Thermal performance analysis of a solar energy storage unit encapsulated with HITEC salt/copper foam/nanoparticles composite

Abstract

Thermal performance analysis of a solar energy storage unit encapsulated with HITEC salt/copper foam/nanoparticles composite. Energy, 192. 116593.

Efficient Stabilization of Mono and Hybrid Nanofluids

“…Usually these explosions need to be repeated 10 times. [67,68] mechano-chemical [69] thermo-chemical [28,70] chemical route synthesis [37] Combined method Figure 6. Block diagram of a two-step nanofluid preparation method [52,65].…”

“…Usually these explosions need to be repeated 10 times. [67,68] mechano-chemical [69] thermo-chemical [28,70] chemical route synthesis [37] Combined method Another example, this time regarding preparation of hybrid nanofluid, is a reported chemical-mechanical method for the synthesis of nanoparticles Cu+Al 2 O 3 [69]. A chemical-thermal technique was employed to obtain a nanocrystalline hybrid powder, consisting of the following stages: spray-drying, oxidation, reduction in a hydrogen atmosphere and homogenization [75].…”

“…• conventional models specified for mono nanofluids do not apply in the case of hybrid nanofluids; what's more there are no unequivocal experimental results or agreement regarding available models and characteristics among researchers involved in this subject, • the relative viscosity and density of a hybrid nanofluid is directly proportional to the concentration of nanoparticles and inversely proportional to the temperature, • thermal conductivity and heat capacity increase with temperature, • with rising temperature and concentration of nanoparticles, the thermal properties improve until the critical point is reached-a visible deterioration of nanofluid thermal properties is observed beyond this point, • the thermal conductivity ratio, viscosity, density, heat capacity, pressure drop and friction factor of a hybrid nanofluid are slightly higher than for the base fluid and mono nanofluid, and they grow directly proportionally to the concentration of nanoparticles, • dispersion of nanoparticles in the base fluid is a problem frequently during stabilisation, and suspension stability time is relatively short (up to 60 days [35]), • Brownian motion of nanoparticles and micro-convection effect, clustering and pH values strongly affect the thermal parameters of hybrid nanofluids (which is very rarely discussed in the literature) [36], • coagulation and clustering of multi-sized nanocomposites in a nanofluid strongly affect its thermal properties [37,38], • there are quite a few valuable papers examining from a statistical point of view of mono and hybrid nanofluid preparation, stabilization and evaporation in specific systems [39,40].…”

Preparation and Characterization of Paraffin/Mesoporous Silica Shape-Stabilized Phase Change Materials for Building Thermal Insulation

“…Thus, various environment-friendly technologies have been proposed to enhance building energy efficiency and reduce carbon dioxide emissions [ 5 , 6 ]. Among various technologies, the use of phase change materials (PCMs) has gained more and more attention, as they have high energy storage density and can be operated within a small temperature range during the phase change conversion process [ 7 , 8 , 9 ]. However, PCMs are prone to leakage after melting when they are directly incorporated into building structures, which limits their wide application in building energy conservation [ 10 , 11 ].…”

Magnetically-accelerated photo-thermal conversion and energy storage based on bionic porous nanoparticles

“…The world's energy consumption has increased, due to the drastic development of human society which has caused global warming and environmental pollution [1,2]. As an excellent renewable energy source which can substitute fossil fuels, solar energy has successfully gained attention due to its environmental friendliness and lower cost [3][4][5][6].…”