Actual reheat Rankine cycle

Example 4.14 Actual reheat Rankine cycle in steam power generation A reheat Rankine cycle is used in a steam power plant (see Figure 4.20). Steam enters the high-pressure turbine at 9000kPa and 823.15K and leaves at 4350kPa. The steam is reheated at constant pressure to 823.15 K. The steam enters the low-pressure turbine at 4350kPa and 823.15K. The discharged steam from the low-pressure turbine is at lOkPa. The net power output of the turbine is 65 MW. The isentropic turbine efficiency is 80%. The pump efficiency is 95%. Determine ... 

W 65,000 1, m= = = 53.95kg/s Wnet 1204.68 Table 4.2a shows the state properties of the actual reheat Rankine cycle. Table 4.2a State properties of the actual reheat Rankine cycle in Example 4.14 ... 

Example 4.14 Actual reheat Rankine cycle in a steam power generation... 

Table 4.2a State properties of the actual reheat Rankine cycle In Example 4.14 ...

Table 4.2b Distribution of exergy losses in actual and ideal reheat Rankine cycles ...

Table 4.4a shows the state properties of the actual reheat regenerative Rankine cycle. 

Figure 4.24. (a) Schematic of actual reheat regenerative Rankine cycle and (b) T-S diagram. 

A steam power plant is using an actual reheat regenerative Rankine cycle. Steam enters the high-pressure turbine at 10,800kPa and 773.15 K, and the condenser operates at 15 kPa. The steam is extracted from the turbine at 2000 kPa to heat the water in an open heater. The steam is extracted at 475 kPa for process heat. The water is a saturated liquid after leaving the water heater. The work output of the turbine is 95 MW. The turbine efficiency is 82%. The pumps operate isentropically. Determine the work loss at each unit if the surroundings are at 295 K. 

Table 4.4a shows the state properties of the actual reheat regenerative Rankine cycle. The fraction of steam extracted is estimated from the energy balance In terms of the mass fraction z = we have +(I —z) Z/, ... 

---