Case Study on Energy Self-sufficiency Ratio by Building Type and Load Characteristic in Smart Village Community: A Long-term Experimental Evaluation

This study developed an energy-sharing platform technology and conducted a long-term evaluation of the energy self-sufficiency ratio for a smart village community in Busan. This community serves as a large-scale demonstration site to assess the extent to which renewable energy installed in buildings can meet the electricity and thermal energy needs, thereby contributing to greenhouse gas reduction in the building sector. The community comprises 56 residential households, a cultural center, and a community data center. The self-sufficiency ratio for each building was analyzed using long-term data collected over 22 months, from March 2022 to December 2023. In the residential buildings, we examined the self-sufficiency ratio for five major energy loads—heating, cooling, domestic hot water, ventilation, and lighting—across the 56 households, in relation to the renewable energy produced by building-integrated photovoltaics (BIPV). We also assessed the self-sufficiency ratio for the electric vehicle (EV) load installed in the parking lot, which had a minimal impact on the total energy consumption of the residential households. The energy self-sufficiency ratio for the cultural center and the community data center was significantly influenced by their electricity consumption patterns.