格栅孔隙率对某空调室外机性能影响的CFD研究

CFD simulation of the grille porosity effect on the outdoor unit performance

为了满足建筑物外观的要求,通常采用格栅将空调室外机的安装阳台密封起来。然而,格栅孔隙率的大小将直接影响机组的通风与换热性能。本文运用数值模拟的方法对某室外机周围的流场进行计算,研究格栅孔隙率对机组性能的影响。计算结果表明,增大格栅的孔隙率将会增加阳台的通流能力,有效降低盘管的进风温度。在实例中,当格栅孔隙率从0.25增加到0.64时,通过格栅的流量百分比将从35.2%增大到108.4%;为了满足该机组正常运行的要求,格栅的孔隙率应该大于0.6。

In view of the appearance requirements, the terrace outer surface is always closed by the grille. While, the grille porosity will affect the outdoor unit ventilation and heat transfer performance. Uses the CFD method to study the grille porosity effect on the outdoor unit. The simulation results show that increasing the porosity can increase the air discharged performance and reduce the coil inlet temperature. For the studied case, when the grille density is increased from 0.25 to 0.64, the discharged air flow percent will be changed from 35.2% to 108.4%. The designed grille porosity should be larger than 0.6 to ensure the outdoor unit running safely ＆economically.