Reverse-cycle air conditioning (heat pump) uses typically three times
less energy than a resistive heater for the same amount of heat.
Plus you can use it for A/C in the summer. This is what the OEM EV's do.
Pricey, however. A resistive heater is probably a more economic choice,
however. Next size up in cells costs less than a heat pump and will
likely give better overall service life due to the lower DOD in the
summer months. Also, run the heater for a few minutes while still
plugged in to warm up the cabin. Takes the chill off with zero load on
the battery.
>>>>
To be humorous, but much to the point: Why not simply burn coal for
cabin heat? Better yet, lignite.
_Much_ cheaper and more compact than diesel fuel. A bit higher
greenhouse emissions but ......
Bill D.
On 10/27/2014 10:24 PM, Jan Steinman via EV wrote:
Perhaps this is a sacrilege on this list, but I'm planning to provide cabin
heat in my 1981 Electranagon with... diesel fuel!
I got hold of an old Webasto hydronic heater. You can find them used among boat
people, bulletin boards at marinas, etc. They sip a tiny bit of diesel fuel,
and turn it into fairly large quantities of hot water, which I plan to run
through my Vanagon's heater core.
Electricity is (as HT Odum would put it) a "high transformity fuel," meaning it
is highly refined and contains a lot of embedded energy. Why waste it heating up
resistors? A 3kW electric heater running for an hour uses up over ten percent of a
typical EV battery, whereas one tank of diesel will last me all winter.
Anyway, just a thought...
Jan
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