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:In this paper,The impact of natural ventilation on energy consumption in detached houses based on different climate zones in Japan investigates the impact of natural ventilation and building energy consumption in detached residential buildings across diverse climate zones in Japan.

First, this paper analyzes the regional climate characteristics of different climate zones in Japan and obtains the potential of natural ventilation in different climate zones in Japan and the main factors of natural ventilation effects in different regions. The results show that there are significant differences in the annual effective ratio of natural ventilation in representative cities in different climate zones in Japan, and this difference is affected by climate conditions and gradually increases from north to south. Cities in District 1 represented by OMU have limited availability of natural ventilation due to the perennial cold climate. Secondly, the annual effective rate of natural ventilation in the representative cities of Districts 2, 3, 4, and 5 is relatively high, about 20%. The annual efficiency of natural ventilation in the representative cities of districts 6 and 7 is slightly higher, about 30%, and has a relatively large potential for natural ventilation. Finally, Naha City, which represents the 8th ward, had the highest natural ventilation annual efficiency at 44.5%.

Based on the analysis, this paper uses BEST software to simulate indoor temperature and refrigeration energy consumption, studying the impact of natural ventilation on indoor conditions and proposing schemes for different climate zones. Through the study of residential buildings in different climate zones in Japan, it is found that the energy-saving potential is generally between 10% and 40%. As the climate gradually changes from north to south, the energy savings achieved through natural ventilation increase gradually. In terms of energy-saving efficiency, natural ventilation in the first climate zone can reduce cooling energy consumption by nearly half, and the energy-saving effect is remarkable. On the other hand, from the perspective of energy saving, the eighth climate zone has the greatest potential, and its energy saving is about five times that of the first climate zone.

The above research results can provide a reference for the planning and design of Japanese detached houses for the use of natural ventilation and the application of natural ventilation in different climate zones.