I know the chimney needs hot gases to work, Since it is reduced density generating the needed lift it seems to me you could use a well insulated stack and extract the heat at the last moment. If you want to discuss it on micro cogen it is fine with me. Cogen is cogen. I just advocate diesel because it is off the shelf and top efficiency.
I suppose there would be lots of problems powering a Brayton cycle with wood. Charcoal might be ok but I think wood has lots of goop problems. I suppose your wood heated closed cycle is a reasonable compromise. Kirk ----- Original Message ----- From: "robert luis rabello" <[EMAIL PROTECTED]> To: <biofuel@yahoogroups.com> Sent: Wednesday, February 20, 2002 10:52 PM Subject: Re: [biofuel] Making Something From Nothing > > > Keith Addison wrote: > > > (this is actually robert's comment from a previous post) > > >I'm working on > > >a cogeneration scheme for my wood stove to increase the efficiency > > >of my "biofuel" > > >resource. (And no, it's not going very well!!!) > > to which Keith responded: > > > Do you know Kirk's group? > > > > [EMAIL PROTECTED] > > > > http://groups.yahoo.com/group/Micro_Cogeneration > > Yes. I'm on his list. (As well as solar concentrator, distillers, > gasification and others. . .) Kirk has a good resource developing, but the main > thrust seems to involve diesel gen sets. My project is a scroll expander driven by > refrigerant gas, and I've had no end of headache getting it off the ground. I've > done this sort of thing with steam in the past, but I wanted something operating at > lower temperatures, so I could use hot water to drive the cycle (a "topping system" > is what I had in mind--take the first 10 degrees C off of a water tank heated by my > wood stove for the expander, then pipe the rest to the domestic supply), while > condenser waste supplied "pre heated" water for the hot side. With such a system, > flat plate solar panels could generate the required heat on the rare occasions when > the sun shines around here. . . > > It's a great idea on paper. I have a scroll expander, assorted plumbing, > valves and gauges, but the system pump, acquiring the refrigerant (I want to use R > 124, or R 134--not 134a!), and eliminating oil (which the scroll needs in order to > seal) and air from the lines have proven more problematic than I imagined. I could > use methanol, but I really don't want to vaporize anything that can kill me or my > family if it leaks! > > My long suffering wife is waiting for me to lose heart and abandon the project. > . . > > However, I'm rather determined to increase my level of independence. The > amount of wood I cut each year should be able to heat my house, all my domestic hot > water and provide a couple of kilowatt hours of electricity. The fact that so much > energy races up the stack to heat the sky simply bothers me. I know the chimney > needs hot gases to work, but the temperature gauge on the flue indicates that more > is heating the sky than is necessary. I'd really like to collect, cut, stack, burn > and waste less. > > But my garden LOVES the ashes! > > robert luis rabello > > > > > Biofuel at Journey to Forever: > http://journeytoforever.org/biofuel.html > Please do NOT send "unsubscribe" messages to the list address. > To unsubscribe, send an email to: > [EMAIL PROTECTED] > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ > > > ------------------------ Yahoo! Groups Sponsor ---------------------~--> Get your FREE credit report with a FREE CreditCheck Monitoring Service trial http://us.click.yahoo.com/ACHqaB/bQ8CAA/ySSFAA/FGYolB/TM ---------------------------------------------------------------------~-> Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Please do NOT send "unsubscribe" messages to the list address. To unsubscribe, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
