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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Author(s)
Jafar Madadnia
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DOI:10.17265/1934-8975/2015.11.006
Affiliation(s)
Faculty of Engineering and IT, UTS (University of Technology Sydney), Broadway, NSW 2007, Australia
ABSTRACT
In the absence of a simple technique to predict
convection heat transfer on BIPV (building integrated photovoltaic) surfaces, a mobile probe with two
thermocouples was designed. Thermal boundary layers on vertical flat surfaces of a PV (photovoltaic) and a metallic plate
were traversed. The plate consisted of twelve heaters where heat flux and
surface temperature were controlled and measured. Uniform heat flux condition
was developed on the heaters to closely simulate non-uniform temperature
distribution on vertical PV modules. The
two thermocouples on the probe measured local air temperature and contact
temperature with the wall surface. Experimental results were presented
in the forms of local Nusselt numbers versus Rayleigh numbers “Nu = a·(Ra)b”,
and surface temperature versus dimensionless height (Ts – T∞ = c·(z/h)d). The constant values
for “a”, “b”, “c” and “d”
were determined from the best curve-fitting to the
power-law relation. The convection heat transfer predictions from the empirical
correlations were found to be in consistent with those predictions made by a
number of correlations published in the open literature. A simple technique is
then proposed to employ two experimental data from the probe to refine empirical
correlations as the operational conditions change. A flexible technique to
update correlations is of prime significance requirement in thermal design and
operation of BIPV modules. The work is in
progress to further extend the correlation to predict the combined radiation
and convection on inclined PVs and channels.
KEYWORDS
Natural convection heat transfer, PV, BIPV, experimental method, empirical correlations.
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