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Glass Cover Temperature and Upward Heat Losses of a Single Glazed Collector With Nearly Vertical Configuration

[+] Author Affiliations
Suresh Kumar, Subhash C. Mullick

Indian Institute of Technology Delhi, New Delhi, India

Paper No. IMECE2010-38028, pp. 1065-1070; 6 pages
doi:10.1115/IMECE2010-38028
From:
  • ASME 2010 International Mechanical Engineering Congress and Exposition
  • Volume 5: Energy Systems Analysis, Thermodynamics and Sustainability; NanoEngineering for Energy; Engineering to Address Climate Change, Parts A and B
  • Vancouver, British Columbia, Canada, November 12–18, 2010
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4429-8
  • Copyright © 2010 by ASME

abstract

Estimation of upward heat losses is required for design or thermal performance evaluation of a flat plate collector. Collectors with vertical configuration are used at high latitudes and are integrated with building walls. Values of glass cover temperature are required for calculation of upward heat losses under different operating conditions. Glass cover temperature can be determined from numerical solution of heat balance equations. In the present work an empirical relation for glass cover temperature of a single glazed flat plate collector for angle of tilt 60 to 90 degree is proposed. Values of glass cover temperature obtained from this empirical relation have been used for computation of top heat loss coefficient of flat plate collector. Analytical equation has been employed for estimation of Ut . The range of variables covered in the present analysis is 20 °C to 150 °C for absorber plate temperature, 0.1 to 0.95 for absorber coating emittance, 20 mm to 50 mm for air gap spacing, 60 deg to 90 deg for collector tilt, 5 W/m2 K to 30 W/m2 K for wind heat transfer coefficient and −10 °C to + 40 °C for ambient temperature. The maximum absolute error in values of Ut is within two percent in comparison to values obtained by numerical solution of heat balance equations over the entire range of variables covered in the present work.

Copyright © 2010 by ASME

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