Estimates of clear night sky emissivity in the Negev Highlands, Israel

Runsheng Tang, Y. Etzion, I. A. Meir

    Research output: Contribution to journalArticlepeer-review

    77 Scopus citations


    A simple method was introduced to estimate the atmospheric emissivity of clear night skies based on the water temperature variation inside an open shallow pond. The method used the pond as an absorber of atmospheric radiation by measuring the water evaporation rate from the pond to ambient air and then calculating the heat loss inside the pond due to the radiative heat exchange between the pond and sky dome. An empirical correlation for the calculations of clear night sky emissivity in the Negev Highlands, Israel, was found. It showed that the emissivity of clear night sky in the Negev Highlands is slightly lower than that expected by Berdahl et al. and Clark's correlations under the climatic conditions during the period of measurements.

    Original languageEnglish
    Pages (from-to)1831-1843
    Number of pages13
    JournalEnergy Conversion and Management
    Issue number11-12
    StatePublished - 1 Jul 2004


    • Hot arid regions
    • Sky emissivity
    • Water evaporation rate

    ASJC Scopus subject areas

    • Renewable Energy, Sustainability and the Environment
    • Nuclear Energy and Engineering
    • Fuel Technology
    • Energy Engineering and Power Technology


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