insulation - Sp3

Question 1

in what ways can energy be transferred by heating?

Answer 1

through conduction, convection and radiation

Question 2

what methods of thermal insulation reduce unwanted energy transfer?

Answer 2

placing tinfoil behind radiators, curtains, double glazed windows, cavity wall, loft insulation

Question 3

what are different ways of reducing energy transfer by heating work?

Answer 3

use insulators (anything with low thermal conductivity)
use thicker materials (more air pockets)

Question 4

what does thermal conductivity mean?

Answer 4

how good an object can preserve thermal energy within a contained environment

Question 5

What are the effects of the thickness and thermal conductivity of the walls and its cooling rate

Answer 5

Thickness reduces heat loss as it takes longer for heat to pass through. Thermal conductivity - heat is trapped in air bubbles - conductivity can be increased with cavity walls (stops air circulation + increases air bubbles) - cooling rate = quite slow as there is a lot to get through