Maurice Tutor

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Category > Engineering Posted 14 May 2018 My Price 5.00

specific flow exergy

7.137           Figure P7.137 shows a boiler at steady state. Steam having a specific flow exergy of 1300 kJ/kg exits the boiler at a mass flow rate of 5.69 3 104 kg/h. The cost of owning and operating the boiler is $91/h. The ratio of the exiting steam exergy to the entering fuel exergy is 0.45. The unit cost of the fuel based on exergy is $1.50 per 106 kJ. If the cost rates of the combustion air, feedwater, heat transfer with the surroundings, and exiting combustion products are ignored, develop

(a)   an expression in terms of exergetic efficiency and other pertinent quantities for the unit cost based on exergy of the steam exiting the boiler.

(b)   Using the result of part (a), determine the unit cost of the steam, in cents per kg of steam flowing.

 

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Maurice Tutor
(5)
Status NEW Posted 14 May 2018 02:05 PM My Price 5.00

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