The present study presents an experimental study of a prototype counter-flow heat exchanger designed to recover sensible heat from inert and reactive gases flowing through a high temperature solar reactor for splitting CO2. The tube-in-tube heat exchanger is comprised of two concentric alumina tubes, each filled with reticulated porous alumina with a nominal porosity of 80% and pore density of 5 pores per inch (ppi). The RPC provides high heat transfer surface area per unit volume (917 m-1) with low pressure drop. Measurements include the permeability, inertial coefficient, overall heat transfer coefficient, effectiveness and pressure drop. For laminar flow and an inlet gas temperature of 1240 K, the overall heat transfer coefficients are 36-41 W m-2 K-1. The measured performance is in good agreement with a prior CFD model of the heat exchanger.
|Original language||English (US)|
|Number of pages||7|
|Journal||Applied Thermal Engineering|
|State||Published - Jan 22 2015|
Bibliographical noteFunding Information:
The financial support by the U.S. Department of Energy's Advanced Research Projects Agency –Energy (award no. DE-AR0000182) to the University of Minnesota, the University of Minnesota Initiative for Renewable Energy and the Environment (grant no. RM-0001-12 ) is gratefully acknowledged. The authors acknowledge contributions of Mr. Rudy Olson and his staff at Selee Corporation, Hendersonville, NC in fabrication of the heat exchanger prototype and Professor Thomas Chase and Mr. Stephen Sedler for preparing Fig. 1 and mechanical design of the heat exchanger and assembly to the reactor.
© 2014 Elsevier Ltd. All rights reserved.
- Heat exchanger
- High temperature
- Reticulated porous ceramic