Girl_Mark and Andreas,
I am 62 now and I think that I remember that I studied this some 50+ years ago. The change of solids to liquid to gas either needs a lot of energy or releases a lot of energy at the specific temperature/pressure points. . Think it was in the first classes in physics. You can write many books of its use by nature, i.e. transpiration, and even more about its engineering applications. You do not have to go further than to your kitchen, to get practical samples on its use in your Fridge/Deep freezer. Not water, but the same principles. That is why I was so enthusiastic about the use of solar panels for Air conditioning, in earlier postings, when somebody actually produced products. The more Sun/Heat the more capacity for AC. Hakan At 03:22 PM 5/22/2003 +0200, you wrote: >Mark, > >from my university time I remember the following: > >Heating by Oil is used when you want energy to be transferred with no or >low pressure and for temperatures not much beyond 250 - 300 Celsius (above >that it becomes either extremly expensive or you "crack" the teat transfer >oil). In addition you always have to do this in a closed loop because you >do not want to loose the oil (so leaks become a problem...). > >Steam / water is used because you transfer much more energy (usually the >steam is condensed to water at different pressures thus keeping an exact >temperature very accurately). Leaks are not such a big problem because you >only loose water. > >So far my memory... > > > >Andreas Ohnsorge > >CSC Ploenzke AG >Abraham-Lincoln-Park 1 >65189 Wiesbaden >Germany >Phone: +49.611.142.20020 >Fax: +49.611.142.980028 >Mobile:+49 172 - 8 43 30 32 >e-Mail: [EMAIL PROTECTED] >Internet: www.de.csc.com > >CSC ist offizieller IT-Supplier der Tour de France 2003. >Weitere Infos: www.csc.com/cycling > > >---------------------------------------------------------------------------------------- > >This is a PRIVATE message. If you are not the intended recipient, please >delete without copying and kindly advise us by e-mail of the mistake in >delivery. NOTE: Regardless of content, this e-mail shall not operate to >bind CSC to any order or other contract unless pursuant to explicit written >agreement or government initiative expressly permitting the use of e-mail >for such purpose. >---------------------------------------------------------------------------------------- > > > > > > > "girl_mark_fire" > > <wrench To: > biofuel@yahoogroups.com > @tinkersworkshop cc: > > .org> Subject: [biofuel] steam > versus oil heating for commercial plants > > > 22.05.2003 > 10:20 > > Please > respond > > to > biofuel > > > > > > > > > >I saw a heat exchange unit in Ames/Nevada Iowa last week that I forgot to >ask >the plant operators about: > The plant operated both a biodiesel pilot plant and several other biomass >pilot projects (the place is called BECON, do a search for > > BECON biodiesel > > to find a few websites that mention what they do, it';s a really neat >place. >They do pyrolysis, biodiesel, ethanol, mechanical soy oil extraction, >methane >digester (not operational at the moment), a gasifier, and maybe another >thing >or two. Anyone living in the area or driving through (I-35) should get in a >tour if >possible, it's very impressive) > >the facility uses natural gas to heat an oil-based heat exchange liquid, >which >then circulates around the facility and is used by it's various operations >(they >also use a diesel generator and I believe in the future might take on >cogeneration of heat but are not doing so at the moment) >This 'oil as a heat exchange medium' technology is apparently not uncommon >in factories. >It also seems that steam is another way to move the high temps that a >commercial bioenergy operation might need, and that the oil or steam are >the >two main options short of direct-flame heating which would probably not >find >much safe use in one of these operations... > >Does anyone know much about how the two technologies compare? why one >might choose one over another for a small plant (this facility can produce >500,000 gal BD per year in a 100 gallon batch processor, but the building >houses all those other projects, so the total energy needs are higher than >just >what the BD plant does...)? >The places where high heat is useful would be in assorted dewatering/ >distillation/glycerol processing projects... > >Also can anyone point me to actual manufacturers of modern equipment that >provides this technology, or what it is actualy called? > >thanks in advance, >mark ------------------------ Yahoo! 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