The effect of condenser heat transfer on the energy performance of a plate heat pipe solar collector

Abstract

SUMMARYFor a novel prototype solar collector, using a plate heat pipe, condenser heat transfer was analysed in detail. The condenser has the shape of a rectangular channel. Flow and heat transfer of water in the rectangular channel was modelled and the heat transfer coefficient assessed, using the Fluent code. Under typical operating conditions a mixed convection situation occurs. The channel is inclined and heating is through one wall only (upper channel surface). The range of temperature differences considered was similar to the one verified under real operating conditions, covering a wide range of Grashof numbers. Results showed that the Nusselt number is significantly higher than the one for forced convection in a rectangular channel with fully developed boundary layers. In order to enhance heat transfer, a modification to the rectangular channel was analysed, using baffles to improve flow distribution and increase velocity. The effect of this modification on collector energy performance (efficiency) was assessed.

Theoretical investigation on thermal performance of heat pipe flat plate solar collector with cross flow heat exchanger

“…Results showed that the Nusselt number is significantly higher than the one for forced convection in a rectangular channel with fully developed boundary layers. In order to enhance heat transfer, a modification to the rectangular channel was analyzed, using baffles to improve flow distribution and increase velocity [18]. Azad [19] investigated theoretically and experimentally the thermal behavior of a gravity assisted heat pipe solar collector.…”