Stairwel and Lobby Pressurization Calculation

Client: Arch group Project:Silver Star Tower at Buisness bay,Dubai

Pressurization Calculation Sheet

Project: 3B+G+6 STOREY OFFICE TOWER Location: BUSINESS BAY ON PLOT NO:-373-1439 Document: Preliminary Corridor,lobby Corridor,lobby and lift pressurization calculation Perimeter-59 ft levels-10 nos ht of each each lvl -11. -11.5 5

17.98325 10 3.50 .505211 5211

Staircase pressurization :Total otal wall all area area of one one stai stairw rwel elll = Total Total leakag leakage e area area of wall wall =

6785 6785 0.7463 0.74635 5

number of door open -1 number

21

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

Tota Totall leak leakag age e area area of door doors s =

ft² ft² cons consid ider erin ing g 3 mm gap gap at all all side side of door door (all (all level levels) s) cons consid ider erin ing g (7X3 (7X3 FT DOOR 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 water is 0.1003 inches of water water o 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) Tota Totall CFM CFM requ requir ired ed for for pres pressu suri riza zati tion on = 2610 2610 x ((D1 ((D11 1 + D14+ D14+D1 D13) 3) x squa square re root root of 0.1) 0.1) (for (for this this proj projec ectt pres pressu sure re diff differ eren ence ce cons consid ider ered ed 5 pa ) 6182.1 6182.137 37 CFM total CFM required (Considering 10 percent of safety factor) = 6800.35 CFM Power requirment for centrifugal centrifugal fan at 2 " of WC =

2 KW

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

 Apex/Arch Group

1

31/01/07

Client: Arch group Project:Silver Star Tower at Buisness bay,Dubai

Pressurization Calculation Sheet

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

 Apex/Arch Group

1

31/01/07

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

Pressurization Calculation Sheet

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 space Should be 5 pa minimum as per NFPA 92A

Total wall area of lobby = Total leakage area of wall = door open -1 nos Total leakage area of door =

27140 2.9854 0

ft²

ft² considering 3 mm gap at all side of door (all levels) i,e (0.068x0.029)x2=0.194 sq ft per door leaka 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 3410.673 CFM required per floor (Considering 10 percent of safety factor) ] 3751.74 two fans of capacity cfm each have been selected cfm each fan capacity Since floors above and below are pressurized incase of fire total CFM requirement = 4578 CFM per floor per fan Power requirment for centrifugal fan for pressurization at 2 " of WC = 3 kw approx

 Apex/Arch Group

3

31/01/07

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

Pressurization Calculation Sheet

ge area

 Apex/Arch Group

4

31/01/07