Question

In a steam-heating system, air is heated by being
passed over some tubes through which steam flows steadily. Steam enters the heat exchanger at 30 psia and 400°F at
a rate of 15 lbm/min and leaves at 25 psia and 212°F. Air
enters at 14.7 psia and 80°F and leaves at 130°F. Determine
the volume flow rate of air at the inlet.

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