Consider heat transfer between two identical hot solid bodies and the air surrounding them. The first solid is being cooled by a fan while the second one is allowed to cool naturally. For which solid is the lumped system analysis more likely to be applicable? Why?

Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Katz, Debora M.
Chapter21: Heat And The First Law Of Thermodynamics
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Consider heat transfer between two identical hot
solid bodies and the air surrounding them. The first solid is
being cooled by a fan while the second one is allowed to cool
naturally. For which solid is the lumped system analysis more
likely to be applicable? Why?

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