Smoke Ventilation Calculation

8/18/2019 Smoke Ventilation Calculation

1/8

CFM CALCULATION

FIRE AREA

FIRE PERIMETER P=

Y=HEAT RELEASE

.188 PY^(3/2) =

HEAT RELEASE RATE

SPECIFIC HEAT

Ø=

AMBIENT TEMP

TEMP OF SMOKE LAYER

DENSITY OF AIR AT AMBIENT TEMP

MECHANICAL VENTILATION

A=

HEI!HT OF BOTTOM OF CLEARLAYER

" =

MASS FLO# OF HOT !ASESENTERIN! THE SMOKE LAYER M =

A $ "= %=CP=

TEMP. RISE OF SMOKE LAYERABOVE AMBIENT TEMP %F/(MF$C&)=

T'= T' Ø= TC=

ρ0=

(M $ T) / (ρ0Τ0)= V=


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*S%.M

12 M

2.+M

2,'K#/S%.M

K!/S

K#

1.'1K-/K!.K

C

3'3K

K

1.2K!/C.M

C.M/S

0CFM


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RESTARANT AND CAF0.

!ROP 1

CEMENT #ORKS.

BTCHERS SLA!HTEROSES.

PO#ER STATIONS.CREAMERIES AND #HOLESALE DAIRIES.

BAKERIES AND BISCIT MANFACTRERS.

!ROP 2MOTOR CAR REPAIR SHOPS AND LAR!E MOTOR !ARA!ES.

MOTOR VEHICLES AND ACCESSORIES MANFACTRERS.

COTTONSPINNIN! MILLS

!ROP 3

BLEACHERS DYE #ORKS.PRINTIN! OFFICES.BRSH MANFATRERS.

TANNERIES LEATHER !OODS MANFACTRERS.CEREAL MILLS !RINDIN! AND PEELIN! MILLS.

RADIO AND TELIVISION MANFACTRERS.

SOAP AND #A PRODCTS MANFACTRERS. TETILES AND CARPETS MANFACTRERS.

SOND RADIO FILM AND TELIVISION STDIOS.#OOLS AND #ORSTED MILLS.S!AR #ORKS AND REFINERIES.

CELLLOID.

!ROP 4

PAINTS SEALIN!#A RESIN TRPENTINE SOOT TAR.FIRE#ORKS LI!HTIN! !OODS.

FLOOR COVERIN! LINOLEM.

AIRCRAFT HAN!ERS.

#OOD#OOL.FORM RBBER FORM !OODS.

CHEMICAL #ORKS #ITH LITTLE FIRE HA5ARD (OTHER#ISE!ROPS AND 4).

MACHINE FACTORIES INCLDIN! LI!TH METALMANFACTRERS.

RBBER ARTICLES MANFACTRERS( ECLSIVE OF FOAM

RBBER ).PLASTIC AND PLASTIC PRODCTS MANFACTRERS(ECLSIVE OF FORM).

CARDBOARDPAPER AND PAPER PRODCTSMANFACTRERS.

SA#IN! MILLS AND #OODSIN! MANFACTRERS(INCLSIVE OF FRNITRE FACTORIES).


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ELECTRICAL APPARATS.

!ROP +/1

PRESS#OOD BOARDS.!LASS AND CERAMIC !OODS.

TETILES.

FOOD.

METAL !OODS.CARPETS.

PHARMACEITICALS !OODS AND COSMETICS.

!ROP +/2

PAPER CARDBOARD.

ROOFIN! FELTS (TARRED BOARD) (STACKED HORI5ONTALLY).

VENEERN! BOARDS OR TIMBER.

FRNITRE.

CORK.PLASTIC PRODCTS(ECLSIVE OF FOAM).VARNISH IN TINS (PACKED IN CARDBOARD).PAPER ROLLS (STORED HORI5ONTALLY).FLOOR COVERIN!.

ROOFIN! FELTS IN ROLLS (STORED VERTICALLY).

!ROP +/3

RBBER !OODS.#OOD !OODS

OIL AND #A PAPER.CARDBOARD AND PAPER ROLLS (STORED VERTICALLY).

CELLLOSE.

CELLLOID.

!ROP +/4

FORMS AND PLASTICS (PACKED AND NPACKED) AND ALLPRODCTS PACKED IN FORM MATERIAL.

#OODEN PALLETS #OODEN BATTENS AND STACKS OF#OOD PENETRABLE TO AIR.

SCRAPS OF PLASTIC OR FORM RBBER AND STORED FOAMROLLS AND LATE FORM RBBER.


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FIRE AREA(S%.M)

FIRE PERIMETER(M)

A= * P=12

A =2'.2+ P=18

A=3, P=24

A=81 P=3,


6/8

A=* P=12

A=2'.2+ P=18

A=3, P=24

A=81 P=3,


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HEAT RELEASE RATE

CONTENTS HEAT RELEASE RATE (K#/S%.M)

CRAVED FRNITTRE 1''VEHICLES PETROL PLASTIC 2,'

STACKED TIMBERS 3*'BOOKS FRNITRES *3

STACKED CARDBOARD 32'STACKED CHIPBOARD 8,ELECTRICAL !OODS 31'

CARDBOARD CARTONS ,2'CARDBOARD REELS 21'

PACKED !OODS +4'

OTHER DATA ON HEAT REALESE PER NIT FLOOR AREA OF FLLY INVOLVEDCONBSTIBLES (ASSMIN! 1''6 COMBSTION EFFICIENCY ) IS PRESENTED IN TABLE

41 NFPA 2'4M (1*8,)


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Smoke Ventilation Calculation