Air is being heated with hot oil in banks. The tubes are made of an alloy with thermal conductivity (K = 310 W/mk). The hot oil is at a temperature of 125 degree Celsius and flows inside the tubes. The air flows on the outside. Air enters at 20 degrees Celsius with a mean velocity of 5.8 m/s and at 1 atm. The tubes are thin wall with a diameter of 2cm. The tubes are arranged in staggered arrangement with longitudinal transverse pitches of S₁ =ST= 5cm. There are 21 rows in the flow direction with 8 tubes per row. Assume an exit temperature of the air from the tube bank as 80 degrees Celsius and based on this, determine the following per unit length of the tubes. Note that you are not supposed to perform any iterations. Just perform calculations for the first iteration with starting temperature of 80 degrees Celsius. For this iteration compute: a) New exit temperature of air from the tube bank b) Rate of heat transfer per unit length of the tubes c) Pressure drop for air flow across the tubes

Air is being heated with hot oil in banks. The tubes are made of an alloy with thermal conductivity (K = 310 W/mk). The hot oil is at a temperature of 125 degree Celsius and flows inside the tubes. The air flows on the outside. Air enters at 20 degrees Celsius with a mean velocity of 5.8 m/s and at 1 atm. The tubes are thin wall with a diameter of 2cm. The tubes are arranged in staggered arrangement with longitudinal transverse pitches of S₁ =ST= 5cm. There are 21 rows in the flow direction with 8 tubes per row. Assume an exit temperature of the air from the tube bank as 80 degrees Celsius and based on this, determine the following per unit length of the tubes. Note that you are not supposed to perform any iterations. Just perform calculations for the first iteration with starting temperature of 80 degrees Celsius. For this iteration compute: a) New exit temperature of air from the tube bank b) Rate of heat transfer per unit length of the tubes c) Pressure drop for air flow across the tubes

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.

Chapter6: Forced Convection Over Exterior Surfaces

Section: Chapter Questions

Problem 6.21P

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