Abstract
Economic feasibility of microturbines as cogeneration application is investigated. For this purpose, the relationships between the installation number of microturbine cogeneration units and maximum energy demands are surveyed based on an optimization approach. A method to obtain a maximum energy demand for which the optimal installation number changes is proposed by combining an optimal unit sizing problem and a non-linear equation with this problem as a lower level one. In the optimal unit sizing problem, equipment capacities except for microturbine cogeneration unit and utility maximum contract demands are determined together with the systems operational strategies so as to minimize the annual total cost subject to satisfaction of energy demand requirements. Based on this method, a map expressing the relationships between the optimal installation number and the maximum energy demands is illustrated. Through numerical studies for a hotel and an office building, the economic feasibility of the microturbine cogeneration system is clarified.
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