Energy Efficiency for Heat Engine Implementation into Systems of Cogeneration

Cogeneration, the procedure of simultaneous and combined producing of two energies, makes a real saving of primary energy (fuel) in comparison with separate producing of these two energies. This fuel saving is found under the economic aspect into fuel expenses reducing and under the ecologic aspect into environment pollution reducing and primary energy resources increasing. Cogeneration equipment with heat engines represents an energy efficiency increasing method itself if someone takes into account following technical economic points of view: - the recovery of combustion gases heat before the evacuation into atmosphere; - the recovery of cooling water heat of engine sub equipments; - the electricity cost reducing under the National Grid cost, through elimination of all transporting and distribution taxes and also of intermediary companies taxes; - the thermal energy cost reducing, much under the heat cost from centralized heat providing system. This type of energy is obtain from recovery and is based on produced electricity, so the only costs are parts of consumed elements (filters, supplementary water, so) costs and personnel salaries; - total efficiency is superior to other power equipments, so eta(gl) > 86%; This paper underlines, using energy efficiency analysis methodology, the heat engine implementation into cogeneration systems and also energy, ecological and economic efficiency of cogeneration concept. Also, the methodology is validated through a case analysis.