The impact of natural ventilation on energy consumption in detached houses based on different climate zones in Japan

学生名：REN YUFAN

研究テーマ：The impact of natural ventilation on energy consumption in detached houses based on different climate zones in Japan

入学年月:2021.10

修了年月:2023.09

取得学位：修士（工学）

論文概要:This paper, The Impact of Natural Ventilation on Energy Consumption in Detached Houses Based on Different Climate Zones in Japan, explores the influence of natural ventilation on energy use in detached residential buildings across Japan's diverse climate zones.

The study first analyzes regional climate characteristics to determine the potential and key factors influencing natural ventilation across different zones. It reveals significant regional differences in the annual effectiveness of natural ventilation, primarily driven by climate conditions. In northern regions like District 1 (e.g., OMU), the perennial cold climate limits natural ventilation. In contrast, Districts 2–7 have higher annual effective rates of natural ventilation, ranging from 20% to 30%. Southern areas, such as Naha City in District 8, show the highest efficiency, with an annual effectiveness of 44.5%.

Using BEST software simulations, the study evaluates the impact of natural ventilation on indoor temperature and energy consumption, identifying energy-saving potentials between 10% and 40% across climate zones. Energy savings increase progressively from north to south, with cooling energy consumption in District 1 reduced by nearly half, demonstrating significant efficiency. District 8 offers the greatest energy-saving potential, achieving savings about five times higher than District 1.

These findings offer valuable insights for optimizing natural ventilation in detached houses and inform sustainable design strategies tailored to Japan’s varied climate zones.