What ohm do I need for my cartos on these models?

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Katya

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Here you go. GMante, hope you don't mind...:)

My recommendation would be to get 3.0Ω for your kr8 batteries, as they are 3.7v, and that would create a very nice, warm vapor. The eGo/Riva batteries' effective (under load) voltage is much lower, about 3.1 or 3.2v, so 2.5Ω cartos would be more suitable. But these E2 cartos seem to run a bit hotter than standard cartos, so 3.0Ω might be fine, too. I'm using the 3.0Ω E2s on my Riva right now and they feel pretty warm. Remember the formula to calculate the power (heat) of your vape:

Wattage (heat) = Voltage/Resistance x Voltage.

Online Conversion - Ohm's Law Calculator

Good luck.
 

dragginfly

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Nov 3, 2010
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It boggles the mind, doesn't it?

But these E2 cartos seem to run a bit hotter than standard cartos...

Remember the formula to calculate the power (heat) of your vape

I must agree that the power is directly related to heat. It's a
conservation of energy rule. Since we are not using the battery
to do any work, all the energy is converted to heat.

If the E2 cartos at a given voltage/resistance use the same
power as a standard carto, why is there more heat?

Why can a higher power voltage/circuit combination can seem cooler
than a lower power circuit... even though it is using more power?

For example:

My 5v PT with a 3.4 ohm 'cool' carto builds awesome vapor and
excellent flavor. The delicate flavor is presumably due to the
lower operating temperature in the carto. The shell casing of
the carto has never felt more than mildly warmer even after
power vaping on it until I was forced to quit.

Power consumption: ~ 7.4 watts (@ 1.47 amps)


My 3.7 KR808 with a 2.5 ohm standard carto builds a ton of
vapor, but it is much warmer and the flavors are sharp. Some
of the delicacies are lost. The shell of the cartos also gets
much, much warmer.

Power consumption: ~ 5.7 watts (@ 1.48 amps)


Why does the lower voltage/power of the KR8
battery produce more apparent heat?

Like I said...it boggles the mind.

My guess it gets into the heat transfer aspects
of the individual carto designs.

An empty carto definitely passes more heat to
the outer shell much quicker. A full carto stores
more of that heat in the fluid.

My PT with the HR cartos has much better air
flow. Perhaps the air flow creats the 'cool' affect.

It's still a mystery to me.

I may figure it out, but any suggestions from those
who have solved the puzzle may help me loose
less sleep over it. LOL
 

dragginfly

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Nov 3, 2010
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I forget which law of thermodynamics this is...

But the principle is that pressure, temperature and volume are related.

As a gas is compressed into a smaller volume, the temperature rises.

As a gas rapidly expands, the temperature decreases. The heat is
absorbed into the energy of the particles.

Something to that effect.

So a higher power device could produce an apparently cooler vapor
if the transfer of energy caused it to expand rapidly and efficiently.

Does this make sense or sound reasonable?

In the PT arrangement described above, the vapor produces is light,
dry and cool. It also appears to have more volume.

A poor transfer created at a lower power level (or other causes in
the atomizer design or liquid itself) that produces a heavy, wet vapor
would then have more apparent heat... in theory.

I wish an expert on electo-thermo power transfer would come along
and easy my mind so I could get some sleep. LOL

I know there are some lurking around here. The ECF has some of the
most intelligent, educated people I've seen yet in any community.
 
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