The maximum variation in estimated values of UL is 11% and the collector heat efficiency factor has a maximum variation of 1.24% to 2.52%. The lowest optimum tilt angle was estimated for June (5.26°), and the highest one was estimated for December (51.95°) with an overall optimum tilt angle of 31.1° for a year. Solar radiation falling on the tilted surface was noted throughout the year and based on the availability of the solar radiation an optimum tilt angle was estimated by using the empirical relation for every month of a year. ![]() The present study concerns with the thermal analysis of a flat-plate collector covered with a single glass having a tilted surface facing south, located in Delhi (28☆4'N, 77☁2'E), India, under different operating and climate conditions.
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