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This topic comprises 2 pages: 1 2
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Author
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Topic: Water Chillers
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Phil Hill
I love my cootie bug
Posts: 7595
From: Hollywood, CA USA
Registered: Mar 2000
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posted 05-11-2002 07:40 PM
Frank,
John is correct...."A bit of permanent (ethylene glycol) antifreeze helps prevent corrosion and bacterial/algae growth." Most systems are not "closed" systems as they do not prevent air-borne contaminations from entering the system. >>> Phil
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Dave Macaulay
Film God
Posts: 2321
From: Toronto, Canada
Registered: Apr 2001
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posted 05-11-2002 10:01 PM
The Strong/Christie/Cinemecchanica (they all seem to be the same thing) recirculator should have no problem with a 7K!
We installed them in every AMC booth with 4kW and up, there are several 7K consoles and the water gets slightly warm after a show, hardly steaming. Maybe the old XL gates got hotter than the Millennium though..?
I recently made up a closed system cooler for a rental Strong 35/70 with a Super 80. With a sumbmersible pump in a waterproof conduit box reservoir, a small radiator and a muffin fan gets rid of the heat. With the fan off and a 4K lamp hitting the gate with the shutter stopped open, the water got to 60C in about 20 minutes, starting the fan brought it back to room temperature quickly. Since it's a closed system I used distilled water with ~5% "Red Line Water Wetter" as an anticorrosion agent - it's supposed to make the water cool stuff better too. I don't think a fungicide is needed if it isn't an open system.
I would recommend a simple radiator system if you get hot water witha circulator. A refrigerated system, whether phase change or peltier, is overkill and overly expensive.
I used an automotive oil cooler as the radiator, about 6x12 inches. A "little giant" pump, and an ABS 8x8x8 waterproof conduit box as reservoir. It all fits in the base of a Century pedestal (a rather old one) so we don't have to manhandle a circulator and jug of water on rentals.
There are cute little radiators available for computer watercooling that would be convenient too. Google for "black ice radiator" and you should find a few.
I don't like glycol as it is poisonous, messy, and I've added it to circulators using submerged pumps which have worked happily for years in plain distilled water - and had the pump paint flake off and the pump casting become a slimy corroded mess after one year with the glycol.
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Phil Hill
I love my cootie bug
Posts: 7595
From: Hollywood, CA USA
Registered: Mar 2000
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posted 05-11-2002 10:20 PM
Hmmmm.... I guess the take is don't drink the (cooling) water. The usual cooling configuration is not a submerged pump but rather a pump-in-the-lid-on-the-reservoir and has not been a problem for me. The closed and/or radiator/fan seems to be an over-kill for most applications. I've done extended gate-temperature tests with 7kW and 12kw lamphouses and had safe gate temperatures...even with extended run times. Strong Ultra 80's and custom-built 12/15kW lamphouses leveled off at 120-160 degree F gate temps with H2O and well over 200 without.>>> Phil
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