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Thermal Energy STEM Lab

Thermal Energy STEM Lab. Which gives off more Carbon Dioxide (air pollution) a house or a car?. House. Most energy consumed in homes comes from burning fossil fuels, like coal, oil, and natural gases. On average Americans spends $241 billion on energy bills. Uses of energy.

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Thermal Energy STEM Lab

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  1. Thermal Energy STEM Lab

  2. Which gives off more Carbon Dioxide (air pollution) a house or a car? House • Most energy consumed in homes comes from burning fossil fuels, like coal, oil, and natural gases. • On average Americans spends $241 billion on energy bills.

  3. Uses of energy

  4. Which household function uses the most energy? • Heating • Hot Water • Lighting • Cooking

  5. A thermogram shows the distribution of heat over the surface of a house. It highlights where heat is being lost. The white, yellow and red areas are the warmest, so these are the worst insulated parts of the house. The blue and green areas are the coolest, so these are the best insulated parts of the house. A poorly insulated house loses more energy and so costs more to heat. It also means that more pollution, particularly carbon dioxide, is created in order to heat the house.

  6. Heat loss from houses Where is the most heat lost from a poorly insulated house? roof 20% windows 12% walls 36% doors 4%

  7. How can heat loss through a roof be reduced? Loft insulation contains trapped air and so forms an insulating layer between the loft and the rest of the house. This helps to reduce heat loss through the roof. heat loss The air warmed by radiators (and other heaters) is carried around a house by convection currents. The house becomes heated but, if there is no roof insulation, the warm air continues to rise. loft insulation The heat eventually escapes through the roof and is lost due to conduction through the roof tiles.

  8. Can heat loss through windows be reduced? insulating layer of air A lot of heat energy can be lost through windows. side-view of double glazing Double glazing adds an extra pane of glass. The air trapped between the two panes acts as an insulator and reduces heat loss by conduction. The problems with double glazing are that it can be expensive and that it is difficult to break in emergencies without a special hammer.

  9. How can heat loss through doors be reduced? A lot of heat energy can be lost from a house due to heat escaping through gaps under doors and around windows. This is one of the easiest types of heat loss to prevent. You can purchase spongy strips that can be used to close the gaps around doors and windows.

  10. How can heat loss through be reduced? convection currents in the cavity Most outside walls have an empty space between the two layers of bricks called a cavity. The air trapped in the cavity acts as an insulator and reduces any heat loss due to conduction through the bricks. foam insulation prevents convection currents Heat loss can also occur due to convection within the cavity. Plastic foam insulation can be pumped into the cavity to prevent this.

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