Experimental and theoretical analyses of a double-cylindrical trough solar concentrator
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DOI 10.1007/s12206-020-1041-3
Journal of Mechanical Science and Technology 34 (11) 2020 Original Article DOI 10.1007/s12206-020-1041-3 Keywords: · Solar energy · Fresnel collector · Cylindrical-parabolic collector · Steam · Hot water
Correspondence to: Cuma Çetiner [email protected]
Citation: Çetiner, C. (2020). Experimental and theoretical analyses of a doublecylindrical trough solar concentrator. Journal of Mechanical Science and Technology 34 (11) (2020) 4857~4863. http://doi.org/10.1007/s12206-020-1041-3
Received April 30th, 2020 Revised
August 3rd, 2020
Accepted August 6th, 2020 † Recommended by Editor Yong Tae Kang
© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Experimental and theoretical analyses of a double-cylindrical trough solar concentrator Cuma Çetiner Department of Mechanical Engineering, Faculty of Engineering, Harran University, Şanlıurfa, Turkey
Abstract
Parabolic trough, Fresnel, heliostat mirror, or dish-type collectors are used to obtain high temperature in solar thermal applications. The operation of this system is similar to that of a Fresnel collector, except for its reflective mirror, which is cylindrical and not flat. The experiments were carried out in the solar energy system manufactured for producing hot water, superheated water, and steam in the cylindrical trough solar concentrator. According to the test results, the thermal power of the system and the average thermal efficiency of the collector were a maximum of 15 kW and approximately 35 %, respectively.
1. Introduction Studies on solar energy applications and technologies have been increasing rapidly in recent years. The use of flat-plate type collectors is enough to meet the demand for hot water, which is a type of solar energy with low thermal temperature [1, 2]. However, the use of concentrating collectors is necessary for high-temperature applications obtained from solar energy in the industry [3, 4]. Parabolic trough collector system, linear Fresnel collector (LFC), central tower concentrating solar power, and parabolic dish concentrator are used in high-temperature applications. These collectors collect the sun's rays in a linear or point focus. The temperature can be increased to up to 150 °C-500 °C in linear concentration [5-7] and 1400 °C in point concentration in focusing collectors depending on their geometric shapes [8, 9]. Central-receiver and dish collectors are used at high-temperature applications. Parabolic trough and LFC are used on commercial and industrial scales for medium-temperature applications [10]. Fresnel collectors are used for focusing on solar radiation through a series of flat, long, and parallel mirrors. The rays reflected from the flat mirrors are transferred to the liquid that circulates in the absorber in the focus of the system. The receiver in the focus of the Fresnel collectors is a flat or a compound absorber that reflects radiation the second time [11, 12]. With LFC, many studies, including the LFC prototype made by Sola
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