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Proceedings Paper

Analysis By Real-Time Holographic Interferometry Of Heat Transfer At The Surface Of Cold Solar Collectors
Author(s): J. Guerry; J. P. Hot; C. Durou
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Paper Abstract

As part of a general study of heat exchange at the surface of solar energy collectors, we have assembled a real-time holographic interferometry apparatus with wide field. The interferograms are either recorded by photographic means and analysed manually, or else they are collected by a TV camera and treated immediately by a special system linked to a computer. Experiments using collectors heated to 40°C or cooled to 10°C, both in the vertical and inclined position have allowed the presence of a zone of laminar flow where the convection transfer coefficient decreases from about 5 to 3.5 WK-lm-2, followed by a zone of turbulent flow in which this coefficient remains constant at a value of 3 WK-lm-2. For tilted plates, the convection transfer coefficients are different for the two faces. There is some scatter in the measurements which is due to the nature of the natural convective phenomenon itself.

Paper Details

Date Published: 20 May 1980
PDF: 10 pages
Proc. SPIE 0210, 2nd European Congress on Optics Applied to Metrology, (20 May 1980); doi: 10.1117/12.958334
Show Author Affiliations
J. Guerry, Universite Paul Sabatier (France)
J. P. Hot, Universite Paul Sabatier (France)
C. Durou, Universite Paul Sabatier (France)

Published in SPIE Proceedings Vol. 0210:
2nd European Congress on Optics Applied to Metrology
Michel H. Grosmann; Patrick Meyrueis, Editor(s)

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