🔍 Key Concepts

• Cooling coil efficiency and how it relates to the air reaching its desired leaving temperature • Bypass factor as the fraction of air that passes through the coil without being fully cooled to coil surface temperature • Effect of coil surface area and fin condition on heat transfer and air contact

💭 Think About

• Ask yourself which option would most reduce the effective heat-transfer surface area or the quality of contact between air and coil surfaces. • Consider which options would tend to improve coil performance versus those that would clearly degrade it. • Think about whether changes in ambient pressure/temperature change the coil’s physical ability to cool air, or mainly the load on the system.

✅ Before You Answer

• Identify which choice would permanently remove or reduce fin/coil surface area or its ability to disturb airflow. • Decide which actions typically restore coil performance (cleaning, maintenance) rather than harm it. • Check which factors actually change the geometry and surface condition of the coil, since those directly affect bypass factor.