Journal articles: 'Solar thermal concentrator'

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M.V, Bindu, and Herbert Joselin. "Enhancement of Thermal Performance of Solar Parabolic Trough Concentrator-Techniques- Review." Bonfring International Journal of Industrial Engineering and Management Science 9, no. 3 (September 30, 2019): 16–20. http://dx.doi.org/10.9756/bijiems.9033.

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Nikitin, Victor, Roman Zaitsev, Tatiana Khramova, and Alina Khrypunova. "DEVELOPMENT OF A FACETED CONCENTRATOR FOR A COMBINED PHOTOVOLTAIC PLANT." Energy saving. Power engineering. Energy audit., no. 5-6(171-172) (November 30, 2022): 47–58. http://dx.doi.org/10.20998/2313-8890.2022.05.04.

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This article examines the features of solar energy concentrators. The characteristics of the currently existing types of solar energy concentration systems are given: a weak concentration system and a high concentration system. Their design features and shortcomings are given. It is noted that Frenel lenses are one of the most widely used concentrators, but their optical efficiency is limited by low or high temperatures, as a change in the refractive index or deformation of the Frenel lens structure is observed due to thermal expansion. Fresnel lenses, which focus solar radiation on an area of up to 1 cm 2, do not allow the utilization of excess thermal energy. The complex geometric shape of parabolic concentrators determines the expensive technology of their manufacture, which, in turn, significantly increases the cost of the electric energy produced by them. Luminescent solar concentrators have a low coefficient of concentration of solar energy. The conducted analysis showed that the existing concentrators of solar radiation do not allow to create competitive compared to traditional sources of electrical energy photo-energy installations that work at high levels of concentration of solar radiation and utilize excess thermal energy. In order to solve the mentioned problems, the authors developed a faceted concentrator of solar radiation, gave its characteristics and presented a laboratory sample. Questions of optimization of the adjustment of the concentrator are investigated. A report on the mock-up tests conducted has been published.

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Thirunavukkarasu, V., and M. Cheralathan. "Thermal Performance of Solar Parabolic Dish Concentrator with Hetero-Conical Cavity Receiver." Applied Mechanics and Materials 787 (August 2015): 197–201. http://dx.doi.org/10.4028/www.scientific.net/amm.787.197.

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Concentrated solar collectors have high efficiency as compared to flat plate and evacuated tube solar collectors. Cavity receivers are mainly used on the parabolic dish concentrators and tower type concentrator systems. The heat transfer surfaces of cavity receiver are composed by coiled metal tube. Heat transfer fluid flows in the internal spaces of coiled metal tube, and the external surfaces would absorb the highly concentrated solar energy. This paper explains the thermal performance of parabolic dish concentrator system with hetero-conical cavity receiver. The experimental analysis was done during the month of April 2014 on clear sunny days at Chennai [Latitude: 13.08oN, Longitude: 80.27oE] to study its thermal performance.

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PORTELA, Lino Wagner Castelo Branco, Ana Fabíola Leite ALMEIDA, Erilson de Sousa BARBOSA, Kleber Lima CEZAR, and Patrick Abreu OLIVEIRA. "ENERGY ANALYSIS AND PERFORMANCE OF A PARABOLIC CYLINDRICAL SOLAR COLLECTOR AIDED BY SOLAR TRACKING SYSTEM." Periódico Tchê Química 17, no. 34 (March 20, 2020): 53–61. http://dx.doi.org/10.52571/ptq.v17.n34.2020.71_p34_pgs_53_61.pdf.

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Over the last few years, countries such as Brazil, the United States, Germany, and China have been receiving significant investments to advance the use of renewable energy sources, such as solar energy, biomass and wind. This has been due to the growing demand for electricity due to population increase and the evolution of industrial activities. Solar energy can be enjoyed by using solar concentrators that are commonly used in solar thermal systems where the working fluid reaches higher temperatures than can be obtained from other collectors. These concentrators are responsible for providing the thermal energy supply. This research analyzed the energy influence of Parabolic Solar Concentrator technology aided by a solar tracking system, taking into account its energy balance and thermal efficiency calculation. The concentrator had an optical efficiency of 81 % and was able to achieve average thermal efficiency values between 21.8 % and 24.7 % under maximum solar radiation conditions between 900 W/m² and 990 W/m². The temperature of the absorber tube used to receive the concentration of sunlight reached temperatures between 80 °C and 98.6 °C, allowing the system working fluid a temperature to reach values above 100 °C. These results show the ability of this type of solar collector to provide power for thermal applications such as heating water for industrial or domestic processes, food dehydration, and drying, refrigeration, thermal desalination and microgeneration of electricity. Besides, the thermal efficiency (between 21.8 % and 24.7 %) was satisfactory when considering the type of concentrator, which also validates the electronic tracking system as it was able to track the relative movement of the sun and favor the increase of thermal efficiency of the system.

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Ullah, Fahim, Mansoor K. Khattak, and Kang Min. "Experimental investigation of the comparison of compound parabolic concentrator and ordinary heat pipe-type solar concentrator." Energy & Environment 29, no. 5 (February 21, 2018): 770–83. http://dx.doi.org/10.1177/0958305x18759791.

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In this research study, we have compared between the two different concentrators with the flat absorber plate receiver of the compound parabolic concentrator heat pipe solar concentrator and ordinary heat pipe flat plate solar concentrator. For the reproduction of solar radiation in the experiment, iodine tungsten lamp was used. Thermal performance comparison of the two types of solar concentrator under different simulating radiation intensity conditions was carried out with including the fluid temperature, instantaneous efficiency, average efficiency, and average heat loss coefficient. The results of the experiment indicate that the compound parabolic concentrator heat pipe-type solar concentrator not only increased the fluid temperature and instantaneous efficiency but also decreased the average heat loss coefficient as compared with the ordinary heat pipe flat plate solar concentrator. It was noticed from the experimental results that the efficiency of compound parabolic heat pipe solar concentrator was higher than ordinary heat pipe solar concentrator up to 6 and 10°C with the light intensity, that is I = 679 W/m2 and I = 892 W/m2, respectively. From the results, it was concluded that the using of compound parabolic heat pipe solar concentrator increased the thermal performance of solar concentrator.

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Ghazouani, Karima, Safa Skouri, Salwa Bouadila, and Amenallah Guizani. "Thermal Study of Solar Parabolic Concentrator." IOSR Journal of Mechanical and Civil Engineering 16, no. 053 (December 2016): 118–23. http://dx.doi.org/10.9790/1684-1605304118123.

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Panchenko, Vladimir. "Photovoltaic Thermal Module With Paraboloid Type Solar Concentrators." International Journal of Energy Optimization and Engineering 10, no. 2 (April 2021): 1–23. http://dx.doi.org/10.4018/ijeoe.2021040101.

