الفهرس 
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Abstract
The present work introduced the results of an experimental study carried
out to predict the thermal performance of phase change material (PCM)
based cylindrical fins heat sink for a heat aluminum plate simulating PV
solar cell. The used PCMs are RT28HC and RT35HC which have a
melting point near to the PV solar cell reference temperature. The
experiments were conducted to simulate three different values of heat
flux around year at 820W/m2, 514W/m2 and 279W/m2. Cylindrical fins
acts as the thermal conductivity enhancer (TCE) to improve the
distribution of heat more uniformly as the thermal conductivity of the
PCM is very low. The percentage of the cylindrical fins root area ratio AR
is varied from 1.29 to 2.57%. The corresponding percentage enclosed
area ratio is 3.57 to 7.14%. Using RT28HC and RT35HC with cylindrical
fins as TCE is a promising solution at highest heat fluxes 820W/m2 where
a percentage temperature DROP of 40-47% in the frontal surface
temperature is obtained when compared with bare free surface. Lowering
the obtained maximum temperature in charging mode not only enhances
the electric conversion efficiency but also increases the PV plate duty life
as a result of decreasing the temperature variation in charging and
discharging modes.