Quick Answer: What Is The Mean Temperature Of Heat Addition What Is Its Effect On Cycle Efficiency?

What is the basic principle of regeneration?

1.

What is the basic principle of regeneration.

Explanation: In regeneration steam from condenser is circulated through turbine to increase steam temperature before it enters boiler.

Explanation: Feedwater is preheated so as to decrease the fuel consumption which increases efficiency..

What is S in TS diagram?

A temperature–entropy diagram, or T–s diagram, is a thermodynamic diagram used in thermodynamics to visualize changes to temperature and specific entropy during a thermodynamic process or cycle as the graph of a curve. … Working fluids are often categorized on the basis of the shape of their T–s diagram.

What are power cycles?

Power cycles are cycles which convert some heat input into a mechanical work output, while heat pump cycles transfer heat from low to high temperatures by using mechanical work as the input. Cycles composed entirely of quasistatic processes can operate as power or heat pump cycles by controlling the process direction.

What is mean temperature of heat addition in Rankine Cycle?

In the Rankine cycle, the mean temperature at which heat is supplied is less than the maximum temperature, , so that the efficiency is less than that of a Carnot cycle working between the same maximum and minimum temperatures. The heat absorption takes place at constant pressure over , but only the part is isothermal.

What is the relation of the mean temperature of heat addition and cycle efficiency?

Explanation: As there is an increase in superheat at constant pressure, the cycle efficiency increases & hence there is an increase in the mean temperature of heat addition.

What is the purpose of reheat cycle?

The purpose of a reheating cycle is to remove the moisture carried by the steam at the final stages of the expansion process. In this variation, two turbines work in series. The first accepts vapor from the boiler at high pressure.

What are the four process of Rankine Cycle?

The ideal Rankine cycle consists of the following four processes, as shown on the T-s diagram on the left: 1-2: Isentropic compression in a pump. 2-3: Constant pressure heat addition in a boiler. 3-4: Isentropic expansion in a turbine.

Why don’t we use more than two reheats?

4. Why don’t we use more than two reheats? Explanation: The mechanical stresses increases in much higher proportion than the pressure because of the prevailing high temperature. Explanation: The cycle efficiency is a function of the ratio of reheat to initial pressure.

What is the effect of regeneration on mean temperature of heat addition in Brayton cycle?

Right Answer is: B Due to Regeneration, heat addition process (inlet to combustion chamber)starts at a temperature higher than the earlier whereas the exit temperature of the combustion chamber remains constant so the mean temperature(average) of heat addition increases.

How do you increase mean temperature of heat addition?

Explanation: Increasing condensor pressure decreases turbine exit temperature which in turn increases mean temperature of heat addition. 3.

How can you increase the thermal efficiency of a Rankine Cycle?

There are three ways to increase the efficiency of the simple ideal Rankine cycle.Decreasing the condenser pressure. The effect of lowering the condenser pressure on the Rankine cycle efficiency is illustrated on a T-s diagram on the left. … Superheating the steam to a high temperature. … Increasing the boiler pressure.

What is the reason behind the fact that the ideal regenerative cycle is practically not possible?

Explanation: For both the cycles, efficiency is given by 1 – (T2/T1). Explanation: These indiate that the ideal regenerative cycle is better than the Rankine cycle but it is not practicable. Explanation: These reasons result in the ideal regenerative cycle being not used practically. 7.

What process does Rankine cycle contain?

Explanation: Working fluid in Rankine cycle undergoes 4 processes, expansion in turbine, heat addition in Boiler, heat rejection in Condenser and compression in pump.

Why do we reheat steam?

The main purpose of reheating is to avoid excess moisture in steam at the end of expansion to protect the turbine. But it need not improve the cycle efficiency.

What is the meaning of reheating?

: to heat (something) again : to make (something) hot or warm once more reheating leftovers in the microwave.