To determine The thermal efficiency of vapor power cycle. Explanation The following Figure-(1) shows the T − s diagram for vapor power cycle. Figure-(1) In Figure -(1), the process 3-4 shows the work done by pump, the process 4-1 shows the constant pressure heat addition in steam generator, the process 1-2 shows the expansion in turbine and process 2-3 shows the heat rejection in condenser. Calculate thermal efficiency. η = ( h 1 − h 2 ) − ( h 4 − h 3 ) ( h 1 − h 4 ) (I) Here, thermal efficiency η , enthalpy at state 1 is h 1 , enthalpy at state 2 is h 2 , enthalpy at state 3 is h 3 and enthalpy at state 4 is h 4 , The process 1 − 2 is isentropic process. The entropy at state 1 is equal to entropy at state 2 . Write the expression for dryness fraction at state 2 . s 1 = s f 2 + x 2 ( s g 2 − s f 2 ) s 1 − s f 2 = x 2 ( s g 2 − s f 2 ) x 2 = s 1 − s f 2 ( s g 2 − s f 2 ) (II) Here, dryness fraction at state 2 is x 2 , entropy of saturated liquid at state 2 is s f 2 and entropy of saturated vapor at state 2 is s g 2 . Write the expression for enthalpy at state 2 . h 2 = h f 2 + x 2 ( h g 2 − h f 2 ) (III) Here, the enthalpy at state 2 is h 2 , enthalpy of saturated liquid at state 2 is h f 2 , enthalpy of saturated vapor at state 2 is h g 2 . Conclusion: Refer to Table A-4 “Properties of superheated water”. to obtain enthalpy ( h 1 ) as 3809 kJ/kg and entropy ( s 1 ) as 6.7993 kJ/kg ⋅ K . Refer to Table-3 “Properties of saturated water” to obtain entropy of saturated liquid ( s f 2 ) as 0.8320 kJ/kg ⋅ K , entropy of saturated vapor ( s g 2 ) as 7.9085 kJ/kg ⋅ K , enthalpy of saturated liquid ( h f 2 ) as 251

8th Edition

ISBN: 9781119391630

Author: MORAN

Publisher: WILEY

See similar textbooks

Concept explainers

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. T…

Videos

Question

Chapter 6.13, Problem 133P

To determine

The thermal efficiency of vapor power cycle.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Chapter 6.13, Problem 132P

Chapter 6.13, Problem 134P

Students have asked these similar questions

A direct extrusion operation produces the cross section shown in Fig. (2) from an aluminum billet whose diameter 160 mm and length - 700 mm. Determine the length of the extruded section at the end of the operation if the die angle -14° 60 X Fig. (2) Note: all dimensions in mm.

For hot rolling processes, show that the average strain rate can be given as: = (1+5)√RdIn(+1)

: +0 usão العنوان on to A vertical true centrifugal casting process is used to produce bushings that are 250 mm long and 200 mm in outside diameter. If the rotational speed during solidification is 500 rev/min, determine the inside radii at the top and bottom of the bushing if R-2R. Take: -9.81 mis ۲/۱ ostrar

Chapter 6 Solutions

FUND OF ENGINEERING THERMO W/WILEY PLU

Ch. 6.13 - Prob. 1E Ch. 6.13 - Prob. 2E Ch. 6.13 - Prob. 3E Ch. 6.13 - Prob. 4E Ch. 6.13 - Prob. 5E Ch. 6.13 - 6. Is entropy produced within a system undergoing...Ch. 6.13 - 7. When a mixture of olive oil and vinegar...Ch. 6.13 - Prob. 8E Ch. 6.13 - Prob. 9E Ch. 6.13 - 10. Is Eq. 6.51a restricted to adiabatic processes...

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.