Theoretical Investigation on Heat Transfer and Friction Factor Characteristics of Cylindrical Parabolic Concentrating Collector with Twisted Tapes
نویسندگان
چکیده
The present work deals with the theoretical study on heat transfer characteristics and the performance of a cylindrical parabolic solar water heater with twisted tape inserted inside the absorber tube. The absorber tube equipped with twisted tape with six different twist ratios 5, 6, 7, 8, 9 and 10. The theoretical work is conducted in a turbulent flow regime and considering water as a working fluid flowed through the absorber tube, the Reynolds number varied from 5410 to 31033 within the range of study. The theoretical results showed that Nusselt number and friction factor increase with smaller twist ratio for a given mass flow rate. Over the range investigated, beam radiation, useful heat gain and efficiency were found high at noon and reach maximum in winter Season.
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