A furnace is to be designed for a heat duty of 30 x 10° Btu/hr and efficiency of 75%. The furnace is fired with gaseous fuel at a rate of 17 lb air/lb fuel (NHV=17000 Btu/lb). The tubes are arranged in two rows and are of 5 inch out diameter OD. With 40 ft length and 2×OD center to center Spacing, heat rate of 35000 Btu/hr of projected area is recommended. Calculate: 1) Percentage of heat absorbed in radiation section (R%). 2) The number of tubes in the radiation section. 3) Heat absorbed in the convection section. (State any assumptions used).

A furnace is to be designed for a heat duty of 30 x 10° Btu/hr and efficiency of 75%. The furnace is fired with gaseous fuel at a rate of 17 lb air/lb fuel (NHV=17000 Btu/lb). The tubes are arranged in two rows and are of 5 inch out diameter OD. With 40 ft length and 2×OD center to center Spacing, heat rate of 35000 Btu/hr of projected area is recommended. Calculate: 1) Percentage of heat absorbed in radiation section (R%). 2) The number of tubes in the radiation section. 3) Heat absorbed in the convection section. (State any assumptions used).

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.

Chapter9: Heat Transfer With Phase Change

Section: Chapter Questions

Problem 9.35P

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