Q&A

What is the difference between reheat and regenerative cycle?

What is the difference between reheat and regenerative cycle?

Reheating of steam improved the thermal efficiency of the plant, net work output of turbine, reduction in blade erosion (or quality of steam improve). By regeneration thermal efficiency of the plant can be increased but it does not affect work output from turbine.

What is the difference between Rankine cycle and Brighton cycle?

Explanation: The difference between a Rankine cycle & a Brayton cycle is that the working fluid in a Brayton cycle doesn’t undergo phase change while it does in Rankine cycle. Explanation: For the production of power, the working fluid does some work on the blades of the turbine, thereby producing Power.

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What is the difference between an ideal and actual cycle?

The largest difference between the two diagrams is the simplification of the intake and exhaust strokes in the ideal cycle. In the exhaust stroke, heat Qout is ejected into the environment. In a real engine, the gas leaves the engine and is replaced by a new mixture of air and fuel.

What are the reason for modification of Rankine cycle?

This cycle is known as modified Rankine cycle. The reason for the early release is that at the lower pressure the specific volume of steam is high. In order to accommodate such rapidly expanding steam, large cylinder volume is necessary and the extra work obtained is very small.

What is regenerative Rankine cycle?

This section will introduce one such cycle – the ideal regenerative Rankine cycle, which increases the fluid average temperature during the heat addition process. This process is called regeneration and the heat exchanger where heat is transferred from steam to feedwater is called a regenerator, or a feedwater heater.

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Which is more efficient reheat cycle or the regenerative cycle?

Analysis shows that regenerative cycle is more efficient compare to reheat cycle for a given set of operating conditions.

What are the advantages of reheat cycle over simple Rankine cycle?

Advantages: The advantages of using a reheat cycle are higher thermal efficiency, reduced feed water pump power, smaller condenser, smaller boiler, long life of the turbine and less handling of the fuel and firing requirement.

What is Rankine cycle?

Rankine cycle is a mechanical cycle which is used to convert the pressure energy of steam into mechanical energy using turbines.

What is the purpose of modified Rankine cycle in steam turbine?

It reduces the volume of the condenser(i.e., material saving) by sacrificing small amount of work in the turbine. In modified Rankine cycle, steam is expanded to a pressure slightly less than the condenser pressure.

What is the net heat rejected in a Rankine cycle?

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The net heat rejected is given by Qre = H4 – H1 During a Rankine cycle, work is done on the fluid by the pumps between states 1 and 2 (isentropic compression). Work is done by the fluid in the turbine between stages 3 and 4 (isentropic expansion).

Why is a Rankine turbine more efficient than a Carnot engine?

Since Carnot’s principle states that no engine can be more efficient than a reversible engine ( a Carnot heat engine) operating between the same high temperature and low temperature reservoirs, a steam turbine based on the Rankine cycle must have lower efficiency than the Carnot efficiency.