In steam power plants, open feed water heaters are frequently utilized to heat the feed water by mixing it with steam bled off the turbine at some intermediate stage. Consider an open feed water heater that operates at a pressure of 1000 kPa. Feed water at 50°C and 1000 kPa is to be heated with superheated steam at 200°C and 1000 kPa. In an ideal feed water heater, thse mixture leaves the heater as saturated liquid at the feed water pressure. Determine the ratio of the mass flow rates of the feed water and the superheated vapor for this case.

Transcribed Image Text:

H20 sat (P 1000 kPa) iquid FIGURE P5-72