As systems are designed for colder applications, what change occurs to the spacing of the fins in an air evaporator?

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In colder applications, frost formation on the evaporator fins becomes a big concern because the surface is very cold and humidity can freeze on contact. Fin spacing affects how airflow moves through the fin pack and how easily frost blocks the passages. By spacing the fins further apart, you reduce the chances that frost will bridge between fins and restrict airflow, and you also lower the air-side pressure drop. This helps maintain adequate air flow and overall heat transfer performance without being overwhelmed by frost buildup. If fins were kept tightly spaced, frost could more quickly clog the passages and raise energy consumption or degrade performance. Removing fins altogether would drastically cut the heat transfer area and is not desirable. Therefore, spacing the fins further apart is the design choice for colder systems.