Abstract
The pape analyzes the optimum cogeneration system (CGS) for the reduction of greenhouse pases. The paper compares the CGS characteristics for building types, system structure, power grid connection and operation patterns. The result shows that houses have the greatest potential to reduce greenhouse gases among variety types of buildings and power grid connection of houses is essential for the reduction. Heat storage is effective particularly for cost reduction, and it may be also important for cooperative operation of CGS with power grid due to flexibility inoperation time. Comparison of fuel cell and gas engine is also made.
