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**To**:**nfc at actwin_com****Subject**:**Re: NFC: Peltier Junction Cooling****From**:**"D. Martin Moore" <archimedes at master_localink4.com>**- Date: Sun, 10 Jan 1999 01:26:41 -0600
- In-reply-to: <v02130508b2bbeb717ec1@[128.146.158.157]>

OK, 1 Joule=0.24 cal. Can you get Joules from all this mess? (Can't get to my physics book right now). > >Electrical work: W = VA = 12*8.5 = 102 watts. > >W/Q >= 1 - Tc/Th, so Q <= W/(1 - Tc/Th). > >Tc = (0 + 273) K = 273 K. Th = (50 + 273) K = 323 K. > >Therefore, Q <= 102 watts/(1 - 273/323) = 659 watts. > > > >So this particular device could transfer _at most_ 659 watts (2249 Btu/hr). > >The actual amount is probably a lot less. > > > >If we knew the actual heat transfer rate, we could compare the efficiency of > >the Peltier junction with that of an ordinary refrigerator or air > >conditioner. (Just convert the heat transfer from Btu/hr to watts.) > > > OK, now calculate that for a gallon of water (assuming no heat is lost > through glass or elswhere). How many degrees temp can a gallon of water be > lowered with that much power? I have no clue how to calculate this. > > > Mark Binkley > Columbus Ohio USA <))>< > mbinkley at earthling_net > > > Prost, Martin ----------------------------------------------------------- Greater American Freshwater Fishes Resource Site (GAFFeRs): http://www.localink4.com/~archimedes/ "Fie on thee, fellow! Whence come these fishes?" - Scheherazade "Any fish with good teeth is liable to use them." - Wm. T. Innes

**Re: NFC: Peltier Junction Cooling***From*: mbinkley at earthling_net (Mark Binkley)

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