Abstract
An optimization method has proposed for the renewal planning of energy systems installed into buildings, and the effectiveness is verified through a numeric calculation. This enables us to derive the optimal renewal planning logically without the judgment by intuition and the experience. In the mathematical optimization formulation, the annual total cost of the system is minimized in consideration of system's operational strategy corresponding to seasonal and hourly energy demands requirement. Using this optimization method, to give consideration to not only economic but also energy saving, the optimal renewal planning for buildings was clarified, which decide renewal year and selection and capacity of equipment.
