Re: peltier junction for A/C

["Bill Dube'" <bdube@BOULDER.NIST.GOV>]

>>    Also they generate more heat than they move,  for example the one you
>>describe uses 432 watts, and moves 51.4 watts of heat from the cold side to
>>the hot side.   The hot side is going to have 300-400 watts of heat that you
>>have to get rid of.
>
>They are not that bad. They are over 100% effecient at low delta T. No, Not
>overunity, they just can move more heat than they take in power, the sum of
>the heat used and the heat moved comes out the hot side. I don't have
>curves on them anymore, but I suspect that with very good heat sinks on
>both sides 10 or 20 of them might do well in a car.

    The key is "low delta T" here. This means a few degrees. A regular
airconditioner also moves more heat than the power it uses. The lower the
delta T, the more heat it moves per watt input. When moving large amounts of
heat, your typical mechanical Rankine-cycle air conditioning is about as
efficient and cost-effective as can be.

    A typical ICE car A/C sytem uses about 1.5 to 2 HP. An Ev needs about
3/4 to 1 HP because you are not fending off the waste heat coming from the
hot ICE in front of the car and the hot exhaust underneath the car. You run
it less often in an EV as well for the same reasons.
             _   /|
             \'o.O'              Bill Dube'
           =(___)=           bdube@boulder.nist.gov
              U

Re: peltier junction for A/C