page_title: Energy recovery
section_title: Electric Turbo Compound (ETC)
hierarchical_section_title: Energy recovery / Examples / Electric Turbo Compound (ETC)
caption_attribution_description: English: TG cross section.
context_page_description: Energy recovery includes any technique or method of minimizing the input of energy to an overall system by the exchange of energy from one sub-system of the overall system with another. The energy can be in any form in either subsystem, but most energy recovery systems exchange thermal energy in either sensible or latent form.
  In some circumstances the use of an enabling technology, either diurnal thermal energy storage or seasonal thermal energy storage, is necessary to make energy recovery practicable. One example is waste heat from air conditioning machinery stored in a buffer tank to aid in night time heating. Another is an STES application at a foundry in Sweden. Waste heat is recovered and stored in a large mass of native bedrock which is penetrated by a cluster of 140 heat exchanger equipped boreholes that are 150m deep. This store is used for heating an adjacent factory as needed, even months later. An example of using STES to recover and utilize natural heat that otherwise would be wasted is the Drake Landing Solar Community in Alberta, Canada.
context_section_description: Electric Turbo Compounding (ETC) is a technology solution to the challenge of improving the fuel efficiency of gas and diesel engines by recovering waste energy from the exhaust gases.
caption: Electric Turbo Compound (ETC) cross section
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