There';s been a great series in Home Power magazine in the last few issues about domestic soolar hot water, including some heat exchange stuff. It's a good primer to what we're doing with heat exchangers.
That said, most heat exchangers are made of copper, which we should stay away from for biodiesel processing as it decreases storage stability of the product (in a few hours of contact when heated I believe). Use stainless steel if possible )I got some stainless tubing designed as a liquid-to-liquid heat exchanger, from a specialty refrigeration application). On the other hand most homebrewers don't have biodiesel sitting around (other than Pieter who stores his for a year before using) for long periods of time so maybe that's not as big of an issue. We usualy just don't produce all that much of it at once so in our area at least (where there's a homebrewer community and high demand!) it tends to get used up fairly rapidly. When biodiesel breaks down over time some of the byproducts released include acids (acetic and formic I believe) which can do some serious damage to fuel injection equipment. ONe of themoderators of biodieselnow.com just had a very expensive injection pump failure which looked like rust formation. This was with improperly stored commercial World Energy (ie soy, I believe in his area) biodiesel. There's no way to know for sure but this is definitely a possibility if you're running stuff that starts to break down. The other storage stability issue is polymerisation which is more like running improperly designed SVO, so you want to avoid both of these problems. I can't remember offhand which problem copper catalyses (I think it's oxidation), so sorry I don' thave better information. mark --- In biofuel@yahoogroups.com, "William Clark" <[EMAIL PROTECTED]> wrote: > Hello to all, > > Would Todd or some other send a description of a closed loop heat exchanger? > I would greatly appreciate it. > > Bill Clark > ----- Original Message ----- > From: "Keith Addison" <[EMAIL PROTECTED]> > To: <biofuel@yahoogroups.com> > Sent: Monday, October 27, 2003 3:07 AM > Subject: Re: [biofuel] open flame heat sourses (was: aaron--don't do it) > > > > Hi Aaron > > > > >Todd: Of course I would use a closed loop heat exchanger. Good call on > the > > >differences of wood flames a ------------------------ Yahoo! Groups Sponsor ---------------------~--> Buy Ink Cartridges or Refill Kits for your HP, Epson, Canon or Lexmark Printer at MyInks.com. Free s/h on orders $50 or more to the US & Canada. http://www.c1tracking.com/l.asp?cid=5511 http://us.click.yahoo.com/mOAaAA/3exGAA/qnsNAA/FGYolB/TM ---------------------------------------------------------------------~-> Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Biofuels list archives: http://archive.nnytech.net/ 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/
