Circumferential Temperature Analysis of One Sided Thermally Insulated Parabolic Trough Receiver Using Computational Flui
Low temperature industrial thermal applications like process heating involving solar thermal technology renders the usage of inexpensive air filled annuli receivers despite they are below par in thermal performance. This work is cantered around the air fi
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Mechanical Engineering Department, Thapar University, Patiala 147004, Punjab, India [email protected], [email protected], [email protected] Department of Mechanical Engineering, Delhi Technological University, New Delhi 110042, India [email protected]
Abstract. Low temperature industrial thermal applications like process heating involving solar thermal technology renders the usage of inexpensive air filled annuli receivers despite they are below par in thermal performance. This work is cantered around the air filled receiver system and more importantly try to assess both conventional and modified air filled annulus system using computational fluid dynamics (CFD) in terms of their performance parameters. For modification purpose, conventional receiver was fitted with thermal insulation in non-concentrating half section of receiver which is actually short of concentrated sun’s radiation. Finally it was simulated for significantly reduced circumferential temperature distribution (CTD) around the absorber and was compared with conventional air filled annulus receiver. This comparison could be supposed to serve as a means of advancement for the development of small scale solar thermal based heat producing plants. Keywords: Parabolic trough collectors Computational fluid dynamics
Air filled annulus receiver
1 Introduction Linear concentration technology has taken concentrated solar power (CSP) by storm: there is no definitive focusing point, rather a line. Serious development and evolution of this technology, in fact, came into existence when researchers analyzed step by step and wrap by wrap, the existing forefront point focusing technology and suddenly stumbled upon a common notion―why, point concentrate the heat, when it will be redistributed anyways, in line circuitry of the heat transfer fluid. Parabolic trough based concentrated solar thermal power plants, for the most part consists of parabolic trough solar fields, heat generation system or absorber/receiver system, power block powered with Rankine steam turbine and a temporary or optional power storage system. © Springer Nature Singapore Pte Ltd. 2017 K. Deep et al. (eds.), Proceedings of Sixth International Conference on Soft Computing for Problem Solving, Advances in Intelligent Systems and Computing 547, DOI 10.1007/978-981-10-3325-4_12
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Y.P. Chandra et al.
As far as thermal performance of parabolic trough collector is concerned, thermo-physical parameters i.e. solar irradiance, wind velocity, mass flow rate and inlet temperature of heat transfer fluid (HTF) holds paramount importance. Presently, most eminent technology used in CSP is vacuumed annulus receiver. These receivers ensure curtailment of all the unfavourable convection losses which are quite a conspicuous problem in high temperature CSP applications. In addition, with regards to their high thermal performance, they are very expensive amounting to not less than 20% of cost of the whole solar parabolic trough collector (PTC) field. Furthermore, relatively inexpensive i.e. ai
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