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An Experimental Study on the Natural Convection Heat Transfer of Air-cooling PEMFC in a Enclosure

밀폐된 공간 내 공랭식 PEMFC의 자연대류 열전달에 대한 실험적 연구

LEE, JUNSIK;KIM, SEUNGGON;SOHN, YOUNGJUN
이준식;김승곤;손영준

  • Received : 2015.11.30
  • Accepted : 2016.02.28
  • Published : 2016.02.29

Abstract

This study presents an experiment investigation on natural convection heat transfer of air-cooling Proton exchange membrane fuel cells (PEMFCs) in a enclosure system for unmanned aerial vehicles (UAVs). Considered are replacing fuel cell stack with Aluminum block for heat generating inside a enclosure chamber. The volume ratio of fuel cell stack and chamber for simulation to the actual size of aerial vehicle is 1 to 15. The parameters considered for experimental study are the environmental temperature range from $25^{\circ}C$ to $-60^{\circ}C$ and the block heat input of 10 W, 20 W and 30 W. Effect of the thermal conductivity of the block and power level on heat transfer in the chamber are investigated. Experimental results illustrate the temperature rise at various locations inside the chamber as dependent upon heat input of fuel cell stack and environmental temperature. From the results, dimensionless correlation in natural convection was proposed with Nusselt number and Rayleigh number for designing air-cooling PEMFC powered high altitude long endurance (HALE) UAV.

Keywords

Air-cooling;PEMFC;Natural convection;Nusselt number;Rayleigh number;UAV

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Acknowledgement

Supported by : 산업통상자원부