A steam boiler heats liquid water at 100°C to superheated steam at 1 MPa and 250°C. Fuel [CH4 (g)] is burned at atmospheric pressure with 50 percent excess air. The fuel and air enter the boiler at 25°C and the products of combustion leave at 300°C. Firstly: Sketch the T-s diagram for the boiler, and secondly: Calculate by parametric analysis (a) the amount of steam generated per unit of fuel mass burned, (b) the change in the exergy of the combustion streams, in kJ/kg fuel, (c) the change in the exergy of the steam stream, in kJ/kg steam, and (d) the lost work potential, in kJ/kg fuel. Take TO=25°C, PO=100kPa and assume air, fuel and products have constant Cp at average temperature.

A steam boiler heats liquid water at 100°C to superheated steam at 1 MPa and 250°C. Fuel [CH4 (g)] is burned at atmospheric pressure with 50 percent excess air. The fuel and air enter the boiler at 25°C and the products of combustion leave at 300°C. Firstly: Sketch the T-s diagram for the boiler, and secondly: Calculate by parametric analysis (a) the amount of steam generated per unit of fuel mass burned, (b) the change in the exergy of the combustion streams, in kJ/kg fuel, (c) the change in the exergy of the steam stream, in kJ/kg steam, and (d) the lost work potential, in kJ/kg fuel. Take TO=25°C, PO=100kPa and assume air, fuel and products have constant Cp at average temperature.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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