Insulation Flashcards
what does the u-value of a material tell you
how good an insulator it is. The lower the value the better an insulator it is
what is specific heat capacity
the amount of energy needed to raise the temperature of 1kg of a material by 1 degree centigrade
unit for SHC
J/Kg degrees centigrade
why is double glazing s better insulator than single glazing
the double glazing traps air between the layers. Air is a bad conductor. Trapped air reduced heat transfer by convection
how does loft insulation or cavity wall insulation reduce heat transfer
the air transferred between the fibres of the insulation. Air is a bad conductor. Trapped air can not circulate so this reduces the heat transfer by convection.
how do solar panels containing water work
they absorb the radiation from the sun, heating the water which can be used to heat buildings or provide hot water
