AT&T America's Center 4th Floor Remodeling
Existing fourth floor has a total approximate area of 50,000 square feet of space. Of the 50,000 square feet, only one quarter of the space is occupied, that area being the “NW” corner of the building. The remaining three quadrants (SW, SE and NE) are presently empty. Under this project, these areas will be totally refurbished to accept personnel from other areas.
The entire fourth floor is cooled by two large chilled water air handling units. Existing AHU04A serves the NW and the SW quadrants while existing AHU 04B serves the NE and SE quadrants. The existing medium pressure supply air distribution systems consists of flat oval mains, (with a double wall section from units to first taps) round branches and terminating in old Carrier “moduline” air terminals (combination VAV box and diffuser) most of which are malfunctioning and/or not functioning at all.
Under this project, existing galvanized steel supply air systems (2) shall be all taken out from quadrants SW, SE, NE and replaced with new medium pressure, galvanized steel supply air ductwork systems (and re-connected to existing air handling units) complete with new variable air volume boxes, galvanized steel ductwork, (downstream of boxes) flexible ductwork, terminating in new air distribution devices, (along with new r/a devices) and controls for new boxes.
With exception of existing rooms 242 and 427, (actually one large room) existing AHU04B serves existing unoccupied SE and NE quadrants and will be able to be de-energized 100% only “after” these two rooms are disconnected from said unit and connected to existing AHU04A thru new s/a ductwork, and a new variable air volume box (with a new thermostat). This work will be done before beginning with any other work and work shall be done after hours.
Also, since existing AHU04A serves existing NW and SW quadrants and NW quadrant “must” remain operational, contractor shall provide/install a new zone damper on main branch which serves the entire SW quadrant.
Said damper shall also be installed at the beginning of the project after hours. NW quadrant will also be provided with several new zone dampers since it has been determined that existing modulines boxes will not be able to handle the new duct pressures. Also, refurbished areas shall be provided with eighteen (18) new carbon dioxide sensors in order to implement demand control ventilation and thus save energy.
The work shall be done in three phases.
Design Completion Date: June 2013
AT&T FT Lauderdale Annex CO New Chiller Plant
Existing chiller plant presently consists of the following equipment:
1 existing 130 ton air cooled chiller.
2 existing 52 ton air cooled chillers.
2 existing chilled water pumps – 20 HP each – 442 GPM each (one stand-by). Each with a variable frequency drive.
Existing chiller plant has several deficiencies. They are as follows:
Two existing 52 ton air cooled chillers have reached the end of their useful service life and need replacement.
Existing chiller plant no longer has redundancy capacity “and” building equipment heat loads are increasing.
Owner has decided to build a new water cooled chiller plant “inside the building (in basement) with a starting capacity of 159 ton and with enough room for the installation of a “future” second 159 ton water cooled chiller. The two existing 52 ton air cooled chillers and large sections of chilled water piping will be removed. Existing chilled water pumps (and their respective variable frequency drives (2) located inside second floor air handling unit room) shall also be removed and replaced with new larger pumps and VFD’s. Existing air separator and expansion tank in same room shall remain.
The new basement floor chiller plant, at minimum shall consist of the following equipment:
1 new 159 ton water cooled chiller (with space and connection for a 2nd 159 ton water cooled chiller).
2 new dual-arm chilled water pumps – 60 HP each – 765 GPM each (one stand-by) each pump with a new VFD.
2 new dual-arm condenser water pumps – 25 HP each – 900 GPM each (one stand-by) each pump with a new VFD.
1 new 160 ton cooling tower – 7.5 HP motor, a new galvanized steel support structure, (for 2 towers) along with new city water connections, drain piping, emergency well water piping, sunblock algae balls. Ecology cells and connections for future tower.
1 new complete emergency well water pump system.
1 new refrigerant monitor/purge system.
1 new Siemens energy management system for entire new chiller plant.
1 new water leak detection system.
1 new motorized volume damper (with controls) for chiller plant along with r/a transfer opening (each with FD).
1 new water evacuation system (entire chiller room will be diked).
Only one chilled and condenser water pump shall run. The other pump will be 100% redundant.
New basement chiller plant shall be connected to existing chilled water system at first floor chiller yard by using valved piping presently connected to existing 52 ton air cooled chillers. New connections to existing 130 ton Trane air cooled chiller will require a “pipe freeze” to replace existing valved connections which are damaged.
Both existing 52 ton air cooled chillers shall run while this work is being done. Under no condition shall the existing chilled water system be de-energized.
Existing 4”ø “rapid deployment chiller connection” PVC piping at first floor level shall be removed entirely and replaced with new 6”ø schedule 80 PVC piping (identical routing – re-use existing supports) all painted and identified.
The work shall be done in three phases.
Design Completion Date: November, 2013
AT&T Boca Main CO New Chiller Plant.
