Figure 36 Steam Cycle (Ideal)

Figure 35 Typical Steam Cycle

Figure 38 Mullier Diagram

Thermodynamics Heat Transfer and Fluid Flow Volume 1 of 3
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SECOND LAW OF THERMODYNAMICS Thermodynamics Figure 36 Steam Cycle (Ideal) Figure 37 is a T-s diagram of a cycle which more closely approximates actual plant processes. The pumps and turbines in this cycle more closely approximate real pumps and turbines and thus exhibit an entropy increase across them. Additionally, in this cycle, a small degree of subcooling is evident in the condenser as shown by the small dip down to point 5. This small amount of subcooling will decrease cycle efficiency since additional heat has been removed from the cycle to the cooling water as heat rejected. This additional heat rejected must then be made up for in the steam generator. Therefore, it can be seen that excessive condenser subcooling will decrease cycle efficiency. By controlling the temperature or flow rate of the cooling water to the condenser, the operator can directly effect the overall cycle efficiency. Figure 37 Steam Cycle (Real) HT-01 Page 92 Rev. 0

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