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http://dx.doi.org/10.3795/KSME-B.2011.35.12.1383

Numerical Analysis of Heat Transfer in Multichannel Volumetric Solar Receivers  

Lee, Hyun-Jin (Solar Thermal and Geothermal Center, Korea Institute of Energy Research)
Kim, Jong-Kyu (Solar Thermal and Geothermal Center, Korea Institute of Energy Research)
Lee, Sang-Nam (Solar Thermal and Geothermal Center, Korea Institute of Energy Research)
Kang, Yong-Heack (Solar Thermal and Geothermal Center, Korea Institute of Energy Research)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.35, no.12, 2011 , pp. 1383-1389 More about this Journal
Abstract
The current study focuses on the consistent analysis of heat transfer in multichannel volumetric solar receivers used for concentrating solar power. Changes in the properties of the absorbing material and channel dimensions are considered in an optical model based on the Monte Carlo ray-tracing method and in a one-dimensional heat transfer model that includes conduction, convection, and radiation. The optical model results show that most of the solar radiation energy is absorbed within a very small channel length of around 15 mm because of the large length-to-radius ratio. Classification of radiation losses reveals that at low absorptivity, increased reflection losses cause reduction of the receiver efficiency, notwithstanding the decrease in the emission loss. As the average temperature increases because of the large channel radius or small mass flow rate, both emission and reflection losses increase but the effect of emission losses prevails.
Keywords
Volumetric Solar Receiver; Concentrated Solar Flux; Monte Carlo Ray-Tracing Method;
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Times Cited By KSCI : 3  (Citation Analysis)
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