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energy transfer by heating (infrared radiation (black body radiation…
energy transfer by heating
infrared radiation
hotter the object-more infrared radiation being emitted
black body radiation
radiation emitted by a body
that absorbs all radiation incident on it
all objects emit and absorb infrared radiation
temp increase if object absorbs more radiation than emits
heating and insulating buildings
solar panels
absorb infrared radiation from sun
cheap way of heating home
fitted on roof usually facingsouth
generate electricity directly
how can rate of energy transfer from houses be reduced
cavity wall insulation
double-glazed window
loft insulation
aluminium foil behind radiators
specific heat capacity
amount of energy need to change temperature of 1 kg of substance by 1 degree Celsius
energy transferred=mass x specific heat capacity x temperature change
greater mass of object, slower its temp increases
transfer by conduction
best conductor is metal
best insulators
fibre glass
wool
higher thermal conductivity of material-high rate of energy transfer
thicker layer of insulator-lower rate of energy transfer