置换通风加薄膜冷却吊顶系统的热舒适性研究

Thermal Comfort Research in Displacement Ventilation/Cooling Ceiling System Plus a Film

为了避免结露和下降气流,在置换通风/冷却吊顶系统的冷却吊顶下方加装对长波具有高透过率的薄膜密封包裹,该薄膜和冷却吊顶下表面之间保留一真空夹层。并采用计算流体力学(CFD)方法,模拟了同一办公室内置换通风/冷却吊顶系统(DV/CC)以及置换通风加薄膜冷却吊顶系统(DV/CCF)两个模型中的温度场、速度场和PMV指标的分布情况。通过比较模拟结果,分析改进后的流场特性,结果表明:薄膜的温度近似等于冷却吊顶下表面周围空气的温度值,薄膜表面和冷却吊顶不可能结露,下降气流也相应减少。

In order to avoid condensation and downdraft, cover the cooling ceiling with the diathermanous film having high penetration rate for long wave radiation, and there being a layer of vacuum between the ceiling undersurface and the film in the displacement ventilation/cooling ceiling system. And both the displacement ventilation/cooling ceiling system （DV/CC） and the displacement ventilation/cooling ceiling system plus a film （DV/CCF）, using the computational fluid dynamics （CFD） method to simulate the velocity field, the temperature field and PMV distribution situation of an office. By comparing the simulation results, the characteristics of flow field improved are analyzed, the result shows that the temperature of the film is almost equal to the temperature of indoor air around to the cooling ceiling undersurface, and dew condensation will not happen on the surface of the film and the cooling ceiling, meanwhile, downdraft may also be reduced.