Joules vs Watts

[Ryedan]

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?

No, the DNA40 will not be sufficient, you'll want at least 50 watts/joules. I typically like around 35-45 watts which limits me with my VS DNA40 a bit. The other thing is occasionally I like 55 watts, so I have to use another device. Watts are cheap, IMO buy enough of 'em to cover what you might need in the future.

 

[macis]

No, the DNA40 will not be sufficient, you'll want at least 50 watts/joules. I typically like around 35-45 watts which limits me with my VS DNA40 a bit. The other thing is occasionally I like 55 watts, so I have to use another device. Watts are cheap, IMO buy enough of 'em to cover what you might need in the future.

yes, i'll give it sm this about getting a DNA200 device. actually i have three in mind, the Vaporshark dna200, VT200 n Lavarbox. any idea which is better?

 

[bwh79]

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

Err, look. I don't have much experience with TC-enabled devices, but I do know my physics. Watts are a rate of energy transfer, and joules are a quantity of energy that is transferred. One watt is equal to one joule-per-second. That is the very definition of a watt. Without being able to predict how long you're going to hold the button down, which would require foreknowledge of a future event -- a physical impossibility -- how is the mod supposed to adjust its rate in order to deliver a certain quantity of energy over the course of your hit? The only thing it can do with certainty is deliver energy at a particular rate (watts). The quantity (joules) of energy delivered depends entirely on how long that rate is sustained, i.e. how long you hold that button down. I don't know what you think the "joules" setting affects, but I'm certain that you have a misunderstanding, somewhere.

...and yes, the ramp-up time should be shorter at higher joule settings. If you're findings indicate that it takes longer, then there's something wrong with your testing procedure (or, I suppose, it could also be a problem with the device itself). Are you starting with a cold (room-temperature) coil each time?

 

[Boden]

Err, look. I don't have much experience with TC-enabled devices, but I do know my physics. Watts are a rate of energy transfer, and joules are a quantity of energy that is transferred. One watt is equal to one joule-per-second. That is the very definition of a watt. Without being able to predict how long you're going to hold the button down, which would require foreknowledge of a future event -- a physical impossibility -- how is the mod supposed to adjust its rate in order to deliver a certain quantity of energy over the course of your hit? The only thing it can do with certainty is deliver energy at a particular rate (watts). The quantity (joules) of energy delivered depends entirely on how long that rate is sustained, i.e. how long you hold that button down. I don't know what you think the "joules" setting affects, but I'm certain that you have a misunderstanding, somewhere.

...and yes, the ramp-up time should be shorter at higher joule settings. If you're findings indicate that it takes longer, then there's something wrong with your testing procedure (or, I suppose, it could also be a problem with the device itself). Are you starting with a cold (room-temperature) coil each time?

I am quite fimilar with joules, watts, etc.

Please go look at the oscilloscope charts that Mr. Busardo put up. Then we can talk about how they are using the term. Untill then I wish you well.

 

[bwh79]

Please go look at the oscilloscope charts that Mr. Busardo put up. Then we can talk about how they are using the term.

Gladly. Got a link?

 

[Rabbit Slayer]

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

1W for 50 seconds is 50 joules, 50W for 1 seconds is also, 50 joules...they're using it wrong and it is annoying!!

 

[Completely Average]

Joules, as the term is being used by Chinese ecig makers, is a meaningless term. They are using the term joules incorrectly. What they are really referring to is watts.

So, with the Yihi chip, 50j = 50w. It's just that simple. There is no length of time involved here. It's a simple misuse of the term.


Now, to answer the question as to why a 150W mod doesn't go up to 150j in TC mode, that's because it would blow the coil before the temperature control function could kick in. It would be like applying 200W to a 40W light bulb. You would hear a pop, maybe even see a little flash, and the coil would be broken.

 

[classwife]

Let's discuss without being snide please

 

[tj99959]

Actually the "J" word was used to make the chip set sound like it was a bit more upper class than all those chip sets that only used the lowly "W" word.
Nothing more than creative marketing.

 

[Ryedan]

yes, i'll give it sm this about getting a DNA200 device. actually i have three in mind, the Vaporshark dna200, VT200 n Lavarbox. any idea which is better?

Sorry, I don't know anything about the VT200 but I'm sure some folks do and I'll leave it to them to advise

 

[Ryedan]

Joules, as the term is being used by Chinese ecig makers, is a meaningless term. They are using the term joules incorrectly. What they are really referring to is watts.

So, with the Yihi chip, 50j = 50w. It's just that simple. There is no length of time involved here. It's a simple misuse of the term.

Agreed.

Now, to answer the question as to why a 150W mod doesn't go up to 150j in TC mode, that's because it would blow the coil before the temperature control function could kick in. It would be like applying 200W to a 40W light bulb. You would hear a pop, maybe even see a little flash, and the coil would be broken.

The DNA200 goes up to 200 watts in TC mode. There is no reason a properly designed TC build would pop coils at a reasonably set power level.

I've run Ti at 75 watts in a Sig 75w TC at 75 watts and it worked just fine. It was not temperature limited so it actually stayed at 75 watts through the whole drag and then kicked in when I let the wicks become dry.

I have not tried it but I would imagine that if you build for say 10 watts and set 200, an overshoot of coil temperature at the start of the power cycle could be significant enough to damage a coil, which is what I think you're referring to. OTOH, it would be kind of overkill to set 200 watts/joules, or even 50 watts for a 10 watt vape. And if the electronics is quick enough, it would also limit the power fast enough so even that wouldn't happen.

I think a little experiment is in order

 

[93gc40]

1W for 50 seconds is 50 joules, 50W for 1 seconds is also, 50 joules...they're using it wrong and it is annoying!!

The one that gets me is MICRO Coil when all one means is Contact Coil. Especially when the build is a macro coil.