Abstract
This paper reports some results of an experimental investigation on performance of four different types of collectors. These include the flat plate collector and the parabolic cylindrical, compound parabolic and conical concentrators. The flat plate collector with two glass covers was found to be best suited for use in Delhi, provided the required maximum temperature did not exceed 95° C. Among the concentrating collectors tested, the conical collector with conical absorber, gave significantly higher temperatures for the same concentration ratio. The conical reflector is also easier to fabricate as compared to parabolic reflectors. The requirement of high reflectivity and its continued maintenance for a concentrator, is a major drawback of a concentrating collector.
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