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Old May 30th, 2009, 12:09 AM   #18321
drew.magoo
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Quote:
Originally Posted by percy07 View Post
Forgive me for my ignorance... are those spiral concrete structures at the base of the tower entrances to underground parking?
yes, they are. i think there is one in each corner, am i correct?
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Old May 30th, 2009, 01:26 AM   #18322
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wow.
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Old May 30th, 2009, 02:27 AM   #18323
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isnīt the lake blue? why is the lake green?


now it looks like a lake....not a pig pool....
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Old May 30th, 2009, 03:11 AM   #18324
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Quote:
Originally Posted by Adam2707 View Post
At peak demand its estimated to be about 36 mVA. 'Equivelent to 360,000 100watt bulbs on at the same time'
taken from here: http://www.burjdubai.com/
36 mVA !!! that skyscraper is the most energy efficient building on earth.That is less than my cellphone charger draws from grid ! How have they been able to make it so energy efficient !! 36 mVA is equivalent to 36000000 W ?? Woah now they have even invented perpetual motion machine !! Who are these boffins ?

mVA is abbreviation for millivolt-ampere
http://en.wikipedia.org/wiki/Volt_ampere
AC power
http://en.wikipedia.org/wiki/Ac_power

Last edited by agaristagari; May 30th, 2009 at 03:30 AM.
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Old May 30th, 2009, 05:14 AM   #18325
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I think the original poster used the wrong units. It's probably KVA not mVA! Even if it is 36KVA it's very energy efficient.
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Old May 30th, 2009, 05:34 AM   #18326
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Quote:
Originally Posted by Msradell View Post
I think the original poster used the wrong units. It's probably KVA not mVA! Even if it is 36KVA it's very energy efficient.
A single elevator motor would use more than 36kva.
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Old May 30th, 2009, 07:00 AM   #18327
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Hi all.

The BD power scoop ...

With over 160 levels to provide with power and a connected load of 74.15MW and MD of 44.32MW, the installed electrical distribution system for the Burj Dubai is somewhat unusual for a mixed-use building.

High voltage operations

The building is served by a total of twenty 11kV feeders from the Dubai Electricity and Water Authority (DEWA) network. It is also connected to a DEWA 132/11kV substation that is located within the Burj Dubai Development.

Rather than step-down transformers reducing the voltage at the high voltage (hv) incoming supply, here an 11kV power supply is distributed throughout the building via two main risers.

Two separate risers located in the building core serve the full height of the building and operate in parallel to ensure security of supply.

Supplies within the risers provide normal operating power and emergency generating power separately, with emergency generators serving the life safety systems, elevators and general escape lighting.

Five 2200kVA generators provide back-up to the life safety systems in the event of a power failure. Under total or partial power failure the generators will operate via automatic transfer switches (ATS). Battery-operated emergency lighting will also operate within the tower in the event of a mains failure.

The 11kV distribution within the risers has been completed using a four-core, 180mm2 diameter cable. This decision was made as 11kV busbars are more suitable for use in short runs within substations; the flexibilitiy of tap-off points provided by busbar was also not necessary in the building.

Low smoke and fume (LSF) cables have been specified throughout the project in order to reduce the risk of fume pollution in the event of a fire.

The hv distribution serves hv substations within the main MEP floors of the tower at levels 17, 40, 73, 109, 136 and 155. At these points the supply is reduced to 400V and distributed locally by busbar via sub-mains distribution boards. These eventually feed local distribution boards via corridor routes.

Powering up

The main DEWA substation that will serve the Burj Dubai is currently under construction and scheduled for completion around May 2008.

As permanent mains power is thus unavailable during the construction period, the building is connected to temporary power supplies and some local generators.

All hv work on the project has been installed according to Dubai Electricity and Water Authority (DEWA) Regulations, however it is effectively a private network.

The MEP contractor was partly chosen due to their skills with hv installations.

The final testing and commissioning of the systems will be carried out by a separate specialist subcontractor.

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Old May 30th, 2009, 07:16 AM   #18328
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Quote:
Originally Posted by Msradell View Post
I think the original poster used the wrong units. It's probably KVA not mVA! Even if it is 36KVA it's very energy efficient.
I too thought Adam2707 just made a typo. But the error is actually on www.burjdubai.com, under "facts and figures" then "electrical systems".

Impressive figures, Fury. This building will practically be its own city. I wonder what the maximum occupancy number will ever be -- 10,000 people? 50,000? 100,000?

Last edited by Swiddle; May 30th, 2009 at 07:23 AM.
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Old May 30th, 2009, 07:58 AM   #18329
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You WILL like this, very cool! Thanks to "AbulOd"

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Old May 30th, 2009, 10:26 AM   #18330
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Quote:
Originally Posted by Msradell View Post
I think the original poster used the wrong units. It's probably KVA not mVA! Even if it is 36KVA it's very energy efficient.
It's probably MVA, not mVA or kVA !
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Old May 30th, 2009, 10:26 AM   #18331
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Clouds or Sand?

Quote:
Originally Posted by Dubai Spacescraper View Post
You WILL like this, very cool! Thanks to "AbulOd"

Is that a ground hugging low cloud bank over Dubai or a hellacious sand storm?

I couldn't quite tell.
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Old May 30th, 2009, 12:03 PM   #18332
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Probably morning mist...

May 2009:
image hosted on flickr

http://www.flickr.com/photos/[email protected]/3572630229/

image hosted on flickr

http://www.flickr.com/photos/[email protected]/3559823849/
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Old May 30th, 2009, 02:24 PM   #18333
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Quote:
Originally Posted by Land Man View Post
Is that a ground hugging low cloud bank over Dubai or a hellacious sand storm?

I couldn't quite tell.
just fog
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Old May 30th, 2009, 02:43 PM   #18334
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i guess the other U/C BDs in downtown Dubai are slowing....
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Old May 30th, 2009, 03:37 PM   #18335
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compared to the other scrapers in the background, the BD sure is a veritable giant... and a very elegant one at that... It should look beautiful especially when the sun plays with its cladding in the sunset...
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Old May 30th, 2009, 04:11 PM   #18336
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Quote:
Originally Posted by Imre View Post

[IMG]http://i44.************/e0fj9j.jpg[/IMG]

Christ, that's probably the best picture I've seen of this tower. Amazing perspective.
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Old May 30th, 2009, 08:26 PM   #18337
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Yes, I love that place too, it looks really massive from there.
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Old May 30th, 2009, 09:06 PM   #18338
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That's because you can see all the three wings and the setbacks on them.
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Old May 30th, 2009, 11:09 PM   #18339
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Hou, we have 2 Burj Dubais on Google Earth


[IMG]http://i39.************/20pa0x.jpg[/IMG]
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Old May 30th, 2009, 11:52 PM   #18340
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Quote:
Originally Posted by Swiddle View Post
I too thought Adam2707 just made a typo. But the error is actually on www.burjdubai.com, under "facts and figures" then "electrical systems".

Impressive figures, Fury. This building will practically be its own city. I wonder what the maximum occupancy number will ever be -- 10,000 people? 50,000? 100,000?
Well, the Burj Dubai is not very big, no, it has only 3.5 million square feet of area, about the same as the Metlife Building in NY. Buildings with this size generally have about 30 to 40 thousand people inside, but that's nothing unusual, this mediocre building is larger than the Burj Dubai:


source:http://www.nyc-architecture.com/LM/L...ATERSTREET.htm
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adrian smith, burj dubai, burj khalifa, downtown, dubai, dubai tower, emaar, megatall, middle east, rascacielos, sarajevo construction, skyscraper, spire, tallest, uae

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