What is a Rankine cycle process?

The Rankine cycle is an idealized thermodynamic cycle describing the process by which certain heat engines, such as steam turbines or reciprocating steam engines, allow mechanical work to be extracted from a fluid as it moves between a heat source and heat sink.

Which processes do the Rankine cycle contain 1 point?

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

What are the four processes of Rankine cycle?

1-2: Isentropic compression in a pump. 2-3: Constant pressure heat addition in a boiler. 3-4: Isentropic expansion in a turbine. 4-1: Constant pressure heat rejection in a condenser.

What is the other name of Rankine cycle?

The Rankine cycle, also called the Rankine vapor cycle, is a thermodynamic cycle that converts heat into mechanical energy. The Rankine cycle is name after William Johnson Macquorn Rankine, a 19th century Scottish engineer and physicist known for his research in the thermodynamic properties of steam.

Why is the Rankine cycle important?

The efficiency of the Rankine cycle is limited by the high heat of vaporization by the fluid. This waste heat is necessary in any thermodynamic cycle. Due to this condensation step, the pressure at the turbine outlet is lowered.

What type of process is the ideal Rankine cycle?

Explanation: Ideal Rankine Cycle is a reversible process. Explanation: For analytical purposes, always steady flow operation is considered, as in unsteady flow, the various fluid properties vary considerably which remain same when the steady flow operation is assumed.

Why is the Rankine cycle modified?

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 uses the Rankine cycle?

The Rankine cycle or Rankine Vapor Cycle is the process widely used by power plants such as coal-fired power plants or nuclear reactors. In this mechanism, a fuel is used to produce heat within a boiler, converting water into steam which then expands through a turbine producing useful work.

What is the purpose of Rankine cycle?

Why do you need a condenser in a Rankine cycle?

Originally Answered: Why is a condenser used in a Rankin cycle? A condenser is used to convert the steam from the exit of the turbine to saturated liquid. This is done so that we can use a pump to pressurize the liquid. There is no mechanical device till date which can work on steam+liquid mixture.

What is the function of boiler in Rankine cycle?

The Rankine cycle system consists of a pump, boiler, turbine, and condenser. The pump delivers liquid water to the boiler. The boiler heated by the solar heat converts water to superheated steam. This steam is used to run the turbine which powers the generator.

Why Rankine cycle is less efficient than the Carnot 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 are four major components of the Rankine cycle?

Pump: Compression of the fluid to high pressure using a pump (this takes work) ( Figure 2: Steps 3 to 4) Boiler: The compressed fluid is heated to the final temperature (which is at boiling point), therefore, a phase change occurs-from liquid to vapor. Turbine: Expansion of the vapor in the turbine.

What are the assumptions for ideal Rankine cycle?

An Ideal Rankine High Pressure (15MPa) Steam Power Cycle Assuming both turbines are isentropic (adiabatic and reversible), and neglecting kinetic energy effects we use the steam tables to determine the combined work output of both turbines. In this ideal cycle we assume that the feedwater pump is isentropic. The total heat transfer to the boiler, including the reheat system:

How can we increase the efficiency of Rankine cycle?

Alternative way of increasing the Rankine cycle efficiency is by increasing the boiler operating pressure and thus in a way related with the temperature at which boiling is taking place in the boiler. Thus the thermal efficiency of the cycle increases.