The small gaps needed to make a hydrodynamic bearing using CO2 make the friction much worse. Turbines attached to high speed generators are good because the high rotor surface velocities mean less surface area is needed, making the generator smaller, lighter and cheaper. Unfortunately it just doesn't work for CO2 because of the high density fluid friction.
Because of their low velocities linear generators need a lot of magnets and surface area making them very big and expensive. On 2 December 2011 21:09, Horace Heffner <[email protected]> wrote: > This is an interesting problem. At thin film tolerances liquids or even > compressed air act like a lubricant. It may be worthwhile to consider > conical thin film CO2 bearings. The surface of an armature can be made > smooth and cylindrical or nearly cylindrical but slightly conical, if > necessary using a thin steel enclosure. The armature could of course be a > continuation of the turbine shaft. The stators could be located outside the > shaft. > > The high pressure CO2 could be directed in part to the bearings, thus > allowing the high pressure side to act as the equivalent of an oil pump for > an internal combustion engine. > > The armature in such a configuration need not contain permanent magnets or > coils. The stator coils and cores cold be located outside the pressure > envelope. The armature could consist of the equivalent of one or more U > shaped magnetic flux conductors, making and breaking the magnetic circuit > with rotation. > > For very small units a turbine could be avoided entirely, by using a free > sliding linear motion armature, driven in a manner similar to old steam > engine pistons. The armature would simply make or break one or two > external magnetic circuits to generate power. It would oscillate back and > forth like a frictionless air hockey puck. > > A very small LENR unit could be used to charge an EV battery 24 hours a > day. > > All just food for thought. > > > On Dec 2, 2011, at 4:48 AM, Robert Lynn wrote: > > Having looked into this in detail recently (I was thing the same thing) > the frictional losses on the surface of the generator rotor are just too > high compared to the magnetic fields that exist in the rotor air gap and > you end up wasting all of your efficiency gains on CO2 friction on the > rotor. It is like trying to run the rotor at high speed while it is > surrounded by water. > > On 2 December 2011 12:56, Horace Heffner <[email protected]> wrote: > >> Thanks to Jouni for a great reference! >> >> I don't see any reason CO2 turbomachinery in application with LENR could >> not be sealed in a high pressure envelope involving no moving seals. The >> transactions are heat in and out and electricity out. The generator would >> have to be brushless, but that is no problem. >> >> >> On Dec 2, 2011, at 12:03 AM, Robert Lynn wrote: >> >> CO2 turbomachinery is not scalable to less than perhaps a few hundred kW >> due to the extremely high density of CO2 (100's of times air density), and >> very expensive seals. In a distributed generation LENR world it will have >> pretty limited applications; maybe aircraft, trucks, trains and ships, but >> with Gas turbines so simple (no radiators required) and heat so cheap I >> don't think you would bother with CO2. >> >> On 2 December 2011 00:17, Aussie Guy E-Cat <[email protected]>wrote: >> >>> Quote: "The Brayton cycle could yield 20 megawatts of electricity from >>> a package with a volume as small as four cubic meters." Wow 1.6 x 1.6 x 1.6 >>> mtrs for 20 Ac MWs at 46% thermal to electrical energy conversion! Another >>> total game changer. The good news just keeps on happening. So much for 2012 >>> being the end of the world. Baby it is just starting to come together. We >>> are on steroids and moving at light speed into a new era of thermal and >>> electrical energy production. Jouni thanks for that amazing link. You made >>> my day. >>> >>> AG >>> >>> >>> >>> On 12/2/2011 10:22 AM, Jouni Valkonen wrote: >>> >>>> I am a great fan of this Cyclone engine. There is also similar >>>> emergencing technology that uses super critical carbondioxide instead of >>>> super critical water. The main benefit of going into super critical is that >>>> the efficiency can go up to 46% for heat engine. And also with carbon >>>> dioxide temperatures can be as low as 250-300 °C. >>>> >>>> *Supercritical Carbon Dioxide Brayton Cycle Turbines Promise Giant Leap >>>> in Power Generation* >>>> ScienceDaily (Mar. 4, 2011) — /Sandia National Laboratories researchers >>>> are moving into the demonstration phase of a novel gas turbine system for >>>> power generation, with the promise that thermal-to-electric conversion >>>> efficiency will be increased to as much as 50 percent -- an improvement of >>>> 50 percent for nuclear power stations equipped with steam turbines, or a 40 >>>> percent improvement for simple gas turbines. The system is also very >>>> compact, meaning that capital costs would be relatively low./ >>>> >>>> http://www.sciencedaily.com/**releases/2011/03/110304090459.**htm<http://www.sciencedaily.com/releases/2011/03/110304090459.htm> >>>> >>>> This water based Cyclone engine should be in every aspect (moving >>>> parts, friction, noise, vibrations, efficiency, weight, pollution, and >>>> waste motor oil) at least twice if not thrice as good as traditional >>>> internal combustion engine. If someone would invent an internal combustion >>>> engine today, it would be ridiculed as impossible, due to unsurpassing >>>> material and engineering challenges. External combustion or electric >>>> engines are just way too much simple and easy technologies compared to to >>>> internal combustion engines. >>>> >>>> –Jouni >>>> >>> > Best regards, > > Horace Heffner > http://www.mtaonline.net/~hheffner/ > > > > >
