TY - JOUR ID - 134895 TI - Effect of Covering Aperture of Conical Cavity Receiver on Thermal Performance of Parabolic Dish Collector: Experimental and Numerical Investigations JO - Journal of Renewable Energy and Environment JA - JREE LA - en SN - 2423-5547 AU - Eterafi, Sina AU - Gorjian, Shiva AU - Amidpour, Majid AD - Department of Biosystems Engineering, Factuly of Agriculture, Tarbiat Modares University (TMU), P. O. Box: 14115-111, Tehran, Tehran, Iran. AD - Department of Energy System Engineering, Factuly of Mechanical Engineering, K. N. Toosi University of Technology, P. O. Box: 19395-1999, Tehran, Tehran, Iran. Y1 - 2021 PY - 2021 VL - 8 IS - 4 SP - 29 EP - 41 KW - Experimental analysis KW - Conical cavity receiver KW - Ultra-white glass cover KW - Parabolic dish concentrator DO - 10.30501/jree.2021.275871.1194 N2 - In this study, the effect of covering the aperture area of a conical cavity receiver with an ultra-white glass on operational parameters of a Parabolic Dish Collector (PDC) was numerically and experimentally investigated under climate conditions of Tehran (35.44° N latitude and 51.10° longitude). The main components of the experimental setup include a dish reflector, a conical cavity receiver, Heat Transfer Fluid (HTF), hydraulic and cooling cycle, and a sun tracker. For this purpose, a conical cavity receiver with an ultra-white glass cover on its aperture was numerically modeled in Fortran software. During the evaluation, environmental parameters including ambient temperature, solar radiation, and wind speed were considered as inputs of the model. The results revealed fair agreement between the numerical and experimental data with the maximum error of approximately 4.63 % and 7.89 % for receivers with and without the glass cover on the aperture, respectively. For a steady-state analysis, the mean values of useful energy ( ) absorbed by the receiver were calculated as 1,253.25 W and 987.68 W, while thermal efficiency ( ) of the receiver was calculated as 52.61 % and    40.69 % for receivers with and without glass cover, respectively. The results revealed that both  and  followed a similar trend of the variations in the HTF’s temperature between the inlet and outlet of the receiver. Also, the overall heat loss coefficient ( ) and the collector heat removal factor ( ) were calculated as 420.76 W/m2°C and 0.62 for the conical cavity receiver with the glass cover. UR - https://www.jree.ir/article_134895.html L1 - https://www.jree.ir/article_134895_4953c76f38f11a7c482f5dfdf6548e5b.pdf ER -