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  1. [21]
    walfaren
    walfaren غير متواجد حالياً
    عضو


    تاريخ التسجيل: Aug 2009
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    الف شكر على المعلومات

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  2. [22]
    إبن جبير
    إبن جبير غير متواجد حالياً
    عضو متميز جداً
    الصورة الرمزية إبن جبير


    تاريخ التسجيل: Apr 2009
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    Ttanks a lot eng'r ricelecteric
    plz. If u have any more Informations abuot Burj Dubai regarding :
    Cables,Sub-station locations,transformers,lighting,A/Cs systems... plz.

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    ]كُلُّ نَفْسٍ ذَآئِقَةُ الْمَوْتِ وَإِنَّمَا تُوَفَّوْنَ أُجُورَكُمْ يَوْمَ الْقِيَـٰمَةِ فَمَنْ زُحْزِحَ عَنِ النَّارِ وَأُدْخِلَ الْجَنَّةَ فَقَدْ فَازَ وَمَا الحْيۈةُ الْدُّنْيَا إِلاّ مَتٰـٰعُ الغُرُورِ[.(185)-آل عمران

  3. [23]
    Eng_YMBIS
    Eng_YMBIS غير متواجد حالياً
    عضو
    الصورة الرمزية Eng_YMBIS


    تاريخ التسجيل: Sep 2009
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    Eng rici . . .. . . . .you are a king
    many thanks

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    لا إلـــه إلا أنـت ســـبـحـانـك إنــــى كــــنـت مــن الــــظالــــمـين

  4. [24]
    ricielectric
    ricielectric غير متواجد حالياً
    عضو متميز
    الصورة الرمزية ricielectric


    تاريخ التسجيل: Nov 2009
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    ABB's contribution includes 50 gas-insulated switchgear units. The robust, lightweight and compact ABB switchgear is well-suited to life in a high-rise, offering long service and taking up little space.

    ABB is also supplying 72 Resibloc distribution transformers, equipment used to regulate the supply of small amounts of power directly to residences. These 72 units were designed specifically for Burj Dubai tower with a flexible enclosure, to fit into a compact space.

    Resibloc transformers are made of pure epoxy resin reinforced with glass fiber rovings, or threads, an enormously strong material that can withstand extreme mechanical stress and thermal shock.

    In addition, the tower uses ABB low-voltage switchgear to send power to all parts of the building, including 37 main distribution boards with electronic circuit monitors, 442 sub-main distribution boards and 1,319 final distribution boards. All equipment was designed and assembled by ABB's subsidiary in Dubai using European components.

    Keeping cool

    Reliable heating, ventilation and air conditioning (HVAC) is an essential function in a country where July humidity reaches 90 percent, the air temperature exceeds 49C, and weeks of blazing sun turn even the sea a soupy 38C.

    Keeping life comfortable in the Burj Dubai tower are ABB’s variable frequency drive panels, consisting of ABB variable-speed drives, designed to control air-handling units, exhaust fans, booster pumps, chilled-water pumps, supply and return air fans, smoke-gas fans and fresh-air fans.

    The introduction of a dedicated ABB drive for heating, ventilation and air conditioning (HVAC) applications is a significant milestone in the development of alternating current (AC) drives. The innovation features a user interface as simple to operate as a mobile phone and direct, understandable instructions in clear text.

    Top monitoring and control system

    Watching over the smooth operation of all the electrical equipment is another ABB contribution, a state-of-the-art power monitoring and control system known as MicroSCADA that integrates unit substations at various levels of the building.

    Supervisory control and data acquisition (SCADA) systems have been around since the 60s, and consist of a network of computers, software, and special hardware to gather and display information and provide operational control of plant and equipment.

    ABB’s MicroSCADA technology offers immediate access to real-time information as well as easy connectivity to other systems. MicroSCADA Pro based systems are designed for local and remote control applications in both electrical and non-electrical processes.


