公路或铁路隧道的隧道通风设施面临设计要求的挑战。其中包括火灾热释放率（FHRR）。许多人认为FHRR越大，系统就越安全，但事实是，如果FHRR太大，通风系统控制烟雾所需的气流就变得太大，设施需要很大的空间，而且成本可能会上升到通风设备的可建造性成本可能太高而无法建造的地步。通过隧道通风设施的气流速度和风扇工作点是关键参数。通过隧道通风设施的气流是隧道配置约束的函数； 而工作点是风扇数量、单个风扇气流、机房布局和气流路径的函数。气流速率通过计算机建模确定，考虑了许多分支和隧道网络损失。工作点通常由手工计算确定（对于简单的系统），但有时，我们需要进行计算机建模变得非常困难。本文将说明FHRR的变化幅度与隧道通风设施的尺寸之间存在非线性相关性。最终会有变化，但需要通过计算机模拟来评估这些变化。 引文:内华达州拉斯维加斯ASHRAE会议论文

Tunnel ventilation facilities, for road or rail tunnels, face the challenge of the design requirements imposed on them. Among them is the Fire Heat Release Rate (FHRR). Many think that the larger the FHRR, the safer the system, but the fact is that if FHRR is too large, the airflows required for a ventilation system to control the smoke become too large, the facility requires a lot of space, and the cost may escalate to the point that the constructability of the ventilation plant may be too costly to build.The airflow rate through the tunnel ventilation facility and fan duty points are key parameters. The airflow through the tunnel ventilation facility is a function of the tunnel configuration constraints; while the duty point is a function of the number of fans, individual fan airflow, equipment room layout, and airflow path. The airflow rates are determined through computer modeling taking into account numerous branches and tunnel network losses. The duty point is usually determined by hand calculations (for simple systems), but sometimes, it becomes very difficult that we need to carry out computer modeling. This paper will illustrate that there is a non-linear correlation between the magnitude of change in the FHRR, and the sizing of the tunnel ventilation facility. Ultimately, there is a change, but through computer simulations, these changes will need to be assessed.