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Ä Ö Ü ä ö ü ß
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      저자 : Sachit Vardhan (검색결과 2 건)
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        Energy, exergy, environmental and economic (4E) analysis of evacuated tube solar collector with helical coils

        Inderjeet Singh,Sachit Vardhan 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.11

        In this article, the comprehensive analysis on the energy, exergy, environmental and economic aspects of the modified evacuated solar collector having helical coils (mETC) and unmodified evacuated solar collector has been presented. For the helical coiled solar collector, the daily variation of energy and exergy efficiency and the variation with mass flow rate has been contrasted to conventional evacuated collector under similar conditions. Furthermore, the life cycle cost analysis for mETC has been presented for economic analysis. For the environmental analysis, the energy and fuel savings achieved by the modified mETC solar air heater have been compared with other sources for predicting fuel savings, cost saving and reduction in CO 2 emissions. It was comprehended that the energy and exergy efficiency for mETC is significantly improved over simple ETC solar air heater. Highest exergy efficiency of 5.61 % has been achieved by mETC whereas for simple ETC, the maximum exergy efficiency was obtained as 2.5 %. The average daily and yearly savings in electricity cost was obtained as Rs. 34.21 (0.44 USD) and Rs. 10262 (131.14 USD), respectively, for mETC solar air heater.

      • KCI등재

        Heat transfer and fluid flow characteristics of solar air heater duct with non-uniform ribs

        Inderjeet Singh,Sukhmeet Singh,Sachit Vardhan 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.1

        This article presents a solar air heater channel artificially made rough with a transverse roughness in square-wave shape, investigated for the enhancement in heat transfer and fluid flow characteristics. Non-uniform profile of the ribs has been used by providing periodic gaps for reduction in eddies behind the rib. The research incorporates relative roughness width from 10-310, relative roughness pitch = 10, relative roughness height = 0.043, and Reynolds number from 3000-15000, respectively. The procedure followed for the CFD investigation has been confirmed with the experimental results. The maximum increment in Nusselt number was 2.22, and the consequent value for the friction factor increment of 3.44 was obtained. The highest THPP value of 1.49 was obtained while maximum thermal efficiency of 68.6 % was achieved. The non-uniform ribs were found better as compared to uniform ribs. The results have been demonstrated using graphical contours and streamlines.

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