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The article presents the results of the development and research of the solar photovoltaic thermal module with paraboloid type solar radiation concentrators. The structure of the solar module includes a composite concentrator, which provides uniform illumination by concentrated solar radiation on the surface of the cylindrical photovoltaic thermal photoreceiver in the form of the aluminum radiator with photovoltaic converters. When exposed in concentrated solar radiation, the electrical efficiency of specially designed matrix photovoltaic converters increases, and the heat taken by the heat carrier increases the overall efficiency of the solar module. Uniform illumination of photovoltaic converters with concentrated solar radiation provides an optimal mode of operation. The consumer can use the received electric and thermal energy in an autonomous or parallel power supply with the existing power grid.

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Gandhe, V. B., A. Venkatesh, and V. Sriramulu. "Thermal analysis of an FMDF solar concentrator." Solar & Wind Technology 6, no. 3 (January 1989): 197–202. http://dx.doi.org/10.1016/0741-983x(89)90069-6.

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Barbosa, Flávia V., João L. Afonso, Filipe B. Rodrigues, and José C. F. Teixeira. "Development of a solar concentrator with tracking system." Mechanical Sciences 7, no. 2 (November 17, 2016): 233–45. http://dx.doi.org/10.5194/ms-7-233-2016.

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Abstract. Solar Energy has been, since the beginning of human civilization, a source of energy that raised considerable interest, and the technology used for their exploitation has developed constantly. Due to the energetic problems which society has been facing, the development of technologies to increase the efficiency of solar systems is of paramount importance. The solar concentration is a technology that has been used for many years by the scientist, because this system enables the concentration of solar energy in a focus, which allows a significant increase in energy intensity. The receiver, placed at the focus of the concentrator, can use the stored energy to produce electrical energy through Stirling engine, for example, or to produce thermal energy by heating a fluid that can be used in a thermal cycle. The efficiency of solar concentrators can be improved with the addition of a dual axis solar tracker system which allows a significant increase in the amount of stored energy. In response to the aforementioned, this paper presents the design and construction of a solar dish concentrator with tracking system at low cost, the optical and thermal modelling of this system and a performance analysis through experimental tests. The experimental validation allows to conclude that the application of a tracking system to the concentrator is very important since a minimum delay of the solar radiation leads to important losses of system efficiency. On the other hand, it is found that the external factors can affect the final results which include the optical and geometrical properties of the collector, the absorptivity and the position of the receiver as well as the weather conditions (essentially the wind speed and clouds). Thus, the paper aims to present the benefits of this technology in a world whose the consumption of energy by fossil fuels is a real problem that society needs to face.

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Al Imam, Md Forhad Ibne, Rafiqul Alam Beg, and Shamimur Rahman. "Thermal Performance Improvement Study of a Solar Collector with Compound Parabolic Concentrator." European Journal of Engineering Research and Science 3, no. 11 (November 30, 2018): 78–82. http://dx.doi.org/10.24018/ejers.2018.3.11.970.

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Heating water with solar energy is easy and effective in both domestic and industrial areas. The initial implementation cost of a solar-water-heating system is high but long term use of it makes it cost effective. For geographical location, Bangladesh is very suitable for using it. In a solar collector system, collector area is an important design factor. To achieve better thermal performance, 0.81m2 solar collector was used in this study. Commonly used flat plate collector takes more space to be installed. In Bangladesh, space on the roofs of houses and industries are limited and so there is a little scope to use flat plate collector system. Compound parabolic collector can solve this problem. Solar collector with compound parabolic collector needs less space than flat plate collector with reflector. When compound parabolic concentrator was attached with the solar collector, thermal performance improves. Compare with other alternatives that improve thermal efficiency, compound parabolic concentrator shows better thermal performance. Compare thermal efficiency of the consecutive three months. In this system, when water flow rate increase, outlet water temperature decrease but thermal efficiency increases. It is also observed that when solar intensity increases, thermal efficiency also increases likewise when solar intensity decreases, thermal efficiency also decreases. In this research, outputs of different similar researches are compared to show the effectiveness of the compound parabolic concentrator based solar collector. The compound parabolic concentrator reflects more solar radiation, eventually directs it to the collector and increased the difference between the inlet and outlet water temperature.

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Al Imam, Md Forhad Ibne, Rafiqul Alam Beg, and Shamimur Rahman. "Thermal Performance Improvement Study of a Solar Collector with Compound Parabolic Concentrator." European Journal of Engineering and Technology Research 3, no. 11 (November 30, 2018): 78–82. http://dx.doi.org/10.24018/ejeng.2018.3.11.970.

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Heating water with solar energy is easy and effective in both domestic and industrial areas. The initial implementation cost of a solar-water-heating system is high but long term use of it makes it cost effective. For geographical location, Bangladesh is very suitable for using it. In a solar collector system, collector area is an important design factor. To achieve better thermal performance, 0.81m2 solar collector was used in this study. Commonly used flat plate collector takes more space to be installed. In Bangladesh, space on the roofs of houses and industries are limited and so there is a little scope to use flat plate collector system. Compound parabolic collector can solve this problem. Solar collector with compound parabolic collector needs less space than flat plate collector with reflector. When compound parabolic concentrator was attached with the solar collector, thermal performance improves. Compare with other alternatives that improve thermal efficiency, compound parabolic concentrator shows better thermal performance. Compare thermal efficiency of the consecutive three months. In this system, when water flow rate increase, outlet water temperature decrease but thermal efficiency increases. It is also observed that when solar intensity increases, thermal efficiency also increases likewise when solar intensity decreases, thermal efficiency also decreases. In this research, outputs of different similar researches are compared to show the effectiveness of the compound parabolic concentrator based solar collector. The compound parabolic concentrator reflects more solar radiation, eventually directs it to the collector and increased the difference between the inlet and outlet water temperature.

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12

Schneider, F. P., C. E. C. Nogueira, Fernando Toniazzo, S. N. M. Souza, J. A. C. Siqueira, I. L. Nogueira, and D. R. Santos. "Characterization of a Water Heating System Using Solar Collector With Conical Concentrator." Journal of Agricultural Science 10, no. 12 (November 15, 2018): 405. http://dx.doi.org/10.5539/jas.v10n12p405.

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This study aimed to evaluate a solar water heating system for using on residences, using a solar collector with conical concentrator. The principle of light concentration in a solar collector with conical concentrator is the capture and reflection of solar radiation in the center of a tapered concentrator with internal reflective faces. The area of concentration of solar energy is occupied by a receiver with material of high thermal conductivity, properly isolated by transparent surfaces, to form the greenhouse effect, where the thermal energy is transferred to a working fluid. The characterization of the system was done through field tests to determine the efficiency in the water heating. The tests were performed considering different scenarios, which varied according to the heating system (passive and active with different water flow) and solar tracking (manual adjustment and stationary). The results showed that the scenarios with solar tracking presented an average efficiency of 12.63%, which was more efficient than those presented by the fixed orientation, which was 11.44%. Besides that, it was verified that the active solar heating systems were more efficient than the passive ones.

