摘要
In order to increase cooling or heating efficiency,a porous computational fluid dynamics（CFD）model is employed to predict the thermo-fluid status and optimize the placement of outdoor units.A full scale model is established to validate the accuracy of CFD simulation in terms of velocity and temperature distributions.The comparison between the measurement and the simulation shows a good agreement.By evaluating the condensers＇ sucked air temperature with CFD for three units installed in a row,it is found that the minimum separation distance among neighboring units is 0.2 m;a vertical wall should be apart from the unit line by at least 0.8 m;and large different operating pressures among units do not impact the flow rate and the heat transfer of the other units meaningfully.
为了达到高效的制冷与制热效果,通过建立以多孔介质渗流力学为基础的计算流体动力学模型(CFD)来研究室外机与环境空气的换热过程,以获得室外机的合理布置方式;同时在实验室建立等尺度的室外机物理模型进行测试,获得了比较吻合的速度和温度分布结果,验证了CFD模拟方法的准确性.然后应用数值模拟方法分析不同布置方案下室外机的进风温度,优化了实际工程中3台室外机成直线布置时的合理间距:相邻2台机组之间的最小距离须大于0.2m,机组主要进风侧面与其周围高于机组的竖直墙面的极限间距为0.8m;风机动力相差较大的室外机相邻布置时,其中风机压差较大的室外机不会影响其他机组的进风量和换热量.
