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task library
built templatedesign-firewith-tool

T Squared Hrr

Calculates design fire heat release rate using the t-squared growth model HRR = alpha t^2, with an explicit peak HRR cap. The template reports the unclipped HRR, peak-limited HRR, time to peak, and a numeric cap indicator for deterministic fire safety scenario checks.

inputs

3 fields

context

3 archetypes

engine

with-tool

outputs

4 scored fields

contract fields

Parameter Map

3 inputs to 4 scored outputs

  • growth_coefficient_kw_s2

    float

    T-squared fire growth coefficient alpha

    0.001 to 0.2kW/s^2

  • time_from_ignition_s

    float

    Time from ignition

    0 to 1800s

  • peak_hrr_kw

    float

    Peak heat release rate cap

    100 to 20000kW
unclipped_hrr_kwtol 0.03

Unclipped t-squared heat release rate

hrr_at_time_kwtol 0.03

Heat release rate at time after applying peak cap

time_to_peak_stol 0.03

Time from ignition to reach peak HRR

peak_limitedtol 0.01

Numeric peak-limit indicator: 0 no, 1 yes

visibility contract

Difficulty Ladder

all_giveneasy

All parameters given for a slow-growth design fire

all fields visible
all_givenmedium

All parameters given across slow and medium growth fires

all fields visible
all_givenhard

All parameters given for faster growth or peak-limited fire scenarios

all fields visible

scenario bands

Archetype Atlas

slow_growth_fire

2 contexts

Slow-growth design fire for low-combustibility occupancy

growth_coefficient_kw_s20.002 to 0.006
time_from_ignition_s120 to 900
peak_hrr_kw1000 to 6000

office-tenancy / station-concourse

medium_growth_fire

2 contexts

Medium-growth design fire for mixed fuel load occupancy

growth_coefficient_kw_s20.008 to 0.02
time_from_ignition_s90 to 700
peak_hrr_kw2000 to 10000

retail-tenancy / workshop-area

fast_growth_fire

2 contexts

Fast-growth design fire for high fuel load storage or plant areas

growth_coefficient_kw_s20.04 to 0.12
time_from_ignition_s60 to 500
peak_hrr_kw3000 to 20000

warehouse-storage / plant-room-fire

rendered task

Generation Preview

retail-tenancy-medium-growth-fire-preview

difficulty
hard
visibility
all_given
archetype
medium_growth_fire
site context
retail-tenancy
instruction excerptt-squared-hrr_calc.py

visible fields

  • growth_coefficient_kw_s20.008 to 0.02 kW/s^2
  • time_from_ignition_s90 to 700 s
  • peak_hrr_kw2000 to 10000 kW

withheld schema

unclipped_hrr_kwhrr_at_time_kwtime_to_peak_speak_limited
Medium-growth design fire for mixed fuel load occupancy. retail-tenancy. Required outputs: unclipped_hrr_kw, hrr_at_time_kw, time_to_peak_s, peak_limited