Q1: Air at 300 K and 50 kPa flows over a 2-m-square plate at a velocity of 70 m/s. The plate is maintained at a constant temperature of 350 K. Calculate the heat lost by the plate.
Q1: Air at 300 K and 50 kPa flows over a 2-m-square plate at a velocity of 70 m/s. The plate is maintained at a constant temperature of 350 K. Calculate the heat lost by the plate.
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter10: Heat Exchangers
Section: Chapter Questions
Problem 10.46P
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![Qi:
Air at 300 K and 50 kPa flows over a 2-m-square plate at a velocity of 70 m/s. The
plate is maintained at a constant temperature of 350 K. Calculate the heat lost by the
plate.
Q2:
A cross-flow heat exchanger is used to cool a hot oil (c=1.9 kJ/kg • •C) from 130 to
105°C. The oil flows inside the tubes over which cooling water performs the cooling
process. The water enters the exchanger at 35°C and leaves the exchanger at 60°C.
The overall heat transfer coefficient is 50/m2.°C. What size exchanger will be required
to cool 3800 kg/h of oil?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F66da87bb-149b-4f89-8617-b4bd0439ae78%2F3923975b-3371-4a5c-b02d-48ad0ec1b862%2Fzto82gr_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Qi:
Air at 300 K and 50 kPa flows over a 2-m-square plate at a velocity of 70 m/s. The
plate is maintained at a constant temperature of 350 K. Calculate the heat lost by the
plate.
Q2:
A cross-flow heat exchanger is used to cool a hot oil (c=1.9 kJ/kg • •C) from 130 to
105°C. The oil flows inside the tubes over which cooling water performs the cooling
process. The water enters the exchanger at 35°C and leaves the exchanger at 60°C.
The overall heat transfer coefficient is 50/m2.°C. What size exchanger will be required
to cool 3800 kg/h of oil?
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