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The effective sky temperature: an enigmatic concept

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Abstract

To properly simulate the condensation process and design a water recovery system from condensation of atmospheric water vapour on a surface maintained below the dew point by radiative heat loss from the surface to night sky, an accurate estimation of the effective sky temperature is required. To estimate the effective night sky temperature, an experimental system consisting of a series of metal plates embedded on a heat transfer panel, a weather station and a control system was used. The results obtained from theoretical analyses and preliminary experiments are presented and discussed. A special emphasis is given to a mathematical solution of the system of equations that need to be solved to obtain the effective sky temperature. It is shown that although the system of equations works well for the direct heat transfer problem, there is a serious difficulty to solve the inverse heat transfer problem to retrieve the desired parameters.

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Acknowledgments

The authors gratefully acknowledge the financial support for this project provided by the Natural Science and Engineering Research Council of Canada.

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Authors and Affiliations

  1. Department of Chemical and Biological Engineering, University of Ottawa, Ottawa, ON, K1N 6N5, Canada

    Omemah Gliah, Boguslaw Kruczek & Jules Thibault

  2. Department of Chemical Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran

    Seyed Gh. Etemad

Authors
  1. Omemah Gliah
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  2. Boguslaw Kruczek
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  3. Seyed Gh. Etemad
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  4. Jules Thibault
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Correspondence to Jules Thibault.

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Gliah, O., Kruczek, B., Etemad, S.G. et al. The effective sky temperature: an enigmatic concept. Heat Mass Transfer 47, 1171–1180 (2011). https://doi.org/10.1007/s00231-011-0780-1

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  • DOI: https://doi.org/10.1007/s00231-011-0780-1

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