Client: Arch groupProject:Silver Star Tower at Buisness bay,Dubai Pressurization Calculation Sheet

Apex/Arch Group 1 31/01/07

Project: 3B+G+6 STOREY OFFICE TOWER

Location: BUSINESS BAY ON PLOT NO:-373-1439

Document: Preliminary Corridor,lobby and lift pressurization calculationPerimeter-59 ft 17.98325levels-10 nos 10ht of each lvl -11.5 3.505211

Staircase pressurization :-

Total wall area of one stairwell = 6785 ft²Total leakage area of wall = 0.74635

number of door open -1 number 21

Total leakage area of doors = ft² considering 3 mm gap at all side of door (all levels) considering (7X3 FT DOOR)1.94 no of doors in stairs = nos (10 nos doors x0 .194)

Pressure difference as per NFPA 92A-1993 in inches of water is 0.1003 inches of water or Pressure difference as per NFPA 92A-1993 in inches of water is 0.2007 inches of water or 50 pa (If sprinkler system is not present in the building for fire suppression)Total CFM required for pressurization = 2610 x ((D11 + D14+D13) x square root of 0.1) (for this project pressure difference considered 5 pa )

6182.137 CFMtotal CFM required (Considering 10 percent of safety factor) = 6800.35 CFM

Power requirment for centrifugal fan at 2 " of WC = 2 KW

Total power requirment all stairs (2 STAIRCASE FANS) = 4 KWThe stairwell will be pressurized by multiple injection method as indicated below and the shaft area requirement is shown in autocad drawing

ft² (As per as ASHRAE application hand book for medium construction leakage area is 0.00011 ft² per ft² of wall area (all levels)

Client: Arch groupProject:Silver Star Tower at Buisness bay,Dubai Pressurization Calculation Sheet

Apex/Arch Group 1 31/01/07

i,e (0.068x0.029)x2=0.194 sq ft per door leakage area

2610 x ((D11 + D14+D13) x square root of 0.1) (for this project pressure difference considered 5 pa )

Client:Arch Group.Project:Silver Star at Business bay,Dubai. Pressurization Calculation Sheet

Apex/Arch Group 3 31/01/07

Project: 3B+G+6 STOREY OFFICE TOWER

Location: BUSINESS BAY ON PLOT NO:-373-1439

Document: Preliminary Corridor,lobby and lift pressurization calculation

Corridor,Lobby and lift pressurization :-

Corridor,Lobby and lift area has to be pressurized to 20 pa with respect to staircase 25 pa ( a minimum pressure difference between stairs and adjacent spaceShould be 5 pa minimum as per NFPA 92A

Total wall area of lobby = 27140 ft²Total leakage area of wall = 2.9854 door open -1 nos 0Total leakage area of door = ft² considering 3 mm gap at all side of door (all levels) i,e (0.068x0.029)x2=0.194 sq ft per door leakage area

1.552 12 no of doors SIZE ( 7 X 3 FT) Pressure difference as per NFPA 92A-1993 in inches of water is 0.0803 inches of water or 20 pa (Considering sprinkler system is present in the building)Pressure difference as per NFPA 92A-1993 in inches of water is 0.1807 inches of water or 45 pa (If sprinkler system is not present in the building for fire suppression)Total CFM required for pressurization = 2610 x (D19 + D21) x square root of 0.0803

3410.673CFM required per floor (Considering 10 percent of safety factor) ] 3751.74two fans of capacity cfm each have been selected cfm each fan capacity

Power requirment for centrifugal fan for pressurization at 2 " of WC = 3 kw approxSince floors above and below are pressurized incase of fire total CFM requirement = 4578 CFM per floor per fan

Client:Arch Group.Project:Silver Star at Business bay,Dubai. Pressurization Calculation Sheet

Apex/Arch Group 4 31/01/07

ft² considering 3 mm gap at all side of door (all levels) i,e (0.068x0.029)x2=0.194 sq ft per door leakage area