Mira had never seen a cooling tower up close until her first day at ClearStream Energy, the modest power plant that kept her coastal town humming. From the highway, the towers looked serene—oval shadows against the sky—but when she stepped into the plant yard, their scale and sound were different: a low, constant wind that smelled faintly of mineral and wet concrete.
If your approach is increasing year over year, your fill is fouled or your airflow is reduced. If your range is decreasing, your flow rate is too high or the load is reduced.