THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

online first only

Enhancement and experimental study on thermal behaviour of heat pipe based solar absorber by using copper oxide nanofluid

ABSTRACT
Technological growth in thermal science found that the awareness of solar thermal energy improved widely in various applications and spotted issues on conventional flat plate solar collectors operating with water fluid: lower thermal efficiency, limited thermal performance during low sunlight, and unavoidable heat loss for extended plate surface. This research attempts to enhance the thermal performance of solar collectors modified with heat pipe solar absorber (HPSA) evaluated by 0.010, 0.015, and 0.02volume fractions of copper oxide (CuO) nanofluid at 18l/min. The effect of CuO on varied flow rate on temperature gain, heat transfer coefficient, and thermal efficiency of HPSA is experimentally studied, and its findings are compared with water fluid. The HPSA operates with 0.015vol CuO nanofluid with a higher rate of flow, proving better thermal performance and offering a maximum temperature gain of 68ÂșC with a better heat transfer coefficient of 81.5W/m2K results enhanced thermal efficiency of 85.2%, which are higher than the water fluid operated HPSA system. An optimum operating parameter of HPSA is suggested for heat exchanger applications.
KEYWORDS
PAPER SUBMITTED: 2023-03-11
PAPER REVISED: 2023-08-26
PAPER ACCEPTED: 2023-10-05
PUBLISHED ONLINE: 2024-01-20
DOI REFERENCE: https://doi.org/10.2298/TSCI230311274T
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