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Organic Rankine Cycle

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Energy From Thorium Discussion Forum :: View topic - Supercritical CO2 Closed-Cycle Gas Turbines 7/22/10 9:55 PM

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Supercritical CO2 Closed-Cycle Gas Turbines

http://www.energyfromthorium.com/forum/viewtopic.php?f=17&t=834

Author: Kirk Sorensen [ Jul 18, 2008 10:52 am ]

Post subject: Supercritical CO2 Closed-Cycle Gas Turbines

I didn't see a thread on this subject, so I thought I'd start one.

Page 1 of 5

The supercritical CO2 cycle is intriguing. The basic advantage of the approach is that it is easiest to compress a gas when it's dense, and CO2 near the critical point has some really nice advantages. I've been reading more and more on this cycle recently and wondering if it is advantageous over an ideal-gas Brayton cycle using helium.

Much of the recent work in this field was done by Dr. Vaclav Dostal, who was a student at MIT but is now a professor at the Czech Technical University. Here is a link to his dissertation:

http://dspace.mit.edu/handle/1721.1/17746

Author: Cyril R [ Jul 18, 2008 1:06 pm ]

Post subject: Re: Supercritical CO2 Closed-Cycle Gas Turbines

I've linked to that study a few days ago in the thread about effects of lowering peak salt temp.

Benefits are obvious:

- in the right supercritical regime, higher efficiency with lower temps

- more compact than helium cycles

- can be more simplified than helium cycles

- CO2 is much less prone to creeping and leaking than helium, it's easier to contain which allows lower cost simplified equipment (bearings, valves, connectors etc)

- CO2 is abundant and easy to obtain (not that I think helium shortage will occur - the amounts required are relatively low).

Author: David [ Jul 22, 2008 4:50 pm ]

Post subject: Re: Supercritical CO2 Closed-Cycle Gas Turbines

Kirk,

http://www.energyfromthorium.com/forum/viewtopic.php?f=17&t=834&...0&st=0&sk=t&sd=a&sid=da95f084ba95e91cffa0a8ae5401ff6f&view=print Page 1 of 8

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