Reducing unwanted energy transfers Flashcards
most common ways to reduce amount of energy transfers
lubrication and insulation ( using materials with low thermal conductivity)
what is lubrication and what does it do
they reduce frictional forces
why does using thicker walls reduce unwanted energy transfers
because the thicker the walls, the lower their thermal conductivity, meaning the rate of energy transfer will be slowe
why does using thicker walls reduce unwanted energy transfers
because the thicker the walls, the lower their thermal conductivity, meaning the rate of energy transfer will be slower
what is a cavity wall
A gap between two brick walls contains an air , which reduces the energy transferred by conduction through the walls
what is cavity wall insulation
where the air gap between two brick walls is filled with material that has a lower thermal conductivity than air.
what is loft insulation
where a thick layer of material with a low thermal conductivity reduces the rate of heat transfer through the ceiling.
- they reduce convection currents being created in lofts
what are double glazed windows
two sheets of glass with an air gap between them to prevent energy transfer by conduction through the window
what is “wasted energy”
energy that is transferred to a less useful store
what do draught excluders do
around doors and windows and reduce energy transfers by convection
