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Author Topic: Need Heat/CFM specs for Booth AC Martin McCaffery Film God Posts: 2481 From: Montgomery, AL Registered: Jun 99 posted 06-19-2007 11:17 AM                        We're specing an AC for the projection room. This will include the exhaust and an AC system for the booth. Single Screen, two projector, Strong X-60D, 2000 watt. Contractor needs Lamphouse Btu and Lamp CFM.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 06-19-2007 12:35 PM                     Good luck with that...there are rules of thumb and hard and fast facts on the Btu/hr based on wattage...however, once you add exhaust into the equation...how much heat load is still presented to the room is less clear. For instance...a 2KW lamp will produce 6824 Btu/hr...however you have an exhaust stack right above that drawing some of the heat out and not presenting the full amount to the room. You will also need to add in for the rectifier and even the projector if you are to be completely accurate...as Mark G will tell you, the switcher type rectifiers are more efficient and will present less heat load to the room.  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 06-19-2007 02:10 PM                        Remember, too, the "cost" of replacement air. Louis  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 06-19-2007 03:51 PM                     Nah Louis...you skip that and then save yet again on door closers for the booth...they will be "automatic" On a serious note, that replacement air can be specified as conditioned (temperature/humidity controlled) or unconditioned (fresh air). Take a guess which one you want. Steve  |  IP: Logged Martin McCaffery Film God Posts: 2481 From: Montgomery, AL Registered: Jun 99 posted 06-19-2007 09:11 PM                        Thanks. Louis, any idea how much heat the sound rack puts out? The rectifiers? Re the replacement air. we were discussing ways of being able to switch between conditioned and non, because we actually go months without the heat or ac running in the auditorium. the AC guy wanted to know if it was possible to vent straight into the front of the lamphouse. Didn't sound like a great idea to me, but thought I'd ask.  |  IP: Logged Kenneth Wuepper Phenomenal Film Handler Posts: 1026 From: Saginaw, MI, USA Registered: Feb 2002 posted 06-20-2007 06:30 AM                     Martin, I believe that your AC guy wants to make the projector lamp house a "closed circuit" air system. That is, he wants the booth air not to be involved in the venting of the lamp. The replacement air would come from a source outside of the booth as well as the vented air being discharged outside. This system might have some advantages by eliminating the make up air coming into the projection room but it will also cause a lot more "plumbing" around your machines. That system would not assist with the heat radiated into the room out of the lamp house. KEN  |  IP: Logged

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