Answer:
a)
b)
c) 
Explanation:
a) The heat lost by the power plant is:

The waste heat used by heat exchanger is:

Assuming that air behaves as an ideal gas, density is given by following expression:


The density unit is converted to pounds per cubic feet:

The heat received by air flow through heat exchanger is:

Outlet temperature can isolated from the following formula:



b) Due to the compressibility of air, density has to be calculated by using the approach from section a).


Volumetric flow can be found by Principle of Mass Conservation:


c) The moisture component indicates that 88 percent of volume is occupied by dry-air. The moisture-corrected dry flow rate is:
