Joules vs Watts

[macis]

my current set up: ipv3 li n billow v2. 50J 520F degrees Ti1 mode.

here is my question: i'm thinking of upgrading to a DNA40 device. but since it has only 40w on the DNA40, is it the same as if i set it to 40J on my ipv3 li?

 

[Izan]

 

[Boden]

Joules is a meaningless term without a time value.

In other words... Maybe

 

[93gc40]

For our purpose, they are 2 ways of saying the same thing. Just using different languages.

 

[macis]

For our purpose, they are 2 ways of saying the same thing. Just using different languages.

but then, why can't a 200w yihi device goes up to 200J when u do TC?

 

[Boden]

but then, why can't a 200w yihi device goes up to 200J when u do TC?

50J can be 200W for 0.25 seconds.

 

[macis]

50J can be 200W for 0.25 seconds.

hmm..

whats the difference when u r vaping at 40w on a non-Yihi device, vs 40J on a Yihi device, with both setting at the same temp limit?

 

[Boden]

hmm..

whats the difference when u r vaping at 40w on a non-Yihi device, vs 40J on a Yihi device, with both setting at the same temp limit?

No idea.

Without knowing the amount of time that 40J happens in you can't compare the two.

40J can mean 40W for one second, 80W for 0.5 seconds, 160W for 0.25 seconds, 20W for 2 seconds.

 

[bwh79]

hmm..

whats the difference when u r vaping at 40w on a non-Yihi device, vs 40J on a Yihi device, with both setting at the same temp limit?

There is none. Like 93gc40 said, for our purposes they are the same thing. Technically they are not the same thing, but then technically we misuse the term in our industry too so the way we use it (as opposed to what it actually means) a joule is exactly the same as a watt.

50J can be 200W for 0.25 seconds.

But the mod can't see the future. It can't predict how long you're going to hold the button down, and adjust itself accordingly to deliver the right number of joules in that amount of time. When set for 50 joules, it will deliver 50 joules per second, each and every second. That's called 50 watts, yo.

 

[macis]

There is none. Like 93gc40 said, for our purposes they are the same thing. Technically they are not the same thing, but then technically we misuse the term in our industry too so the way we use it (as opposed to what it actually means) a joule is exactly the same as a watt.

and so.. technically speaking, a 40w TC device will not be sufficient for a 50J TC device user?

 

[bwh79]

40J can mean 40W for one second, 80W for 0.5 seconds, 160W for 0.25 seconds, 20W for 2 seconds.

It can mean lots of things. The way the term is misused in our industry, however, it means only one thing, and that is 40 joules per second. Not 40 joules per button press or 40 joules per battery charge, but 40 joules per second. But there's already a word for "joules per second" and that word is called "watts."

 

[bwh79]

and so.. technically speaking, a 40w TC device will not be sufficient for a 50J TC device user?

The watts/joules setting is pretty meaningless in TC mode, anyway. The device will only use the the full power for a second or two until the coil reaches the selected temperature setting, and then back off the power to on the order of a couple dozen watts or whatever is required to maintain that temperature. The only thing watts/"joules" affect in TC mode, really, is the ramp-up time.

 

[macis]

The watts/joules setting is pretty meaningless in TC mode, anyway. The device will only use the the full power for a second or two until the coil reaches the selected temperature setting, and then back off the power to on the order of a couple dozen watts or whatever is required to maintain that temperature. The only thing watts/"joules" affect in TC mode, really, is the ramp-up time.

i think i can finally understand what u mean now. in TC mode, whether its 40w or 40J can only contribute to the ramp up time. the mod will then adjust itself to the temp u set n maintained there.

one last question: if i were a 30-35w Kanthal user, will a DNA40 be sufficient for me in temp mode?

 

[Devn]

i think i can finally understand what u mean now. in TC mode, whether its 40w or 40J can only contribute to the ramp up time. the mod will then adjust itself to the temp u set n maintained there.

one last question: if i were a 30-35w Kanthal user, will a DNA40 be sufficient for me in temp mode?

kanthal isnt good for temp mode. Use Ni200 or Ti coils.

 

[macis]

kanthal isnt good for temp mode. Use Ni200 or Ti coils.

yeah, i mean if i am a 35w max Kanthal user in power mode, but a 50J 520F Ti1 user in TC mode, will the DNA40 be sufficient for me?

 

[Boden]

There is none. Like 93gc40 said, for our purposes they are the same thing. Technically they are not the same thing, but then technically we misuse the term in our industry too so the way we use it (as opposed to what it actually means) a joule is exactly the same as a watt.


But the mod can't see the future. It can't predict how long you're going to hold the button down, and adjust itself accordingly to deliver the right number of joules in that amount of time. When set for 50 joules, it will deliver 50 joules per second, each and every second. That's called 50 watts, yo.

The joules setting only effects the preheat period which if you look at the oscilloscope charts changes time period as joules is adjusted. They are doing something other than applying 40W for 40J. Yo

 

[Boden]

yeah, i mean if i am a 35w max Kanthal user in power mode, but a 50J 520F Ti1 user in TC mode, will the DNA40 be sufficient for me?

Honestly if you're going to run that close to a mods maximum output I would suggest going up a step.

 

[macis]

Honestly if you're going to run that close to a mods maximum output I would suggest going up a step.

as in getting a higher watts device? hmm DNA200...

 

[bwh79]

The joules setting only effects the preheat period which if you look at the oscilloscope charts changes time period as joules is adjusted. They are doing something other than applying 40W for 40J. Yo

The ramp-up time changes because when you turn up the power (be it measured in watts or joules-per-second, doesn't matter because they are they same thing) then it doesn't take as long to heat up, natch.(moderated)

 

[Boden]

The ramp-up time changes because when you turn up the power (be it measured in watts or joules-per-second, doesn't matter because they are they same thing) then it doesn't take as long to heat up, natch. (Moderated)

If that were true the time period would be shorter at higher joules instead of longer.