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Panchenko, Vladimir. "Roofing Solar Panels of Planar and Concentrator Designs." International Journal of Energy Optimization and Engineering 9, no. 4 (October 2020): 20–40. http://dx.doi.org/10.4018/ijeoe.2020100102.

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Solar roofing panels fulfill both building protective functions and energy generating ones. The composition of the substrate of the solar roofing panel includes secondary raw materials, which has a positive effect on the environment. To increase the electrical efficiency and also to obtain thermal energy in the form of warm water, it was proposed to create a photovoltaic thermal roofing panel. For this purpose, the presented article describes the method of creating a three-dimensional model of solar photovoltaic thermal modules in a computer-aided design system. The article also proposes a method for manufacturing a prototype body for a solar roofing panel, manufactured using additive technologies, which will significantly reduce costs at the initial stage of creating a prototype due to the possibility of operational changes to a three-dimensional model followed by printing a modified and optimized model. To reduce the number of photovoltaic cells and the cost of a solar roofing panel, it is proposed to use a solar concentrator in the panel.

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Li, Guiqiang, and Yi Jin. "Optical Simulation and Experimental Verification of a Fresnel Solar Concentrator with a New Hybrid Second Optical Element." International Journal of Photoenergy 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/4970256.

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Fresnel solar concentrator is one of the most common solar concentrators in solar applications. For high Fresnel concentrating PV or PV/T systems, the second optical element (SOE) is the key component for the high optical efficiency at a wider deflection angle, which is important for overcoming unavoidable errors from the tacking system, the Fresnel lens processing and installment technology, and so forth. In this paper, a new hybrid SOE was designed to match the Fresnel solar concentrator with the concentration ratio of 1090x. The ray-tracing technology was employed to indicate the optical properties. The simulation outcome showed that the Fresnel solar concentrator with the new hybrid SOE has a wider deflection angle scope with the high optical efficiency. Furthermore, the flux distribution with different deviation angles was also analyzed. In addition, the experiment of the Fresnel solar concentrator with the hybrid SOE under outdoor condition was carried out. The verifications from the electrical and thermal outputs were all made to analyze the optical efficiency comprehensively. The optical efficiency resulting from the experiment is found to be consistent with that from the simulation.

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Harris, James A., and Terry G. Lenz. "Thermal performance of solar concentrator/cavity receiver systems." Solar Energy 34, no. 2 (1985): 135–42. http://dx.doi.org/10.1016/0038-092x(85)90170-7.

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Sinha, S., and G. N. Tiwari. "Thermal evaluation of concentrator-assisted solar distillation system." Heat Recovery Systems and CHP 12, no. 6 (November 1992): 481–88. http://dx.doi.org/10.1016/0890-4332(92)90016-b.

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Megahed, I. E., M. M. Elsayed, and M. M. El-Refaee. "Fluidized bed- solar concentrator thermal storage system performance." Wärme- und Stoffübertragung 23, no. 4 (July 1988): 187–94. http://dx.doi.org/10.1007/bf01807320.

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Liu, Yun, and Hong Zhang. "Selection of Working Fluids for Medium Temperature Heat Pipes Used in Parabolic Trough Solar Receivers." Advanced Materials Research 860-863 (December 2013): 62–68. http://dx.doi.org/10.4028/www.scientific.net/amr.860-863.62.

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According to the methods of focusing,the solar thermal generation can be classified to tower system,parabolic trough system and dish-stirling system. The parabolic solar thermal generation system is an important type of solar thermal utilization. Compared to tower and dish-stirling system,the parabolic trough system has many advantages such as the small concentration ratio,the simple process,the low material requirement and the simple tracking device because of many concentrator on-axis tracking. The parabolic trough system is the lowest cost, least close to commercialization,larger potential system optimization,and the most suitable to large operation in this three thermal generation systems [1,. The parabolic trough system is composed of concentrator and receiver,and the receiver is the key component that uses solar energy to heat working fluids in receiver. Therefore,the key problem is how to make the solar energy transfer to subsequent generation system efficiently and stably.

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Mahmood, Yaseen H., R. Y. J. Al-Salih, Saif Amer Mahdi, and Abdelrahman Mohamed Ibrahim. "Thermal Analysis of the Solar Dish Array Concentrator System." Advances in Materials Science and Engineering 2022 (February 1, 2022): 1–8. http://dx.doi.org/10.1155/2022/1823630.

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This research aimed at fabricating solar array concentrator. It is one of the best options for solar energy concentration. Compared with other systems, because of the higher concentration ratios and high control focal length, good accept angles, higher efficiency, rigid with high wind, and low cost, the system has been locally designed and fabricated to produce steam. The dimensions of the active aperture area of 3.25 m2 were studied. The absorber receiver, which conveyed water as heat in a closed cycle with an appropriate pump, produced steam at a higher temperature and with more efficiency. The best characterizations of the system are the focal length 1.25 m, concentration ratio 103, optical power 1.2 kW, losses 0.2 kW, and efficiency 60–70%.

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Jenkins, D., R. Winston, J. Bliss, J. O’Gallagher, A. Lewandowski, and C. Bingham. "Solar Concentration of 50,000 Achieved With Output Power Approaching 1 kW." Journal of Solar Energy Engineering 118, no. 3 (August 1, 1996): 141–45. http://dx.doi.org/10.1115/1.2870882.

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We have achieved a 50,000 ± 3,000 times concentration of sunlight using a unique dielectric nonimaging concentrator in an experiment performed at the National Renewable Energy Laboratory. The scale of the experiment is several times larger than that of previous experiments. Total output power approaching 1 kW passes through a 4.6 mm diameter aperture. An extractor tip is added to the concentrator profile which allows measurement of flux levels using an air calorimeter. This new device has the potential to allow the use of dielectric concentrators at larger scale for thermal electric power generation. We report on the implications of this experiment for the future use of dielectric concentrators.

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Ghodbane, Mokhtar, Djamel Benmenine, Abderrahmane Khechekhouche, and Boussad Boumeddane. "Brief on Solar Concentrators: Differences and Applications." Instrumentation Mesure Métrologie 19, no. 5 (November 15, 2020): 371–78. http://dx.doi.org/10.18280/i2m.190507.

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In light of the global crises that the world suffers from, the renewable energy exploitation is a viable solution to remedy the various energy crises, knowing that renewable energy is a source of environmental credibility, as it does not cause any pollution or any emissions harmful to the environment. Among the most important renewable energy sources, solar energy is the most important type as it can be exploited thermally by adopting various solar collectors, especially solar concentrators. This paper has been devoted to illustrate the types of solar concentrators, namely point-focus concentrators (Heliostat Field Collectors and Parabolic Dish Collectors) and linear concentrators (Linear Fresnel Reflectors and Parabolic Trough Collectors), in an attempt to clarify its principle and its multiple uses domestically and industrially, especially in areas that are characterized by the abundance of its direct solar radiation. The solar concentrator is a solar thermal energy concentration system, because its use reduces the consumption of fossil fuels harmful to the environment and directly contributes to climate change. Solar thermal concentrators are an effective alternative to fossil generators for thermal energy, as they have many important uses such as the solar electricity production of solar electricity in power plants, industrial and domestic water heating, and have many other industrial uses.

