Unit 3 pp #8 7th grade

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Unit 3 pp #8 7th grade

  1. 1. Section4 Heat Technology<br />Chapter 11<br />Heating Systems<br /><ul><li>Hot–Water Heating The high specific heat of water makes it useful for heating systems.</li></li></ul><li>Section4 Heat Technology<br />Chapter 11<br />Heating Systems, continued<br /><ul><li>Warm–Air Heating Air cannot hold as much energy as water can. But warm–air heating systems are used in many homes and offices in the United States. </li></li></ul><li>Section4 Heat Technology<br />Chapter 11<br />Heating Systems, continued<br /><ul><li>Heating and Insulation A material that reduces the transfer of thermal energyis called insulation. When insulation is used in walls, ceilings, and floors, less heat passes into or out of the building.
  2. 2. Solar Heating The sun gives off a huge amount of energy. Solar heating systems use this energy to heat houses and buildings.</li></li></ul><li>Section4 Heat Technology<br />Chapter 11<br />
  3. 3. Section4 Heat Technology<br />Chapter 11<br />Heat Engines<br /><ul><li>A heat engine is a machine that transforms heat into mechanical energy, or work.
  4. 4. Heat engines burn fuel through a process called combustion.
  5. 5. External Combustion Engines A simple steam engine is an example of an external combustion engine, and is explained on the next slide. </li></li></ul><li>Section4 Heat Technology<br />Chapter 11<br />Heat Engines, continued<br />
  6. 6. Section4 Heat Technology<br />Chapter 11<br />Heat Engines, continued<br /><ul><li>Internal Combustion Engines A car engine is an internal combustion engine.
  7. 7. Fuel is burned inside the engine. The fuel used is gasoline, which is burned inside the cylinders. The cylinders go through a series of steps in burning the fuel.</li></li></ul><li>Section4 Heat Technology<br />Chapter 11<br />Cooling Systems<br /><ul><li>Cooling systems are used to transfer thermal energy out of a particular area so that it feels cooler.
  8. 8. Cooling and Energy Most cooling systems require electrical energy to do the work of cooling. The electrical energy is used by a device called a compressor. The compressor does the work of compressing the refrigerant. The refrigerant is a gas that has a boiling point below room temperature, which allows it to condense easily.</li></li></ul><li>Section4 Heat Technology<br />Chapter 11<br />Cooling Systems, continued<br />
  9. 9. Section4 Heat Technology<br />Chapter 11<br />Heat Technology and Thermal Pollution<br /><ul><li>One of the negative effects of excess thermal energy is thermal pollution, the excessive heating of a body of water.
  10. 10. Thermal pollution can happen near large power plants, which are often located near a body of water.</li>

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