Go Back   Physics Help Forum > College/University Physics Help > Advanced Thermodynamics

Advanced Thermodynamics Advanced Thermodynamics Physics Help Forum

LinkBack Thread Tools Display Modes
Old Dec 1st 2016, 04:19 PM   #1
Junior Member
Join Date: Dec 2016
Posts: 1
Steam Turbines..

Steam is expanded from 90 bar, 412°C to 4.5 bar saturation in a high pressure turbine, after-which a certain percentage of the steam is bled off to a feed heater. The remaining steam is then expanded through a low pressure turbine to 1.0 bar and dryness fraction of 0.93. All ‘steam’ entering the feed pumps shall be a saturated fluid. Produce a schematic diagram of the system, together with appropriate T-s diagram. Using steam tables only, calculate

a)the isentropic efficiencies of both turbines
b)the percentage of steam bled of to the feed heater
c)the power generated by the turbines per unit mass of steam leaving the boiler
d)the energy available for low grade heating from the condenser

Neglect feed pumps and state any assumptions made

For question a) i have the following working, however im not sure if its correct Isentropic Efficiency = (h1-h2/h1-h2s)
= (3152-2745)/(3152-2525)
= 0.6491
Isentropic Efficiency for high pressure turbine= 65%

As for the other 3 questions, they have my stumped, im not even sure where to start. I cant find any equations online. Any help in being pushed in the right direction would be greatly appreciated.
Thanks in advance.
PieD94 is offline   Reply With Quote

  Physics Help Forum > College/University Physics Help > Advanced Thermodynamics

steam, turbines

Thread Tools
Display Modes

Similar Physics Forum Discussions
Thread Thread Starter Forum Replies Last Post
Need help calculating steam pressure... JMack52 Advanced Thermodynamics 1 Feb 15th 2011 11:02 AM
Steam turbine help please! philn Thermodynamics and Fluid Mechanics 0 Jan 27th 2010 05:33 PM
Steam throttling & mixing Simma Advanced Thermodynamics 0 May 15th 2009 01:35 PM
steam tables phases jarednjames Thermodynamics and Fluid Mechanics 2 May 13th 2008 11:56 AM

Facebook Twitter Google+ RSS Feed