Not only flue heat but combustion chamber heat too.

Neil.

On 7/21/07, Michael Elliott <camping.elliott@gmail.com> wrote:
> Actually, no -- a fair question. It was just an off-the-cuff statement.
> But a real strong indication of heat generated is power consumption. On
> 12V, the Dometic draws -- what? 8 amps continuously? While the Norcold
> pulls 2.5A (measured) when running, and has a duty cycle less than 50%
> in my experience. So on 12V, the Dometic is a nice little 8 x 12 = 96
> watt heater, while the Norcold is closer to 2.5 x .5 x 12 = 15 watts (or
> less depending on ambient temp and thus duty cycle). So the Dometic
> dissipates more than 6 times the heat as the Norcold.
>
> I betcha that when the Dometic is running on propane, there is even more
> heat dissipated due to the hot flue.
>
> --
> Mike "Rocket J Squirrel" Elliott
> 71 Type 2: the Wonderbus
> 84 Westfalia: Mellow Yellow ("The Electrical Banana")
> 74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano
> KG6RCR
>
>
>
> Mike S typed:
> > At 06:02 PM 7/21/2007, Michael Elliott wrote...
> >>  Far less heat
> >> than what the Dometic has to dump: heater + extracted food heat.
> >
> > I'm not so sure that's true. You are definitely neglecting the heat
> > given off by the motor and (friction in the) compressor. Do you have a
> > citation stating efficiencies of both ammonia and Rankine cycle
> > refrigerators at this scale?
> >
>

--
Neil Nicholson. 1981 Air Cooled Westfalia.

http://web.mac.com/tubaneil