1998 年 64 巻 619 号 p. 1021-1028
Economic feasibility of cogeneration systems with a fuel cell is investigated in consideration of its failures. An optimal unit sizing method is extended to this case so that it enables to consider probability of the failures. Equipment capacities and maximum contract demands of utilities are determined so as to minimize an expectation value of the annual total cost by taking account of the system's operational strategy to satisfy hourly changing energy demands even if fuel cell's failures happen. Parametric studies are carried out to investigate the influence on economy of the length of down time due to the failures, the repair cost of the fuel cell or annual average frequency of failures. Through the studies, it is found that the failures of the fuel cell greatly influence system's economy, and that the aforementioned parameters greatly change equipment capacities and economy of the fuel cell cogeneration system.