publisher: Wiley
Abstract: The determination of sky temperature assumes great importance in engineering applications such as radiative cooling of buildings. Many studies that involve a radiative exchange with the sky employ different reported models of sky temperature interchangeably. However, until now, hardly any systematic study has been done to quantify the errors/variations that might be encountered in calculating this radiative exchange employing these different correlations. In the current paper, first, a thorough analysis has been presented on the sky temperature correlations and a possible range of variation in sky temperature based on the estimation of sky emissivity is computed. Both diurnal-nocturnal variation in sky temperature and seasonal disparities in sky temperature have been reported. Next, the case of a box-type solar cooker has been taken up for investigation with respect to the possible influence of the sky temperature estimation in predicting its performance parameter, first-figure-of-merit on a daily, seasonal, and climatic basis. Our observations show an enormous difference in sky temperature depending upon the expressions of emissivity from which it is derived. The variability of sky temperature has a nominal influence on the prediction of first-figure-of-merit, although a marked discrepancy is observed across the seasons at the same location.
Description: Paper published in the journal Heat Transfer - Asian Research, 2019, 48(5), Pp. 1830-1856
URI: https://doi.org/10.1002/htj.21459
http://hdl.handle.net/123456789/4220
Appears in Collections:Published papers

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