Question

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Question: a)

i) A Carnot engine which operates between two heat reservoirs has an efficiency of η = 10%. [3] Calculate a coefficient of refrigeration performance of the Carnot refrigerator operates between the same reservoirs.

ii)m1 = 300 g of copper with initial temperature T1 = 97 [3] ◦C is deep into 0.1 ` of water with initial temperature T2 = 7◦C. The water density is ρ = 1 kg ` −1 . Specific heat of copper is c1 = 0.39 J g−1 K−1 . Specific heat of water is c2 = 4.18 J g−1 K−1 . Calculate the increment of the entropy by the moment of temperature equilibrium.

iii)The water ice with the initial temperature T1 = 0 [3] ◦C is melted, then heated to the temperature T2 = 100◦C and completely evaporated. The latent heat of ice fusion is λ = 333.5 kJ kg−1 The latent heat of water evaporation is Λ = 2257.1 kJ kg−1 The specific heat of water is c = 4.2 kJ kg−1 K−1 Calculate the increment of the specific entropy of the system.

Answer 1