Question 44Steam Plants - Assistant Engineer
70% to passIf the main condenser were operating at a vacuum of 28.5" Hg, a condensate discharge temperature of 86°F, a sea water inlet temperature of 72°F, and a sea water outlet temperature of 79°F, what would be the condensate depression? Illustration SG-0026
A0.2 inches Hg
B0.7 inches Hg
C4 degrees Fahrenheit
D7 degrees Fahrenheit
AI Explanation
The correct answer is C) 4 degrees Fahrenheit. The condensate depression is the difference between the temperature of the condensate discharge and the saturation temperature corresponding to the main condenser vacuum. With a vacuum of 28.5" Hg, the saturation temperature would be around 92°F. Since the condensate discharge temperature is 86°F, the condensate depression is 92°F - 86°F = 4 degrees Fahrenheit. The other options are incorrect because A) 0.2 inches Hg is the incorrect unit, B) 0.7 inches Hg is not the correct value, and D) 7 degrees Fahrenheit is not the correct temperature difference.
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