Answered: Using the second law of thermodynamics,…

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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a) Using the second law of thermodynamics, describe exergy d law of thermodynamics, describe exergy. Explain the different types of exergy b) What do you understand by the term reference environme c) Determine the specific exergy of saturated water vapour we having a velocity of 30m/s and an elevation of 6m, each relative to an exergy reference environment where T = 298K. P. = 1 atm and g = 9.8m/s. d) Steam enters a turbine with a pressure of 30 bar, a temperature of 400°C, a velocity of 160 m/s and exits as saturated vapor at 100°C with a velocity of 100 m/s. At steady state, the turbine develops work at a rate of 540 kJ per kg of steam flowing through the turbine. The heat transfer rate (cv/m = -22.6 – Heat transfer between the turbine and its surroundings occurs at an average outer surface temperature of 350 K. Neglect the change in potential energy between the inlet and exit of the turbine, and assume that To = 25°C. Po =1 atm. Using a neat sketch, determine: i net exergy carried in per unit mass of steam flowing rate of exergy accompanying heat the cost of exergy destruction in Pula if exergy loss costs Pula 0.05 per kW for a steam flow rate of 150kg/s.

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