Energy conversion technologies
Every energy system converts primary energy to end-use energy, useful energy and finally energy services. Three crucial technologies determine the amount of energy services obtained from a unit of primary energy:
Tf technologies for transforming primary energy to end-use energy, i.e. technologies of the transformation system; T1 technologies for transforming end-use energy to useful energy, i.e. technologies of the application system; Ts technologies for transforming useful energy to energy services, i.e. technologies of the service system._
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