Abslraet--A statistical procedure has been employed to develop correlations between the hourly gl... more Abslraet--A statistical procedure has been employed to develop correlations between the hourly global horizontal radiation and its diffuse component. Several years', hourly radiation data from three Canadian stations and two French stations have been employed for this purpose. The relationships have been developed in dimensionless form which predict IJlo for particular solar altitudes when I/Io is given.
Optimum collector slope for a liquid base active solar heating system employing flat-plate collec... more Optimum collector slope for a liquid base active solar heating system employing flat-plate collectors was investigated. The optimum collector slope was studied as a function of (a) collector area, (b) yearly total heating load and (c) the ratio of space heating load to service hot water load. Collectors facing equator only were considered. Such a system was studied in four different Canadian locations having widely different climates. Under the above conditions, optimum collector slope varied with the amount of collector area employed. The optimum collector slope was invariant with the yearly total load itself, or the spac.e heating to hot water load ratio. Contrary to the widely held belief, for the four locations investigated, the optimum collector slope varied from lat.-100 to lat. + 150; depending upon f, the fraction of load supplied by the solar system. When fy is in 10-20 per cent range, optimum collector slope is Int.-10" and increases almost linearly to Int.+ 15 ° at fy in 80 per cent range. Consequently, when the fraction of load by the solar system is low, a flat roof may be profitably employed. On the other hand, when the fraction by the solar system is high, a south facing (for northern hemisphere) vertical wall may be profitably employed.
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