Imax vs. Vmax is very linear, so using y=mx + c with c = 0, since @ 0V it draws 0A, therefore knowing that tecs are 60% efficent you can work out the Q or pumped heat simply.
my website has a little script that estimates Q from imax vmax and operating voltage.
Looks like @ 12v you end up with
~40watts of cooling power, dont forget that its a quadratic loss since i-v are linearly related. Itll draw ~ 5.3amps.
Edit: i just noticed someone used the kryotherm simulator in the other thread, pretty close to my estimates
]JR[