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The principles of the use of 'combined heat and power' (CHP) for the achievement of fuel energy conservation, minimisation of environmental impact and economic advantage are explained. A distinction is made between the two types of outputs: heat and work. It is argued that an efficiency value that is defined as the sum of the heat and work outputs divided by the energy of the fuel used is not very meaningful. An alternative, rational, efficiency is explained. It is concluded that CHP is an option to be considered where both heating and power are required, but is not a general alternative to high-efficiency electricity generating stations.
McGovern, J.: CHP and Energy Conservation. The Engineers Journal, Dublin, vol. 40, no. 7, pp. 27 & 29. September, 1995. doi:10.21427/p1zx-ba79