@article{aa00562b08c544d4823d357adc8ec1bf,
title = "Thermal analysis of a finned receiver for a central tower solar system",
abstract = "In this study, a thermal analysis of a finned receiver prototype for a thermosolar tower system is presented. The experimental system consists of parallelepiped aluminum enclosure of 1.2 m high, 1.23 m wide and 0.1 m depth. At the interior, 1232 cylindrical fins with a diameter of 0.0095 m (3/8″) and 0.09 m length increases the heat transfer area up to 225%. The vertical wall receives the incoming solar concentrated radiation from a group of heliostats whilst at the interior a constant flow of water removes the absorbed energy. Experimental temperature profiles were obtained at different heights and depths and a comparison was made with numerical results obtained with the use of commercial CFD software. It was found that the maximum thermal efficiency of the receiver was 94.4%, decreasing as the radiative flux increases.",
keywords = "Concentrated radiation, Heat transfer, Solar tower system, Thermal receiver",
author = "A. Pi{\~n}a-Ortiz and Hinojosa, {J. F.} and P{\'e}rez-Enciso, {R. A.} and Maytorena, {V. M.} and Calleja, {R. A.} and Estrada, {C. A.}",
note = "Funding Information: This work has been partially funded by CONACYT (Grant 123767 ). A. Pi{\~n}a-Ortiz and R.A. P{\'e}rez-Enciso would like to gratefully acknowledge CONACYT the support granted through its program for Institutional consolidation which permits the retention of recent researchers. A Receiver width, (m) Ar Inner hot surface area, (m2) Cp Specific heat at constant pressure, (J/kg K) D Inlet pipe diameter, (m) g Gravitational acceleration, (m/s2) Gk Generation of turbulent kinetic energy due to the buoyant force, (J/kg) Gr Grashof number, nondimensional H Receiver height, (m) h Average convective heat transfer coefficient, (W/m2 K) k Turbulent kinetic energy, (m2/s2) L Receiver length, (m) m ˙ Mass flow, (kg/s) Nu Average Nusselt number of the heated wall, nondimensional qcal Calorimetric heat flux, (W/m2) qHFS Radiative heat flux, (W/m2) Pk Generation of turbulent kinetic energy, (J/kg) Ra Modified Rayleigh number at the heated wall, nondimensional Re Reynolds number at the inlets, nondimensional T amb Ambient temperature, (K) T h ¯ Average temperature of the hot wall, (K) T i ¯ Average temperature of the inlets, (K) T ∞ Temperature of the bulk fluid, (K) U Inlet velocity, (m/s) x, y, z Coordinate system, (m) i, j, k Unity vector components Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd",
year = "2019",
month = feb,
day = "1",
doi = "10.1016/j.renene.2018.07.123",
language = "American English",
volume = "131",
pages = "1002--1012",
journal = "Renewable Energy",
issn = "0960-1481",
publisher = "Elsevier BV",
}