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Heat transfer

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(Conduction)
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Where
Where
 +
 +
      Q = Heat conducted (W)
       k = Thermal conductivity of the material (W/m-K)
       k = Thermal conductivity of the material (W/m-K)
-
       A = Cross-sectional area of the object parallel to heat conduction
+
       A = Cross-sectional area of the object parallel to heat conduction (m2)
       T = Temparature (K)
       T = Temparature (K)
-
       X = Length of the object
+
       X = Length of the object (m)
== Convection ==
== Convection ==

Revision as of 11:04, 1 December 2005

                     == Conduction ==
  • Conduction can be defined as the heat transfer through a substance because of a temperature gradient. The rate of heat transfer by conduction between two regions of a substance is proportional to the temperature difference between them. The constant of propotionality is called thermal conductivity of the material.
  • Mathematically, it can be described by using the Fourier's law:

                Q_{Conduction} = -k*A*dT/dX

Where

     Q = Heat conducted (W)
     k = Thermal conductivity of the material (W/m-K)
     A = Cross-sectional area of the object parallel to heat conduction (m2)
     T = Temparature (K)
     X = Length of the object (m)

Convection

Radiation

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