Energy Transfer Flashcards
What’s the transfer in a solid?
Solid particles have least energy
Can’t move but they vibrate around a fixed point
What’s the transfer in a liquid?
Heating a solid gives the particles enough energy to move around
Transfer in a gas?
Further hearing gives particles enough energy to move quickly
What’s infrared radiation?
Dark surfaces emit and absorb heat
Shiny surfaces are good reflectors
What’s conduction?
Conduction is the transfer of heat energy without the substance itself moving
Are metals good conductors?
Yes metals are good conductors -
Metal gets hot the tightly packed particles gain more energy and vibrate
When does conduction appear
Conduction happens in non-metal solids the particles can pass energy by vibration
What’s convection?
Convection is the transfer of heat energy through movement
What’s condensation
The gas condenses into a liquid the energy is then released and the temperature increases
When does condensation occurs?
Occurs in cold surfaces which forms water vapour
What’s evaporation?
Liquid evaporated when particles have gained enough energy to turn in a gas
What’s a U-value
It’s where a material indicates how effective a material is as an insulator
What’s the equation for payback time?
Total cost of improvements // savings per year
Where does conduction go in houses
Through walls,floor and roof
Where does convection go in houses?
Convection currents coupled with cold draughty from gaps
