Required information Consider operation of a single-pass cross-flow heat exchanger with water (cp=4193 J/kg-K) (mixed) and methanol (cp=2577 J/kg-K) (unmixed). Water entering and exiting the heat exchanger at 93°C and 60°C, respectively, is used to heat the methanol initially at 10°C. The overall heat transfer coefficient and the total heat transfer rate is estimated to be 650 W/m2.K and 250 kW, respectively. An effectiveness of at least 0.5 is to be achieved.

Required information Consider operation of a single-pass cross-flow heat exchanger with water (cp=4193 J/kg-K) (mixed) and methanol (cp=2577 J/kg-K) (unmixed). Water entering and exiting the heat exchanger at 93°C and 60°C, respectively, is used to heat the methanol initially at 10°C. The overall heat transfer coefficient and the total heat transfer rate is estimated to be 650 W/m2.K and 250 kW, respectively. An effectiveness of at least 0.5 is to be achieved.

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.

Chapter10: Heat Exchangers

Section: Chapter Questions

Problem 10.6P: Mot water is used to heat air in a double-pipe heat exchanger as shown in the following sketch. If...

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Concept explainers

Heat Exchangers

Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.

Heat Exchanger

The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.

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Required information
Consider operation of a single-pass cross-flow heat exchanger with water
(cp=4193 J/kg-K) (mixed) and methanol (cp=2577 J/kg-K) (unmixed).
Water entering and exiting the heat exchanger at 93°C and 60°C,
respectively, is used to heat the methanol initially at 10°C. The overall heat
transfer coefficient and the total heat transfer rate is estimated to be 650
W/m².K and 250 kW, respectively. An effectiveness of at least 0.5 is to be
achieved.
Calculate the mass flow rate of water. (Round the answer to two decimal places.)
The mass flow rate of water is
kg/s.

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