Please enable JavaScript.
Coggle requires JavaScript to display documents.
Lecture 3 - Thermal Control and Ventilation - Coggle Diagram
Lecture 3 - Thermal Control and Ventilation
Temperature Control
What?
A process to measure temperature changes and the way heat gets in/out of a space and adjust to achieve a desire average temperature
Thermodynamics
Knowledge used in passive heating and cooling design
First Law
Energy cannot be created or destroyed, but can be transformed from one form to another.
Second Law
Absorbed heat will constantly move to attain equilibrium throughout building mass
Heat constantly seek out cooler regions
Hotter objects loses energy, Colder objects gain energy
6 Energy Forms
Thermal
Radiant
Mechanical
Chemical
Electrical
Atomic
Heat (Q)
Sensible Heat
Changes temperature only
Latent Heat
Changes temperature and state of substance
QI - Symbol of heat needed to change state of material without changing the temperature
Thermal Conductivity
Direct molecular interaction
Time rate transfer of heat through thickness (T) across unit area (A) for a unit difference in temperature (AT)
Qc = A x (k/T) x AT
Thermal Equilibrium
Heat achieving balance between supply and demand
Passive Design
Heat rises, volume expands Heat cools,volume contracts
Ventilation
How?
Removed air gets replaced
Proper location and size of vent
Adjustable openings and insulations in vent
Determinants
Airflow speed
Airflow Direction
Window / Openings placement
UBBL
Openings 5% to 20% of floor area
Types of Windows
Awning window Allows air, keeps rain away
Casement Window Catch or buffer wind
Louvers : Allow unhabitated air flow
Types
Eave and Floor Vents
Operable skylight
Wind scoops
Solar chimney
Building as a flue
Case Study