End of Halogen?
- Thread startertjrobb
- Start date
We have an organ blower cage in the PAC, but there's no signage. Remember that in theater, the organ you're blowing is likely your liver....
The seal rooms were for aquatic mammals - below stage level and typically near the orchestra pit entrance. An artifact of the Vaudeville Era, can you imagine what the musicians had to smell on their way to the pit? @RonHebbard may have memories of such things.
BillConnerFASTC
Well-Known Member
Have come across a lot of elephant rooms in old theatres - and a camel room in a Scottish Rites temple.
epimetheus
Well-Known Member
Smayniac
Member
Nobody has gone to this yet so I'll throw in a comment. Everyone talks about LED saving power versus tungsten/incandescent but the real power savings are in HVAC, without those big incandescent loads heating the building you can install smaller air conditioning units and you actually save more money on cooling than on lighting itself.
Bob
Bob
BillConnerFASTC
Well-Known Member
True as I pointed out in justifying some early all LED projects. Also smaller chillers, boilers, fan coil units, and ducts, so initial cost savings as well. Another reason replacing incandescent in an existing theatre is hard to justify. Many savings not available.
802.3af ("PoE") is 12.95 W, 802.3at ("PoE+") is 25.5 W (these are the power available to the powered device, source power is higher), 802.3bt (currently being called "Next gen PoE" or "100W PoE" in the literature that I've found) supports 51 W or 71 W.
Wikipedia link
Belden description of 100W PoE
@BillConnerFASTC "smaller chillers, fan coil units, and ducts" I understand but "smaller boilers," how so?
Toodleoo!
Ron Hebbard
Chris Pflieger
Well-Known Member
For a theatrical or similar space with a large light load, I hope so! There's a large difference in heat load between a room with a handful of fluorescent lamps on for general lighting and the same space with a 300 - 1000 W lamp running every ~8 - 30 sqft in the same space. Even if LEDs were 0% efficient (that is, 100% waste heat) for the same light output we're looking at easily under 1/10th if not 1/20th the heat load of incandescents.
Yes. The lighting load with traditional fixtures is huge.
Theatres are challenging for mechanical engineers - they have to balance the fact that the "peak load" of both lighting and occupancy occurs often and all at once and for a few hours at a time. They also have to account for acoustics and have air move at much lower speeds than normal.
BillConnerFASTC
Well-Known Member
Yes. I do a detailed statement for every project on cooling loads. It's a third or fourth with all LED compared to all incandescent. And there is usually a long discussion if diversity and length and likelihood of a big show in middle of day on hottest day of the year.
Yes, not sure why I added boilers. That would probably not change though the heating contributionn of lights is missing ....
Yes, not sure why I added boilers. That would probably not change though the heating contributionn of lights is missing ....
@RonHebbard should know you have to boil (vaporize) ammonia to keep the ice floor frozen (absorption refrigeration).
The main stage at the Masonic Temple in Detroit has floor pockets with large forged rings anchored in them, which, as the Mason giving the tour explained, were for tethering elephants.
There’s a PLASA Protocal article of a few years back about Seattle Rep. having done a electrical usage survey. They used the software FocusTrack to calculate the incandescent lighting loads as used by the system during rehearsals and performances. The stage lighting system was 2% of the total electrical load in a year.
Makes it hard to justify an LED purchase based on savings in electricity.
http://edition.pagesuite-profession...me=&edid=444f8e2e-96bb-41de-8eb7-ca450656911e
