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用相变材料进行手机瞬态热管理

Marc Hodes
e-mail:
hodes@lucent.com
Bell Laboratories,
Lucent Technologies,
Murray Hill, NJ 07974
Randy D. Weinstein
e-mail:
randy.weinstein@villanova.edu
Stephen J. Pence1
Jason M. Piccini2
Chemical Engineering Department,
Villanova University,
Villanova, PA 19085
Lou Manzione
e-mail:
ltm@lucent.com
Calvin Chen
e-mail:
calvinchen@lucent.com
Bell Laboratories,
Lucent Technologies,
Murray Hill, NJ 07974

The power density of portable electronic devices continues to increase because packaging
advances reduce their size even as features are added and enhanced. Designing thermal
management systems to accommodate steady-state conditions as opposed to fixed duty
cycles can substantially increase cost, size, and weight. The feasibility of transient thermal
management of handsets using phase change materials (PCMs) was experimentally
investigated using an ABS handset mock-up. At selected intervals of time, the nonuniform
case temperature of the handset was measured using an infrared (IR) camera, while
thermocouples measured the temperatures of the PCM and simulated power amplifier
(heater). Transient and steady-state heat transfer rates by natural convective and radiation
from the handset to the environment were numerically computed from the temperature
data in the thermal images. The effects of PCM material, power supplied to the handset,
and handset orientation on the time required for the handset case to reach a given
(maximum) temperature and ‘‘recovery’’ time were examined. [DOI: 10.1115/1.1523061]


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