Discussion
For an ideal regenerative Rankine cycle, as shown in the figure below, which one of the following options is the correct representation of temperature-entropy (T-s) diagram?
- A.
- B.
- C.
- D.
Answer: A
The correct T-s diagram is (A), in which the turbine expansion 4-5 runs parallel to the liquid heating line 2-3.
In the ideal regenerative cycle the feed water from the pump flows through coils in the turbine casing, counter to the steam. Heat passes reversibly from the expanding steam to the water across zero temperature difference, so at every temperature the heat the steam gives up equals the heat the water gains.
On the T-s diagram that makes the expansion curve 4-5 a mirror of the heating curve 2-3, shifted to the right by a constant entropy, so the two are parallel. Diagram (B) shows an isentropic, vertical expansion, which is the simple Rankine cycle without regeneration. Diagram (C) raises the water to the boiler temperature in the pump, which a pump cannot do, and diagram (D) expands along the vapour dome, which is not what internal heat exchange produces.
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development