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Ping Ohara - Sea Water Heat Powered Boat
"Richard Casady" wrote in message ... On Thu, 9 Oct 2008 17:36:54 -0700, "Calif Bill" wrote: "Richard Casady" wrote in message . .. On Thu, 9 Oct 2008 10:52:19 -0700 (PDT), wrote: On Oct 7, 5:26 pm, "Calif Bill" wrote: "Wayne.B" wrote in message news 
On Tue, 07 Oct 2008 15:07:53 -0500, Vic Smith wrote: This is what I was thinking, but since my thermodynamics training is insufficient, I'd like to enlist your help. Besides your technical expertise (sorry I can't say the same for your political judgement) you're down there where the water is warm. What we need is a heat extraction process that will at least add locomotion power to a boat. Actually you need a temperature "difference" to extract mechanical power. Most of the sea water power schemes that I've seen rely on using the temp difference between warm water on top and cool water from the depths. That might work for a stationary power plant but would create way too much drag for a useful boat. Thermocouples will work in heat alone. Proposals to help fuel economy by placing thermocouples along the exhaust pipe to turn waste heat into electrical energy.- Hide quoted text - - Show quoted text - Thermocouples cool themselves by generating electricity. You don't have enough heat in the sea water for thermocouples. Thermocouples have to have both a hot junction and a cold one to work. Casady Huh? Then how come the thermocouple in the heater pilot light keeps working? Are you saying that all the wiring is at uniform flame temperature? I didn't think so. What I said was that there has to a temperature difference. Look up thermocouple in any physics text. Wiki:Thermocouples measure the temperature difference between two points, not absolute temperature. In traditional applications, one of the junctions-the cold junction-was maintained at a known (reference) temperature, while the other end was attached to a probe. Casady Wiki is mistaken. The cold junction is where the temperature can be measured. But thermocouples are disimilar metals the cause a current to be generated between the two metals when heat is applied. Milliamps of current, or a real small amount. You can make your own thermocouple by connecting the special thermocouple wire together and heat the junction. Enough current is caused to be able to pull a solenoid if required. Very low current solenoid, but still current generated. Check out Omega Corp. We used to buy the thermocouple wire they manufactured. |
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