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Duck House Orientation
Domestic duck houses are generally accustomed to north-south layout, but the main wind direction varies from place to place. Summer ventilation is an important issue for windowed duck houses or open duck houses that use natural ventilation. From the perspective of single-story duck houses, the long axis of the duck house is perpendicular to the main wind direction in summer, and good ventilation can be obtained on the midsummer day. It is beneficial to repel the heat in duck houses and improve the body temperature of ducks. However, duck houses are often not single-rowed. According to the experimental data of the building ventilation, when the wind is blowing against the front building (incidence angle 0), the airflow curve is blocked by the building and rises. After crossing the barrier, the natural airflow state is recovered. The distance is generally greater than the height of the house. 4 to 5 times. According to this requirement, when the height of the house is 3 meters, the spacing should not be less than 15 meters; if the height of the house is 5 meters (the sorghum duck house), the spacing should be at least 20 meters. This is a relatively large distance, uneconomical for land use, and often difficult to meet. When the building and the wind direction are at different angles, the size and shape of the leeward surface have a significant change. Therefore, in the arrangement of the groups, the duck house is oriented at an angle of incidence of 30 to 60 degrees with the summer main wind direction, which is advantageous for the natural ventilation of the group duck house, and the space can be reduced and the land can be saved. From this it can be seen that the direction of the duck house should be based on different regions and consider the local wind direction. According to reports, the east-west single-storey duck houses have lower summer temperatures than the north-south ones (2 to 3°C), but because they are single-family buildings, they are not enough to illustrate the problem. The analysis of east-west to duck houses has advantages: the long axis of the duck house is parallel to the main wind direction in the summer, and the middle walkway follows the wind direction, which can form a good wind tunnel, which can make the ducks on all levels cages evenly affected by the wind; due to the good ventilation, favorable Cooling, so that the environment within the home is better; and east-west to the duck house can make the wind angle of incidence close to 90, the ventilation of the duck house can not be affected by the spacing, which can greatly reduce the spacing size, saving land. Grouping crosswise arrangement of east-west duck houses will ensure better ventilation in each duck house. Of course, there are many problems to the duck houses, such as whether the summer sun can be solved by greening, and the length of the well-ventilated apron, the specific length of construction, and the specific construction practices need to be further studied. Some closed duck houses in Western Europe and other countries adopt the East-West layout in order to avoid cold winds in the north and reduce the loss of heat in duck houses. Therefore, there should not be a certain concept of orientation. It is necessary to make full use of the favorable conditions of nature and to prevent those unfavorable factors, so as to obtain the most favorable environmental factors and the effect of land-saving in overall layout.