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This topic comprises 2 pages: 1 2
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Topic: Humidifier Manufacturers
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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 12-27-2004 01:41 PM
quote:
Even with filmguard it is still advisable to try to maintain the humidy at 50%
I agree with Gordon. Maintaining the relative humidity between the recommended 50 and 60 percent RH not only helps control static buildup, it also maintains the proper curl on the film. Too dry and the film has excessive "positive" curl, and static charge will stay on the emulsion surface. Too damp, and the curl goes negative, and the emulsion becomes softer and sticky, and more prone to projector abrasion.
Always use an EVAPORATIVE humidifier, that blows air through a wet paper, ceramic or foam media. Bemis and others can put many liters of water in the air each day:
http://www.sylvane.com/bemis-humidifiers.html?source=goog&keyword=bemis%20humidifier
quote:
Bemis Whole House Humidifiers
When you want to help moisturize the air throughout your home, these models generate humidity in volume. Featuring evaporative wicks, easy-to-fill bottles or reservoirs, and removable power packs, These Whole House Humidifiers are designed for your convenience and comfort.
http://www.thomasrowens.com/humidifiers.htm
quote:
In winter, the simple act of turning up your thermostat dries out your house. That's because warm, dry air acts like a giant sponge that soaks up moisture from everything it touches.
Fact is that wintertime relative humidity inside the average home hovers around a bone-dry 15%.
By contrast, the average humidity in the Sahara Desert is 25%!
The Unpleasant results:
You may experience dry skin and chapped lips. Dry air can aggravate upper respiratory problems. Itchy skin, dry throat coughs and cracked nasal membranes are all consequences of dry air.
Hardwood floors separate at the seams. Woodwork and furniture shrink, warp and crack. Wallpaper peels at the edges.
Musical instruments are damaged. Desert-dry indoor air literally pulls moisture out of wooden musical instruments, which can cause them to shrink, crack and go out of tune.
Static shocks "zap" you and sensitive equipment. By maintaining indoor relative humidity at 35 percent or higher, static shocks are greatly reduced.
You feel colder, even with the thermostat turned up. Dry air makes you feel colder than the actual thermostat setting because evaporating moisture on your skin causes a cooling effect.
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David Yauch
Expert Film Handler
Posts: 206
From: Mesa, AZ, USA
Registered: Oct 2004
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posted 12-29-2004 08:40 PM
I have a similar question(sort of) so rather than starting a new thread I'll just ask it here.
Would an evaporative cooler work? As the air is taken in through the back and sides of the unit, it is run through long shavings of some sort of coated wood, which have water dripping through them to cool the air, then the air is blown out the front of the unit. The reason I ask, even though we have humidifiers that work just fine in there right now, is that it works WONDERS at cooling down a room and we currently have a/c problems in projection(which is usually what happens when you run a/c vs. humidifiers, it's a battle and someone has to lose). If we could run the evap cooler then it would not only be cooler but it would help with the humidity as well. I'm getting rather sick of 83 degree+ projection, it makes it miserable to stay in the booth which is where we need to be if we want to get any work done. As it is now people stay on the side with problems to thread and start, then run for the cold air outside the booth as soon as they are done. Besides, filling one big evaporative cooler on each side seems a lot simpler than filling 5 or 6 smaller units and having the a/c fixed on a bi-monthly basis, we also have a higher chance of projectionists actually filling this one, as some people wont carry around 5 gallon jugs of water from unit to unit to fill them when needed, and as a result they run dry frequently.
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David Buckley
Jedi Master Film Handler
Posts: 525
From: Oxford, N. Canterbury, New Zealand
Registered: Aug 2004
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posted 12-29-2004 09:21 PM
An evaporative cooler and an evaporative humidifier are much the same animal, air is passed over some substrate that is wet, and the water evaporates into the air, taking with it the latent heat of evaporation, thus cooling the air a bit.
But, these technologies work best when the air is dryest, the drier the air the more water it can absorb, and thus the greatest chilling effect. Leave the thing in a sealed small room for a few hours, like a small booth overnight, the humidity gets up to 90%+, effectively the air is saturated with water, so no more evaporation can take place, and thus there is no cooling effect at all.
What you really want is a computer room air confitioning system, whih can maintain both temperature and humidity, but they are (a) expensive, and (b) generally far too big for a booth, "small" units are 40KW ...
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