Analysis and experimental verification of an improved cooling radiator

E. Erell, Y. Etzion

    Research output: Contribution to journalConference articlepeer-review

    38 Scopus citations


    Roof ponds cooled by nocturnal long wave radiation have often been proposed as a cheap and effective means of providing thermal comfort in buildings in hot-arid locations. Many of the schemes incorporate flat-plate radiators through which the water is circulated at night to be cooled. This paper analyzes the parameters affecting the performance of such a radiator, specifically designed for nocturnal radiative cooling. A cheap, simple and flexible design for a cooling radiator was suggested as a result of the analysis, and tested at the experimental facilities of the Center for Desert Architecture at Sede-Boqer, Israel. The mean nightly cooling output of the radiator - due to the combined effect of radiation and convection - was over 90 watts/m2 under typical desert meteorological conditions. The analytical model adapted for this application allows accurate calculation of the fluid temperature at the outlet of the radiator, as a function of the properties of the radiator, the meteorological conditions and the operating parameters of the cooling system.

    Original languageEnglish
    Pages (from-to)700-703
    Number of pages4
    JournalRenewable Energy
    Issue number1-4 -4 pt 2
    StatePublished - 1 Jan 1999
    EventProceedings of the 1998 World Renewable Energy Congress V. Part 2 (of 2) - Florence, Italy
    Duration: 20 Sep 199825 Sep 1998

    ASJC Scopus subject areas

    • Renewable Energy, Sustainability and the Environment


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