Mechanical engineering/design to remove existing roof mounted air cooled chillers and replace with 2-206 ton 0.62KW/ton water cooled chillers to be installed indoors. 2-215 Ton Cooling Towers with factory low sound option will be installed on the roof. Each cooling tower will have a 10 HP fan motor with Variable Frequency Drive (VFD). The two (2) existing chilled water pumps will be replaced with 1 Dual Arm Armstrong chilled water pump set, each of the 2 pumps in the Dual Arm Armstrong pump set will have its own VFD and it will be sized to pump enough chilled water flow to satisfy the 2-206 Ton chillers (1,000 GPM, 130 feet TDH and 60 HP motor) at 60 hertz. The second 1,000 GPM, 130 feet TDH, 60HP pump will be 100% stand-by. New Armstrong condenser water pumps will be installed in the same room as the chillers.Each of the 2 condenser water pumps will have its own VFD and it will be sized to pump enough condenser water flow to satisfy the 2-206 ton chillers (1,290 GPM, 60 feet TDH and 30 HP motor) at 60 hertz.The second 1,290 GPM, 60 feet TDH, 30 HP condenser water pump will be 100% stand-by. There was new condenser water piping and major modifications to existing chilled water piping and major upgrades to existing EMS in addition to Ashrae 15 Refrigerant monitoring and exhaust system in chiller room.
Design Completion Date: October 2011
Construction Completion Date: December 2012
AT&T Palm Beach Gardens CO Chiller Plant Upgrades
Mechanical engineering/design to add 1 new 175 Ton water cooled screw chiller in a new chiller room on the 2nd floor and 3 new cooling towers on the ground, upgrade EMS and expand it to control all above new equipment, major chilled water and condenser water piping modifications, specify 2 new chilled water pumps with VFD’s and 2 new condenser water pumps.
Design Completion Date: May 2010
Construction Completion Date: March 2011
AT&T Delray Beach CO New AHU’s and Ductwork.
Mechanical engineering/design to add 2 new 22,000 CFM each (100% redundancy) stacked VAV chilled water AHU’s in a new 1st floor AHU room. These new AHU’s will cool the entire 1st floor area. New 48” x 36” main supply duct will run from new 1st floor AHU’s to be located in the extreme south end of the 1st floor to the north side of 1st floor where new and future telephone equipment will be installed and existing 1st floor Multizone AHU and associated ductwork and chilled water piping will be removed.
Also, 2 new 15,000 CFM each (100% redundancy) stacked VAV chilled water AHU’s will be added in an existing 2nd floor AHU room. These new AHU’s will cool the North area of the 1st floor.
New chilled water piping was added for all 4 new AHU’s and major upgrades were made to existing EMS.
Design Completion Date: August 2011
Construction Completion Date: December 2012
AT&T Palmetto CO New Chiller Plant
Mechanical engineering/design of a new 500 ton water cooled chilled water plant consisting of 2 – 250 ton water cooled screw chillers, 2 – 250 ton SS counterflow cooling towers with VFD’s, 2 condenser water pumps with VFD’s (one of which is 100% redundant), 2 chilled water pumps with VFD’s (one of which is 100% redundant), well and well pump for emergency cooling tower make-up water, Lakos condenser water filtration system, cooling tower city water make-up, EMS controls, refrigerant monitoring and exhaust system and major piping work to convert building from existing 250 ton air cooled chiller plant to new 500 ton water cooled chiller plant.
Design Completion Date: September 2012
Construction Completion Date: May 2013
AT&T Hollywood Main CO Major Chiller Plant Upgrades
Existing three story building has a chiller plant which contains two water cooled chillers; one is a recently installed Trane 125 ton. The second chiller is an old Carrier 80 ton chiller which will be removed and replaced with a new Trane 125 Ton. Chiller plant has two existing chilled water pumps and two existing condenser water pumps. All four existing pumps will be removed and replaced with new larger pumps (along with their associated piping, electrical, VFD’s, drain piping, valves, conc. Pads, and etc).
In addition, the chiller plant will be provided with a new refrigerant monitor/purge system and the plant will be provided with air conditioning (presently being supplied conditioned air thru an existing 12x 6 s/a grille with no way of controlling flow) thru a new variable air volume box.
At the roof, there are two existing cooling towers. One is a Marley 150 ton “quadraflow” which is operational and the second is a 100 ton cooling tower which is damaged beyond repair. This cooling tower will be removed (along with its existing piping, electrical, controls, support structure, and etc) and replaced with a new 132 ton stainless steel cooling tower. New cooling tower will be installed on top of new cooling tower support structure (with a new arch. Screen enclosure) which will be big enough to accommodate a “second” future cooling tower.
Design Completion Date: January, 2013
Construction Completion Date: December, 2013
AT&T Canal CO Chiller Plant Upgrades
Engineer/design/specify the replacement of all existing PVC condenser water piping in chiller plant with new welded steel piping, design phase testing to measure condenser and chilled water flows at each piece of major chiller plant equipment, replacement of existing chilled water pumps with new larger ones for redundancy purposes, air condition chiller plant, add refrigerant monitoring and exhaust systems in Chiller Room as required by FBC and Ashrae Standard 15, upgrade lighting in chiller room because it is inadequate at the present time, replace existing chiller plant room doors (1 set double door and 3 single doors), add water leak detector(s) and associated controls.
Repair Spaulled Beam East Wall of Chiller Room, Cooling Tower side. Provide a Concrete Step Platform at Door 5 from Chiller Room to Cooling Tower Area, Seal and Paint exterior of Chiller Room Walls (East Wall, South Wall, and West Wall) and remove existing Floor Drains and replace with new Floor Drains including floor drain piping on 2nd floor.
Design Completion Date: July 2012
AT&T Naranja CO New Sanitary Lift Station and Connection of Building to Miami-Dade County Sanitary Line.
Civil, Plumbing and Electrical engineering design for removal of existing Septic Tank, add a new lift station and connect building to existing street sanitary main.
Design Completion Date: October 24, 2008