Performance model of metallic concentric tube recuperator with counter flow arrangement |
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Authors: | Harshdeep Sharma Anoop Kumar Varun Goel |
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Institution: | (1) Department of Mechanical Engineering, HIET, Ghaziabad, Uttar Pradesh, India;(2) Department of Mechanical Engineering, NIT, Hamirpur, Himachal Pradesh, India |
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Abstract: | A performance model for counter flow arrangement in concentric tube recuperator that can be used to utilize the waste heat
in the temperature range of 900–1,400°C is presented. The arrangement consists of metallic tubular inner and outer concentric
shell with a small annular gap between two concentric shells. Flue gases pass through the inner shell while air passes through
the annular gap in the reverse direction (counter flow arrangement). The height of the recuperator is divided into elements
and an energy balance is performed on each elemental height. Results give necessary information about surface, gas and air
temperature distribution, and the influence of operating conditions on recuperator performance. The recuperative effectiveness
is found to be increased with increasing inlet gas temperature and decreased with increasing fuel flow rate. The present model
accounts for all heat transfer processes pertinent to a counterflow radiation recuperator and provide a valuable tool for
performance considerations. |
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