We've had this formula kicking around since college days. Not sure if we're using it out of its useful range so might be good to check this with a valid source.
By this formula, where
- Exit temperature is 500F (it's cooler than that by the time it soaks through the herbs)
- Room temp is 75F
- Normal inhale is .25 CFM (roughly 2 liters in a 15 sec inhale by our testing)
- The thing being "cooled" is the vapor box's heating element and surrounding glass
P(W) = 169 * (.25) * ( 533K / 297K - 1) = 33.6W
We need about 34W to heat the air in a normal inhale... theoretically. (our normal is pretty big actually.. this could be cut in half) This puts the hits we like out of the range of a handheld battery.
After heatup our vaporizer runs at 34W, although this is kind of a coincidence because the user only inhales at this .25CFM rate for 7-10 sec and the heating ceramic and surrounding glass stores heat that it can give up during a longer vapor draw. If someone were to inhale constantly at .25CFM our vaporizer will consume something closer to 100W.
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