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Синицын, Сергей, Sergey Sinitsyn, Д. Стребков, D. Strebkov, Владимир Панченко, and Vladimir Panchenko. "Parquetting the Surface of a Parabolic Concentrator of a Solar Photovoltaic Thermal Module According to Given Differential- Geometric Requirements." Geometry & Graphics 7, no. 3 (December 2, 2019): 15–27. http://dx.doi.org/10.12737/article_5dce6084f1ac94.09740392.

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The article discusses the geometric aspects of the design and creation of parabolic-type solar radiation concentrators. Practical methods of geometric design and manufacturing of concentrators of this kind are presented. Parabolic type concentrator is the main part of the solar photovoltaic thermal installation. Its effectiveness depends on the quality factors of the geometric shaping of the working surface, composed of a set of parquet components, linked to each other on the basis of differential geometric requirements. The distribution of illumination in the focal spot of such a concentrator, made by parquet based on the constructive connection of individual elements, makes it possible to obtain acceptable results. However, there is considerable potential for improving performance by providing a smoother and more uniform illumination of the photodetector. To ensure the specified accuracy and smoothness of the rim of the surface at the stages of designing and manufacturing the device, two methods are proposed: orthogonal and fan-shaped geometric parquetting of the surface of a parabolic concentrator with the ability to pre-set the required shape accuracy for given rim geometrical characteristics. Parquetting with given differential requirements for the surface, in turn, provides for two methods for calculating parquet elements: first, by the minimum number of curvilinear elements followed by stitching, taking into account the differential conditions; the second is based on the maximum number of flat elements, the multiplicity of which provides acceptable smooth surface properties. In this paper, we consider the first method for cases of orthogonal and fan parquet. On the example of a parabolic concentrator, the implementation of the considered method is presented, which provides for the possibility of controlling the geometric smoothness of the concentrator surface in order to ensure optimal distribution of concentrated solar radiation in the focal region. The output characteristics of photovoltaic and thermal converters of solar energy, which are in the focus of such a concentrator, become optimal, and the installation itself will operate in nominal mode.

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Ouédraogo, Salifou, Thierry S. M. Ky, Amadou Konfé, Sié Kam, and D. Joseph Bathiébo. "Expérimentation et analyse thermique d’un concentrateur hémisphérique stationnaire sous les conditions climatiques à Ouagadougou, Burkina Faso." Journal de Physique de la SOAPHYS 2, no. 1b (March 5, 2021): C20A04–1—C20A04–1. http://dx.doi.org/10.46411/jpsoaphys.2020.01.04.

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This technology is used in drying, domestic water heating or in the production of electricity. However, it uses a solar tracking system that is too complex and expensive for countries with less equipment and high solar potential. In this study, we are interested in the experimentation and thermal analysis of a stationary hemispheric concentrator. The numerical resolution of the caustic equations of a spherical concentrator allowed to determine the dimensions and the position of the receiver, necessary for the design of the physical model and the assembly of the experimental device. The results of the 3D numerical simulation with the Comsol5.3a software allowed to highlight the ray tracing and the profile of the flow concentrated on the receiver. The results obtained experimentally show that the receiver and the air inside reached a maximum temperature of 224°C and 97.6°C respectively. The solar concentration device studied is therefore technically favorable for thermal applications requiring intermediate temperatures.

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Felsberger, Richard, Armin Buchroithner, Bernhard Gerl, and Hannes Wegleiter. "Conversion and Testing of a Solar Thermal Parabolic Trough Collector for CPV-T Application." Energies 13, no. 22 (November 23, 2020): 6142. http://dx.doi.org/10.3390/en13226142.

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In the field of solar power generation, concentrator systems, such as concentrator photovoltaics (CPV) or concentrated solar power (CSP), are subject of intensive research activity, due to high efficiencies in electrical power generation compared to conventional photovoltaics (PV) and low-cost energy storage on the thermal side. Even though the idea of combining the thermal and electrical part in one absorber is obvious, very few hybrid systems (i.e., concentrator photovoltaics-thermal systems (CPV-T)) are either described in literature or commercially available. This paper features the conversion of a commercial thermal parabolic trough collector to a CPV-T hybrid system using multi-junction PV cells. The design process is described in detail starting with the selection of suitable PV cells, elaborating optical and mechanical system requirements, heat sink design and final assembly. Feasibility is proven by practical tests involving maximum power point tracking as well as empirical determination of heat generation and measurement results are presented.

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Kulkarni, Mohan, Sunil Dingre, and Chandrakant Kulkarni. "A comparative study and graphical analysis in designing and operation of Solar Thermal circular concentrator for enhancing efficiency of solar concentrating system." E3S Web of Conferences 170 (2020): 01001. http://dx.doi.org/10.1051/e3sconf/202017001001.

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The present line concentrator system with constant concentration ratio exhibits rise in temperature of working media, however if the difference between outlet and inlet temperature of working media is large then they exhibit lower efficiency. Also the rate of fall of efficiency with increase in its temperature difference is high. To overcome this problem it is proposed to have a variable concentration ratio concentrator system. The variable concentration ratio is achieved by employing receiver consisting of the pipes having different diameters; with the larger diameter pipe at start followed by small diameter receiver. Thus, the concentrator system will have different diameter receivers offering variable concentration ratio system. This concept is confirmed with the help of G.O. Lof, Fester and Duffie Beck paper. The present paper describes above concept by graphical analysis carried out for the newly proposed circular line concentrator with variable concentration ratio. The results of superimposition of graphs leads to confirmation for the promisingly use of variable concentration ratio receivers for enhancing efficiency of solar concentrating system.

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Mancini, Thomas R. "Analysis and Design of Two Stretched-Membrane Parabolic Dish Concentrators." Journal of Solar Energy Engineering 113, no. 3 (August 1, 1991): 180–87. http://dx.doi.org/10.1115/1.2930490.

