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Số người truy cập: 74,162,531

 Phân tích tiềm năng làm mát và sưởi ấm thụ động ở Việt Nam sử dụng phương pháp đồ họa và tập tin khí hậu TMY
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Tác giả hoặc Nhóm tác giả: Nguyễn Anh Tuấn, Reiter Sigrid
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Nơi đăng: CISBAT international conference, Lausanne, Switzerland 2011; Số: Conference proceedings (ISBN 978-2-8399-0906-8);Từ->đến trang: 323-328;Năm: 2011
Lĩnh vực: Khoa học công nghệ; Loại: Bài báo khoa học; Thể loại: Quốc tế
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This paper studies the potential to improve thermal comfort in Vietnam thanks to passive strategies. First, a thermal comfort zone for the Vietnamese is proposed by using the PMV-PPD heat balance model of Fanger and the effects of adaptive mechanism of the people living in tropical hot humid region. Then, the comfort zone is enlarged using the algorithms proposed by the authors to calculate the effects of the passive heating and cooling strategies. Typical Meteorological Year (TMY) weather data are used for graphically printing of hourly environmental parameters on the psychrometric chart and for climate analysis, subsequently. The limitation and the scope of this method are also specified. Results of this study show that in all climatic zones of Vietnam, natural ventilation is an efficient cooling solution, low-cost and easy to apply. Thermal comfort improvement of natural ventilation strategy varies with the climatic zones, increasing from 17.1% in Hanoi, 21% in Danang to 31.4% in Hochiminh city. Meanwhile, passive solar heating is not really effective since winter in Vietnam is usually not too cold and the capacity of the passive solar collector system is usually limited. Direct evaporative cooling also has a great cooling effect compared with that of natural ventilation, but significant humidity augmentation in the air in hot and humid conditions may be inappropriate. Seasonal analysis reveals that natural ventilation gives higher performance than other methods and is particularly effective in mild seasons. During 12 months in Hanoi, the analysis clearly shows significant contribution of natural ventilation in the period from April to October during which comfort period achieved might vary from 30% to 81%. The combination of all passive strategies considerably improves thermal comfort: 22.6%, 31.7% and 47.6% of total time in Hanoi, Danang and Hochiminh city, respectively. Finally, the findings of this study indicate that conventional heating and cooling methods are also needed during extreme weather conditions in summer and winter, especially in Hanoi.
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