요약2 |
This study applied fuel cells, photovoltaic heat, and geothermal heat, some of new and renewable energy sources, to public office facilities in a complex way, evaluated their economy, environmental effect, technology, and complexity, and calculated a payback period by reflecting changing nominal discount rates to the optimal ratio based on complexity. The research content was summarized as follows: 1) The study tested the reliability of annual energy consumptions of the subject building by the load based on EnergyPlus and the calculations based on the KRESS program with MBE and Cv(RMSE). 2) The optimal ratio of top 5% was obtained with KRESS based on the economy, technology, environmental effect, and complexity of photovoltaic, geothermal, and fuel cell systems. 3) The percentage of fuel cells had big impacts on economy and complexity; that of geothermal heat did on technology; and that of photovoltaic heat did on environmental effect. 4) Every 2% increase of nominal discount rate(NDR) led to an increase of payback period by 3 to 7 years for each alternative. The study also presented a relational expression between NDR and payback period. |