getting heavy fog?

[buffo]

A side question about dry ice. Isn't it producing fog itself in some other types of fog machines?

Yeah, as Norty posted above, dropping dry ice into water produces a nice fog. You need to heat the water though, or else it will freeze really fast. (Dry ice is -109 F, or -78 C) Also, for large amounts of fog, you need lots of dry ice. In my opinion, you will be better off using a standard fog machine and just cooling the fog.

Is it just used as a better chiller material than ice for this kind of machine

Yes. Because it is colder than water ice, you can chill the fog from your standard glycol-based fogger while using a shorter "chill path".

Adam

[drm916]

what do people use for these larger outdoor festivals? I always wonder what people do for massive amounts of haze/fog.

[norty303]

For massive amounts of regular fog they just use appropriate sized machines, and enough of them to cover it, with fans to put it in the right place and dispersed properly. When you have a huge show it's less of an issue as the budget can mitigate a lot of the problems.

[planters]

I haven't played with any of these techniques, but I have played with window air conditioners as inexpensive and powerful chillers. Sometimes I have removed the fan that passes air on the cold side of the unit and used the heat exchanger to cool liquids. This can easily cool to -20C as long as the coils are submerged or operating in dried gas. You might try running the fog through a unit and varying the fan speed to optimize the effect. The fog might condense or freeze out or it might not. Alternatively, the coil can be submerged in a fluid that can circulate in your "cold Pipe".

[buffo]

what do people use for these larger outdoor festivals? I always wonder what people do for massive amounts of haze/fog.

Outdoor or Arena foggers do not boil the fluid to build up the pressure to force it through the atomizing nozzle. Instead, they use a compressor to pressurize the fluid and blow it out the nozzle. Thus, they can produce fog more or less continuously. (At least until they run out of fog juice.) You normally see them hooked up to a 55 gallon drum of fog juice.

I saw a video recently where a company was demonstrating some of these things, but I can't seem to find it now. Maybe Brad can help. They had at least 4 of them running continuously for about a minute, and it looked like the entire city block was on fire from all the smoke.

Adam

[White-Light]

what do people use for these larger outdoor festivals? I always wonder what people do for massive amounts of haze/fog.

For prolonged low fog, high end pro machines use refrigerator circuits, and don't just rely on ice or CO2 cooling:

http://www.smokemachines.net/buy-sel...enerator.shtml

[buffo]

I saw a video recently where a company was demonstrating some of these things, but I can't seem to find it now. Maybe Brad can help. They had at least 4 of them running continuously for about a minute, and it looked like the entire city block was on fire from all the smoke.

Found the video!

https://www.facebook.com/hazebase/vi...2130867466564/

Adam

[hitekvoop]

That's great output!

I'm liking my tour hazer so much I'll probably buy a second one.

[buffo]

I'm liking my tour hazer so much I'll probably buy a second one.

If you're looking for a hazer with similar output to a DF-50, then check out the American DJ Haze Generators.

I know what you're thinking: "American DJ makes crap". And I would agree with you normally, but these things ROCK! They are every bit as good as a DF-50 (they might actually put out slightly more, especially compared to a used DF-50), and they are STUPID cheap. I paid $375 each for mine (I have two of them), but these days you can get them for even less.

A quick search on E-bay shows a bunch of factory refurbished units for $334.85 or best offer, and that includes free shipping. I'd send them a low-ball best offer of $595 for a pair of them and see what they said. After all, they still come with a decent warranty so you're safe either way.

Dan Goldsmith at X-Laser turned me on to these things last year, and I've been super-pleased with them. He said that if they die, they die right out of the box. If it makes haze the first time you turn it on, it will run forever. And while I've only had mine for about 9 months, I can say that so far they have been very reliable. Like all hazers, they produce a very fine mist that hangs forever, and they use almost no fluid. (We're talking maybe an ounce if you leave it on continuously for 12 hours.)

Adam

[norty303]

I can agree on the Tour Hazers, I've got one and the Hazebase version too. And got a Look Viper NT arriving tomorrow for plume duties.

Isn't the DF50 an oil cracker Adam?