Water is the working fluid in a regenerative Rankine cycle. The pressure and tem
ID: 2996716 • Letter: W
Question
Water is the working fluid in a regenerative Rankine cycle. The pressure and
temperature at the turbine inlet are 8MPa and 550?C, respectively, and the condenser
pressure is 7.5KPa. The mass flow rate of steam entering the turbine is 176kg/s.
Included in the cycle is one closed feed water heater using extracted steam at
1800KPa and one open feed water heater operating at 275KPa. Saturated liquid
condensate is throttled from the closed feed water heater at 1800KPa to the open feed
water heater. The feed water leaves the closed heater at 8MPa, 200?C, and saturated
liquid leaves the open heater at 275KPa. The cooling water experiences a
temperature increase from 15?C to 27?C with negligible pressure drop as it passes
through the condenser. Draw the T-s diagram (hint: it would help to begin with a
schematic of the cycle) and Determine:
a. The net power developed in KW
b. The thermal efficiency of the cycle
c. The mass flow rate of cooling water in kg/s
Explanation / Answer
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