Example 3
For a coal-fired utility boiler, the temperature of high pressure steam (Thot)would be about 540°C and Tcold the cooling tower water temperature would be about 20°C. Calculate the Carnot efficiency of the power plant:
Solution:
Carnot efficiency depends on high temperature and low temperatures between which the heat engine operates. We are given both temperatures. However, the temperatures need to be converted to Kelvin:
Thot = 540°C+273 = 813 K
Tcold = 20°C + 273 = 293 K
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