A total of 115 operating test points have been investigated on a cogeneration industrial 200 kWe gas engine at Ecole des Mines de Nantes, with load varying between 50 and 100 per cent, spark advance between 8° and 20° crank angle and air excess in the range 1.3-1.7. The analysis provides a mathematical correlation giving the influence of load variation and other parameters on the thermal power, the natural gas inlet power, the electrical efficiency and the global efficiency with an accuracy better than 2 per cent.
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