Reheat Rankine cycle

Applying the first law of thermodynamics of the open system to each of the six processes of the reheat Rankine cycle yields ... 

A steam reheat Rankine cycle operates between the pressure limits of 5 and 1600 psia. Steam is superheated to 600° F before it is expanded to the reheat pressure of 500 psia. Steam is reheated to 600°F. The steam flow rate is 8001bm/hr. Determine the quality of steam at the exit of the turbine, the cycle efficiency, and the power produced by the cycle. 

What is the purpose of reheat in a reheat Rankine cycle ... 

Is the efficiency of a reheat Rankine cycle always higher than the efficiency of a simple Rankine cycle operating between the same boiler pressure and condenser pressure ... 

Consider a steam power plant operating on the ideal reheat Rankine cycle 1 kg/sec of steam flow enters the high-pressure turbine at 15 MPa and 600° C and leaves at 5 MPa. Steam is reheated to 600° C and enters the low-pressure turbine. Exhaust steam from the turbine is condensed in the condenser at lOkPa. Determine ... 

Fig. 5.12. In general, modifications of both the Brayton and Rankine cycles could also be included. Since the net work output is equal to the sum of the two outputs and the heat input is that of the topping cycle alone, a substantial increase in cycle efficiency is possible. Another arrangement of the Brayton/ Rankine cycle, which is a combination of a two-stage reheat Brayton cycle and a two-stage reheat Rankine cycle, is shown in Fig. 5.13. 

Example 4.13 Simple reheat Rankine cycle in a steam power plant A simple ideal reheat Rankine cycle is used in a steam power plant (see Figure 4.19). Steam enters the turbine at 9000kPa and 823.15 K and leaves at 4350kPa. The steam is reheated at constant pressure to 823.15K. The discharged steam from the low-pressure turbine is at 10 kPa. The net power output of the turbine is 65 MW. Determine the thermal efficiency and the work loss at each unit. 

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 ... 

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

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

A reheat Rankine cycle is used in a steam power plant. Steam enters the high-pressure turbine at 10,000 kPa and 823.15 K and leaves at 4350 kPa. The steam is reheated at constant pressure to... 

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

---