The Study Of Impinging Jet Ventilation Sysytem In Office Building

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...