A reversibly operating heat engine operates between two reservoirs with temperatures between 600 ℃ and 40 ℃, and the heat energy supplied to the heat engine from the 600 ℃ reservoir is 2000 kJ. This heat engine operates a refrigerator that operates reversibly between two reservoirs with temperatures between 40°C and -20°C. Since the net work output of the whole system is 360 kJ; (a) Calculate the net amount of heat transferred to the refrigerator and the reservoir at 40℃. (The reservoir at 40℃ is common for both refrigerator and heat machine.) (b) What would happen if the heat engine and refrigerator were working at 40% efficiency rather than reversibly? Recalculate part (a) for this case

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A: TH=18°CTH=18+273=291 KTL=2°C+273=275 KQ1=27000 KJhrQ2=140000 KJhr

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.