Abstract: Heat pipe is an efficient heat transfer component. If the heat pipe and the trough concentrator with higher concentration ratio can be effectively combined, the operating temperature of working fluid can be increased obviously, thus achieving higher system thermal efficiency. Parabolic trough solar collector system with heat-pipe evacuated tube is designed in
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Abstract. The development of new technologies for energy generation and use has been increasing significantly. In this projection, the use of flat solar collectors to convert solar energy into thermal energy through water heating for residential and commercial purposes has grown due to the potential reduction of up to 40% in electrical energy consumption promoted
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Four models of flat-plate solar collectors were investigated: solar collectors with inclined baffles (SCIB), solar collectors with arched baffles (SCAB), solar collectors with
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This research aims to theoretically analyze the heat transfer characteristics of serpentine solar thermal collectors with elliptical and circular cross-sections. The solar thermal collector performance will be evaluated in
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Nowadays, there is wide acceptance among core energy experts and the research community that solar collectors have a critical role to play in the renewable energy sector. With the high-energy conversion rate associated with this solar energy harvesting technology, there is an urgent need to review various ways through which the heat transfer process can be improved.
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In this study, three-dimensional heat transfer and flow characteristics of hybrid nanofluids under turbulent flow condition in a parabolic trough solar collector (PTC) receiver has been investigated. Ag–ZnO/Syltherm 800, Ag–TiO2/Syltherm 800, and Ag–MgO/Syltherm 800 hybrid nanofluids with 1.0%, 2.0%, 3.0%, and 4.0% nanoparticle volume fractions are used as
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In this work, heat transfer mechanisms involved in solar thermal devices, such as flat plate collector, evacuated tube collector, solar concentrating collectors, solar pond, solar distillation, solar dryer, and solar refrigeration are discussed and important observations made
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A parametric study on the ambient-to-solarfluid heat transfer coefficient was conducted to determine the required solar collector heat transfer characteristics in this system setup. Moreover, solar collector area and storage tank volume were varied to investigate their impact on the system performance. A new performance indicator
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Solar collectors, which have become widespread in recent years, play a very important role in converting the sun''s radiant energy into thermal energy [4, 5]. Incident rays
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A copper U-tube based evacuated tube collector is filled with three different phase change materials, namely, lauric acid, paraffin wax, and stearic acid, to compare their heat transfer rates and melting characteristics for varying solar radiation during the day time 09:00 – 13:00. The effect of flow rate of heat transfer fluid i.e., water is also investigated for all three
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Due to the accumulation of residual gas, vacuum failure may occur in the annulus of evacuated collector tube in solar trough thermal power system, resulting in the changes of flow and heat transfer mechanism and characteristics. In this paper, based on the actual situation of solar radiation in summer of Chongqing, China, the flow and heat transfer characteristics of the
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For solar thermal applications, solar irradiation is absorbed by a solar collector as heat which is then transferred to its working fluid (air, water or oil). The heat carried by the
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Heat transfer characteristics of supercritical CO 2 (S-CO 2) fluid in collectors of a solar Rankine cycle system is experimentally investigated at different flow conditions the experiments, temperature, pressure and mass flow rate are measured, and local and average heat transfer coefficients are investigated.
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In experiment, the average temperature of PCM, outlet air temperature and heat collecting efficiency under different operating conditions, exothermic condition and adverse
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It is imperative to understand the heat transfer behavior of solar energy harvesting systems to enhance their efciency. Understanding heat transfer concepts help the researchers. to grab a
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Solar collectors using sodium carbonate decahydrate (Na 2 CO 3 ·10H 2 O) are more efficient than conventional systems in collecting hot water in winter. Na 2 CO 3 ·10H 2 O has a melting point of 306 K and a latent
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Heat and mass transfer mechanisms of transpired solar collectors (TSCs) were analysed. TSCs can be integrated with different energy technologies to improve flexibility.
Learn More An experimental system of parabolic trough solar collector and heat transfer was set up with a new molten salt employed as the heat transfer medium (with a melting point of 86 °C and a working temperature upper limit of 550 °C). The circulation of molten salts in the system took place over 1000 h. Experiments were conducted to obtain the heat
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The study of gas–liquid two-phase flow and heat transfer in non-Newtonian fluids is of great significance for the research and development of refrigeration and energy storage. In this paper, the characteristics and influencing factors of the phase change reaction in microalgae slurry were studied by numerical simulation and experimental verification.
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A comprehensive literature review of recent studies on heat transfer enhancement techniques in solar collectors was undertaken. Key challenges, knowledge gaps, and limitations were
Learn MoreNowadays, most of researches on flat-plate solar collector are devoted to improving the collector heat transfer performance. The design of flow channel and air flow mode between endothermic board and glass cover plate is optimized to increase heat transfer area and performance,,,, .
Solar collectors need to have good optical performance (absorbing as much heat as possible), whilst the thermal storage subsystems require high thermal storage density (small volume and low construction cost), excellent heat transfer rate (absorb and release heat at the required speed) and good long-term durability, .
Lanjewar investigated on solar collector with a W-shaped fin experimentally and discovered the best heat transfer performance was 60 ° of W-shaped fin angle. Experimental study on heat transfer performance of solar collector with finned installation angle of 60 ° was performed by Promvonge .
Solar thermal collectors have been widely studied, and various new designs were reported. To improve the performance of these solar devices, it is essential to understand the heat transfer behavior of the systems.
This work also incorporates those aspects of heat transfer which are vital in the design and analysis of solar thermal collectors and systems. The solar collectors can be classi fied into two main categories, namely, non-concentrating and concentrating.
An overview of existing and future solar power stations. A solar collector, the special energy exchanger, converts solar irradiation energy either to the thermal energy of the working fluid in solar thermal applications, or to the electric energy directly in PV (Photovoltaic) applications.
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