Sage-Tips

How does reheating and intercooling effect the efficiency of the gas turbine cycle?

Therefore, a reheat cycle is used to increase the work output while a regenerative cycle is used to enhance the efficiency. The cooling of air between two stages of compression is known as intercooling. The loss in efficiency due to intercooling can be remedied by employing exhaust heat exchange as in the reheat cycle.

What are the effects of intercooling and regeneration on the work output and efficiency of gas turbine?

Intercooling between the stages in the compressor leads to a decrease in the compressor work input therefore it will also help to increase the work ratio of the gas turbine plant resulting in a decrease in the thermal efficiency, but the scope of regeneration will increase.

How does intercooling increase efficiency?

Intercoolers increase the efficiency of the induction system by reducing induction air heat created by the supercharger or turbocharger and promoting more thorough combustion. A decrease in intake air charge temperature sustains use of a more dense intake charge into the engine, as a result of forced induction.

What does reheating in a gas turbine do?

Effect of reheating: This increases the work output of the turbine by keeping the compressor work constant. The mean temperature of heat rejection is also increased, resulting in a decrease in the thermal efficiency of the plant. For a given power output, the fuel consumption rate decreases.

What is effect of reheat and regeneration on efficiency?

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 effect of reheat on the specific output?

Explanation: Reheat increases work output.

How effective is reheating and regenerating in improving working characteristics of the system?

A comparison study between the regular reheat regenerative cycle and the invented cycle is done. The results indicate that a gain in efficiency of up to 2.5\% is obtained when applying invented cycle at the same conditions of pressure, temperatures, number of reheating stages, and feed water heaters.

What is the effect of reheating on network and efficiency of Rankine cycle?

Fig. 7: The ideal reheat Rankine cycle. The incorporation of the single reheat in a modern power plant improves the cycle efficiency by 4 to 5 percent by increasing the average temperature at which heat is transferred to the steam.

How does reheating increase efficiency?

In case of two reheats, steam is super-heated twice at different constant temperatures. A high reheat pressure increases the the moisture content at turbine exhaust which results in scaling and it should be optimised. Thus the work produced is increased ,thereby efficiency increases.

Does reheat increase efficiency?

A high reheat pressure increases the the moisture content at turbine exhaust which results in scaling and it should be optimised. Thus the work produced is increased ,thereby efficiency increases.

Can intercooling and reheat increase the thermal efficiency of a turbine?

By itself, they would not necessarily increase the thermal efficiency, however, when intercooling or reheat is used in conjunction with heat regeneration, a significant increase in thermal efficiency can be achieved and the net work output is also increased. This requires a gas turbine with two stages of compression and two turbine stages.

What is rereheat and intercooling?

Reheat and intercooling are two such schemes. The basic objective of introducing intercooling and reheat is to increase specific power and thermal efficiency. When comparing ideal and real cycles, the largest sources of loss in a gas turbine engine are those arising from the turbomachinery and the need to cool the turbine blades.

What is intercooling in thermodynamics?

Intercooling additionally includes the utilization of a heat exchanger. The intercooler is a type of heat exchanger where it is used to cool the compressor gas amid the compression process. Reheating in thermodynamic process refers to an approach to build turbine work without variation in the compressor work from which the turbine is developed.

What is the regeneration process in a gas turbine?

The regeneration process occurs between the stages of turbine and pump respectively. Using regeneration, the efficiencies of thermodynamic cycles can be improved. Show the schematic diagram of a gas turbine engine with two-stage compression with intercooling, reheating, and regeneration in figure (1).