Download - 9 Total Transfer of Thermal Energy
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TOTAL TRANSFERTOPIC 9: TRANSFER OF THERMAL ENERGY
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TOTAL TRANSFER OF THERMAL ENERGY IN
EVERYDAY APPLIANCESWe need to consider these factors:
The purpose /
function of
the
appliances
Keep The
Thermal Energy
In
Minimize HeatLoss
Maximize Heat
Absorption
Maximize
Internal IR
Reflection
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TOTAL TRANSFER OF THERMAL ENERGY IN
EVERYDAY APPLIANCESWe need to consider these factors:
The purpose /
function of
the
appliances
Keep The
Thermal Energy
Out
Maximize Heat
Loss
Minimize HeatAbsorption
Maximize
External IR
Reflection
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POLYSTYRENE CONTAINERS
Hot Food Cold / Frozen Food
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Container Lid
POLYSTYRENE CONTAINERS
Hot Food
Material of the container
Components of the container
Non-metal, polystyrene (Has trapped air)
-> Insulator - trap and minimise heat
from being conducted away to the
surrounding. (minimise conduction)
- stops heated air from rising and
transferring heat to the surrounding.
- prevents formation of convection
current.
White in colour.
-> Worst emitter of IR. (min. radiation)
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POLYSTYRENE CONTAINERS
Cold / Frozen Food
Material of the container
Non-metal, polystyrene (has air pockets)
-> Insulator - minimise heat from beingconducted into the box.
White in colour.
-> Worst absorber of IR.
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TAKE-AWAY CUPS
Hot Drinks Cold Drinks
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TAKE-AWAY CUPS
Hot Drinks
Material of the container
Components of the container
Container Lid
Non-metal, paper.
-> Insulator - prevents heat from being
conducted away to the surrounding.
- stops heated air from rising and
transferring heat to the surrounding.
- prevents formation of convection
current.
White in colour.
-> Worst emitter of IR.
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TAKE-AWAY CUPS
Material of the container
Non-metal, plastic.
-> Insulator - minimise heat from being
conducted into the cup.
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THERMOS FLASK
Plastic stopper
Silvered inner walls
Hot or Cold contents
Vacuum
Plastic outer casing
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THERMOS FLASK
Components of the thermos flask
Plastic stopper
Silvered inner walls
Hot or Cold contents
Vacuum
Plastic outer casing
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COOKING POTS
Function ?
Thermal Transfer ?
Materials / Components ?
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SOLAR PANELS
Function ?
Thermal Transfer ?
Materials / Components ?
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TOTAL TRANSFER OF THERMAL ENERGY IN
ROOMS / BUILDINGSRooms and buildings in temperate / cold countries need to keep
the thermal energy in.
Keep The
Thermal Energy
In
Minimize Heat
Loss
from the Roof
from the Windows & Doors
from the Walls
from the Floors
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TOTAL TRANSFER OF THERMAL ENERGY IN
ROOMS / BUILDINGSRooms and buildings in temperate / cold countries need to keep
the thermal energy in.
Minimize Heat
Loss
from the Roof
from the Walls
use of lagging materials to
line the ceiling / attic areas
use of double walls with insulating
materials in between the walls
use of non-metal materials
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TOTAL TRANSFER OF THERMAL ENERGY IN
ROOMS / BUILDINGSRooms and buildings in temperate / cold countries need to keep
the thermal energy in.
Minimize Heat
Loss
from theWindows &
Doors
from the Floorsuse of carpets to cover all
the floors
use of double glazed windows
use of sealed doors
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TOTAL TRANSFER OF THERMAL ENERGY IN
ROOMS / BUILDINGS
Keep The
Thermal Energy
Out
Maximize Heat
Loss
Minimize HeatAbsorption
Maximize
External IR
Reflection
Rooms and buildings in warm / hot countries need to keep the
thermal energy out.
from the Roof
from the Windows
from the Walls
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TOTAL TRANSFER OF THERMAL ENERGY IN
ROOMS / BUILDINGS
Minimize Heat
Absorption
Rooms and buildings in warm / hot countries need to keep the
thermal energy out.
from the Walls use of white / light colours for
the outside walls
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TOTAL TRANSFER OF THERMAL ENERGY IN
ROOMS / BUILDINGS
Maximize Heat
Loss
Maximize
External IRReflection
Rooms and buildings in warm / hold countries need to keep the
thermal energy out.
from the Roof
from the Windows
use of dark coloured metal
use of reflective, glass windows