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CFD analysis based parametric study of derating factor for Earth Air Tunnel Heat Exchanger

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  • Misra, Rohit
  • Bansal, Vikas
  • Agrawal, Ghanshyam Das
  • Mathur, Jyotirmay
  • Aseri, Tarun K.

Abstract

Thermal performance of Earth Air Tunnel Heat Exchanger (EATHE) under transient operating conditions has been evaluated for predominantly hot and dry climate of Ajmer (India) using experimental and Computational Fluid Dynamics modeling. Effects of time duration of continuous operation, thermal conductivity of soil pipe diameter and flow velocity on thermal performance of EATHE under transient conditions have been analyzed. Results show that the transient thermal performance of EATHE is significantly dependent on thermal conductivity of the soil and duration of its continuous operation. The analyzed cases have shown the range of derating to be as minimal as 0% to as high as 64%, which if ignored while designing may lead to poor performance of EATHE. Study reveals that the effect of pipe diameter due to prolonged use of EATHE system on its thermal performance is least in case of soil with higher value of thermal conductivity. Results show that the increase in flow velocity leads to deterioration in thermal performance of EATHE system. Under steady state condition, drop of 18.8°C in air temperature is obtained, whereas, under transient conditions cooling of air reduces from 18.7°C to 16.6°C for soil thermal conductivity of 0.52Wm−1K−1, after 24h of continuous operation.

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  • Misra, Rohit & Bansal, Vikas & Agrawal, Ghanshyam Das & Mathur, Jyotirmay & Aseri, Tarun K., 2013. "CFD analysis based parametric study of derating factor for Earth Air Tunnel Heat Exchanger," Applied Energy, Elsevier, vol. 103(C), pages 266-277.
    • Handle: RePEc:eee:appene:v:103:y:2013:i:c:p:266-277
    DOI: 10.1016/j.apenergy.2012.09.041
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