某项目下沉式布置冷却塔通风散热CFD模拟及优化

CFD simulation and optimization of ventilation and heat dissipation for cooling towers in underground space of a project

对某已建工程下沉空间冷却塔现有布置方案和采取优化措施后的通风散热进行了CFD模拟。结果表明:现有布置方案结构梁、钢梁、篦子的遮挡对冷却塔通风的影响比较大,冷却塔的返混率为41.45%,远大于正常运行时10.00%返混率的要求;采取拆除钢梁、篦子和加装导风筒、异型导风筒的组合优化措施后,下沉空间设备返混率接近于零,实测冷却塔平均返混率为3.83%,较好地验证了CFD模拟结果。优化改造后的下沉空间设备运行良好,达到了预期的工程效果。

In this paper,the ventilation and heat dissipation for cooling towers of the existing layout scheme and after taking optimization measures in underground space of a built project are simulated using CFD.The results show that the occlusion of structural beams,steel beams and grates in the existing layout scheme has a great impact on the ventilation of the cooling towers.The return mixing rate of the cooling towers is 41.45%,which is much higher than the requirement of 10.00%return mixing rate in normal operation.After taking the combined optimization measures of removing the steel beams and grates,and installing air deflectors and special-shaped air deflectors,the return mixing rate of underground space equipment is close to zero.The measured average return mixing rate of the cooling towers is 3.83%,which well verifies the CFD simulation.After optimization,the underground space equipment operates well and achieves the expected engineering requirements.