Energy transfer

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Under an energy transfer is generally understood as the exchange of energy through a system limit of time. A distinction is made between thermal energy and work . Work is “done” by one system and “done” on the other, as is the usage in thermodynamics . In the energy industry , energy or heat is “supplied” and can be “lost” due to transmission losses.

The transfer of heat can take place in different ways, the use of a heat carrier makes sense for long distances .

Doing work requires “strength”. This can be the mechanical force ( e.g. V-belt ), the torque of a shaft , the pressure in a hydraulic hose , the electrical voltage in the power grid or the chemical potential of an energy carrier .

Whether one should speak of work or heat in the case of radiation transport depends on the circumstances, examples: laser cutting (heat), optical pumping (work).


  • Adolf J. Schwab: Electrical energy systems - generation, transport, transmission and distribution of electrical energy . Springer Verlag, 2006, ISBN 3-540-29664-6 .