Developments of CPC solar evacuated glass tube collector with a …
Microstructure and optical properties of Co-WC-Al2O3 duplex ceramic metal-dielectric solar selective absorbing coating prepared by high velocity oxy-fuel spraying and sol-gel method. Vacuum (2017) ... Solar collector is the core equipment of solar solar thermal utilization system, but its efficiency of solar thermal conversion is low, and it ...
Ultra-wide broadband dielectric mirrors for solar collector ...
Request PDF | On Feb 24, 2017, Markus Fredell and others published Ultra-wide broadband dielectric mirrors for solar collector applications | Find, read and cite all the research you need on ...
Entropy and exergy analyses of a direct absorption solar collector…
Real component of the dielectric constant of the nanoparticle. ... [20] conducted energy and entropy analyses of a similar solar collector in which Fe 2 O 4 and SiO 2 were used together as the working fluid. The radiation properties of these nanofluids were measured as about 10 cm −1 higher than for the base fluid. The results showed that the ...
New CPC Solar Collector for Planar Absorbers Immersed in …
Design of Optimal and Ideal 2-D Concentrators With the Collector Immersed in a Dielectric Tube
Dielectric compound parabolic concentrating solar collector with a ...
Coupling a dielectric compound parabolic concentrator (DCPC) to an absorber across a vacuum gap by means of frustrated total internal reflection (FTIR) can theoretically approach the …
A review of material and coatings in solar collectors
Receiver of the solar collector should have the high specular absorbtance. To improve the absorbtance solar selective coatings have been used by the researchers. ... Solar selective coatings are classified into: intrinsic; semiconductor-metal; multi-layer; cermets or metal-dielectric composite materials; and finally textured surfaces [7].
Types of solar selective coatings; (i) …
Download scientific diagram | Types of solar selective coatings; (i) Intrinsic absorber, (ii) Semiconductor metal tandem absorber, (iii) Cermet absorber (iv) Textured absorber (v) Dielectric …
Ultra-wide broadband dielectric mirrors for solar collector …
Solar collector mirrors must provide high reflection across this spectral band without degrading over time. This work presents the results of a high-performance 200 mm parabolic mirror coated with an ultra-wide broadband dielectric reflector. The mirror was developed to demonstrate high efficiency broadband solar collection and power conversion.
Chapter 3 Solar Energy Collectors
Solar collectors are special kinds of heat exchangers that transform solar radiation energy to internal energy of the transport medium. The major component of any solar ... semiconducting or dielectric coating with high solar absorptance and high infrared transmittance on top of a nonselective, highly reflecting material such as metal ...
Efficient direct absorption solar collector based on hollow TiN ...
In this work, we propose a direct absorption solar collector (DASC) based on hollow TiN NPs for efficient solar harvesting. The optical properties of the hollow NPs are …
Diffuse Solar Micro‐Concentrators Using Dielectric …
Solar concentrators collecting non-normal-incidence radiation and diffuse light while retaining high concentration ratios are therefore an enticing technology for high-efficiency-low-cost photovoltaic systems.
EP0056373A1
Solar energy collector and its preparation method; the collector is characterized by a semiconductor coating (12) formed by the associated deposit of a metal (13) and a dielectric material (14), and by a relatively high solar absorption …
The compound parabolic concentrators for solar …
The amount of electrical energy produced by a given solar photovoltaic module can be increased by using concentrated solar radiation. The task can be accomplished by integrating optical ...
Design and development of compound parabolic concentrating …
Linear dielectric non-imaging concentrating covers for PV integrated building facades. Sol Energy (2000) A.F. Kothdiwala et al. ... The target of this paper is to proffer a review on PVT hybrid solar collectors which comprises the history of PVT hybrid solar systems, main concept, benefits and classifications according to various manners in ...
(PDF) Development of Self-Cleaning Solar Collectors …
We report here our research effort in developing an electrodynamic dust removal technology that can be used for keeping the solar collectors clean continuously without requiring water and...
The compound parabolic concentrators for solar photovoltaic ...
Solar radiation can be either converted to thermal energy or electrical energy by employing solar thermal collectors and solar PV modules, respectively (Kong et al., 2013). For electrical power generation, solar PV modules are the preferred choice. ... The authors considered a standard 2D CPC and a dielectric CPC (DCPC) for the cost estimation.
Numerical simulation and optimization of natural convection heat ...