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The state-of-the-art of parabolic dish solar concentrators is the faceted, glass-metal dish. The mass production costs of glass-metal dishes may be high because they do not incorporate the innovations of design and materials developed over the last eight years. Therefore, Sandia National Laboratories has undertaken to develop two stretched-membrane parabolic dish concentrators for the Department of Energy’s Solar Thermal Program. These solar concentrators are being designed for integration with an advanced solar receiver and a Stirling engine/generator in a 25-kWe power production unit. The first dish, which builds on the successful design of the stretched-membrane heliostats, is to be a low risk, near-term commercial solar concentrator. This solar concentrator comprises 12 large, 3.6-m diameter, stretched-membrane facets that are formed into parabolic shapes either with a large vacuum or by performing the thin membranes plastically. The focal length-to-diameter ratios (f/Ds) for the facets are about 3.0, relatively large for a dish but much lower than heliostats where they typically range from 50 to 100. Two contractors are currently fabricating facets for this dish, and a third contractor is designing the facet support structure and pedestal for the dish. The second stretched-membrane concentrator is a single-element monolithic dish with an f/D of 0.6. The dish is shaped into a parabola by plastically yielding the membrane using a combination of uniform and nonuniform loading. Initial measurements of the dish indicate that it has a slope error of 2.6 milliradians (one standard deviation) relative to a perfect parabola. In this paper, the designs of the two stretched-membrane dishes are analyzed using the computer code CIRCE to model the optical performance of the concentrators and a thermal model, which includes conduction, convection, and radiation heat transfer, to calculate the thermal losses from the cavity solar receivers. The solar collector efficiency, defined as the product of the optical efficiency of the collector and the thermal efficiency of the receiver, is optimized for comparing the performance of several solar concentrator configurations. Ten facet arrangements for the faceted stretched-membrane dish and the single-element stretched-membrane dish are modeled and their performances compared with that of a state-of-the-art glass-metal dish. Last, the initial designs of these two stretched-membrane dishes are described along with the results of preliminary performance measurements on their respective optical elements.

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Pavlovic, Sasa, Velimir Stefanovic, and Suad Suljkovic. "Optical modeling of a solar dish thermal concentrator based on square flat facets." Thermal Science 18, no. 3 (2014): 989–98. http://dx.doi.org/10.2298/tsci1403989p.

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Solar energy may be practically utilized directly through transformation into heat, electrical or chemical energy. We present a procedure to design a square facet concentrator for laboratory-scale research on medium-temperature thermal processes. The efficient conversion of solar radiation into heat at these temperature levels requires the use of concentrating solar collectors. Large concentrating dishes generally have a reflecting surface made up of a number of individual mirror panels (facets). Optical ray tracing is used to generate a system performance model. A square facet parabolic solar concentrator with realistic specularly surface and facet positioning accuracy will deliver up to 13.604 kW of radiative power over a 250 mm radius disk (receiver diameter) located in the focal plane on the focal length of 1500mmwith average concentrating ratio exceeding 1200. The Monte Carlo ray tracing method is used for analysis of the optical performance of the concentrator and to identify the set of geometric concentrator parameters that allow for flux characteristics suitable for medium and high-temperature applications.

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STREBKOV, DMITRIY, and NATAL’YA FILIPPCHENKOVA. "RESULTS OF THE PERFORMANCE NUMERICAL SIMULATION OF A SOLAR CONCENTRATOR MODULE WITH A THERMAL-PHOTOVOLTAIC RECEIVER." Elektrotekhnologii i elektrooborudovanie v APK 4, no. 41 (December 2020): 51–56. http://dx.doi.org/10.22314/2658-4859-2020-67-4-51-56.

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In the field of energy supply to agro-industrial facilities, there is an increasing interest in the development of structures and engineering systems using renewable energy sources, including solar concentrator thermal and photovoltaic modules that combine photovoltaic modules and solar collectors in one structure. The use of the technology of concentrator heat and photovoltaic modules makes it possible to increase the electrical performance of solar cells by cooling them during operation, and significantly reduces the need for centralized electricity and heat supply to enterprises of the agroindustrial complex. (Research purpose) The research purpose is in numerical modeling of thermal processes occurring in a solar concentrator heat-photovoltaic module. (Materials and methods) Authors used analytical methods for mathematical modeling of a solar concentrator heat and photovoltaic module. Authors implemented a mathematical model of a solar concentrator heat and photovoltaic module in the ANSYS Fluent computer program. The distribution contours of temperature and pressure of the coolant in the module channel were obtained for different values of the coolant flow rate at the inlet. The verification of the developed model of the module on the basis of data obtained in an analytical way has been performed. (Results and discussion) The results of comparing the calculated data with the results of computer modeling show a high convergence of the information obtained with the use of a computer model, the relative error is within acceptable limits. (Conclusions) The developed design of the solar concentrator heat and photovoltaic module provides effective cooling of photovoltaic cells (the temperature of photovoltaic cells is in the operating range) with a module service life of at least twenty-five years. The use of a louvered heliostat in the developed design of a solar concentrator heat and photovoltaic module can double the performance of the concentrator.

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Meng, Xian-long, Fu-Peng Ren, Peng Zhang, and Zi-xuan Tang. "Trough-Type Free-Form Secondary Solar Concentrator for CPV/T Application." Energies 15, no. 21 (October 28, 2022): 8023. http://dx.doi.org/10.3390/en15218023.

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Imaging concentrators like the parabolic trough solar concentrators have been widely employed for energy production in solar power plants. The conventional imaging solar concentrators form a non-uniform Gaussian distribution on receiving absorbers yielding the highest temperatures. The traditional CSP system normally truncated a peripheral region of heat flux to better use the central part. CPV/T systems using the waste heat recovery method can largely improve the total efficiency. However, for the CPV module, the coolant temperature was usually below 80 °C, which limited the applications of the thermal cycle such as the ORC system. In this article, a novel trough-type free-form secondary solar concentrator (TFSC) for PV/Thermal hybrid application has been proposed. Different from other CPV/T concepts using a combined PV panel and cooling tunnel/tube, the current concept separates the receiver in two parts. The secondary free-form reflector is generated by the geometric construction method, resulting in uniform heat flux in the edge region and high concentration in the central region. Through the ray tracing method, the optical properties have been verified. Sensitivity analysis of the concentrating structure is also conducted. The results provide supports for the design and applications of novel CPV/T systems.

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R Senthil , A P Nishanth, R. Senthil ,. A. P. Nishanth. "Optical and Thermal Performance Analysis of Solar Parabolic Concentrator." International Journal of Mechanical and Production Engineering Research and Development 7, no. 5 (2017): 367–74. http://dx.doi.org/10.24247/ijmperdoct201737.

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Tashtoush, G. M., M. Jaradat, and S. Al-Bader. "Thermal design of parabolic solar concentrator adsorption refrigeration system." Applied Solar Energy 46, no. 3 (November 2010): 212–23. http://dx.doi.org/10.3103/s0003701x10030126.

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Mullick, S. C., T. C. Kandpal, and Subodh Kumar. "Thermal test procedure for a paraboloid concentrator solar cooker." Solar Energy 46, no. 3 (1991): 139–44. http://dx.doi.org/10.1016/0038-092x(91)90087-d.

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Min, Cui, Chen Nuofu, Yang Xiaoli, Wang Yu, Bai Yiming, and Zhang Xingwang. "Thermal analysis and test for single concentrator solar cells." Journal of Semiconductors 30, no. 4 (April 2009): 044011. http://dx.doi.org/10.1088/1674-4926/30/4/044011.

