【作者】 董雷；

【导师】 李晓冬；

【作者基本信息】 哈尔滨工业大学 ， 供热、供燃气、通风及空调工程， 2006， 硕士

【摘要】 自从20世纪70年代能源危机以来,人们就在不断的寻求各种节能措施。对于暖通空调( Heating, Ventilating and Air Conditioning)系统来说,它的能耗占建筑总能耗的30%~40%,因此做好HVAC系统的节能工作是很关键的。那么,什么样的通风方式不仅节能而且能满足人们对室内空气品质和热舒适性的要求呢?为了解决这一矛盾,置换通风系统作为解决手段之一被越来越广泛的应用于公共建筑和民用建筑,因为它不仅能提供更好的空气品质,同时也是一种节能的通风方式。但是由于置换通风要求送风速度小,气流无法到达较远的地方,因此跨度比较大的一些建筑就不能采用置换通风系统,在这种情况下人们提出了碰撞射流通风方式,它具有可以应用在跨度比较大的建筑上的优点,因此碰撞射流通风方式现在已经广泛应用于欧洲一些国家的各类建筑。由于T.Karimipanah和H.B.Awb通过实验发现,采用碰撞射流通风时,喷口的安装高度在0.3m与1.5m之间,送风速度在1.4m/s与3.0m/s之间时,室内的气流组织比较好,因此,本文采用商业软件Airpak模拟办公室采用碰撞射流通风,喷口的安装高度为0.3m、0.9m和1.5m时,不同送风速度下室内速度场。通过模拟发现,喷口在不同的高度时,最佳的送风速度都为1.4m/s。通过模拟还发现,喷口的安装高度为0.3m,不仅能满足人们的舒适性要求,而且送风的卷吸作用对工作区的影响比较小。通过模拟在相同的情况下分别采用碰撞射流通风和置换通风的温度场、速度场、PMV和PPD,发现碰撞射流通风具有置换通风的一些优点,例如:室内气流组织比较好、工作区空气龄小、通风效率高、节能等。同时碰撞射流通风克服了置换通风冬天不能供热的缺点。因此,在进行碰撞射流通风系统设计时,在确定了喷口负责的区域后需要确定喷口最优的安装高度和出口风速,以便在保证工作区空气品质的前提下,尽量提高工作区舒适性指标。更多还原

【Abstract】 Since the energy crisis in 70s of last century, people have been searching for a variety of measures to save energy. In HVAC, its energy consumption maybe is 30~40 percent of the total energy consumption, so it is critical to take proper actions in HVAC system. Which kind of ventilation system can save energy and satisfy people to the indoor air quality and hot comfort at the same time? To solve this problem, Displacement ventilation system as a method has been widely used in public buildings and office buildings because it not only can provide better indoor air quality, but also is a saving energy ventilation system. Because the velocity of displacement ventilation is small and the flow air can’t arrive at the farther place, some buildings of bigger across degree can’t adopt the displacement ventilation system. In that case, the impinging jet ventilation is put forward. Because the advantages of being adopted in the building of bigger across degree, the impinging jet ventilation has been widely used in kinds of buildings in European nation.Because T.Karimipanah and H.B.Awb find through the experiment , adopting the impinging jet ventilation , while the installation height of the spout is between 0.3m and 1.5m, the velocity is between 1.4m/s and 3.0m/s, the indoor air current is better , so this paper uses commercial CFD software Airpak to simulate the velocity field by the impinging jet ventilation under the conditions of different wind velocity sent by spray and the different height of spout in office building. According to the result, the best wind velocity under different height of spout is 1.4m/s. According to the result, when the spout is in the height of 0.3 meter, it can satisfy people’s comfort request and the smaller work area of people feeling uncomfortable.Temperature fields, velocity distribution ,PMV and PPD are respectively simulated by the two kinds ventilation under the other same circumstance. According to the result, we discover that the impinging ventilation has some advantages same with displacement ventilation. For example, the better type of flow air, higher ventilation efficiency, smaller air age in work area and saving energy. The impinging ventilation overcomes the displacement ventilation更多还原