cablepro..
you're right about the Amps drawn at 12V..
but what if:
i don't care about the ineffeciency at Vmax (and the xtra heat generated at the hotside).. and want to get the highest Tdelta..
if u run the pelt at Vmax and Imax... and with no load the Tdelta will be the Tmax
this is for a TEC-55W@16V@6A@70°C
T(°C)
as u can see the Max
T will be reached at Imax and Vmax..
and at 13.8V and 4.8A the Tdelta will be 67°C
T(°C)
here u see that the power curve is quadratic.. the space between the 6A and 4.8A line is
much smaller than between the 2.4A and 1.2A line
Quote:
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What this means, (and i've verified with Tedist) is that the advertised Qmax is wattage at "maximum efficiency", hence the "max" subscript...since it has been determined that peltiers run at maximum efficiency under 75-80% of full power, it stands to reason that I would be getting Qmax while only providing 12.5A, 12V...
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the MaxTdelta is reached at Imax and Vmax..
normally the Qmax is taken at Vmax and Imax..(because over the Vmax the deltaT is reduced due the 'joule' effect)
joule vs peltier effect
the peltier effect draws the heat from one cold side to the hot side... the peltier effect is linear to the VA (volt x amp)
the joule effect causes the internal heating of the TEC (think about a light).. the joule effect is quadratic to the VA..
thats why the power vs Q curve is quadratic.. at a certain point the joule effect start being dominant to the peltier effect.. at that point the TEC draws Vmax @ Imax and can move Qmax and can have a MaxTdelta of Tmax with noload.
so now u understand why I dont understand ur little test :?
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OC'ing is my middlename