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CFD: Ventilation and Fire Scenario
Ashish Kadam
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1. Building, as one of the largest industries, has significant impacts on theenvironment and natural resources.
.
all the electricity consumption.
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Poor design of buildings and systems
not only wastes resources and energy
and causes adverse impacts to the
environment, but also creates
uncomfortable and unhealthy indoor
environments.
Smoky View of Pune city
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Thermal
comfort
Ventilation
Energy
ConsumptionFire & Smoke
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Predicts HeatTransfer
Avoid
Over sizing &
Under sizing
Improved
Thermal Comfort
Improved Work
ene s o
CFD Predicts Airflow
Contaminant
Transportation
Avoids all Post
Commissioning
Embarrassments!!
Saves
Environment
!!Green Design!!
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Client
Consultants
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CFD is study of fluid systems that could be static or
dynamically changing in time and space.
The physical characteristics of a fluid in motion, described
usually in the partial differential form.
These equations are discretized using high end computer
algorithms.
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Applications of CFD
1. Site Planning
2. Natural Ventilation Study
3. HVAC System Design
4. Pollution Dispersion and Control5. Fire and Smoke Evacuation Studies
6. Simulation of Emergency Situations
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Site Planning: First Stage of Building Design
Predicts
Distribution of air velocity,
Temperature, Moisture, Turbulence intensity & Contaminant concentration
Benefits
Improves Pediatrician comfort Increase energy efficiency of buildings Plan: natural ventilation for summer Plan: wind break for winter
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Natural Ventilation System
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Fire and Smoke Simulation
Kitchen exhaust
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Limits for Critical Parameters
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CFD examines
1. Locations and Types: Supply and Return
Grills/Diffusers etc.
.
3. System control schedules
4. Active & Passive heating/cooling/ventilation
strategies
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Boundary Conditions: Free Standing Fire
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Case Study: Fire Simulation
Test room of size:
10.78 m x 7 m x 3.8 m
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Tenability Criteria in Fire Scenario
Room becomes untenable if any of the following occurs
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Visible Smoke Spreading after 30 sec
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Flashover after 60 sec in ignition
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Visibility lost after 90 sec
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Comparison: Experimental vs FDS Model
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Temperature at 1.5 m above the floor after 90 sec
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Oxygen volume fraction at 1.5 m above floor after 90 sec
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Thank you
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