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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

CONJUGATED RADIATION-CONVECTION-CONDUCTION HEAT TRANSFER ANALYSIS OF VOLUMETRIC RECEIVER WITH HIGHLY CONCENTRATED RADIATION

Mitsuho Nakakura
Faculty of Engineering, Niigata University, Ikarashi 2-no cho 8050, Nishi-ku, Niigata 9502181, Japan; Research Fellowship for Young Scientists, Japan Society for the Promotion of Science, Kojimachi Business Center Building, Kojimachi 5-3-1, Chiyoda-ku, Tokyo 1020083, Japan

Selvan Bellan
Center of Transdisciplinary Research, Niigata University, Ikarashi 2-no cho 8050, Nishi-ku, Niigata 9502181, Japan; Pacific Rim Solar Fuel System Research Center, Niigata University, Ikarashi 2-no cho 8050, Nishi-ku, Niigata 950-2181, Japan

Hyun-Seok Cho
Center of Transdisciplinary Research, Niigata University, Ikarashi 2-no cho 8050, Nishi-ku, Niigata 9502181, Japan; Pacific Rim Solar Fuels Research Center, Niigata University, 8050 Ikarashi 2-nocho, Niigata 950-2181, Japan

Koji Matsubara
Faculty of Engineering, Niigata University: Professor, Doctor of Engineering, Ikarashi 2-no cho 8050, Nishi-ku, Niigata 950-2181, Japan; Pacific Rim Solar Fuel System Research Center, Niigata University, Ikarashi 2-no cho 8050, Nishi-ku, Niigata 950-2181, Japan

Nobuyuki Gokon
Center of Transdisciplinary Research, Niigata University, Ikarashi 2-no cho 8050, Nishi-ku, Niigata 9502181, Japan; Pacific Rim Solar Fuel System Research Center, Niigata University, Ikarashi 2-no cho 8050, Nishi-ku, Niigata 950-2181, Japan

Tatsuya Kodama
Faculty of Engineering, Niigata University: Professor, Doctor of Engineering, Ikarashi 2-no cho 8050, Nishi-ku, Niigata 950-2181, Japan; Pacific Rim Solar Fuel System Research Center, Niigata University, Ikarashi 2-no cho 8050, Nishi-ku, Niigata 950-2181, Japan

DOI: 10.1615/IHTC16.nee.023436
pages 7866-7873


KEY WORDS: Conjucated radiation-convection-conduction, Two way coupling numerical simulation, Solar receiver

Abstract

This study focuses on the conjugate radiation-convection-conduction heat-transfer problem for a square channel of volumetric solar receiver with concentrated irradiation for Concentrated Solar Power (CSP). A single channel of a honeycomb receiver is directly irradiated from the outside, via a transparent wall. Atmospheric air flows through the channel and absorbs the sensible heat. Governing equations are continuity, Navier-Stokes and energy equations for solid/fluid region, and radiative transfer equation. Radiation was solved by the Discrete Ordinates (DO) model. The effects of the number of mesh grids and direction vectors on the DO model were confirmed to be negligible. This study analyzed the heat-transfer performance of stainless-steel receivers with different channel geometry. Three different types and sizes of channels were treated; L-shaped cuts were made at the channel top. The heat transfer performance of these channels, i.e. bulk air temperature and pressure drop at the outlet were improved by the L-shape cutting. The wall heat flux difference between simple and cut channel was clarified by the contour plots of inner walls. Across the entire inner wall, the conduction heat flux contributed to the heating of the flowing air, while the radiation heat-flux dominated near the inlet due to high incident radiation. As a result, the wall heat-flux had characteristic profile along the channel depth (-z) direction. This study elucidates conjugate heat transfer mechanism in the honeycomb-like channel receivers with highly concentrated radiation.

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