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Gomaa, Mohamed, Ramadan Mustafa, Hegazy Rezk, Mujahed Al-Dhaifallah, and A. Al-Salaymeh. "Sizing Methodology of a Multi-Mirror Solar Concentrated Hybrid PV/Thermal System." Energies 11, no. 12 (November 23, 2018): 3276. http://dx.doi.org/10.3390/en11123276.

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The use of a concentrated photovoltaic (CPV) system significantly reduces the required solar cell area that often accounts for the major cost of a PV solar system. A comprehensive performance analysis of a multi-mirror solar concentrated hybrid PV thermal (CPVT) system was conducted. Among different concentrating systems, Linear Fresnel Reflector (LFR) systems are more effective due to their simplicity of operation and low fabrication cost. A mathematical model and the simulation of a CPVT system employing a linear configuration and horizontal absorber is developed here in order to evaluate its performance parameters, using a FORTRAN programing technique. The concentrator system consists of, different width of flat glass mirrors placed under various inclination angles, focusing sunlight on to the PV solar cells mounted along the active cooling system. The effect of focus distance on concentration ratio, collector width, and heat gained by the coolant fluid are investigated. All parameters of the linear Fresnel reflector solar concentrator system are determined and the effect of cooling mass flow rate and cooling inlet temperature upon the system performance is evaluated. With regards to simulation results obtained via the focus distances, the width of mirrors decreased by increasing the number of mirrors, and in turn by increasing the focus distances, this resulted in an increase in CR values. For the specific number of mirrors, concentration ratio increased simultaneously increasing the focus distance; furthermore, increasing the number of mirrors resulted in a reduction in both the width of the mirrors and their inclination angles, and an increase in CR values. The results further confirmed that the total (combined electrical-thermal) efficiency is higher than that of the individual electrical as well as thermal efficiency; reaching approximately 80% and showed no sensitivity to the rises in cooling water temperature for temperature cases under consideration.

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Abdulhadi, M. Issa. "A Tubeless V-Trough Solar Concentrator." Transactions of the Canadian Society for Mechanical Engineering 10, no. 3 (September 1986): 135–40. http://dx.doi.org/10.1139/tcsme-1986-0016.

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An analytical, experimental investigation of the thermal performance of a tubeless V-trough concentrator has been carried out. Considering the energy balance on the receiver plate, a mathematical expression is developed from which the receiver plate mean temperature can be evaluated for each time interval. The good agreement between the experimental results and the analytical predictions indicate that the construction of a tubeless absorber panel might be valuable and the analytical approach might have the potential for further extensions. It has been found, according to the expermental investigation, that the fluid outlet temperatures vary between 69°C and 91 °C from 10:30 a.m. on up to the termination of operation in the late afternoon. This qualifies the V-trough to be a reliable source for providing temperatures in this range that can be utilized in heating and cooling applications.

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Kant, Karunesh, Karthik Nithyanandam, and Ranga Pitchumani. "Analysis and Optimization of a Novel Hexagonal Waveguide Concentrator for Solar Thermal Applications." Energies 14, no. 8 (April 12, 2021): 2146. http://dx.doi.org/10.3390/en14082146.

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This paper analyzes a novel, cost-effective planar waveguide solar concentrator design that is inspired by cellular hexagonal structures in nature with the benefits of facile installation and low operation and maintenance cost. A coupled thermal and optical analysis of solar irradiation through an ideal hexagonal waveguide concentrator integrated with a linear receiver is presented, along with a cost analysis methodology, to establish the upper limit of performance. The techno-economic model, coupled with numerical optimization, is used to determine designs that maximized power density and minimized the cost of heat in the temperature range of 100–250 °C, which constitutes more than half of the industrial process heat demand. Depending on the incident solar irradiation and the application temperature, the cost of heat for the optimal design configuration ranged between 0.1–0.27 $/W and 0.075–0.18 $/W for waveguide made of ZK7 glass and polycarbonate, respectively. A techno-economic analysis showed the potential of the technology to achieve cost as low as 80 $/m2 and 61 $/m2 for waveguide made of ZK7 glass and polycarbonate material, respectively, which is less than half the cost of state-of-the-art parabolic trough concentrators. Overall, the hexagonal waveguide solar concentrator technology shows immense potential for decarbonizing the industrial process heat and thermal desalination sectors.

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H. Ahmed, Mohamed, Alberto Giaconia, and Amr M. A. Amin. "Mathematical Modelling for the Thermal Performance of a Solar Parabolic Trough Concentrator (PTC) Under Egypt Climate." International Journal of Thermal and Environmental Engineering 17, no. 1 (December 1, 2018): 51–58. http://dx.doi.org/10.5383/ijtee.17.01.006.

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A. B, BANDE, GARBA M. M, ALIYU S, HAMZA B.S, and SHEHU A. "PERFORMANCE EVALUATION OF PARABOLIC CONCENTRATOR WITH THERMAL STORAGE SYSTEM FOR DOMESTIC APPLICATIONS." BIMA JOURNAL OF SCIENCE AND TECHNOLOGY (2536-6041) 6, no. 01 (April 30, 2022): 29–40. http://dx.doi.org/10.56892/bimajst.v6i01.311.

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Solar energy is a free natural resource but its harvesting requires a high capital investment whichprohibits its maximum exploitation. A Parabolic Dish Solar Collector (PDSC) with a thermalstorage system was been constructed and developed to harness solar beam radiation. The thermalstorage system and PDSC were constructed using locally and less cost materials such asgalvanized metal sheet and steel rods curved to obey the equation of a parabola then weldedtogether with circular support rings which was then lined with stainless steel reflector pasted forthe construction of PDSC. The receiver was made of blackened aluminium material incorporatedwith coiled copper tube carrying water as the heat transfer fluid. A parabolic dish which acts of aheat collector is used to track and reflects solar radiation at a single point (focus) on a receiverabsorber. Heat transfer from the solar collector to the storage tank was done by usingthermosyphonic principle to circulate the water (heat transfer fluid) between storage tank andheating system (receiver). The evaluation of thermal storage and analyzing the efficiency oftracking and non-tracking parabolic dish solar collector was carried out during month of June,2020 for the composite climate of Sokoto. According to the finding, the efficiency of trackingPDSC with thermal storage system and non- tracking PDSC with thermal storage tank weredetermined and obtained to be 52.9% and 50% respectively.Keywords: thermal efficiency, parabolic dish collector, solar radiation, storage system andstainless steel reflector.

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Sangotayo, Emmanuel Olayimika, Goodness Temitayo Opatola, Azeez Abdulraheem, and Taye Adeyemo. "Exergetic Analysis of a Parabolic Trough Solar Collector Water Heater." European Journal of Engineering and Technology Research 7, no. 1 (January 18, 2022): 31–36. http://dx.doi.org/10.24018/ej-eng.2022.7.1.2696.

