Since the middle of this century the growing fact of the unexpected environmental conditions and the rapid increase in the energy consumption have resulted in the fact that the efficient use of the energy and to exploit a new and renewable energy resources are inevitable. In the recent years, increasing importance in the issue of the best use of available energy resources are discussed with the application of the combined heat-power plants. In this paper, the performance of the conventional energy plants and combined heat-power plants are compared. For this reason a new design criterions for the combined heat-power plant are introduced here.
The rationality of these new design criterions are tested in thermal energy and gas turbine plants. The obtained results are then compared with the conventional energy plants. It is proven that this new design methodology will provide more energy saving and minimize the heat losses that is produced during energy production.