New insights for phase-change immersion cooling enhancement of solar cells under high concentration ratios

Abstract

Summary To answer how surface corrosion affects the heat transfer performance of phase‐change immersion cooling solar cells, electrochemical etching was used for substrate surface treatment of simulated dense‐array solar cells in this paper. Morphology, roughness, and wettability of treated surfaces were characterized by scanning electron microscope, atomic force microscope, and spreading area, respectively. A self‐running cooling system was developed to investigate the effect of surface treatment on self‐running characteristics and heat transfer performance under different ethanol inlet temperatures and concentration ratios. The results show that the surface treated for 2 hours owns higher wettability because of the honeycomb‐like porous structure. Lower ethanol flowing velocity obtained under lower ethanol inlet temperature with treated samples. The maximum declined degree in the wall superheating of 21.1% and the maximum enhancement in the heat transfer coefficient of 33.3% are obtained for sample treated for 2 hours because of its higher wettability and porosity structure. The results show that electrochemical etching on substrate surface can improve the phase‐change immersion cooling performance of solar cells.

Surface modification of carbon nanotubes with copper oxide nanoparticles for heat transfer enhancement of nanofluids

“…54,55 To overcome this challenge and get a homogenous solution of nanouid, different strategies have been implemented such as chemical, physical and mechanical methods. [56][57][58][59][60][61] In our previous study, 50 the enhancement of both specic heat capacity and thermal conductivity of nanouids free of surfactants using carbon nanotubes chemically functionalized with polyethylene glycol has been investigated. As a continuation of our previous work, this study mainly focused on the thermophysical properties of nanouids with impregnated copper oxide on the surface of CNTs (CNT-CuO/water nanouids).…”

Comparative study of high concentrating photovoltaics integrated with phase-change liquid film cooling system

“…Error rate of α t is 1.24% due to the temperature ranged from 110°C to 130°C. The relation between concentration ratio and input power can be calculated by the following equation, where U in , I in , and A represent input voltage, input current, and effective heating area, respectively. θ s is standard solar mediation intensity, which equals to 1000 W/m 2 .…”