Abstract
ABSTRACT In this study, the thermal performance of a microparticle-enhanced form-stable phase change material (PCM) integrated heat pipe evacuated tube solar collector (ETSC) system is evaluated through outdoor experimentation. The study examines the thermal performance of PCM-enhanced ETSC using acetamide with varying percentages of expanded graphite (EG) at 10, 15, and 20 wt% and aluminum microparticles at 1, 2, and 5 wt%, focusing on the use of EG at different concentrations and microparticles. The microparticle-enhanced form-stable PCM is integrated into the tube only. The system was tested under open environmental conditions, comparing outcomes with a normal ETSC system, considering water outlet temperature, charging-discharging behaviors, collector efficiency, and energy analysis. The study revealed that the micro-particle enhanced PCM integrated heat pipe ETSC system significantly improved thermal performance, energy storage and release capabilities, and efficiency in generating heat at lower solar irradiance, compared to conventional ETC systems. The maximum collector efficiency of 47.4% is achieved when utilizing acetamide with 10% EG and 2% Al, which is 10.9% more than conventional ETSC. The study explores the use of lanthanum oxide/water nanofluid in solar collectors, revealing that increasing nanoparticle concentrations enhances water outlet temperature, heat gain, and solar thermal collector efficiency up to 64.14%.
Published Version
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