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Explain why the heat flow for a home is different in the winter vs. the summer.

Explain why the heat flow for a home is different in the winter vs. the summer. 24.5 Heat Engines and the Second Law. When heat energy flows in any heat engine from a high-temperature place to a low-temperature place, part of this energy is transformed into work output. .

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Explain why the heat flow for a home is different in the winter vs. the summer.

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  1. Explain why the heat flow for a home is different in the winter vs. the summer.

  2. 24.5Heat Engines and the Second Law When heat energy flows in any heat engine from a high-temperature place to a low-temperature place, part of this energy is transformed into work output. Thermal energy (or heat) is converted to mechanical energy out (work). waste heat is exhausted.

  3. 24.5Heat Engines and the Second Law Heat Engine Physics A steam turbine engine demonstrates the role of temperature difference between heat reservoir and sink.

  4. A steam turbine engine demonstrates the role of temperature difference between heat reservoir and sink. Heat Engine Physics Thermal energy transferred to water reaches heat of vaporization—phase change of liquid to gas. Expanding gas increases pressure inside pipe Pressure does work on the turbine, causing it to turn Original heat of vaporization is released when energy is transferred to the turbine. Gas condenses into liquid.

  5. 22. How do natural systems tend to proceed?

  6. 24.6Order Tends to Disorder Natural systems tend to proceed toward a state of greater disorder. The universe trends from a higher state to a lower state of organization. Examples: Air flows from high to low pressure Heat flows from hot to cold

  7. 24.7Entropy According to the second law of thermodynamics, in the long run, the entropy of a system always increases for natural processes.

  8. 24.7Entropy Entropy is the measure of the amount of disorder in a system. Disorder increases; entropy increases.

  9. 24.7Entropy This run-down house demonstrates entropy. Without continual maintenance, the house will eventually fall apart.

  10. Heat Transfer Processes

  11. Starter 4 • Solve problems 26-28 found on pg. 426. • Specific Heat Table is on pg. 413 • For problem 26, see specific heat of iron found in problem 25.

  12. Fuel Sources for Heating • Wood • Coal • Oil • Natural Gas (methane) Methane CH4

  13. radiator Water-filled pipes Circulate a heated fluid Heat a fluid Burn a fuel

  14. Circulate a heated fluid Heat a fluid Burn a fuel

  15. Convection, Conduction or Radiation? • Stick in campfire • Hot air balloon rising • Hot concrete surface at pool • Lizard sunning itself on a rock • Pan of soup warming on the stove • Foot on cold tile floor • Conduction • Convection • Radiation • Radiation • Convection • Conduction

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