Another Level of Carnotization of Rankine Model

P M V SubbaraoProfessor

Mechanical Engineering DepartmentI I T Delhi

More Efforts to Realize Isothermal Heat Addition…..

C

C

CC

Reassessment Thru Carnot Model

Relative Benefits from remaing action

0

500

1000

1500

2000

2500

3000

3500

0 2 4 6 8 10 12 14 16p, MPa

hs &

wt

h3

Possible efficiency

0

0.1

0.2

0.3

0.4

0.5

0 2 4 6 8 10 12 14 16

p, MPa

Eff.

s

Non-Isentropic Expansion !!!

A Macro Carnot Cycle !!!!

Ideal Regenerative Cycle

Regenerative Turbine

Regenerative heat transfer. Change in kinetic and potential energies are negligible

3

4

T

inin mmCMSSSF ::

CVout

outin

inCV WgzVhmgzVhmQ

22

CVoutoutininREGEN WhmhmQ

ssuming a single fluid entering and leaving…

2374 hhmhhmhhmQW outinREGENCV

REGENQ

Analysis of Regeneration Cycle

s

12

2374

17

34

hhmW

hhhhmW

hhmQ

hhmQ

pump

turbine

out

in

additionHeat of Rate

outputPower Net cycle theof Efficiency

34

17

34

1734 1hh

hh

hhm

hhhhm

in

net

Q

W

smS

Analysis of Rankine Cycle with FWH

P M V SubbaraoProfessor

Mechanical Engineering Department

I I T DelhiEngineering solution to Pure Thoughts ..…..

Regeneration Cycle with Open FWH

’

212111 smSsmS

mixmix smSS 23

515616 smmSsmmS mixmix

55'6 smSS mix

S

5smmix

1m

Synthesis of Rankine Cycle with OFWH

5

p2=p6