Journal
APPLIED THERMAL ENGINEERING
Volume 28, Issue 5-6, Pages 524-531Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2007.05.002
Keywords
solar; heat transfer; transient; radiation; zinc; zinc oxide; hydrogen; thermochemical cycle; solar reactor
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A numerical and experimental investigation is carried out in a solar thermochemical reactor for the thermal dissociation of ZnO at 2000 K using concentrated solar energy. The reactor consists of a cavity-receiver lined with ZnO particles and directly exposed to high-flux irradiation. A transient heat transfer model is formulated to link the rate of radiation, convection, and conduction heat transfer to the reaction kinetics. The radiosity and Monte Carlo methods are applied to obtain the distribution of net radiative fluxes at the internal surfaces of the reactor cavity and at the surface of the ZnO bed. Validation is accomplished in terms of the calculated and measured transient temperature profiles and chemical reaction rates.(C) 2007 Elsevier Ltd. All rights reserved.
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