Study on Hybrid Utilization of Renewable Energy and Fuel Cell for Residential Energy System : Part 2-Operating results on electric power and domestic hot water supply and evaluation on optimization of PEFC capacity

Abstract

This paper constitutes Part 2 in the series of studies on hybrid utilization of renewable energy and the fuel cell for a residential energy system. First, three kinds of experiments applied typical electric power and hot water demands were carried out. The primary energy reduction rate of the double DSS operation to a conventional system reached 24%. Second, the amount of the primary energy reduction in Sapporo in winter surpassed the experimental results for the standard energy demands. Therefore, it was clarified that this system has a high degree of feasibility in the cold region. As a result of simulations on the grid-connected fuel cell cogeneration system without the reverse power flow, the optimum capacity of the fuel cell was 0.9kW at the double DSS operation for the typical energy demands. It is possible to miniaturize the fuel cell capacity, when the reverse power flow is accepted.