A 4-pass-low-pressure surface type feedwater heater is designed to heat 92,730 kg/hr of feedwater from 40°C initial to 80°C final temperature using steam bleed at 70 kpa abs. containing 2,645 Kj/kg enthalpy. Assume no subcooling of condensate, determine the effective length of 19 mm O.D x 2 mm thick Muntz metal tubes to be installed, if the water velocity inside the tubes is 1.22 m/s and U = 3000 W /m²k based on the external surface of the tubes.

A 4-pass-low-pressure surface type feedwater heater is designed to heat 92,730 kg/hr of feedwater from 40°C initial to 80°C final temperature using steam bleed at 70 kpa abs. containing 2,645 Kj/kg enthalpy. Assume no subcooling of condensate, determine the effective length of 19 mm O.D x 2 mm thick Muntz metal tubes to be installed, if the water velocity inside the tubes is 1.22 m/s and U = 3000 W /m²k based on the external surface of the tubes.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter47: High-pressure, Low-pressure, And Absorption Chilled-water Systems

Section: Chapter Questions

Problem 13RQ: The subcooling temperature in a condenser can be measured by taking the difference between the A....

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