1.Įvaluate the Carnot efficiency and compare this with the Joule efficiency explain why the Joule efficiency is the lower. Temperature-entropy diagram for Joule cyle. What is the maximum work output from the engine as the reservoir temperatures equalise? Is the equalisation temperature for maximum work a higher or lower limit of the equalisation temperature?Ĭlosed cycle gas turbines operate on the internally reversible Joule cycle with an efficiency ofįigure P6.3. The temperature of the hot reservoir falls by 1 K for each 1 kJ extracted from it, while the temperature of the cold reservoir rises by 1 K for each 1 kJ added. The maximum and minimum temperatures of the working fluid at maximum power output.ĭerive all the necessary equations, but assume the Carnot efficiency, η = 1− T C/ T H.Ī heat engine operates between two finite reservoirs, initially at 800 and 200 K, respectively. The maximum power output, W ˙ / C H and 5. The engine efficiency at maximum power output 4. If the heat transfer conductance from the reservoirs to the engine are in the ratio ( UA) H/( UA) C = C H/ C C = 2, evaluate the following: 1. Introducing the concept of external irreversibility, evaluate the efficiency of an endoreversible engine at maximum power output.Ĭonsider a heat engine connected to high-temperature reservoir at T H = 1200 K and a low temperature one at T C = 300 K. Explain why the Carnot cycle efficiency is unrealistically high for a real engine.
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