抄録
Recently, cogeneration systems(CGS) are regarded as a main role of urban energy systems since they provide both electricity and thermal energy at the same time. However, the total energy efficiency depends on the energy demand pattern. Wheeling and thermal energy transportation systems are therefore expected to improve the total efficiency.
In this paper, the authors develop a model to evaluate the effects of cogeneration systems with wheeling and thermal energy transportation systems. This model consists of three steps. In the first step, this model minimizes the total cost under the given the electricity and thermal energy demand and generates the optimal capacity and operation patterns of CGS without wheeling and heat transportation system. In the second step, the minimized cost with them is calculated. Since the difference of the minimized cost between the above two steps represents their additional benefits, it is calculated among the cogenerator, consumer and electric power company by the tariff systems in the third step. Mixed integer programming model is also employed to see the partial load characterictics of CGS.
The simulation results show the followings: (1)The optimal capacity of CGS increases by wheeling and thermal energy transportation systems. (2)Office and retail building can be efficient cogenerators when wheeling and thermal energy transportation systems are available. (3)The charasteristics of tariff systems to distribute the total benefit of wheeling and thermal energy transportation are clarified.
