Combined heat and power (CHP) is the simultaneous generation of useful heat and electricity. Micro CHP systems replace the boiler in conventional central heating systems (typically single household). Technologies include external heat engines (e.g. Stirling, Rankine cycle), internal combustion engines (e.g. Otto cycle), fuel cells and Thermophotovoltaic systems. Micro CHP is sometimes known as residential CHP or residential cogeneration.
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