Technical feasibility analysis of a hybrid solar-wind energy system and rainwater harvesting for green building planning of a four-story lecture hall building in Padang Pariaman, West Sumatra
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This study presents a technical assessment of green building planning for a four-story lecture hall building with a floor area of 3,880 m², integrating a 177.6 kWp rooftop solar photovoltaic (PV) system, vertical-axis wind turbines (8 × 10 kW), a battery energy storage system, and a sensor-based automatic rainwater harvesting system. Energy and water demand calculations adopted standard green building planning methods, while renewable energy potential was estimated using actual climate data from the Indonesian Agency for Meteorology, Climatology, and Geophysics (BMKG) for 2021–2025, covering rainfall and wind speed in the Padang Pariaman region, West Sumatra. The results show that energy efficiency measures combined with solar PV reduced grid electricity consumption by 58.7% and carbon emissions by approximately 387 tons CO₂ per year. Analysis of actual wind speed data revealed that the site's wind speed is far below the cut-in speed of commercial wind turbines, resulting in a near-zero capacity factor and rendering wind turbine installation technically unfeasible at this location. The rainwater harvesting system, supported by high local rainfall, can meet more than half of the building's clean water demand. This study underscores the importance of validating renewable energy assumptions with actual climate data before making investment decisions in green building planning.
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Referensi
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