Assignment:
250 psi saturated steam at approximately 400 degrees F is used to pre-heat ambient air at 60 degrees F through a 100% theoretically efficient heat exchanger.
The desire is to raise the temperature of the ambient air from 60 degree F to 350 degrees F . Calculate the amount of steam energy in BTU's per minutes and lbs of steam per minute necessary to accomplish the increase in air temperature??
This is all the problem information provides other than the air is at atmospheric pressure.
How would you determine the temperature of the outlet steam from the HX?? Would it be at a low enough temperature to condense?