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Thrift shop distiller $9
On Sep 13, 2:39 am, (Richard Casady)
wrote: On Wed, 12 Sep 2007 23:17:40 -0700, Keith Hughes wrote: This, IMO, is the crux of the issue of trying to use engine heat for evaporation (i.e. distillation), versus just preheating. For an efficient process, the engine-to-transfer medium exchanger needs to run with a significant delta-t, and so to does the transfer medium-to-process exchanger. This two-step cascade would likely require much higher engine operating temperatures than normal, with all the attendant maintenance and longevity issues. There is no escaping the simple fact that equipment for using the waste heat from an engine for distillation was around for decades. Off the shelf. It was intended for boats, of all things. RO may have killed them off, however. Why do you insist that proven, available off the shelf [ at one time, at least,] equipment cannot work? Under load, the exhaust headers on my car run yellow hot, with a ninety MPH breeze cooling them Enough temperature difference? Something like a quarter of the fuel goes to a hot exhaust. Three quarters of the fuel burned in a gas engine goes to waste heat. Diesels do a bit better, and get maybe one third as shaft work. Casady |
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