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Sep 18, 2022 · The three types of heat transfer are conduction, convection, and radiation. Heat transfer occurs when thermal energy moves from one place to another. Atoms and molecules inherently have kinetic and thermal energy, so all matter participates in heat transfer.
The rate of heat transfer by emitted radiation is determined by the Stefan-Boltzmann law of radiation: \(\mathrm{\frac{Q}{t}=σAT^4}\) where \(\mathrm{σ=5.67 \times 10^{−8} \; \frac{J}{s⋅m^2⋅K^4}}\) is the Stefan-Boltzmann constant, \(\mathrm{A}\) is the surface area of the object, and \(\mathrm{T}\) is its absolute temperature in kelvin.
The rate of energy transfer, more commonly called heat transfer, is measured in Joules/second (kcal/hr or Btu/hr). Heat transfer plays a major role in the design of many other devices, such as car radiators, solar collectors, various components of power plants, and even spacecraft.
A hot, less-dense lower boundary layer sends plumes of hot material upwards, and cold material from the top moves downwards. Heat transfer is a discipline of thermal engineering that concerns the generation, use, conversion, and exchange of thermal energy between physical systems.
In this animation, you will explore heat transfer with different materials. Experiment with heating and cooling the iron, brick, and water. This is done by dragging and dropping the object onto the pedestal and then holding the lever either to Heat or Cool.
Heat transfer always results from temperature differences, but there are three different modes of transfer, each with their own unique properties.
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Each method has unique and interesting characteristics, but all three have two things in common: They transfer heat solely because of a temperature difference, and the greater the temperature difference, the faster the heat transfer (Figure \(\PageIndex{1}\)).
