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Effects of Attic Air Ventilation, Insulation and Sunshading on Living Pleasantness

阁楼通风、保温、遮阳对居住舒适度的影响

基本信息

批准号：
01550461
负责人：
AKASAKA Hiroshi
金额：
$ 1.54万
依托单位：
Faculty of Engineering, Kagoshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550461/
关键词：
wooden house attic ventilation amount of air change heat exhausting effect k-epsilon model k-εモデル

项目摘要

Attic air temperature of wooden houses usually rises more than 50 ^ﾟC during daytime in the summer season, and this causes a temperature rise in the rooms underneath the attic space. The common countermeasure for this problem is ventilation of attic space. Especially, forced ventilation of attic space with fan is expected to be effective on heat exhaust and lowering the temperature of the space. So this effect was examined quantitatively by the field measurements of two individual wooden houses (One is 2 x 4, and the other was constructed by Japanese traditional method) in Kagoshima City from 1989 to 1990. Based upon the measurements of attic air temperature and amount of air change of attic space as well as air temperature of the ceiling underneath the attic space, the following results were obtained :1. Fan is effective when attic space is air tight and amount of natural air change is small. When the Amount of natural air change exceeds 4 (times/h), fan is no more effective on lowering attic temperature.2. Even if attic space is well ventilated, attic temperature is higher than outdoor temperature by 3 to 5 ^ﾟC. To lower attic temperature to outdoor temperature, roof insulation should be necessary. The thickness of the insulation should be decided taking into account intensity of solar radiation.In addition to the field measurements, K- epsilon turbulence model was introduced to analyze attic air distribution. Both isothermal and non-isothermal situations with forced ventilation were simulated. The influences of inlet and outlet locations and their sizes

木屋的阁楼空气温度通常在夏季白天上升超过50摄氏度，这会导致阁楼空间下面的房间温度上升。针对这个问题的常见对策是阁楼空间的通风。特别是，阁楼空间的强制通风与风扇预计将有效的排热和降低空间的温度。为此，我们于1989 ~ 1990年对鹿儿岛市两个木结构住宅（一个为2 × 4，另一个为日本传统方法建造）进行了实地测量，定量地检验了这种影响。通过对阁楼空气温度、阁楼空间换气量以及阁楼空间下顶棚空气温度的测量，得到以下结果：1。当阁楼空间是气密的，自然换气量很小时，风扇是有效的。当自然换气次数超过4次/h时，风机对降低阁楼温度不再有效.即使阁楼空间通风良好，阁楼温度也比室外温度高3至5 ^摄氏度。为了降低阁楼温度到室外温度，屋顶隔热是必要的。隔热层的厚度应根据太阳辐射强度来确定。在现场实测的基础上，引入K-ε湍流模型对阁楼气流组织进行了分析。模拟了强制通风的等温和非等温情况。进出口位置及其尺寸的影响