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Thermal Energy Transfer

Thermal Energy Transfer. Thermal Energy Transfer. Thermal Energy can be transferred by three methods Conduction Convection Radiation. Conduction. Conduction is the transfer of thermal energy by contact between particles of matter from a high temperature to a low temperature

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Thermal Energy Transfer

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  1. Thermal Energy Transfer

  2. Thermal Energy Transfer • Thermal Energy can be transferred by three methods • Conduction • Convection • Radiation

  3. Conduction • Conduction is the transfer of thermal energy by contact between particles of matter from a high temperature to a low temperature • Heat moves faster through solids and liquids • This is because the particles are closer together

  4. Convection • Convection is the transfer of thermal energy by the partcles of a fluid • Fluids are liquids and gases • Currents transfer heat from high temperature to low temperature • As a fluid heats up it expands and becomes less dense • This heated fluid will then rise above fluid of a lower temperature

  5. Radiation • Radiation is the transfer of energy by electromagnetic waves • It can travel through space where there is no matter • This is radiant energy

  6. Radiation • Materials can absorb, reflect, or transmit radiation • Dark colors absorb radiation • Light colors reflect radiation

  7. Radiation can pass through the particles that make up solids liquids and gases

  8. Insulators • An insulator is a substance that heat flows slowly through • They will have a high specific heat • Gases make good insulators because they do not conduct heat well

  9. THermodynamics

  10. Using Heat • On of the most basic ways of using heat is to heat your home • Most homes used a forced air system that pumps warm air into a room and heat the room by convection

  11. Radiators • Older buildings may use radiators • A radiator uses steam to heat rooms by convection

  12. Thermodynamics • You can increase the thermal energy of an object with out adding heat • Thermodynamics is the study of the relationship between thermal energy, heat, and work

  13. 1st Law of Thermodynamics • The increase in thermal energy of a system equals the work done on the system plus the heat transferred to the system

  14. 2nd Law of Thermodynamics • It is impossible for heat to flow from a cool object to a warmer object unless work is done. • If you hold ice in your hand, heat flows from you to the ice cube

  15. Engines • Heat can be converted into work • A heat engine is a device that turns heat into work • It is impossible to make an engine that completely converts heat into work • This is because it will violate the second law of thermodynamics

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