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A vertical-tube two-pass heater is used for heating gas oil. Saturated steam at 100 lbf/in^2 gauge is used as a heating medium. The tubes are 1 in. OD by BWG 16 and are made of mild steel. The oil enters at 60°F and leaves at 150°F. The viscosity-temperature relation is exponential. The viscosity at 60°F is 5.0 cP and at 150°F is 1.8 cP. The oil is 37° API (specific gravity 0.840) at 60°F. The flow of oil is 150 bbl/h (1 bbl = 42 gal). Assume the steam condenses in film condensation. The thermal conductivity of the oil is 0.078 Btu/ft-h-°F, and the specific heat is 0.480 Btu/1b-°F. The velocity of the oil in the tubes should be approximately 4 ft/s. Calculate the length of tubes needed for this heater.

A vertical-tube two-pass heater is used for heating gas oil. Saturated steam at 100 lbf/in^2 gauge is used as a heating medium. The tubes are 1 in. OD by BWG 16 and are made of mild steel. The oil enters at 60°F and leaves at 150°F. The viscosity-temperature relation is exponential. The viscosity at 60°F is 5.0 cP and at 150°F is 1.8 cP. The oil is 37° API (specific gravity 0.840) at 60°F. The flow of oil is 150 bbl/h (1 bbl = 42 gal). Assume the steam condenses in film condensation. The thermal conductivity of the oil is 0.078 Btu/ft-h-°F, and the specific heat is 0.480 Btu/1b-°F. The velocity of the oil in the tubes should be approximately 4 ft/s. Calculate the length of tubes needed for this heater.

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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A vertical-tube two-pass heater is used for heating gas oil. Saturated steam at 100 lbf/in^2 gauge is used as a heating medium. The tubes are 1 in. OD by BWG 16 and are made of mild steel. The oil enters at 60°F and leaves at 150°F. The viscosity-temperature relation is exponential. The viscosity at 60°F is 5.0 cP and at 150°F is 1.8 cP. The oil is 37° API (specific gravity 0.840) at 60°F. The flow of oil is 150 bbl/h (1 bbl = 42 gal). Assume the steam condenses in film condensation. The thermal conductivity of the oil is 0.078 Btu/ft-h-°F, and the specific heat is 0.480 Btu/1b-°F. The velocity of the oil in the tubes should be approximately 4 ft/s. Calculate the length of tubes needed for this heater.
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