A power plant needs to evaporate 1000.0 lb_m/h of water at 90.0 F at 1 atm. Utility superheated steam at 1000 F and 40 bar is available, but the steam cannot drop below 20 bar and 600 F.

Use the steam tables to determine the specific enthalpies of the four streams. The reference for the enthalpies should be water at the triple point. You may interpolate in Tables B6. and B.7, and can also use external, automated sources.

Please show how to get H value in the steam tables and explain how to get these results by using interpolation