Fire in a 5 meter by 4 meter room

[Rumi27]

Thanks for your support. Need to mentioned that I have just started using CFAST only for last three days. Can you pleas help. I am trying to make "a fire in a 5 meter by 4 meter room with a height of 3 meters. A propane burner with a peak heat release rate of 500 kW is located 1 meter from the left wall, centered in Y. The room is ventilated by two mechanical vents: an air supply near the floor on the left wall and an exhaust near the ceiling on the right wall. Both fans start immediately. The walls are made of gypsum wallboard".

&HEAD VERSION = 7700, TITLE = 'Case 20 - Fire Near Wall with Mechanical Vents' /

&TIME SIMULATION = 600.0, PRINT = 60.0, SPREADSHEET = 60.0, SMOKEVIEW = 10.0 /

&INIT PRESSURE = 101325, RELATIVE_HUMIDITY = 50, INTERIOR_TEMPERATURE = 20, EXTERIOR_TEMPERATURE = 20 /

&MATL ID = 'GYPSUM', MATERIAL = 'Gypsum Wallboard', CONDUCTIVITY = 0.17, DENSITY = 800, SPECIFIC_HEAT = 1.09, THICKNESS = 0.0125, EMISSIVITY = 0.9 /

&COMP ID = 'Room1', WIDTH = 5.0, DEPTH = 4.0, HEIGHT = 3.0,
CEILING_MATL_ID = 'GYPSUM', WALL_MATL_ID = 'GYPSUM', FLOOR_MATL_ID = 'GYPSUM' /

&VENT TYPE = 'MECHANICAL', ID = 'MechInlet', COMP_IDS = 'OUTSIDE' 'Room1',
      AREA = 0.2, HEIGHT = 0.5, FLOW = 0.1, OFFSET = 0.5,
      CRITERION = 'TIME', T = 0, F = 1 /

&VENT TYPE = 'MECHANICAL', ID = 'MechExhaust', COMP_IDS = 'Room1' 'OUTSIDE',
      AREA = 0.2, HEIGHT = 2.8, FLOW = 0.1, OFFSET = 4.5,
      CRITERION = 'TIME', T = 0, F = 1 /

&FIRE ID = 'PropaneBurner', COMP_ID = 'Room1', FIRE_ID = 'Burner_source_HRR', LOCATION = 1.0, 2.0, 0.0, FUEL = 'PROPANE' /

&CHEM ID = 'PROPANE', CARBON = 3, HYDROGEN = 8, OXYGEN = 0, HEAT_OF_COMBUSTION = 46000, RADIATIVE_FRACTION = 0.35 /

&TABL ID = 'Burner_source_HRR', LABELS = 'TIME', 'HRR' /
&TABL ID = 'Burner_source_HRR', DATA = 0, 0 /
&TABL ID = 'Burner_source_HRR', DATA = 60, 200 /
&TABL ID = 'Burner_source_HRR', DATA = 120, 500 /
&TABL ID = 'Burner_source_HRR', DATA = 600, 500 /

&DEVC ID = 'SmokeDetector', COMP_ID = 'Room1', LOCATION = 2.5, 2.0, 2.8, TYPE = 'SMOKE_DETECTOR', SETPOINT = 25.0 /

&TAIL /

I am getting this error that tried to fix but it doesn't work:
***Error in &FIRE: Invalid specification for inputs. Check &FIRE input, 1
Error on line 20 of the input file: &FIRE ID = 'PropaneBurner', COMP_ID = 'Room1', FIRE_ID = 'Burner_source_HRR', LO
***Error exit from CFAST, error 1 from routine read_fire
***Error in &FIRE: Invalid specification for inputs. Check &FIRE input, 1
ERROR STOP 1

[mcgratta]

LOCATION is a pair of coordinates, x and y. Include only two numbers.

[Rumi27]

thanks

[preneke]

Yes, because can be a time dependent variable. The x and y coordinates are fixed. From: Kevin McGrattan ***@***.***> Sent: Thursday, May 22, 2025 9:29 AM To: firemodels/cfast ***@***.***> Cc: Subscribed ***@***.***> Subject: Re: [firemodels/cfast] Fire in a 5 meter by 4 meter room (Discussion #2182) LOCATION is a pair of coordinates, x and y. Include only two numbers. - Reply to this email directly, view it on GitHub<#2182 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/ADDV4MFYKSBJYP2PRO4TEJL27XGJ7AVCNFSM6AAAAAB5UVQIGCVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTGMRTGQ4TEOI>. You are receiving this because you are subscribed to this thread.Message ID: ***@***.******@***.***>>

[Rumi27]

thanks

[gforney]

open the Fires tab. Then look for the table with header "Height (m)" . You can change the Z coordinate of the fire at each time the fire is specified at .

@preneke I suggest you change the header from "Height (m)" to "Z position (m)" to be consistent with the X and Y position dialog entries. It took me a while to find the height entries and I wasn't sure whether height referred to the vertical dimension of the fire or the elevation above the floor. after running a case I confirmed it was the elevation above the floor.

[rpeacoc]

Height is the distance from the floor to the base of the fire.

[Rumi27]

thanks

[Rumi27]

Got it now working. Thanks for everyone.

This is wrong - &COMP ID = 'Room1', WIDTH = 5.0, DEPTH = 4.0, HEIGHT = 3.0,
This is correct - &COMP ID = 'Room1', WIDTH = 5.0, DEPTH = 4.0, HEIGHT = 3.0 /

Issues are:
&FIRE Must link to valid FIRE_ID in &TABL, with proper HRR fields
&COMP Use exact syntax with no trailing commas or broken lines
&VENT AREA, HEIGHT, and FACE must be specified
&MECH Should match vent and use realistic FLOW/AREA values
&TABL Include HRR, HEIGHT, AREA, CO_YIELD, SOOT_YIELD (at least)
&DEVC Valid location and type, inside room bounds