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A Detailed Radiation Heat Transfer Study of a Dish-Stirling Receiver: the Impact of Cavity Wall Radiation Properties and Cavity Shapes
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology. (Solar group)ORCID iD: 0000-0003-1792-0551
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology. (Solar Group)
Cleanergy Company.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology. (Solar Group)
2015 (English)In: SOLARPACES 2015: INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS / [ed] Rajpaul, V; Richter, C, American Institute of Physics (AIP), 2015Conference paper (Refereed)
Abstract [en]

A detailed 3-D radiation analysis of a dish-Stirling cavity receiver is carried out to estimate the cavity steady-state temperatures in order to assess the receiver integrity, lifetime and efficiency performance. For this purpose, a parabolic dish was modeled with 5.2 m focal length, 8.84 m aperture diameter and 2.1 mrad typical surface error. Three generic cavity shapes (cylindrical, diamond-shaped and reverse-conical) with three different emissivities (0.2, 0.4 and 0.7) are studied. Worst-case scenario heat generations (total absorbed radiation), maximum steady-state temperatures and energy balances of the cavities are calculated to evaluate the receiver performance. The results show that reverse-conical cavities can significantly reduce cavity wall peak temperatures (by 40-120 K), improve the temperature evenness and decrease the radiation losses by 4-5%. Regarding radiation properties, low reflectivities present lower steady-state temperatures even for low/moderate direct solar fluxes. Due to the lower temperatures, lower total thermal losses are also expected.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2015.
Series
, AIP Conference Proceedings, ISSN 0094-243X ; 1734
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-183000DOI: 10.1063/1.4949069ISI: 000380374600045ISBN: 978-0-7354-1386-3OAI: oai:DiVA.org:kth-183000DiVA: diva2:906415
Conference
21st International Conference on Concentrating Solar Power and Chemical Energy Systems (SolarPACES), Cape Town, SOUTH AFRICA, OCT 13-16, 2015
Note

QC 20160823

Available from: 2016-02-24 Created: 2016-02-24 Last updated: 2016-08-23Bibliographically approved

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