I actually inquired with Cyclone Power Technologies regarding the efficienc= y of their present engine designs. Below is the response I received from their marketing manager. =20 "The WHE is designed for lower temperature and pressures. We will need abo= ut 1100 degrees F to keep the working temp of the WHE at 600 degrees F. The f= uel consumption for the WHE is approximately 25,000BTU per Hp per hour so for f= ull electrical output of 10 kW we need about 450,000 BTU's. Thermal efficiency= is around 11% =20 The other engine, the Mark V is more efficient and runs at higher temperatu= res and pressures. The combustion (flame temp) needs to be around 2100 degrees= F to keep the working temp at 1200 degrees F. At this temperature the fuel consumption is approximately 8500 BTU per Hp per Hour or 850,000 BTU's to produce 55 kW electrical output. Thermal efficiency is approximately 32%, = the higher the temp the better the efficiency." =20 Some of you may have done the same thing just for curiosity. =20 =20 Randy Abernathy CNC and Industrial Machinery=20 service, repair, installation and=20 design 4626 Old Stilesboro Rd NW Acworth, GA 30101 Fax: 770-974-5295 Phone: 678-982-0235 E-mail:=20 randyabernathy@bellsouth.net _____ =20 From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of RussellMc Sent: Sunday, February 06, 2011 11:28 PM To: Microcontroller discussion list - Public. Subject: Re: [TECH] Cyclone Engine =20 > On Feb 3, 2011, at 10:26 AM, James Newton wrote: >> burns ANYTHING cleanly and completely. > I find it difficult to believe that this is possible. It's not :-). I think that what they mean is that it uses "external combustion" and so does not have several of the problems internal combustion spark or compression ignition engines do. hen using atmospheric air as an oxidiser you tend to get Oxides of nitrogen as a byproduct. residual level depends on how much effort and $ you want to expend. If CO2 is not 'clean" then nothing burning carbon is going to be 'clean" without CO2 sequestration of some sort. But an EC engines gives you a good star\t over an IC engine wrt pollution. > (that nit out of the way, I don't see any reason that a better > external combustion engine isn't exciting for a lot of other reasons...) Yes. A question is, IS this a 'better" external combustion engine? It is at heart "yet another steam engine". It may be very good indeed, but so far it's not obvious that it is violently different from many other past steam engine dreams. And "violently different" tends to be what's is required to break free from 'more off the same but different'. A Stirling Engine [tm] IS violently different than anything else that is commonly in use at present. this doesn't per se make it better or best or good enough to be what it takes. The giant Phlips corporation spent perhaps several decades playing at Stirling Engine development, and had engines driving cars and buses, and finally gave up. They did not consider that the SE was fatally flawed for the purposes they were trying to put it to. They in fact considered that it was only a matter of spending enough time and money on it. Company fortunes at the time lead them to rationalise operations and 'get back to basics' and core products, and SE's were definitely not either. BUT they stated that if somebody spent the sum they considered likely to be required (figures of $US10 billion and $US30 billion lurk in my mind) then the payback period in petroleum savings would be about 4 months worldwide. Most people would be very happy with that sort of payback period :-) . (I know of a product that achieves that in a legitimate manner, but that's another story). I will be pleased to see Cyclone stir up a storm. But I'll be surprised but pleased if they ever get much past Florida. Even the "Whispergen" Stirling Engine based CHP system has got from NZ to Spain and UK and into ocean going yachts world wide. When the Cyclone manages to exceed Whispergen's results to date it will have achieved a notable success. Russell -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist=20 _____ =20 No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1204 / Virus Database: 1435/3428 - Release Date: 02/07/11 --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .