Testing next generation pen heaters

Just got a few variations of this idea back from some product testers who gave them a good spin. This particular one was kept clean by a fastidious owner. People like it but we think it is not quite ready.

All-Ceramic VB Eleven Pen Heater Skillet

Formula for Power Needed to Heat a Volume of Air

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.