DUE 9/2. Calculate the overall heat-transfer coefficient based on both inside and outside areas for the following cases. All individual coefficients are given in usual units. tube Case 1. Water at 50 °F flowing in a 3/4-in. 16 BWG condenser tube at a velocity of 15 ft/s and saturated steam at 220 °F condensing on the outside. h, 2,150; h.-2,500; km=69. Case 2. Benzene condensing at atmospheric pressure on the outside of a 25-mm steel pipe and air at 15 °C flowing within at 6 m/s. The pipe wall is 3.5 mm thick. h-30 W/m²-°C; h.-1,200 W/m²-°C; k=45 W/m-°C. Case 3. Dropwise condensation from steam at a pressure of 50 lb/in.² gage on a Schedule 40 1-in. steel pipe carrying oil at a velocity of 3 ft/s. h.-130; h.-14,300; k-26. convection inside

Introduction to Chemical Engineering Thermodynamics
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Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
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4.
AT
Tz)
T-7)
DUE 9/2. Calculate the overall heat-transfer coefficient based on both inside and outside areas for the
following cases. All individual coefficients are given in usual units.
tube
Case 1. Water at 50 °F flowing in a 3/4-in. 16 BWG condenser tube at a velocity of 15 ft/s and saturated steam
at 220 °F condensing on the outside. h, 2,150; h.-2,500; km=69.
Case 2. Benzene condensing at atmospheric pressure on the outside of a 25-mm steel pipe and air at 15 °C
flowing within at 6 m/s. The pipe wall is 3.5 mm thick. h;-30 W/m²-°C; h.-1,200 W/m²-°C; k=45 W/m-°C.
Case 3. Dropwise condensation from steam at a pressure of 50 lb/in.² gage on a Schedule 40 1-in. steel pipe
carrying oil at a velocity of 3 ft/s. h=130; ho=14,300; km-26.
convection
+
inside
Transcribed Image Text:4. AT Tz) T-7) DUE 9/2. Calculate the overall heat-transfer coefficient based on both inside and outside areas for the following cases. All individual coefficients are given in usual units. tube Case 1. Water at 50 °F flowing in a 3/4-in. 16 BWG condenser tube at a velocity of 15 ft/s and saturated steam at 220 °F condensing on the outside. h, 2,150; h.-2,500; km=69. Case 2. Benzene condensing at atmospheric pressure on the outside of a 25-mm steel pipe and air at 15 °C flowing within at 6 m/s. The pipe wall is 3.5 mm thick. h;-30 W/m²-°C; h.-1,200 W/m²-°C; k=45 W/m-°C. Case 3. Dropwise condensation from steam at a pressure of 50 lb/in.² gage on a Schedule 40 1-in. steel pipe carrying oil at a velocity of 3 ft/s. h=130; ho=14,300; km-26. convection + inside
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