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Heat exchange mechanisms involved in the conversion of solar energy to heat were determined using a parabolic trough collector. This study's goal is to examine the impact of operational and environmental factors on the energetic, performance of three different Parabolic Trough Collector receivers used to generate hot water. The collectors used uncoated, grey, and black receiver tubes. The parabolic trough concentrator is built of mild steel as the mainframe support with a segmented mirror reflector. Reflectivity is 0.85, rim angle is 90, an aperture area is 2.42 m2, and concentration ratio is 11.7. The parabolic trough concentrator's focal point has galvanized iron receiving tubes. The receiver tubes were fitted individually via the parabolic reflector's focal point. The thermal exergy of each absorber tube was determined while water flowed at 0.003 kg/s. During the investigation, solar radiation, and water temperatures at the absorber tube's input and outflow were all measured. The results show that both the temperature of the heat transfer fluid and the amount of solar radiation have a substantial effect on thermal energetic performance. This concentrator reduces dependency on electric power while minimizing fossil-fuel emissions, reducing pollution.

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Sangotayo, Emmanuel Olayimika, Goodness Temitayo Opatola, Azeez Abdulraheem, and Taye Adeyemo. "Exergetic Analysis of a Parabolic Trough Solar Collector Water Heater." European Journal of Engineering and Technology Research 7, no. 1 (January 18, 2022): 31–36. http://dx.doi.org/10.24018/ejeng.2022.7.1.2696.

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Heat exchange mechanisms involved in the conversion of solar energy to heat were determined using a parabolic trough collector. This study's goal is to examine the impact of operational and environmental factors on the energetic, performance of three different Parabolic Trough Collector receivers used to generate hot water. The collectors used uncoated, grey, and black receiver tubes. The parabolic trough concentrator is built of mild steel as the mainframe support with a segmented mirror reflector. Reflectivity is 0.85, rim angle is 90, an aperture area is 2.42 m2, and concentration ratio is 11.7. The parabolic trough concentrator's focal point has galvanized iron receiving tubes. The receiver tubes were fitted individually via the parabolic reflector's focal point. The thermal exergy of each absorber tube was determined while water flowed at 0.003 kg/s. During the investigation, solar radiation, and water temperatures at the absorber tube's input and outflow were all measured. The results show that both the temperature of the heat transfer fluid and the amount of solar radiation have a substantial effect on thermal energetic performance. This concentrator reduces dependency on electric power while minimizing fossil-fuel emissions, reducing pollution.

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Jin, Hongguang, Jun Sui, Hui Hong, Zhifeng Wang, Danxing Zheng, and Zhi Hou. "Prototype of Middle-Temperature Solar Receiver/Reactor With Parabolic Trough Concentrator." Journal of Solar Energy Engineering 129, no. 4 (June 6, 2007): 378–81. http://dx.doi.org/10.1115/1.2769698.

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This paper manufactured an original middle-temperature solar receiver/reactor prototype, positioned along the focal line of one-axis parabolic trough concentrator, representing the development of a new kind of solar thermochemical technology. A 5kW prototype solar reactor at around 200–300°C, which is combined with a linear receiver, was originally manufactured. A basic principle of the design of the middle-temperature solar reactor is identified and described. A representative experiment of solar-driven methanol decomposition was carried out. Experimental tests were conducted from 200°C to 300°C under mean solar flux of 300–800W∕m2 and at a given methanol feeding rate of 2.1L∕h. The conversion of methanol decomposition yielded up to 50–95%, and the efficiency of solar thermal energy conversion to chemical energy reached 30–60%. The experimental results obtained here prove that the novel solar receiver/reactor prototype introduced in this paper can provide a promising approach to effectively utilize middle-temperature solar thermal energy by means of solar thermochemical processes.

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Nithyanandam, K., A. Narayan, and R. Pitchumani. "Analysis and design of a radial waveguide concentrator for concentrated solar thermal applications." Energy 151 (May 2018): 940–53. http://dx.doi.org/10.1016/j.energy.2018.03.015.

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Stine, W. B., and A. A. Heckes. "Energy and Availability Transport Losses in a Point-Focus Solar Concentrator Field." Journal of Solar Energy Engineering 109, no. 3 (August 1, 1987): 205–9. http://dx.doi.org/10.1115/1.3268207.

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This paper presents the results of an experimental study of the losses in transporting thermal energy from a field of 114 point-focus solar collectors to a central thermal energy conversion system at the Solar Total Energy Project (STEP), Shenandoah, Georgia. Conduction and convection heat losses from the collector field piping and solar collector receivers and radiant energy losses from the solar collector receivers were measured. At normal operating conditions the steady state heat losses per unit of collector aperture area are 130 W/m2 (41 Btu/hr-ft2). The thermal mass of the collector field was found to be 3.92 kWh/°C (7,440 Btu/°F), which implies that 17 percent of the energy collected on a typical day is used to warm the field piping to its operating temperature. The loss of availability from the collectors and the field piping shows that only 21 percent of the available solar energy falling on the collector field is delivered to the power cycle for conversion into electricity.

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Chávez-Bermúdez, Irving A., Norma A. Rodríguez-Muñoz, Eduardo Venegas-Reyes, Loreto Valenzuela, and Naghelli Ortega-Avila. "Thermal Performance Analysis of a Double-Pass Solar Air Collector: A CFD Approach." Applied Sciences 12, no. 23 (November 29, 2022): 12199. http://dx.doi.org/10.3390/app122312199.

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Solar air heaters can reduce climate change by replacing conventional fossil fuel-burning technologies in drying and space heating applications. Concentrating solar technologies, such as compound parabolic concentrators, allow air temperatures up to 120 °C; however, it is desirable to improve their heat transfer to reduce the space requirements for their installation. In this work, a parabolic concentrator composed of a flat receiver designed to recover heat from the cover–receiver–reflectors cavity is analyzed, operating it as a U-shape double pass solar heater. With this operation, first, the air flows through the cavity, and then it is incorporated into the duct, where the dominant heat gain occurs due to the capture of solar radiation. Thus, four input–output configurations in the cavity were modeled through dynamic simulations to determine the influence of the inlet and outlet air flow positions on the solar concentrator outlet temperature. Therefore, the incorporation of the first pass has a contribution of between 36% and 45% in useful energy gain, showing that this appropriate and relatively simple strategy can be implemented to improve the thermal performance of solar air collectors, resulting in instantaneous efficiencies higher than 75%. However, the simulation results demonstrate that the position of the inlets and outlets does not significantly impact the efficiency and outlet temperature.

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Hariri, Nasir Ghazi, Kamal Mohamed Nayel, Emad Khalid Alyoubi, Ibrahim Khalil Almadani, Ibrahim Sufian Osman, and Badr Ahmed Al-Qahtani. "Thermal–Optical Evaluation of an Optimized Trough Solar Concentrator for an Advanced Solar-Tracking Application Using Shape Memory Alloy." Materials 15, no. 20 (October 13, 2022): 7110. http://dx.doi.org/10.3390/ma15207110.

