Question

Two engines A and B have their sources at 400 K and  350 K and sinks at 350 K and 300 k respectively. Which engine is more efficient and by how much?

Answer 1

For engine A, T₁ = 400 K, T₂ = 350 K

Since, η_B > η_A, therefore, engine B is more efficient than engine A by 14.3 - 12.5 = 1.8%.