... be absorbed. Therefore, for angles somewhat larger than ω crit , the receiver position and size can be fixed at that corresponding to ω crit , with the rays being absorbed after two reflections. This two-reflection condition prevails up until ω max,2-ref , beyond which the twice-reflected right edge ray...

... models such as the drying chamber or solar air heater (absorber) [ 25 , 40 , 45 ]. Some studies on numerical simulation of solar drying processes with thermal storage materials have been presented [ 6 , 20 , 21 , 45 ]. However, no study seems to have been documented on CFD-based numerical simulation...

... performance of the CPC–CPVT system is the non-uniform heat flux distribution on the absorber surface. In the present paper, detailed ray-tracing simulations have been carried out to understand the heat flux distribution characteristics of CPC with different geometrical conditions, and those are concentration...

...@unm.edu Contributed by the Solar Energy Division of ASME for publication in the J ournal of S olar E nergy E ngineering : I ncluding W ind E nergy and B uilding E nergy C onservation . 30 01 2022 09 09 2022 09 09 2022 27 01 2023 absorber efficiency energy...

...Faisal Altwijri; S. A. Sherif; Ahmed M. Alshwairekh This paper reports on a parametric investigation of the thermal enhancement of a double-reflector parabolic trough collector when employing an in-line mixed V-shape (IMVS) ribbed absorber tube. Three heat transfer fluids (HTFs) are investigated...

...Dheeraj Kumar; Apurba Layek An effort is made to study the performance of a solar air heater having the absorber surface roughened by providing staggered, twisted, and V-shaped ribs roughness. The liquid crystal thermography technique is applied to get the Nu distribution over the surface...

... losses [ 1 , 2 ]. Based on the material used, ETCs are classified into two types, namely, ETC with heat pipe termed as “tube-in-tube type ETC” and ETC without heat pipe termed as “water-in-tube type ETC” (WTTETCs). In heat pipe type ETC, copper tube is inserted inside the tube to absorb solar radiation...

... is kept constant. The channel design that gives the best performance was further investigated by incorporating a sinusoidal wavy absorber having variable wavy roughness parameters. The flow and heat transfer characteristics have been evaluated in terms of friction factor (f) and Nusselt number per unit...

... with little spillage at all sun elevations. With an area of 10–20 times larger than the cavity entrance, the absorber functions at peak temperatures that are within range of standard stainless steel tubing, despite using a gaseous HTF. Reflectors of PWF collectors have significantly better cosine factors than...

... the dehumidification effectiveness of plastic and metallic surfaces of adiabatic/nonadiabatic falling film tower by incorporating the wetting factor and sensible cooling information in the correlation equation. The new approach takes into account the sensible cooling (nonadiabatic absorber) of the desiccant solution...

...Hamed Abedini; Nesrin Ozalp Carbon particles can be used as catalyst in solar reactors where they serve as radiant absorbent and nucleation sites for the heterogeneous decomposition reaction. Unlike commonly used metal catalysts, carbon catalyst does not have durability problem and high cost...

... (prepared by dispersing functionalized carbon soot nanoparticles extracted from used engine oil into paraffin oil) having high solar weighted absorptivity has been employed to volumetrically absorb the incident solar energy. This additional absorbed solar energy is provided to the solar still by circulating...

... of the glass and water are determined by (7) C g = ρ g L g A g c g , C w = ρ w V w c w The heat fluxes absorbed by the glass tube q g and by the evaporator of the HP q e are given by [ 21 , 23 ] (8) q g ( t ) = ρ m α g γ k a m...

... influx absorbed by the absorber plate. The iron content of glass and its thickness play a significant role in enhancing thermal and optical efficiencies. The low-iron glass (LiG-12 mm) has 16.3% and 20% greater thermal efficiency than medium- (MiG-12 mm) and high-iron glass (HiG-12 mm), respectively...

... data for this study are included in the paper. Data provided by a third party listed in Acknowledgment. National Institute for Space Research. α = absorbance of the material ɛ = emissivity of the body κ = thermal conductivity of the material (W/(m K)) k r...

... of the stretching band ZnO, namely, the wave number, A ( ν ) is the absorbance and d the film thickness, respectively. The experimental spectra were fitted using a Lorentzian component (Fig. 2 ). A(υ) is given by (2) A ( υ ) = L ( x ) = a ⋅ c ( x − b ) 2 + c 2 where...

...Roger Cundapí; Sara L. Moya; Octavio Cazarez Temperature fields and their transient behaviors are essential subjects to be considered for modeling and design of absorber tubes in concentrated solar power plants. Both subjects have been addressed by various authors. However, the first subject has...

... curve coefficients, i.e., a o , a 1 , and a 2 , are shown in Table 2 as provided by the manufacturer. The collector can be assumed to be in a thermal steady-state. Then, the single-phase heat transfer rate absorbed by water is (2) Q ˙ s p = η s p ⋅ I sol ⋅ A c...

... absorber clean energy collector efficiency measurement solar testing Because of the increasing greenhouse gases, environmental pollutants, and the rapid depletion of conventional energy sources, the search for alternative energy sources has been necessitated to meet the present and future...

... model ray-tracing absorber optics simulation solar receiver As one of the potential solutions to the energy crisis and global warming, solar energy has been used to replace fossil fuels in various thermal systems. The critical device in solar thermal systems is the solar collector...