Heat gain due to the absorption of solar radiation by the pool is given by qs = oHt (5.29)
where qs = rate of solar radiation absorption by the pool (MJ/m2-d). a = solar absorptance (a = 0.85 for light-colored pools; a = 0.90 for dark-
colored pools). Ht = solar irradiation on a horizontal surface (MJ/m2-d).
It should be noted that the solar absorptance, a, is dependent on the color, depth, and pool usage. For pools with continuous intensive use (public pools), an additional reduction of 0.05 should be made to the absorption factor (ISO/ TR, 1995a).
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