reducing energy loss Flashcards
what should you use to reduce conduction?
materials with a low thermal conductivity
what are materials with low thermal energy called?
insulators
how to reduce convection?
convection currents must be prevented from forming
the fluid must be prevented from moving
what is the effectiveness of an insulator dependant on?
thermal conductivity
the density of the material
the thickness of the material
the lower conductivity=
less energy transferred
more dense=
more conduction
what are the particles like in denser materials?
closer together so they can transfer energy to one another more easily
the thicker the material=
the better it will insulate
why does insulating the loft of a house lower its rate of cooling?
less energy is transferred to the surroundings
what are lofts normally made from?
fibreglass
what is fibreglass?
reinforced plastic- made of woven materials of glass fibres laid across and held together
what is air trapped between the fibres good for?
a good insulator
what is another method of insulation in houses?
cavity wall insulation
what is cavity wall insulation?
filling the cavity with foam- lowers the conduction of heat through the walls from the inside to the outside
