Inscrição na biblioteca: Guest
Portal Digital Begell Biblioteca digital da Begell eBooks Diários Referências e Anais Coleções de pesquisa
Journal of Enhanced Heat Transfer
Fator do impacto: 0.562 FI de cinco anos: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN Imprimir: 1065-5131
ISSN On-line: 1026-5511

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

RESUMO

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.


Articles with similar content:

CFD ANALYSIS OF HEAT TRANSFER CHARACTERISTICS OF SOLAR COLLECTOR IN REAL SURROUNDING WIND FACTORS
Proceedings of the 24th National and 2nd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2017), Vol.0, 2017, issue
Om Prakash Singh, Ajeet Pratap Singh
Analytical and Numerical Investigations of Physical Dimensions of Natural Convection Flow on a Vertical Heated Plate
International Journal of Fluid Mechanics Research, Vol.41, 2014, issue 4
Ali S. Alzwayi , Manosh C. Paul
GRAETZ PROBLEM WITH MAXIMUM DENSITY EFFECTS IN CONVECTIVELY COOLED HORIZONTAL WATER PIPES - HEAT TRANSFER CHARACTERISTICS PRECEDING THE ONSET OF ICE FORMATION
International Heat Transfer Conference 9, Vol.3, 1990, issue
K. C. Cheng, Jenn-Wuu Ou
SIMULATION OF WETTABILITY EFFECTS ON GAS-WATER FLOW IN POROUS MEDIA
International Heat Transfer Conference 16, Vol.5, 2018, issue
Bohao Wu, Yu Liu, Yongchen Song, Dayong Wang, Meiheriayi Mutailipu
HEAT TRANSFER ENHANCEMENT, THERMODYNAMIC AND NUMERICAL OPTIMISATION OF COMPLEX SOLAR ENERGY SYSTEMS-PARABOLIC TROUGH COLLECTOR SYSTEMS
International Heat Transfer Conference 16, Vol.2, 2018, issue
Josua Petrus Meyer, Aggrey Mwesigye, Tunde Bello-Ochende