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Lecture 2 - Thermal Comfort - Coggle Diagram
Lecture 2 - Thermal Comfort
What is it?
Condition of mind that expresses satisfaction with the thermal environment
Achieved when stable normal body temperature is achieved
Unfavorable climatic conditions cause
Stress on body & mind
Discomfort
Loss of efficiency
Health breakdown / ill
When is it considered uncomfortable?
Under extreme thermal conditions
Heat
Sweat
Cold
Shiver
Design Challenge
Creating a thermally comfortable environment
Environmental Determinants
Air Temperature
Heat transfer through...
Convection
Fluid
Evaporation
Ex: Sweat
Conduction
Solid
Direct contact
Air = bad conductor = good insulator
Doesn't stop heat flow, just slows down
Ex : Feet in contact with floor
Radiation
Vacuum
Electromagnetic waves
Ex : Sun, Campfire
Hot air rises, Cold air sinks
Application
Double volume spaces
Positioning of air conditioner and air heater
Humidity
Amount of water vapour
Saturation
State when no more something can be absorbed
Degree of saturation
Existing amount of water in air VS Max amount it can hold at a given temperature without condensing
Relative Humidity
Amount of water vapour present in air in %
Radiation
Mean Radiant Temperature (MRT)
Uniform temperature of imaginary enclosure where radiant heat from human body similar to radiant heat in the actual non-uniform enclosure
Air Movement
Heat transfer by convection & evaporation in air motion
Allows to flush body heat
Insufficient air motion
Stuffiness
Air stratification
Alleviates body odour & conataminants
Personal Determinants
Clothing
Small air pockets prevent air from migrating through the material
Clo Value
Numerical representation
Activities
Metabolize food into energy
Metabolic rate depends on
Age
Activity (Work)
Bodyweight
Body surface area
Health
Surrounding thermal condition
Case Study