Improved primary energy consumption computing method of combined heat and power systems

This paper presents an improved primary energy consumption (PEC) computing method of combined heat and power (CHP) systems. The parameters, specific coal consumption for heating and generation, used in traditional method are uncertainty, so the computing results are inaccuracy. Compared with the traditional method, the improved method integrates the CHP plants´ regulating property with heat demand characteristic and abandons using the uncertainty parameters. The improved method based on integral needs a little more computing time but the results are more accurate. In this study, the PEC of a practical CHP district heating system is analyzed by both improved and traditional method, including “case 1” and “case 2”. The results indicate that the improved method could obtain more precision value than traditional method.