    Installing the final elevators (Otis) is a project on it's own

    . Will include 54 Otis elevators (including 20 Gen2™ elevators and 2 double-deck) and 8 escalators
    •The highest-rise elevator will reach 1,640 feet (500 meters).
    •The fastest elevator, a double-deck, will travel at the rate of 1,969 feet per minute (10 meters per second). That means passengers will be transported up and down at almost 22 miles per hour (35 kilometers per hour). The trip will

    take about 55 seconds

    An express lift taking 90 seconds will run up to the observatory on the 124th floor.
    The Burj Dubai will feature the world's fastest double deck lift, which will hit speeds of 20mph.
    The fastest single lift currently, which goes at 37.5mph, is in the Taipei 101 office tower in Taipei City, Taiwan. This is the
    tallest building in the world at the moment, reaching up 509 metres.
    Cooling system
    To reduce the cooling needed, the double-glazed building's glass units will reflect heat while still allowing high transmission
    of daylight.
    The outside pane has a silver metallic coating to help prevent solar energy from entering while the inner pane has a low
    emissivity coating that reflects the long-wave radiation that comes off the earth's surface as heat at night.
    The tower will nevertheless require about 10,000 tonnes of cooling per hour, where one tonne of cooling is 12,000 times the
    amount of heat that will raise or lower the temperature of one pound of water by one degree Fahrenheit.
    Water that has condensed on the building from the air outside will be collected and used to water the surrounding
    landscape.
    "It's so humid here in Dubai so the cooling system captures a huge amount of water," said structural engineer William
    Baker.
    Condensed water will be collected and piped to a holding tank in the basement car park, from where it will be pumped into
    the landscaping system.
    About 15 million gallons of water will be supplied each year this way - the equivalent of 20 Olympic-sized swimming pools.
    Complex play of forces
    Why has no one ever built something as tall as the Burj Dubai before?
    According to architect Eric Tomich, the increasing weight of buildings as they get taller is not a limiting factor, because in
    terms of structural engineering, wind forces are a bigger consideration.
    Other variables come into play so that costs rocket once you get above 80 to 90 storeys - and this puts developers off
    climbing higher.
    "There is a premium to keep going higher. The further up you go, the less economic the building becomes.
    "There are certain inefficiencies, such as the number of lifts needed and the higher specification needed to push utilities and
    systems up. You have equipment and building infrastructure running over a longer distance."
    "It's a lot more complex exercise producing an ultra tall building than it is creating ten 40-storey towers," he said.
    Tomich said developer Emaar's desire to produce a landmark building for the Burj Dubai Downtown development meant that
    these extra hurdles were worth overcoming.
    "The economics of creating an ultra tall building are balanced by its being part of a larger estate.
    It would be much more difficult to do this as a solitary building," he said.
    Cleaning of windows
    An elaborate system will clean the Burj Dubai's windows.
    At several different levels, there are openable panels in the building's façade that will allow machinery to pass and attach
    itself to rails on the outside.
    Using the rails, the machinery will move horizontally, carrying a cradle that contains people who will clean the windows.
    Pumping of water
    Water pipes 36 inches in diameter will carry chilled water high up into the Burj Dubai for use in the building's cooling
    systems.
    Water used for fire protection sprinklers and hydrants, and for tap water, is pumped up and held in tanks. Gravity then
    produces the flow when water is used.
    Power supply
    Architect Eric Tomich said "very large" electrical cables will supply power through the tower, which will have its own
    electrical substations.
    Fire safety
    A major factor in designing the tower was fire safety and speed of evacuation.
    When doing calculations, designers assumed the tower contained 35,000 people ? although in reality the number is likely to
    be less than half this.
    Concrete surrounds all stairs and there is a 5,500kg capacity elevator for firefighters and building service work.
    "People cannot be expected to walk down 160 floors, so there are pressurised air-conditioned refuge areas approximately
    every 25 floors where they could wait safely or rest on the way down," said architect Eric Tomich.
    Officials will not reveal how long a total evacuation would take, but insist they are "very happy" with how the building would
    perform in an emergency.
    "We've looked at different scenarios and the focus is on ensuring people can leave safely and easily," said Greg Sang,
    Emaar's assistant director, projects.
    Concrete mixtures
    Many different concrete mixtures will be used in the Burj Dubai.
    Various admixtures - chemical or physical additives - are put into the basic mix to produce the different types.
    Certain concrete types resist heat, hydration or cracking, while yet more flow well in pipes so they can be sent to the part of
    the building where they will be used easily.
    Some concrete will be pumped up to 500 metres and it must retain its properties while it is being transported."
    _________________

