20 May 1980 Analysis By Real-Time Holographic Interferometry Of Heat Transfer At The Surface Of Cold Solar Collectors
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Proceedings Volume 0210, 2nd European Congress on Optics Applied to Metrology; (1980) https://doi.org/10.1117/12.958334
Event: Optics, Photonics, and Iconics Engineering Meeting, 1979, Strasbourg, France
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.
© (1980) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
J. Guerry, J. Guerry, J. P. Hot, J. P. Hot, C. Durou, C. Durou, } "Analysis By Real-Time Holographic Interferometry Of Heat Transfer At The Surface Of Cold Solar Collectors", Proc. SPIE 0210, 2nd European Congress on Optics Applied to Metrology, (20 May 1980); doi: 10.1117/12.958334; https://doi.org/10.1117/12.958334
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