空调风系统管网风量平衡仿真调试(一)：局部构件相邻连接影响修正
Simulation-based method for HVAC air-side system balancing (1): Correction for close-coupled
摘要：
针对传统风系统测试、调节与平衡(TAB)方法因流程烦琐而完成质量较差的问题，提出：事先对空调风系统建模，在仿真平台上进行风量平衡，并用仿真调平的结果指导之后的现场调试，从而加快现场调适进程，提高完成质量。针对现有风系统管网阻力构件模型往往不考虑相邻连接影响而导致的局部阻力系数误差较大的问题，主要借助CFD数值模拟，着重研究了三通、风阀和弯管3种局部阻力构件在5种常见两两串联关系下的局部阻力系数变化，并建立了构件相邻连接影响修正模型。修正前后的对比结果显示，所提出的修正方法可以很好地反映相邻连接对局部阻力系数的显著影响。
Abstract：
Due to the tedious measurements and unsatisfactory quality of the conventional testing, adjusting and balancing (TAB) process for HVAC air-side systems, presents performing the balancing procedure on the system models prior to the on-site TAB, so that the on-site work could be guided and improved. First, mainly focuses on the resistance models of the duct fittings. Most of the existing models do not account for the close-coupled effect when the fittings are closely connected. Adopts CFD simulation method to calculate the coefficient of local resistance of junctions, dampers and bends under five different connection arrangements. Proposes a new correction method for the close-coupled effect. Regresses the correction models based on the CFD results. The results show that the models could compensate the significant influences of the close-coupled effect on the fittings’ coefficient of local resistance.
Keywords:coefficient of local resistance, air-side system, duct network balancing, network fitting resistance model, close-coupled effect, commissioning