This program calculates the amount of steam that can be generated by a fired or unfired waste heat boiler (Heat Recovery Steam Generator). The steam and condensate properties are built in.� The program first calculates a design mode and then an "off-performance mode" for changed conditions. Note: the purpose of this progam is to predict the amount of steam that can be generated from a waste heat source. The program does not calculate the square feet of each section of the HRSG. Instead it calculates the value of U x A.