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One of the modern methods for enhancing the efficiency of photovoltaic (PV) systems is implementing a solar tracking mechanism in order to redirect PV modules toward the sun throughout the day. However, the use of solar trackers increases the system’s electrical consumption, hindering its net generated energy. In this study, a novel self-tracking solar-driven PV system is proposed. The smart solar-driven thermomechanical actuator takes advantage of a solar heat collector (SHC) device, in the form of a parabolic trough solar concentrator (PTC), and smart shape memory alloy (SMA) to produce effective mechanical energy for solar tracking applications from sun rays. Furthermore, a thermal–optical analysis is presented to evaluate the performance of the solar concentrator for the simulated weather condition of Dammam City, Saudi Arabia. The numerical results of the thermal and optical analyses show the promising feasibility of the proposed system in which SMA springs with an activation temperature between 31.09 °C and 45.15 °C can be utilized for the self-tracking operations. The work presented adds to the body of knowledge an advanced SMA-based SHC device for solar-based self-actuation systems, which enables further expansions within modern and advanced solar thermal applications.

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Xuan, Qingdong, Guiqiang Li, Yashun Lu, Xudong Zhao, Yuehong Su, Jie Ji, and Gang Pei. "A general optimization strategy for the annual performance enhancement of a solar concentrating system incorporated in the south-facing wall of a building." Indoor and Built Environment 29, no. 10 (September 29, 2019): 1386–98. http://dx.doi.org/10.1177/1420326x19878217.

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A solar concentrating system incorporated to the south-facing wall could be a promising solution to alleviate the energy demand pressure in buildings. However, concentrating systems incorporated in south-facing walls would require wide acceptance range of concentrators with the purpose of static installation. In order to tackle this problem, this article proposes a novel unitary asymmetric concentrator structure for incorporating the concentrating system in the south-facing wall. A general optimization strategy for the annual performance enhancement of the concentrator is reported. Four kinds of concentrators were designed based on the proposed structure. The annual performance enhancement by this optimization strategy was analysed and compared through the ray-tracing simulation and experimental validation for four typical types of solar concentrators, i.e. Mirror Concentrator, Lens-Mirror Concentrator, Dielectric Concentrator and Air-Gap-Lens-Mirror Concentrator. The optical performance of these concentrators was studied and compared. Their application was analysed and validated through the analysis. The findings have illustrated the optical efficiency of the concentrators for concentrating the photovoltaics or photovoltaic-thermal system incorporated to the south-facing wall either by attachment or embedded into a building structure like a window. These concentrators can be engineered as the main component as a part of the design for a building.

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Mohammed, Mokhtar, and Taha Janan Mourad. "Theoretical Analysis of a New Design of a Concentration Based Solar Distiller." E3S Web of Conferences 234 (2021): 00003. http://dx.doi.org/10.1051/e3sconf/202123400003.

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This paper includes a theoretical study of energy balance for all parts of new design of solar concentration distiller using a parabolic concentrator with a half-cylinder basin. Our goal is to analyze the thermal efficiency of the new device to use in the Morocco's Rabat-Sale-Kenitra region. The methodology concentrates on solving the thermal collector's energy balance equations whose components are the glass cover, the brackish water and half-cylinder absorber. Numerical resolution of the energy balance equations was performed using a MATLAB code based on the method of 4th order Runge-Kutta. The results show a good theoretical performance of the new device.

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Llamos Tulumba, Luis Miguel, Raúl Yamil Hidalgo Sandoval, Hugo Diaz Avalos, and Hugo Guillermo Diaz Panduro. "Diseño y construcción de un secador solar para el secado de madera de baja densidad." Revista Investigación Universitaria 11, no. 1 (June 30, 2021): 483–501. http://dx.doi.org/10.53470/riu.v11i1.12.

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The purpose of this research was to demonstrate that the use of residual oil as a heat transport fluid and the use of rice husk as a thermal insulator is an efficient alternative for the greater use of solar energy. For this, a prototype of a solar dryer was designed and built consisting of a flat solar thermal concentrator and a parabolic cylindrical thermal concentrator (CCP), this was validated by drying Guazuma crinita, Mart. (White ball) and monitored by a contact hygrometer. Five tests were carried out, the first test was considered as a control, in which heat transport fluid and thermal insulators were not used, and in the following four tests two types of heat transport fluids were combined (residual motor oil and brine) and two types of thermal insulators (wood sawdust and rice husk), obtaining as a result that the most efficient test was number three, consisting of residual motor oil as heat transport fluid and rice husk as thermal insulator. With the most efficient test, the prototype was validated by drying low-density wood, reducing the humidity of the wood from 45.8% to 12.3% in ten sunny days.

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A., Rusul F., and Alaa B. H. "Efficiency Evaluation of Solar Concentrator without Tracking System Type of Compound Parabolic Concentrator (CPC)." Ibn AL- Haitham Journal For Pure and Applied Sciences 34, no. 2 (April 20, 2021): 9–22. http://dx.doi.org/10.30526/34.2.2609.

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It is useful to analyze any optical system theoretically before proceeding with its design in order to ensure the effectiveness of the design through computer simulations that are important and useful in designs for the ability to predict the performance of solar concentrator under any conditions. For this design, non-sequential ray tracing mode wasused in the Zimax program with a light source that simulated solar radiation. The purpose of the design of a compound parabolic concentrator (CPC) is to take advantage of the solar radiation that falls on it without the need for an efficiently tracked system within certain limits of the angle of solar radiation fall known as the acceptance angle. That is, obtaining the largest possible number of rays received inside the CPC through reflections in the inner walls of it, which give a large amount of thermal energy to the surface of the recipient, which in turn gets this energy to be used to create electrical energy. The efficiency of receiving reflected solar radiation in this type of concentrator is great compared to other solar concentrators. Simulated design of solar reflector concentrator has been presented. The concentrator is a type of compound parabolic concentrator (CPC) involved of internal reflector surface (Hollow and within Poly methyl methacrylate (PMMA) polymer material) without tracking system. CPC has the property to overcome problems result from variation of incidence angle of the sun during daytime. Because the tracking system expensive and has technical problems. The efficiency of CPC has been obtained by using Zemax optical design program, for different designs has concentration ratio(c=1,2,3,4,5). That is, the ratio of the output aperture to the input aperture. Taking into account the angle of acceptance that plays a major role in the form of design and its efficiency the results are shown when designing the model with radial aperture of (50mm) and length of (500mm).The design of concentrations ratio is depends on the acceptance angle. c=5 at normal incident angle (ÆŸ=0). And it is almost similar if the material is used PMMA within CPC, and degradation of efficiency with increasing the incidence angle.

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Ahmed, Mohamed H., and Amr M. A. Amin. "Thermal Analysis of the Performance of Linear Fresnel Solar Concentrator." Journal of Clean Energy Technologies 4, no. 5 (2015): 316–20. http://dx.doi.org/10.18178/jocet.2016.4.5.304.

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Journal articles on the topic 'Solar thermal concentrator'

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