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    Knowledge Is Power


    المواضيع منقولة فالرجاء الدعاء لكل من ساهم فى وصول المواضيع اليكم ولا أسألكم سوى الدعاء.

    بالعلم نتقدم...

  5. [25]
    ricielectric
    ricielectric غير متواجد حالياً
    عضو متميز
    الصورة الرمزية ricielectric


    تاريخ التسجيل: Nov 2009
    المشاركات: 684
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    broj dubai

    broj dubai

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    الصور المرفقة
    Knowledge Is Power


    المواضيع منقولة فالرجاء الدعاء لكل من ساهم فى وصول المواضيع اليكم ولا أسألكم سوى الدعاء.

    بالعلم نتقدم...

  6. [26]
    ضرار الرفاعي
    ضرار الرفاعي غير متواجد حالياً
    عضو فعال جداً


    تاريخ التسجيل: Dec 2007
    المشاركات: 172
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    تحياتي لك اخي العزيز وجزاك الله خير الجزاء .

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  7. [27]
    إبن جبير
    إبن جبير غير متواجد حالياً
    عضو متميز جداً
    الصورة الرمزية إبن جبير


    تاريخ التسجيل: Apr 2009
    المشاركات: 1,202
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    Eng rici thank you for this inrormations as eng-YMBIS said
    . yuo are a king, thanks a lot we are waiting yuor new



    0 Not allowed!


    ]كُلُّ نَفْسٍ ذَآئِقَةُ الْمَوْتِ وَإِنَّمَا تُوَفَّوْنَ أُجُورَكُمْ يَوْمَ الْقِيَـٰمَةِ فَمَنْ زُحْزِحَ عَنِ النَّارِ وَأُدْخِلَ الْجَنَّةَ فَقَدْ فَازَ وَمَا الحْيۈةُ الْدُّنْيَا إِلاّ مَتٰـٰعُ الغُرُورِ[.(185)-آل عمران

  8. [28]
    مسلم يوسف
    مسلم يوسف غير متواجد حالياً
    عضو فعال


    تاريخ التسجيل: Feb 2008
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    وجزاك الله خير الجزاء

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  9. [29]
    ricielectric
    ricielectric غير متواجد حالياً
    عضو متميز
    الصورة الرمزية ricielectric


    تاريخ التسجيل: Nov 2009
    المشاركات: 684
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    more pictures for borj dubai

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    الصور المرفقة
    Knowledge Is Power


    المواضيع منقولة فالرجاء الدعاء لكل من ساهم فى وصول المواضيع اليكم ولا أسألكم سوى الدعاء.

    بالعلم نتقدم...

  10. [30]
    ricielectric
    ricielectric غير متواجد حالياً
    عضو متميز
    الصورة الرمزية ricielectric


    تاريخ التسجيل: Nov 2009
    المشاركات: 684
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    burj dubai armani-hotel-floorplan

    burj dubai armani-hotel-floorplan

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    الملفات المرفقة
    Knowledge Is Power


    المواضيع منقولة فالرجاء الدعاء لكل من ساهم فى وصول المواضيع اليكم ولا أسألكم سوى الدعاء.

    بالعلم نتقدم...

  
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