Definition: Combined heat and power
Combined heat and power
The production of electricity and heat from a single process. Almost synonymous with the term cogeneration, but slightly more broad. Under the Public Utility Regulatory Policies Act (PURPA), the definition of cogeneration is the production of electric energy and "another form of useful thermal energy through the sequential use of energy." Since some facilities produce both heat and power but not in a sequential fashion, the term CHP is used.
- Cogeneration power plants produce electricity but do not waste the heat this process creates. The heat is used for district heating or other purposes, and thus the overall efficiency is improved. For example could the efficiency to produce electricity be just 20%, and the overall efficiency after heat extraction could reach be 85% for a cogeneration plant. It has to be considered that there is not always use for heat., Combined heat and power, also called cogeneration, is a technology where electricity and steam or electricity and hot water are produced jointly. This increases the efficiency compared to separate electricity and heat generation. (IEA, 2014), Bioenergy cogeneration describes all technologies where heat as well as electric power are output products of a bioenery power plant.
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