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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Journal of Enhanced Heat Transfer
Импакт фактор: 1.406 5-летний Импакт фактор: 1.075 SJR: 0.287 SNIP: 0.653 CiteScore™: 1.2

ISSN Печать: 1065-5131
ISSN Онлайн: 1026-5511

Выпуски:
Том 27, 2020 Том 26, 2019 Том 25, 2018 Том 24, 2017 Том 23, 2016 Том 22, 2015 Том 21, 2014 Том 20, 2013 Том 19, 2012 Том 18, 2011 Том 17, 2010 Том 16, 2009 Том 15, 2008 Том 14, 2007 Том 13, 2006 Том 12, 2005 Том 11, 2004 Том 10, 2003 Том 9, 2002 Том 8, 2001 Том 7, 2000 Том 6, 1999 Том 5, 1998 Том 4, 1997 Том 3, 1996 Том 2, 1995 Том 1, 1994

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.2017014426
pages 527-539

OVERALL HEAT LOSS FROM BOTH SIDES OF A TILTED UNGLAZED SOLAR COLLECTOR UNDER INDOOR CONDITIONS USING FLOW CALORIMETRY AND THERMOGRAPHY

O. Montoya-Marquez
Centro Nacional de Investigacion y Desarrollo Tecnologico-TecNM-SEP, Interior Internado Palmira s/n, Cuernavaca, Morelos, México, C.P. 62490
J. J. Flores-Prieto
Centro Nacional de Investigacion y Desarrollo Tecnologico-TecNM-SEP, Interior Internado Palmira s/n, Cuernavaca, Morelos, México, C.P. 62490

Краткое описание

An experimental investigation of the overall heat loss on a flat plate absorber solar collector in the natural convection regimen from both sides of the plate is presented in terms of the heat transfer coefficient, UL. The study considers variations of the inclination angle with respect to the horizontal axis and the input-ambient temperature difference. The experiments were based on the steady-state energy balance under controlled indoor conditions, using heat flow calorimetry and infrared imaging. The UL value was determined in the range of 0°–90° for the tilt angle and 3.3–34.1°C for the input-ambient temperature difference. It can be seen that the UL value changes by 9.7% due to the plate tilt angles and 16.8% due to the input-ambient temperature difference over the working range. The maximum UL value was found at a 45° flat plate tilt angle, slightly decreasing as it changes its position vertically or horizontally. The UL value varies nearly linearly with the input-ambient temperature difference, with a slope of 0.035 W/m2K/K. The two-variables correlation was obtained of the UL value, which agrees well with a root-mean-square error of 0.12 W/m2K (R2 = 0.97). Therefore, with a non-considerable wind effect on unglazed solar collectors, the UL value is affected as the tilt angle and input-ambient temperature difference change with regard to the characterization parameters.


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