Heat transfer model of a solardiZnO—Experimental validation at 10 kW and scale-up to 1 MW.pdf

Chemical Engineering Journal 150 (2009) 502–508 Contents lists available at ScienceDirect Chemical Engineering Journal j o u rn al h omepage: w w w. elsev /locate/cej Heat transfer model of a solar receiver-reactor for the thermal dissociation of ZnO—Experimental validation at 10 kW and scale-up to 1 MW L.O. Schunk a ´ b a,c,∗ , W. Lipinski , A. Steinfeld a Solar Technology Laboratory, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland b Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455, USA c Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland a r t i c l e i n f o a b s t r a c t Article history: A transient heat transfer model is developed for analyzing the thermal performance of a thermochemical Received 10 November 2008 reactor for the solar-driven dissociation of ZnO in the 1600–2136 K range. The reactor consists of a rotating Received in revised form 3 March 2009 cavity-receiver lined with ZnO particles that are directly exposed to concentrated solar radiation. The Accepted 4 March 2009 model couples radiation, convection, and conduction heat transfer to the reaction kinetics for a shrinking domain and simulates a transient ablation regime with semi-batch feed cycles of ZnO particles. Validation Keywords: is accomplished in terms of the numerically calculated and experimentally mea