What could indicate a problem if the only change on a CRO Screen is an increase in room temperature?

An increase in room temperature on a CRO (Continuous Refrigeration Operations) screen can indicate that the cooling system is not functioning properly. In this context, the presence of oil in the evaporator is specifically significant because oil can obstruct the efficient heat exchange process within the evaporator coils. When oil coats the coil surfaces, it reduces the area available for heat transfer, leading to less effective cooling and ultimately an increase in room temperature.

In refrigeration systems, proper heat exchange is crucial for maintaining the desired temperature. If the evaporator is compromised by the presence of oil, the refrigerant won't be able to absorb heat effectively, causing the temperature in the space to rise. Recognizing oil fouling in the evaporator as a potential problem helps operators focus on addressing issues related to system performance and maintaining operational efficiency.