a) A heat engine takes 325 kJ of heat from a 100 K energy reservoir and also 125 kJ of waste hea It throws it into a 400K energy reservoir. Meanwhile, it releases an energy of 200 kJ. Is the cycle in which this heat engine operates reversible? Is it irreversible? Is it impossible?

a) A heat engine takes 325 kJ of heat from a 100 K energy reservoir and also 125 kJ of waste hea It throws it into a 400K energy reservoir. Meanwhile, it releases an energy of 200 kJ. Is the cycle in which this heat engine operates reversible? Is it irreversible? Is it impossible?

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.46P

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Question

a) A heat engine takes 325 kJ of heat from a 1000
K energy reservoir and also 125 kJ of waste heat
It throws it into a 400K energy reservoir.
Meanwhile, it releases an energy of 200 kJ.
Is the cycle in which this heat engine operates
reversible? Is it irreversible? Is it impossible?
Why?
b) An inventor designed a cooling device with an
efficiency coefficient of 8.5 between -10°C indoor
temperature and 25°C room temperature.
He claims to be running his machine. Could this
claim be true? Why?

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