| Guangzhou has a humid subtropical climate influenced by the Asian monsoon with high temperatures and high humidity whole year around. Therefore, building structures are more emphasized on natural ventilation. The southeast monsoon in summers together with the wind produced as a result of surface topography brings fresh air to the city and it also improves wind circulation. However, there are still 30% of chances when there is no wind. Hence, natural ventilation in Guangzhou consists of pressure ventilation and hot air ventilation. Effective patio design helps residential buildings to maintain efficient natural ventilation.During the modern stage of development, Guangzhou emerged a large number of outstanding residential buildings, which contribute a lot in the fields of history, art, science. Most of these buildings are high-density low-rise residential, which are equipped with patios as an important means of air circulation. Patios not only solves the design problems, such as light concentration and ventilation, which are caused by high-density residential, but also enriches peoples' lives.To further understand Guangzhou's modern residential patio design, writer selected four representative modern residential to analyze their actual ventilation efficiency or use CFD (Computational Fluid Dynamics) software AIRPAK to operate the simulation, namely:1. the former residence of Huoyou Zhang on Baohua Road,2. No.39 and No.41 buildings on Shamian North Street,3. the parallel residential on Hui Xin East Street,4. No.16 bamboo houses on Henning Road. After analysis, there are ten pieces of notes about patio ventilation design:1, The patio should be arranged in the main air paths, and indoor air paths should be as simple as possible;2, Using component to guided wind into rooms, to strengthen the pressure of the wind.can ride the building, the outdoor air into the courtyard, strengthening wind drafts;3, It should be ensure that the size of the windows are large enough to let wind in, and to maintain the smooth flow of indoor air paths; 4, The size of the windows should be as large as possible;5, The patio should be the cold source of the construction, it must be better to have some plant and water to strengthen the effect of cold;6, It can be design an additional heat storage coefficient on the top of the patio, to make the temperature difference increased;7, It is better to set the staircase besides the patio to have more cooling source;8, Height to width of the patio should be better set to 3:1-5:1, and it is beneficial to make the hot air pressure and wind pressure;9, The effective ventilation of patio for two to three floors when the story is 3m to 4m high, three above the overall decline in ventilation;10, Different sizes of patio can produce different temperature to produce the hot air pressure in patio, but the space can't too big or too small.Surrounding towns and villages, we found that in high-density low-rise residential, patio is still worth putting into use. According to the above summarized notes, the author designed a three-floor parallel residential in a rural housing design competition sponsored by Guangdong Provincial Construction Department. The design was under AIRPAK simulation test and it showed that the patio did well in the residential ventilation. |
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