A “long" parapet (that is, the end effect of shading by parapet can be negligible) with the height of 1.2 m is located south of a flat-plate collector which is installed on the roof of the same building at the latitude of 23 N. The collector with the size of 2 m in length and 1.2 m in width face south with the tilt angle of 30°. (a) What is the minimum distance required from the front of the collector to the parapet to avoid shading on the collector, which is caused from the parapet, at the solar noon of the spring equinox of an ordinary (i.e., non-leap) year? (b) With the distance determined in Part (a), will the shading problem on the collector, caused from the parapet, be occurred at 2 hours after the solar noon on the summer solstice? Show your answer with the calculated result. If yes, what is the shaded area on the collector at that moment?
A “long" parapet (that is, the end effect of shading by parapet can be negligible) with the height of 1.2 m is located south of a flat-plate collector which is installed on the roof of the same building at the latitude of 23 N. The collector with the size of 2 m in length and 1.2 m in width face south with the tilt angle of 30°. (a) What is the minimum distance required from the front of the collector to the parapet to avoid shading on the collector, which is caused from the parapet, at the solar noon of the spring equinox of an ordinary (i.e., non-leap) year? (b) With the distance determined in Part (a), will the shading problem on the collector, caused from the parapet, be occurred at 2 hours after the solar noon on the summer solstice? Show your answer with the calculated result. If yes, what is the shaded area on the collector at that moment?
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