Improvement of Heat Pipe Solar Collector Thermal Efficiency Using Al2O3/Water and TiO2/Water Nanofluids

Heat pipe solar collectors (HPSCs) are heat exchangers that carry based on the phase change of working fluid. It is aimed to increase operating temperature range by changing fluid in at low temperature. For this reason, it has become widespread use nanofluids obtained mixing nanosized metal oxides with base certain proportions order both thermal conductivity fluids and specific closures. The main purpose study, which was conducted evaluate performance HPSCs, performance, an experimental study been direction. purpose, HPSC designed manufactured used. Al2O3-water TiO2-water containing 2% nanoparticles were used study. consists 8 pipes a length 100 cm. experiments carried out for pure water nanofluids, their efficiency strength compared. highest value instantaneous calculated as 48% when fluid, 58% nanofluid, 64% nanofluid. power using determined 135.66 W, 167.96 W 184.03 improvement 20.8% nanofluid 33.3% Improvement powers found be 23.8% 35.6%