It is desired to improve the thermal efficiency of the Rankine power generation cycle. Two possibilities have been suggested. One is to increase the evaporator temperature, and the second is to decrease the condenser temperature (and consequently the pressure) of the low-pressure part of the cycle. 

a. Draw a T-Ŝ diagram for the Rankine cycle similar to that in Fig. 5.2-2d, but with a higher evaporator temperature. Show from a comparison of those two diagrams that the efficiency of the Rankine power generation cycle increases with increasing evaporator temperature.

Fig. 5.2-2d

b. Repeat part (a) for a lower condenser temperature.

Transcribed Image Text:

T 1 S (d) (3 (4)