GCSE: OCR gateway: P1: Heating Houses
- Created by: 09tvzutphen
- Created on: 11-04-14 19:29
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- P1
- Heating Houses
- Energy Flow
- Energy in the form of heat flows from a warm body to a colder body
- Measuring Temperature
- Thermogram
- White/yellow is hot; black/blue is cold
- Temperature is a measure of hotness on an arbitary scale
- Heat is the measurement of internal energy on an absolute scale
- Thermogram
- Specific Heat Capacity
- Energy needed to raise 1kg of material by 1`c
- Divide value in J by 1000 to get it in K/J
- Specific Latent Heat
- The energy needed to melt/boil 1kg of material
- When an object changes state energy is transfered but the temperature remains constant
- Energy is used for breaking the bonds
- Energy Flow
- Keeping Homes Warm
- Practical Insulation
- Double Glazing
- Reduces energy loss by conduction
- Gap between two peices of glass filled with a vacuum
- Reduces energy loss by conduction
- Particals in gas far apart so difficult to transfer energy
- No particals in a vacuum so its impossible for energy to be transfered by conduction
- Loft Insulation
- Reduces energy loss by conduction + convection
- Warm air in the home rises
- Energy is transfered through the ceiling by conduction
- Air in loft warmed by top of ceiling and is trapped by loft insulation
- Both sides of the ceiling are at the same temperature so no energy is transferred
- Without the loft insulation warm air would move by convection currents and heat the roof tiles
- Energy transferred to the outside by conduction
- Without the loft insulation warm air would move by convection currents and heat the roof tiles
- Both sides of the ceiling are at the same temperature so no energy is transferred
- Air in loft warmed by top of ceiling and is trapped by loft insulation
- Energy is transfered through the ceiling by conduction
- Warm air in the home rises
- Reduces energy loss by conduction + convection
- Cavity Wall Insulation
- Reduces energy loss by conduction and convection
- Air in the foam is a good insulator
- Air cannot move by convection because it is trapped in the foam
- Air in the foam is a good insulator
- Reduces energy loss by conduction and convection
- Shiny foil in insulation blocks
- Reduces energy transfer by radiation
- Energy from the sun reflected back in the summer keeping house cool
- Energy from home reflected back in keeping house warm in the winter
- Reduces energy transfer by radiation
- Double Glazing
- Practical Insulation
- Heating Houses
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