Question

Consider a simple ideal Rankine cycle with fixed turbine inlet temperature and condenser pressure. What is the effect of increasing the boiler pressure on:_______.
Pump work input: (a) increase (b) decrease (c) remains the same
Turbine work output: (a) increase (b) decrease (c) remains the same
Heat supplied: (a) increase (b) decrease (c) remains the same
Heat rejected: (a) increase (b) decrease (c) remains the same
Cycle efficiency: (a) increase (b) decrease (c) remains the same
Moisture content at turbine exit: (a) increase (b) decrease (c) remains the same

Answer 1

Answer:

• increase
• increase
• decrease
• decrease
• increase
• increase

Explanation:

EFFECT OF INCREASING THE BOLIER PRESSURE ON

• pump work output ;  Increase
• Turbine work output ; Increase
• Heat supplied ; Decrease and this is because the latent heat been supplied will decrease when there is an increase in pressure
• Heat Rejected ; Decrease
• cycle efficiency ; Increase, the increase in the cycle efficiency increases in a very significant amount/rate because cycle efficiency = power output / heat input
• Moisture content at Turbine exit ; Increases