1. Heat Transfer

2. Heat Movement Heat always moves from warm to cold.
Your body loses heat it doesn’t get cold.
To stay warm you must stop heat loss
3 Ways Heat Moves
Conduction
Convection
Radiation

3. Conduction Heat moving through materials Good Conductors:
Metals, water, ground
Poor Conductors (Insulators)
Air, wood, plastics, straw, Closed cell foam, dry organics

4. Conduction (continued)
Avoiding heat loss through conduction:
Sleeping
Get off of the Ground
Tools
Don’t touch metal handles
Hands
Wear gloves (water proof)
Feet
Thick soled boots on ice
Stay Dry

5. Convection Heat causes materials to move Warm air rises cool air falls
Must stop cold air from circulation next to the body
Cinch Straps and Draw Strings
Sleeping Bags
Coats
Gloves
Convection Destroys your natural warm air blanket

6. Convection (continued)
Convection Ovens
Forced air furnace
Vent placement
Cold air return
Ceiling fans
Vents in houses and ice houses
Dead Air Spaces

7. Radiation Heat moving through empty spaces (photons) Heat from sun
Heat from a fire
Need to warm both sides
Dark materials gather more heat
Most winter clothing is a dark color
You are all beings of light and brighten up my day
Infrared cameras sense radiant body heat

8. Radiation (continued)
Gather Radiant heat
Dark clothing, Ice houses, shingles
Reflect heat back to body:
Space blanket, white on inside
Altitude increases effect (less atm)
Sunburn
Snow blindness

9. Heat Loss Prevention Stay Dry
Sweating makes you wet and then dries your skin out
Stay off of the ground
Stay out of the snow
Cover head and extremities
Air is a great insulator
Layer Clothing

10. The End