Lec-22 Vapor Power Cycle-III

Lecture Series on Basic Thermodynamics by Prof.S.K. Som, Department of Mechanical Engineering, IIT Kharagpur. For more details on NPTEL visit nptel.iitm.ac.in

[@AjeetKumar-oo7bc]

Best teacher of thermodynamics in india....

[@shekharsiddharth7827]

life lesson: we should focus on efficiency and not on the output...:D

[@challakishore6975]

haha yeah.lesson learned

[@HemantKumar-cr2eh]

But u should also known that what is your therotical max efficiency and practical efficiency

[@ankursrivastava9074]

I am observing as lecture series is going onwards no of comments is reduced hmmmm.....

[@yashsehgal5883]

u r very hard working sir.thanks for this lecture

[@gollavillihari2516]

beauty lies from 41:18to 52:53

[@pradeeppadala5820]

are u hari from gitam mech

[@amansonkar2166]

Concept of regeneration 18:01

[@gollavillihari2516]

simply superb.concept cleared

[@primaryhealthcentremori2915]

rey golla ni over action aapara

[@manojsharma9814]

yes dryness fraction reduces but its a ideal process.....

[@Exam_Watch]

35:45 IITians behave yourselves.

[@manojsharma9814]

this is one of the condition for carnotising.....if your turbine component withstand at this dryness fraction.......

[@adarsh7307]

one of the best lecturesssss

[@sayanray3638]

I have a question the heat interaction between steam and water flow is internally accomplished... There is no heat interaction with ambient. In this situation expansion of steam should also be isentropic. Please corret me if I am wrong???.

[@sanjayjetani7067]

In a regeneration cycle.. what about the dryness fraction of steam in turbine.. it is decreased as shown in diagram.?

[@lokeshverma5902]

i guess we implicitly assume that whatever dryness fraction the wet steam has acquired is more than the limit prescribed

[@mriganksharma7809]

thanks sir,you saved me

[@arkitkabir6950]

Why is regeneration cycle not used for super-heated steam?

[@diwakarkumar2250]

What is the effect of ideal regeneration on turbine work?

[@Enigma_pk]

Will the carnotizing process decrease the life of turbine

[@riturajanand7133]

can anyone tell me like what is the practical temperature (generally we find) when the working fluid passes the "feed pump"...And we all know steam turbine entry temperatures are typically around 565 °C ...please mention what is the temperature (we get) after feeding working fluid into feed pump, as it is isentropic compression process?

[@abrahamkassahun5847]

I don't know about actual plants, but if you look at a compressed liquid water table, you see that the temperature rise is negligible, only a few degrees even when the pressure rise is something like 500bar.

[@raghavaggarwal5412]

Thank you sir

[@mmoore9954]

26:58

[@mmoore9954]

9:32

[@prashikbhagat]

Doesn't dryness coefficient reduce after regeneration???? anyone explain

[@akashmandloi]

yes it does the dryness fraction reduces after regeneration as the temperature drops of the steam the moisture content increases....

[@shubhamchaudhari9149]

but sir told in last class that that dryness fraction cannot go below certain limit i.e 0.85.And he told various reasons fir that.But here it seems to be reduced a lot.I am confused ?

[@shashu990]

Shubham Chaudhari that is why regenerative reheat cycles are used

[@shivanshukesharwani2447]

Yes you are right, the dryness fraction gets reduced which isn't a good sign for the low pressure end of turbine, but again that's the case with an ideal Carnotised Rankine cycle. In actual practice, the process isn't isentropic and some amount of entropy is always generated in the steam turbine, so that the actual expansion line deviates a bit towards right, compensating for the reduced dryness fraction by a certain amount.

[@akashanand1329]

abhu bhi chahiye kya explanation ya moh maya se bahar nikal gaye ho