Which statement about coil surfaces is incorrect?

Fins on coils serve to enhance their performance by increasing the surface area for heat transfer while maintaining a compact design. The purpose of fins is to facilitate better heat exchange between the refrigerant within the coils and the air passing over them.

The statement regarding fins needing to be flat and smooth for airflow lacks accuracy because fins can come in various designs, including those that are not perfectly flat or smooth. In fact, the specific geometry of fins can be designed to optimize airflow and heat transfer. Fins can have serrated or louvered designs that improve airflow characteristics and heat transfer efficiency, rather than simply being flat and smooth. Therefore, this statement does not reflect the versatility and functional design aspects of coil fins in practical refrigeration applications.