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Performance of Thermoelectric Based Regenerative Adsorption Cooling System for Harsh Environment

[+] Author Affiliations
Ashish Sinha, Yogendra Joshi

Georgia Institute of Technology, Atlanta, GA

Paper No. IMECE2009-12655, pp. 1415-1428; 14 pages
doi:10.1115/IMECE2009-12655
From:
  • ASME 2009 International Mechanical Engineering Congress and Exposition
  • Volume 9: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B and C
  • Lake Buena Vista, Florida, USA, November 13–19, 2009
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4382-6 | eISBN: 978-0-7918-3863-1
  • Copyright © 2009 by ASME

abstract

Performance of a cooling system designed for thermal management of harsh environment electronics has been presented. The system is based on regenerative adsorption-desorption cycle and mainly comprises of two beds with zeolite-water as adsorbent-adsorbate pair, a condenser and an evaporator. Heat regeneration was achieved by a thermoelectric (TE) device placed in between the zeolite beds. Use of a thermoelectric device for heat transfer in between beds allows for miniaturization of usually bulky adsorption cooling systems. This also provides a cooling system with nearly no moving parts, hence suitable for harsh environment electronic cooling applications. Zeolite beds alternately carry out adsorption and desorption depending on the direction of heat flow in between them. Direction of heat flow is governed by the polarity of voltage applied across the TE device. Polarity is switched at fixed time intervals that determine the cycle time. Tests were carried out during which the condenser temperature hovered around 165 °C, heat load was up to 5W, the cycle time kept close to 12 minutes and the targeted evaporator temperature was 140 °C. System was analyzed in terms of the extent of cooling below the heat rejection ambient temperature of 160 °C and coefficient of performance. A COP of 0.2 was obtained. The study could be used to extend the working envelopes of existing electronics towards hotter surroundings. A mathematical model was also prepared and the experimental results have been compared with the simulations.

Copyright © 2009 by ASME
Topics: Cooling systems

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