Answered: Consider two geothermal wells whose…

Consider two geothermal wells whose energy contents are estimated to be the same. Will the exergies of these wells necessarily be the same? Explain.

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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Consider two geothermal wells whose energy contents are estimated to be the same. Will the exergies of these wells necessarily be the same? Explain.

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1. A source of heat at 1000 K transfers 1000 kW of power to a power generation device, while producing 300 kW of useful work. Determine: a. The rate of exergy destruction in this process if the environment is at 300K. b. The second law efficiency of the system.
Make use of second law of thermodynamics to prove that two reversible adiabatic lines cannot intersect
It is proposed to have carbon dioxide (CO2) gas pass through an uninsulated nozzle. The CO2 is to enter at 253 K, 400 kPa, at a velocity of 9 m/s. The CO2 is to exit the nozzle at 468 K, 105 kPa, and a velocity of 146 m/s. The mass flow rate of the CO2 is 0.33 kg/s. The nozzle surface is maintained at 393 K. From the data give the heat trasfer rate dtermined is____ k..... to 2 d.p. Use cold-air standard analysis and Take R= 0.1889 kJ/kgK and Cp=0.846 kJ/kgK
The heat across a wall dropped from 30C to 15C and 400W of heat lost while the outside temperature is 25C., the rate of exergy destruction within the wall in Watt is O 41 W O 20 W O 15 W O 51 W O 108 W O none of the above
In an evaporator of an air conditioning system, R134a enters at a quality of 0.2 and exits as saturated vapor at a temperature of -10 C. Air enters the evaporator unit at a temperature of 33 C and exits at 17 C with a mass flow rate of 0.3 kg/s. Calculate the rate of exergy destroyed in the evaporator in kW. Take the surrounding temperature to be 35 C. Hint: You will need to calculate the refrigerant mass flow rate first by taking the entire evaporator as a system and writing the first law of thermodynamics.
Question 2 Three kilograms of water in a piston-cylinder assembly, initially at 100 kPa and 75°C, are heated at constant pressure with no internal irreversibilities to a final temperature of 500°C. For the water, Plot the processes on the P-v curve and determine: (a) the change in exergy, (b) the exergy transfer accompanying heat transfer, (c) the exergy transfer accompanying work, and (d) the exergy destruction. Take To = 25 °C, Po = 100 kPa and ignore the effects of motion and gravity.
It is proposed to have carbon dioxide (CO2) gas pass through an uninsulated nozzle. The CO2 is to enter at 284 K, 430 kPa, at a velocity of 4 m/s. The CO2 is to exit the nozzle at 343 K, 82 kPa, and a velocity of 130 m/s. The mass flow rate of the CO2 is 0.25 kg/s. The nozzle surface is maintained at 395 K. The rate of entropy generation for the proposed process is ____ kW..... to 4 d.p. Use cold-air standard analysis and Take R= 0.1889 kJ/kgK and Cp=0.846 kJ/kgK
Which is the correct answer