低温送风温湿度控制数值仿真研究

低温送风是一种新型的送风方式,其送风温度较低,因而具有比常规送风更强的除湿能力。以办公室作为研究对象,建立三维数值模型,对房间内的温湿度分布和空气流动进行数值仿真计算,比较常规送风和低温送风条件下办公室内温湿度的差异。对比数值计算结果,发现两种送风方式在相同制冷量下,房间的温度分布差异不大,但低温送风具有更强的除湿能力,其相对湿度要比常规送风低10%左右,人员的热舒适性更好。此外,从制冷机组出来的冷风和回风按一定比例回合之后,混合风的温度上升,相对湿度下降,可以有效避免送风口附近区域的凝露现象。

Numerical study on influence of cold air distribution on temperature and humidity

Cold air distribution is a novel concept, which has stronger dehumidifying capability than conventional air distribution due to its low supply air temperature. An office room with staffs was numerical studied on the basis of a 3-dimensional model. Using k-ε turbulence model and species transport model, the temperature filed, relative humidity filed and streamline field of the office room were all obtained. Comparing the numerical results of cold air supply system and conventional system with the same cooling capacity, it can be found that the average temperatures of two systems are similar. However, the relative humidity of cold air distribution system is 10 percent lower than that of conventional system, thus a better thermal comfort is obtained. Moreover, the condensation can be avoided by mixing the cold air from refrigerating unit and the return air from office, which results from the high temperature and less relative humidity of the mixing air.