- A square chip, with side ? = 5 mm, operates under isothermal conditions. The chip is positioned on a substrate so that its side and bottom surfaces are thermally insulated, while its top surface is exposed to the flow of a refrigerant at ?∞ = 15°C. From reliability considerations, the chip temperature cannot exceed ? = 85°C. The refrigerant being air, with a convection heat transfer coefficient corresponding ℎ = 200 W/(m2K), what is the maximum allowable power for the chip? Since the coolant is a dielectric liquid for which ℎ = 3000 W/(m2K), what is the maximum allowed power?

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Russell E. Smith
Chapter17: Commercial And Industrial Air-conditioning Control Systems
Section: Chapter Questions
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1 - A square chip, with side ? = 5 mm, operates under isothermal conditions.
The chip is positioned on a substrate so that its side and bottom surfaces are thermally insulated, while its top surface is exposed to the
flow of a refrigerant at ?∞ = 15°C.


From reliability considerations, the chip temperature cannot exceed ? = 85°C. The refrigerant being air, with a convection heat transfer coefficient
corresponding ℎ = 200 W/(m2K), what is the maximum allowable power for the chip?


Since the coolant is a dielectric liquid for which ℎ = 3000 W/(m2K), what is the maximum allowed power?

REFRIGERATOR
Chip
Transcribed Image Text:REFRIGERATOR Chip
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