Countercurrent Water-Cooling Tower. A forced-draft countercurrent water-cooling tower is to cool water from 43.3 to 26.7°C. The air enters the bottom of the tower at 23.9°C with a wet bulb temperature of 21.1°C. The value of Hg for the flow conditions is Ho = 0.533 m. The heat-transfer resistance in the liquid phase will be neglected; i.e., h, is very large. Hence, values of H* should be used. Calculate the tower height needed if 1.5 times the minimum air rate is used. 10.5-2. Minimum Gas Rate and Height of Water-Cooling Tower. It is planned to coolwater from 110°F to 85°F in a packed countercurrent water-cooling tower usingentering air at 85°F with a wet bulb temperature of 75°F. The water flow is 2000lb/h ft² and the air flow is 1400 lb air/h ft2. The overall mass-transfercoefficient is KG a = 6.90 lb mol/h · ſt³ · atm.(a) Calculate the minimum air rate that can be used.(b) Calculate the tower height needed if the air flow of 1400 lb air/h ft² isused..

Given-Information:- Cooling water from 110°F to 85°FAir entering at 85°FWTB = 75°FWater flow = 2000…

Answered: air rate is used.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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Countercurrent Water-Cooling Tower. A forced-draft countercurrent water-cooling tower is to cool water from 43.3 to 26.7°C. The air enters the bottom of the tower at 23.9°C with a wet bulb temperature of 21.1°C. The value of Hg for the flow conditions is Ho = 0.533 m. The heat-transfer resistance in the liquid phase will be neglected; i.e., h, is very large. Hence, values of H* should be used. Calculate the tower height needed if 1.5 times the minimum air rate is used.

10.5-2. Minimum Gas Rate and Height of Water-Cooling Tower. It is planned to cool
water from 110°F to 85°F in a packed countercurrent water-cooling tower using
entering air at 85°F with a wet bulb temperature of 75°F. The water flow is 2000
lb/h ft² and the air flow is 1400 lb air/h ft2. The overall mass-transfer
coefficient is KG a = 6.90 lb mol/h · ſt³ · atm.
(a) Calculate the minimum air rate that can be used.
(b) Calculate the tower height needed if the air flow of 1400 lb air/h ft² is
used.
.

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