A Throttling Process On Mollier's Diagram Is Represented By

Figure 19a shows a Mollier diagram representing the expansion process through an adiabatic turbine. The throttling process is one of the isenthalpic processes.

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On Mollier chart free expansion or throttling process from high pressure to atmosphere is represented by_____.

A throttling process on mollier's diagram is represented by. Actual expansion of steam always involves some losses represented by an increase in entropy. Mollier is often referred to as. The simplest and most direct way to understand the principle is to use a Mollier Diagram or a T-S Diagram.

The slope of the arrows represent how efficient the turbine is. At 42C Sf 05987 kJkgC and 8fg 76222 kJkgC. The enthalpy- entropy charts in Appendix B are Mollier Diagrams.

In the 5AT FDCs Wardale gives examples of this for instance in lines 68 to 84 of FDC 13 where he calculates the isentropic efficiency of the 5AT at maximum drawbar power. A throttling process is a thermodynamic process in which the enthalpy of the gas or medium remains constant h const. A Horizontal straight line.

The entropy before the expansion is equal to the entropy after the expansion. Enthalpy Entropy Diagramor Enthalpy Entropy Chart. A horizontal slope is a throttling process whereas a vertical slope is 100 isentropic efficiency.

Valve gear at the inlet to the HP and IP turbines is used to control the inlet mass flow and hence the load on the machine by a throttling process. Mollier diagram is a h-s plot. The turbine process on a Mollier diagram.

On Mollier chart free expansion or throttling process from high pressure to atmosphere is represented by AHorizontal straight line BVertical straight. During the throttling process no work is done by or on the system dW 0 and usually there is no heat transfer adiabatic from or into the system dQ 0. I hope this helps to explain the processes to you.

It may also be used quantitatively for various calculations. Horizontal straight line b. Using Table 1 Sg at 186C 65346 kJkgC.

On Mollier chart free expansion or throttling process from high pressure to atmosphere is represented by. None of the above. It can be used to depict the various processes associated with the tur bine set.

ENTROPY THROTTLING MOLLIER DIAGRAM 1. On Mollier chart free expansion or throttling process from high pressure to atmosphere is represented by A. 8g186 842 q8fg42 65346 05987 q x 76222 59359 q q x 76222 59359 76222 2.

The ordinate and abscissa are respectively. Figure 141 shows a Mollier diagram comparing the condition lines of a reheat turbine at full load with all the valves wide open and one at part load where the load has been reduced by 40 by throttling on the inlet valves to the HP. The throttling process takes places with enthalpy remaining constant.

On Mollier chart free expansion or throttling process from high pressure to atmosphere is represented by LMTD in case of counter flow heat exchanger as compared-to parallel flow heat exchanger is Presence of frictional effect during flow through the nozzle. On Mollier chart free expansion or throttling process from high pressure to atmosphere is represented by. As shown on the accompanying p v diagram state 1 is in the two.

The given diagram shows the throttling process of a pure substance. Ideal isentropic expansion is represented on the Mollier diagram by a vertical line. Mollier diagram is a graphical representation of a functional relationship between enthalpy entropy temperature pressure and quality of steam.

Lets make two assumptions to help clarify the. For a throttling process the energy and mass balances reduce to give h 2 h 1 Thus with state 2 fixed the specific enthalpy in the supply line is known and state 1 is fixed by the known values of 1 p and h 1. Slopes in between obviously are something less than 100.

Mollier diagram showing a typical expansion process Stagnation state is represented by state parameters designated as P 0 for stagnation pressure T 0 for stagnation temperature and h 0 for stagnation enthalpy. B Vertical straight line. From high pressure to the atmosphere is represented by.

On Mollier chart flow through turbine is represented by In a throttling process The dry saturated steam at very high pressure 150-200 kgcm2 when throttled to atmosphere will become. Follow the process through the Diagram and you will become aware of what is truly taking place. QUESTION 8 On a Mollier diagram show all the stagnation and static points required to represent the complete flow process in a diffuser Air enters a diffuser with an average velocity of 375 ms at a temperature of 360 kPa and 470 K respectively and leaves at a stagnation pressure of 300 kPa with an average velocity of 120 ms and a static pressure of 280 kPa.

The throttling process undergone by a gas across an orifice is shown by its states in the following figureabcdCorrect answer is option D. Stagnation pressure is a pressure at a state corresponding to zero velocity a stagnation state which is representative of an adiabatic throttling process. Line 12 represents the actual expansion and line 12 s the ideal or reversible expansion.

Your consideration of Mollier diagrams in this course will be limited to a qualitative look at the turbine set. This process may be represented by the line AB on the Mollier diagram. Now the change of enthalpy total heat during this process may be found out by the difference between the initial enthalpy of 2250 kJkg and the final enthalpy obtained by drawing a horizontal line through B.

D None of these. On Mollier diagram free expansion or throttling process. The arrows represent the before and after modification paths of the turbine on the Mollier diagram.

The diverted steam undergoes a throttling process. Mollier Diagrams The Mollier diagram is a very useful tool. The fluid velocities at entry to and exit from a turbine may be quite high and the corresponding kinetic energies significant.

This process on TS diagram is represented by a line starting diagonally from top to bottom. This is not true in an adiabatic process carried out irreversibly. This process on TS diagram is represented by a line starting diagonally from top to.

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