Abstract
Top heat loss coefficient (Ut) is required for thermal performance evaluation of a box- type solar cooker. In the present work, the values of Ut were obtained from outdoor experiments undertaken to determine the First Figure of Merit (F1). Ut was found to vary from summer to winter. Acomparison of values of Ut obtained from the experiments with the values obtained from analytical equation showed the same trend. The effect of use of measured value of outer glass cover temperature (T2), or estimated value of T2, on Ut computed by analytical equation was also studied. The measurement of T2 was found to be not essential for obtaining Ut by this equation. As obtaining T2 by experiments also involves uncertainties, one might prefer to use existing correlations for T2.
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