Fig. 1 shows the geometry of the problem and arrangement of the electrodes. The dimensions are fixed at D = 60 m m for finding the optimized arrangement of electrodes without considering the effect of the lower plate, and D = 30 m m for designing a solar collector with the optimized arrangement of electrodes, d = 20 m m, and L = 150 m m.However, there …
Electric field combined nanofluid to enhance photothermal …
The use of nanofluid as working fluids in direct absorption solar collectors can increase the absorbance and extinction coefficient and decrease the transmittance of the base fluid, improving the solar absorption characteristics and photothermal conversion efficiency of the DASC system [13].Specifically, Furio et al. [14] investigated the high temperature behavior of …
Energies | Special Issue : Research on Solar Collector …
This Special Issue is intended to invite recent research on solar collectors for medium temperature applications, both line-focus and point-focus, conceived for industrial process heat or combined thermal and electrical …
Integration of solar thermal collectors and heat pumps with …
In an experimental study, Xuan et al. [35] introduced an innovative dielectric asymmetric CPC, as illustrated in Fig. 6 (c). Their results demonstrated that this CPC, featuring a geometric concentration ratio of 2.4, achieved an average increase of 87.0 % in short-circuit current and 96.6 % in maximum power within incidence angles of 0–85 ...
Planar Dielectric Collectors for Illumination and Solar Energy ...
In order to collect solar energy for both power conversion and illumination purposes, different systems, both metallic and dielectric, have been analyzed and partially tested. Particular …
Electric field combined nanofluid to enhance photothermal …
The use of nanofluid as working fluids in direct absorption solar collectors can increase the absorbance and extinction coefficient and decrease the transmittance of the base …
Nanofluid optical property characterization: towards efficient …
Suspensions of nanoparticles (i.e., particles with diameters < 100 nm) in liquids, termed nanofluids, show remarkable thermal and optical property changes from the base liquid at low particle loadings. Recent studies also indicate that selected nanofluids may improve the efficiency of direct absorption solar thermal collectors. To determine the effectiveness of …
A review of high-temperature selective absorbing coatings for solar …
The application of SSACs for solar collectors started in 1950s. Tabor applied black nickel, black chrome and NiS ZnS composites to flat-plate solar collectors by electro deposition [14]. ... The latter is the composites with metal partials distributing in a dielectric. By means of surface plasmon resonance [40] ...
Design and development of compound parabolic concentrating …
Parabolic trough solar collector (PTC) system with a flat receiver is widely used in concentrating photovoltaic/thermal (CPV/T) systems, where the flat receiver and PTC are the key components to ...
A review of applications of green nanofluids for performance ...
Solar collectors, among renewable energy sources, play a pivotal role in addressing these challenges. They must exhibit high thermodynamic efficiency while remaining environmentally friendly. Due to their exceptional properties, there is a growing interest in utilizing nanofluids in solar collectors. ... The dielectric constant of the base ...
(PDF) Photovoltaic/Thermal Solar Collectors
Hybrid PV/T solar collectors can be considered either as PV modules combined with a cooling component that can deliver a useful thermal output (hot water or air), or as thermal collectors with PV ...
Hybrid solar collector system showing selective …
Download scientific diagram | Hybrid solar collector system showing selective nanoparticle fluid filter for thermal energy and photovoltaic (PV) cell for direct electrical energy conversion. from ...
Design of high-temperature solar-selective coatings for …
The presented review is focused on synergistic approaches, processes, design crite-rions and advances in working fluids to achieve optimum thermal and exergy efficiency for solar collectors mainly ...
Ultra-wide broadband dielectric mirrors for solar collector …
Solar collector mirrors must provide high reflection across this spectral band without degrading over time. This work presents the results of a high-performance 200 mm parabolic mirror …
A novel solar power generation hybrid system comprising …
The respective relative dielectric constants of the ultracapacitor media. ... Compared to flat-plate solar collectors (FPSCs) [10] and concentrating solar collectors (CSCs) [11], evacuated tube solar collectors (ETSCs) [12] have the advantage of lower solar thermal losses and production costs, making them a focus in solar collector technology.
Solar Concentrators Using Dielectric Total Internal Reflection with ...
Building-integrated photovoltaics (BIPV) makes it possible to utilize building surfaces for power generation. However, BIPV is facing challenges of high material costs, difficulty of scaling, and …
Solar-biomass and dielectric drying of mace: An investigation on ...
Dielectric drying reduced the duration to 41.6 % with enhanced rate of drying. Moisture diffusivity values of solar-biomass and dielectric dried nutmeg mace were 2.30 -8 m 2 /s and 1.72 × 10-7 m 2 /s respectively. Instantaneous drying efficiencies under solar and microwave modes were in the range of 26.4 – 33.4 % and 32.5 – 41.2 % ...
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