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14-6 Latent Heat

14-6 Latent Heat. Latent Heat *Latent heat is heat required to make a state change occur…there is no temperature change. *Q= mL …. Where L is a latent heat value you would look up on a chart and m is mass. *see pg 425 chart. * See Examples 14-8 and 14-9. Heat Transfer: Conduction.

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14-6 Latent Heat

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  1. 14-6 Latent Heat Latent Heat *Latent heat is heat required to make a state change occur…there is no temperature change. *Q=mL …. Where L is a latent heat value you would look up on a chart and m is mass. *see pg 425 chart. * See Examples 14-8 and 14-9

  2. Heat Transfer: Conduction • The 3 types of heat transfer are conduction, convection, and radiation • Conduction is the movement of heat by direct contact. • [DQ/Dt]=(kA) [(T1-T2 )/l] see pg 429 for k • Conductors carry heat well, insulators not so well. • k is the thermal conductivity constant • See Example 14-11

  3. 14-8 Heat Transfer: Convection • Convection is the movement of heat in fluid currents. • Forced convection is man-made…fans, AC, Central heat etc…

  4. Heat Transfer: Radiation *Radiation is the movement of heat as infra-red, electromagnetic radiation. (DQ/Dt)=esAT Stefan-Boltzmann equation s= Stefan-Boltzmann constant e= 5.67x10-8 W/m2 K4 = emissivity (DQ/Dt)=esA(T41 – T42 ) Net flow of radiation See example 14-13 and 14-14 p434/435 1350W/m2 is the solar constant. (DQ/Dt)=(1000W/m2) eAcosQ 1000W/m2) actually reaches Earth’s surface.

  5. Homework • Due Friday EOP • 22-24,28,32-36,40 page 439/440 • Test Monday

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