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THERMAL CONTROL AND VENTILATION, Used in passive design, Size, Materials,…
THERMAL CONTROL AND VENTILATION
TEMPERATURE CONTROL
Adjustment of temperature to achieve average temperature
Maximum use of sun's energy for heat and natural ventilation
Building strategy based on Thermodynamics
1st Law
Energy transfers from one form to another
2nd Law
Heat constantly move to achieve balance, moving to colder areas because they have light particles and active
Energy Forms
Mechanical
Chemical
Electrical
Atomic
Thermal
Radiant
HEAT
Quantitative measure, with symbol "Q"
SENSIBLE
- Change overall temperature
LATENT
- changes temperature and state of substance
THERMAL CONDUCTIVITY
Rate at which heat transfers through across an area for temperature difference
Q= A x (k/T) x AT
THERMAL EQUILIBRIUM
Achieve balance between supply & demand
Gain/loss
Rise/Fall
Expansion/Contraction
PASSIVE DESIGN
Rise/Fall
light air rises, heavy air falls
Expansion/Contraction
Heat rise= volume expand, Heat cool= contract
VENTILATION
Provision of fresh air to a space
Determined by:
Wind direction
Airflow speed
Windows affect prevailing breeze within the building
FENESTRATION
Strategic placement of windows for ventilation
Window types
Awning Windows
Opens upwards to prevent from rain
Casement windows
Catches wind
Louvered Windows
Allow uninhabited air flow
PASSIVE VENT DESIGNS
Eave and floor ventilation
Operable skylight
Wind scoops
Solar Chimney
Building as a flue
Used in passive design
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Size
Placement
Type
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Materials
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Without it, heavy use of mechanical heating
Must be 5-20% ground floor area opening
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