| 요약2 |
Purpose: The purpose of the present study was to analyze design factors for energy conservation and the initial cost for zero energy building rating systems through case studies. Method: First, design factors for energy conservation were selected and these were referred the building energy saving design standard. These were insulation of wall, roof, and floor, thermal property of door and window, high-efficient mechanical ventilation and the installation ratio of LED. There were three levels for energy saving strategies. Level 1 was the building energy code and level 2 was the future energy code which will implement from Sep. 1, 2018. In the level 3, about 20% of thermal performance was better than level 2. Second, the primary energy consumption of the case study by level was analyzed by using ECO2. Lastly, the energy self-sufficiency ratio of zero energy building rating systems was computed by considering renewable energy systems and the cost of them was also calculated. Result: The primary energy reduction ratio by thermal performance of wall, roof, and floor and window and door was 2%-3% and about 3%, respectively. By designing the mechanical ventilation and the installation of LED, the energy reduction were about 8% and 9%. To certify the zero energy building 5 rating system, the cost of renewable energy was about 35,000 KRW per square meter. For future research, development of applicable renewable energy systems in each unit of multi-family residential buildings is needed. |