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A Fast View-factor Model on Reflection Loss Calculation of Cavity Receiver.pdf

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A Fast View-factor Model on Reflection Loss Calculation of Cavity Receiver.pdf

Available online at ScienceDirect Energy Procedia 69 (2015) 593 – 599 International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2014 A fast view-factor model on reflection loss calculation of cavity receiver Q.Q. Zhanga,*, X. Lia, , C. Changa, Z.R. Liaoa, Z.F. Wanga, Q. Yua aKey Laboratory of Solar Thermal Energy and Photovoltatic System, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing, 100190, China Abstract The reflection energy loss of a cavity receiver is complicated due to the structure of multi-surface inside the cavity. Based on the assumption of semi-gray diffuse reflection, a fast model is proposed to solve the problem. During the calculation, each panel is treated as a semi-gray diffuse reflecting surface. The solar radiation energy transfer between different surfaces is also considered. The fast model is then used to calculate the reflection energy loss of a molten salt cavity receiver with known view factors. The result is compared with values calculated through other models, and the fast model is proved effective to calculate the reflection energy loss of cavity receivers. ??TThheeAAuuthtohrosr.sP.uPbulibslhiesdhebdy bEylseEvliseervLietdr.LTthdi.s is an open access article under the CC BY-NC-ND license P(hetetpr:r//ecvrieeawtivbecyotmhme oscnise.onrtgif/liiccecnosnefse/breyn-ncce-ncdo/m4.0m/)i.ttee of SolarPACES 2014 under responsibility of PSE AG. Peer review by the scientific conference committee of SolarPACES 2014 under responsibility of PSE AG Keywords: Cavity; Receiver; Reflection; view factor; Nomenclature Qref reflection energy loss (W) ? reflectivity Qin incident solar power (W) Aape aperture area (m2) Ar receiver surface area (m2) * Corresponding author. Tel.: +86 10 fax: +86 10 E-mail address: zqq_different@126.com 1876-6102 ? 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (/licenses/by-nc-nd/4