Fwd to this list...pertaining to a thread at hand... Mike JAMAICA
----- Original Message ----- From: "WTCarey" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, October 14, 2005 11:25 PM Subject: [solar-ac] Re: Refrigeration compressor directly driven by small waterpowered turbine > In gerneral you wouldn't want to run a compressor continuously. Wear > and having to create a bypass system are the obvious issues. > > There are elctromagnetic clutches used on automobile compressors that > would fit the requirements. My impression is that they use a bit of > current to operate and may not be the most efficient type of clutch. > There are also a clutches made of a feroelastic solution. These > clutches slip when on current is applied but the feroelactic fluid > becomes a solid when a voltage is applied. They do require a slower > voltage ramp up than a switch. As I recall the original test clutch > broke the shaft of a small gas engine when the power was applied with > a switch. The clutch had zero slip. > > In gereral, the start up torque for a compressor is not very high > compared to tthe full load torque because the pressures in a cooling > system equalize a few minutes after the compressor is turned off. > That is why most A/C systems wait a few minutes before they restart > if you move the thermostat to a lower setting just after it has shut > off. > > Sounds like you have a pretty good match for your water turbines to > me. > > Someone else here can give you a better estimate of power > requirements, but I think that a small automotive A/C system could be > used directly with your turbine. You don't say what the output RPM > is, so that need to be considered. My auto A/C is happiest above 1500 > PRM but that does not take into account any RPM gain due to pulley > size differences. > > Good Luck. This sounds very interesting. > > > start-up torque. >> Our turbines are designed for directly driving >> machines and have a manual on/off power control >> switch. >> Is it practical to run compressors continuously? What >> about electric clutches? Are there compression >> releases for easy start-up like chainsaws have? >> We were thinking that perhaps 1.5--2.5 h.p. would be >> sufficent. Is that realistic? >> >> Ron Davis, [EMAIL PROTECTED] >> >> >> >> >> >> __________________________________ >> Yahoo! Mail - PC Magazine Editors' Choice 2005 >> http://mail.yahoo.com >> > > > > > > > > Archives of solar-ac messages are at: > http://groups.yahoo.com/group/solar-ac/messages > > Yahoo! Groups Links > > > > > > > ------------------------ Yahoo! Groups Sponsor --------------------~--> Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/FGYolB/TM --------------------------------------------------------------------~-> Does your company feature in the microhydro business directory at http://microhydropower.net/directory ? If not, please register free of charge and be exposed to the microhydro community world wide! NOTE: The advertisements in this email are added by Yahoogroups who provides us with free email group services. The microhydro-group does not endorse products or support the advertisements in any way. More information on micro hydropower at http://microhydropower.net To unsubscribe: send empty message to [EMAIL PROTECTED] Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/microhydro/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
