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1.1 What is heat transfer?

The heat transfer from one medium to another is controlled by a few simple but fundamental rules:

  • There must be a temperature difference in order for energy transfer to take place.
  • Energy (heat) will always flow from the warmer medium towards the colder medium.
  • The energy (heat) rejected from the warm medium is equal to the heat absorbed by the cold medium plus losses to the surroundings

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