Which of the following statements regarding a Rankine cycle with reheating are TRUE? (a) increase in average temperature of heat addition (b) reduction in thermal efficiency (c) drier steam at the turbine exit :
Question
Which of the following statements regarding a Rankine cycle with reheating are TRUE? (a) increase in average temperature of heat addition (b) reduction in thermal efficiency (c) drier steam at the turbine exit :
Solution
The Rankine cycle with reheating has several effects on the overall system:
(a) Increase in average temperature of heat addition: TRUE. Reheating is a process where the steam, after partial expansion, is reheated to approximately the same temperature as the original. This increases the average temperature at which heat is added to the system, which in turn increases the thermal efficiency according to Carnot's principle.
(b) Reduction in thermal efficiency: FALSE. As mentioned above, reheating increases the average temperature of heat addition, which increases the thermal efficiency of the system. This is because the efficiency of a heat engine is directly proportional to the average temperature at which heat is added.
(c) Drier steam at the turbine exit: TRUE. Reheating helps to reduce the moisture content of the steam at the turbine exit. This is beneficial because moisture can cause erosion and damage to the turbine blades. Therefore, reheating helps to improve the lifespan and efficiency of the turbine.
Similar Questions
When a simple Rankine cycle is modified to include reheating for the same mass flowQuestion 1Select one:a.the pump work remains the same, the heat supplied is increased, the heat rejected is increased, the total turbine work increases, and the quality of steam leaving the turbine decreasesb.the pump work remains the same, the heat supplied is increased, the heat rejected stays the same, the total turbine work increases, and the quality of steam leaving the turbine decreasesc.the pump work remains the same, the heat supplied is increased, the heat rejected is increased, the total turbine work increases, and the quality of steam leaving the turbine increasesd.the pump work remains the same, the heat supplied remains the same, the heat rejected is increased, the total turbine work increases, and the quality of steam leaving the turbine increasese.the pump work remains the same, the heat supplied remains increases, the heat rejected stays the same, the total turbine work increases, and the quality of steam leaving the turbine increases
In which of the following conditions, Rankine cycle gives higher efficiency ?Group of answer choicesRegenerative cycleSuperheater cycleSaturated cycleReheat cycle
Consider a simple ideal Rankine cycle and an ideal Rankine cycle with three reheat stages. Both operate between the same pressure limits. The maximum temperature is 900K in the simple cycle and 650 K in the reheat cycle. Which do you think will have the higher thermal efficiency?Question 2Select one:a.simple cycleb.reheat cyclec.both will have the Carnot efficiencyd.it is impossible to tell without more information
Q2. Consider an ideal Rankine cycle where the boiler operates at 12.5 MPa and thecondenser operates at 40 kPa. The steam is superheated after the boiler to 600 oC. Theturbine produces 100 MW of shaft work. Determine:a) The mass flow rate of water through the turbine (in kg/s).b) The work required for the pump.Q3. For the process in Q2. Determine:a) The heat input into the boiler (in MW).b) The heat out for the condenser (in MW)c) The thermal efficiency of the cycle (in %).
For the process in Q2. Determine:a) The heat input into the boiler (in MW).b) The heat out for the condenser (in MW)c) The thermal efficiency of the cycle (in %).
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