Hi Richard,
I agree with you as long as you are talking heat transfer applications. But in an isentropic (constant entropy) expansion, such as occurs in a steam turbine, a phase change from vapor to liquid can spell death to the turbine. Often the steam is reheated along the way, just to prevent "wet" steam. I only mention this because probably 95% of grid energy is the result of a steam turbine driving a generator. Best regards, Mark From: Gasification [mailto:[email protected]] On Behalf Of Richard Bockwinkel Sent: Monday, February 4, 2013 5:25 PM To: Toby Seiler; Discussion of biomass pyrolysis and gasification Subject: Re: [Gasification] sexy steam OK...I have been monitoring this group for quite some time...and I have to concur with Toby...and add... STEAM...is like Dr. Pepper...paraphrasing...'MIS UNDERSTOOD"... Phase change is the POWER and VALUE of "water"...er...vapor...er...ice...er STEAM... great illustration of the power of phase change... http://www.youtube.com/watch?v=pOYgdQp4euc Richard Bockwinkel On Feb 4, 2013, at 4:15 PM, Toby Seiler wrote: "steam is definitely not sexy in the renewable energy world". Go back to the "Stanley Steamer" and study the boiler. I think about 1500 of them were sold and there were no boiler explosions (that I found). When checking with Kennedy Tank, a similar boiler can be made using todays materials. From my research, it is the verticle firetube (and a lot of them) that is key, since the temperature has limits as long as it has ANY water in it. My boss at Bryan Steam was the ASME Section 7 Chairman for many years (in 1978) and they had built a steam car (around 1900) that we often discussed. He assured me steam would be back to "sexy" and I still believe this to be true, if one chooses a design that is inherently safer. Stanley Steamer held the world land speed record for a very long time (untill recently). That boiler was rated at 600psi but my guess is, at the speed record attempt they were well over 1000-1200f. There is a lot of stored energy in water that is not yet steam (due to pressure) and I often wonder about injecting super heated water into an engine, taking advantage of the 1600x expansion, liquid to vapor. _______________________________________________ Gasification mailing list to Send a Message to the list, use the email address [email protected] <mailto:[email protected]> to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/gasificatio n_lists.bioenergylists.org for more Gasifiers, News and Information see our web site: http://gasifiers.bioenergylists.org/
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