A regenerative steam cycle operates with two stages of expansion and a single open feed heater. The condenser operates at a pressure of 0.2bar. Steam enters the turbine as dry saturated steam with a pressure of 30bar. For a bleed pressure of 20bar, calculate the proportion of steam bled from the turbine assuming steam leaves the feed heater at the saturation temperature associated with the bleed pressure.

 

Temperature C 0 T4 (K) Gas temperature reduces T5 (K) Constant steam temperature Reduced temperature difference at this point. This is know as a "pinch point". Here the heat transfer may become severely limited due to the low temperature difference between the fluid Cycle Position T6 (K) T1 (K) -T gas -T steam