Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 05 Jan 2018 My Price 6.00

cross-flow heat exchanger

Hot air for a large-scale drying operation is to be produced by routing the air over a tube bank (unmixed), while products of combustion are routed through the tubes. The surface area of the cross-flow heat exchanger is A 25 m2, and for the proposed operating conditions, the manufacturer specifies an overall heat transfer coefficient of U 35 W/m2 ∙ K. The air and the combustion gases may each be assumed to have a specific heat of cp = 1040 J/kg ∙ K. Consider conditions for which combustion gases flowing at 1 kg/s enter the heat exchanger at 800 K, while air at 5 kg/s has an inlet temperature of 300 K. (a) What are the air and gas outlet temperatures?

 

(b) After extended operation, deposits on the inner tube surfaces are expected to provide a fouling resistance of  Should operation be suspended in order to clean the tubes?

(c) The heat exchanger performance may be improved by increasing the surface area and/or the overall heat transfer coefficient. Explore the effect of such changes on the air outlet temperature for 500 ≤ UA ≤ 2500 W/K.

 

Answers

Maurice Tutor
(5)
Status NEW Posted 05 Jan 2018 12:01 PM My Price 6.00

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