Solar thermal? IMO Brayton cycle is nice because you can use air and leaks are just lost efficiency but not something you go offline for.
There is a company making a compressor for Harley Davidson motorcycles that is about right size for a home unit. It has variable pitch which is novel. Bearings need study but I still think it is interesting. Kirk -----Original Message----- From: robert luis rabello [mailto:[EMAIL PROTECTED] Sent: Thursday, June 21, 2001 11:53 PM To: biofuel@yahoogroups.com Subject: Re: [biofuel] R-11, R-12, R-13 (?) synthesis kirk wrote: > Marc-- these compounds have precursors that are deadly. > > -----Original Message----- > From: F. Marc de Piolenc [mailto:[EMAIL PROTECTED] > Sent: Thursday, June 21, 2001 8:22 PM > To: Biofuel List > Subject: [biofuel] R-11, R-12, R-13 (?) synthesis. > > Hydrogen fluoride forms hydrofluoric acid upon contact with moisture and > will dissolve glass. It will eat your lungs in a few seconds at most. > It is an extremely reactive gas and wants to combine with almost everything. > Even CCl4 is dangerous. It will disassociate about 1% if placed in an > ultrasonic cleaner-- the poison being phosgene, a deadly neurotoxin. > Even freon when subjected to enough heat such as a cigarette will form toxic > products. > R12 flowing through a hot copper tube (happens when brazing on system) is > something you shouldn't breathe. > All the original chemists who worked with fluorine died before they were 50. > And they had vent hoods etc. and were trained professionals. > Be very very careful. > > Kirk I spoke with a local refrigeration man about my current project--an organic rankine cycle expander using an automobile scroll compressor (the only part of a Stealth I'll ever own!) and something like propane as its working fluid. The man told me that this was not a wise idea, as propane is flammable, and proceeded to tell me about several recent accidents in the "oil fields" where propane is used as a refrigerant. I responded: "I'd rather ask a stupid question than make a stupid mistake. . ." All of these compounds are fraught with risk to some extent. (Ok, I'll avoid propane, but where can I get something like R 124, or R 134? (note, NOT 134a)) Your admonition to be careful is good advice! After all, even steam is dangerous. . . 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/ --- Incoming mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.256 / Virus Database: 129 - Release Date: 5/31/2001 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.256 / Virus Database: 129 - Release Date: 5/31/2001 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/
