Energy transer by heating

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  • Created by: Annagc
  • Created on: 10-11-16 18:15
What is infrared radiation
heat energy travelling through the air as waves
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Properties of a solid
can't be compressed, high density, strong bonds, fixed position
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properties of a liquid
can't be compressed, high density , particles can move
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properties of a gas
can be compressed, fast moving particles
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What is conduction
heat transfer in a solid
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Describe conduction in a metal
when heated the free electrons gain kinetic energy and diffuse through the metal collising with ions giving them kinetic energy
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What is convection
heat transfer in fluids
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describe convection
particles gain energy and spread out, the fluid is now less dense so it rises, away from the heat the particles cool fall
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Why are radiators black
black is a good emitter of radiation so it transfers energy quicker
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how to you increase evaporation
increases temperature, movement and increase surface area
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explain the cooling effect of evaporation
when the fastest particles escape they take energy with them so the average enrgy of the liquid is less
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What is specific heat capacity
the amount of energy to change one kg by 1 degree
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what is the equation for specific heat capacity
E = m * c * 0
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What is the unit for specific heat capacity
J/kg*C
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How does cavity wall insulation work
two layers of wall and a gap is filled with foam which traps air, reducing heat loss by convection
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What is U-value
the rate at which energy is lost from a building, the lower the U-value the better the insulator
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how do solar panels work
absorb energy from the sun to heat up water pipes
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what is payback time
how long it takes to recover the cost of fitting the insulation
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How do you calulate payback time
cost divided by the saving
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How can you reduce heat loss in the home
loft insulation, cavity wall, draught proofing, carpet, thick curtains, double glazing, hot water tank jacket
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how is heat lost through a window
the warm air passes throught eh glass by conduction, when it hits the glass it cools causing a convection current which slows conduction through the second window
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Other cards in this set

Card 2

Front

Properties of a solid

Back

can't be compressed, high density, strong bonds, fixed position

Card 3

Front

properties of a liquid

Back

Preview of the front of card 3

Card 4

Front

properties of a gas

Back

Preview of the front of card 4

Card 5

Front

What is conduction

Back

Preview of the front of card 5
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