> BTW, model airplane builders sometimes use plastic soda bottles for pressure > accumulators to operate retractable gear. They burst about 150 psi. Of > course they will not take the heat of steam. There has to be something in > the trash pile that will.... Maybe an empty butane container? Don't forget a > safety pop-off! That's true, and several years ago some modeller used soda patrons (if some of you remembers for those) so that a small two-stroke-like engine used the energy of high pressurized co2 to move down the piston. The drawback was that it was hard enough to keep the engine warm enough not to freeze the pipes cutting off the co2 supply. Tamas On 11/24/06, John Ferrell wrote: > > No offense taken regarding the still. It turns me off because anything I > have fermented or distilled has fallen far below the quality of cheap > wine! > > You sound very well organized and have done your homework well but you > would > not be the first to underestimate the power of steam. > > Heating the whole supply of water is inefficient and dangerous. A separate > boiler may add a little complexity but will likely be worth the effort. > > If you choose to use the pressure cooker as a steam source consider: > Limit the volume of water in a test cycle to a small amount. > Fabricate or buy some kind of pop-off regulator that you can adjust to > your needs to further assure a safe operation. > > I consider steam power a sleeping giant that will become a more important > as > the cost of petroleum continues to rise. The Stanley Steamer automobile > was > never refined but the technology is still there. > > BTW, model airplane builders sometimes use plastic soda bottles for > pressure > accumulators to operate retractable gear. They burst about 150 psi. Of > course they will not take the heat of steam. There has to be something in > the trash pile that will.... Maybe an empty butane container? Don't forget > a > safety pop-off! > > John Ferrell W8CCW > "My Competition is not my enemy" > http://DixieNC.US > > ----- Original Message ----- > From: "Peter P." > To: > Sent: Friday, November 24, 2006 5:28 AM > Subject: Re: [OT]: Pressure cooker burst disk ? > > > > John Ferrell earthlink.net> writes: > > > >> A lot of things to consider here... > >> A lot of energy in the kitchen application is radiated. A fiberglass > >> jacket would save a lot of energy loss. > > > > I agree, and for a sun collector even more so. > > > >> A six quart pressure cooker filled to 4 quarts takes about 10 minutes > on > >> "high" to come up to pressure, it takes half power to maintain > pressure > >> with a minimal "hiss". > > > > Ok, 4 quarts ~= 3.7 liters, with 4.2J/g*K and dT=100K in 600 seconds is > > about 2.6kW in. I assume this is an electrical heater ? > > > >> 15 pounds of pressure may not seem like much but when it is superheated > >> water a sudden breach releases a lot of energy. A smaller pressure > vesell > >> would minimize the risk. > > > > I agree. The pressure cooker I had in mind was the small kind, 2 liters > > capacity. > > > >> I cannot recommend a pressure cooker for anything other than its > >> intended > >> use. It excels as a cooking tool. > > > > Yes, but this is an engineering-related list ;-) ;-) Also making a > > pressure > > and heat-proof boyler from scratch is much harder than adapting > something > > like > > a pressure cooker. > > > > Sorry about the joke about the distillation use. > > > > Please see attached photos of a 10 Watt 2 in. impulse turbine I built in > > 2002. This would run on Victorian steam with a different nozzle. It > > requires 2.2-2.5 bars for optimal operation. It has a shunt type voltage > > regulator that also prevents turbine overrevving (by loading it down), > but > > not overtemperature. Air consumption is about 1l/sec at 3bar with 8.1 W > > out on load (9Vdc at 0.9A into 10 Ohms - this exceeds the limits of the > > generator slightly, the turbine is not the limiting factor here). > > > > thanks, > > Peter > > > > PS: The photos did not go through, sending them 1 by 1 > > > > > > --------------------------------- > > Everyone is raving about the all-new Yahoo! Mail beta. > > -- > > http://www.piclist.com PIC/SX FAQ & list archive > > View/change your membership options at > > http://mailman.mit.edu/mailman/listinfo/piclist > > > > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- unPIC -- The PIC Disassembler http://unpic.sourceforge.net -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist