What effect does increased humidity in a store have on the operation of refrigerated cases?

Increased humidity in a store can lead to reduced coil efficiency in refrigerated cases. This occurs because when the air is more humid, the moisture condenses on the evaporator coils within the refrigeration system. This layer of condensation acts as an insulating barrier, which can hinder the ability of the coils to effectively transfer heat. As a result, the coils may need to work harder to maintain the desired temperature, which can lead to reduced efficiency and increased energy consumption.

In contrast, other options such as increased cooling speed, enhanced food preservation, or reduced operating cost are not typically outcomes associated with increased humidity in refrigerated cases. Increased humidity does not facilitate faster cooling; rather, it complicates the cooling process. While humidity can play a role in food preservation, excessive humidity can promote spoilage or mold growth. Lastly, higher humidity generally leads to increased operational costs due to the need for more energy to maintain optimal refrigeration conditions. Hence, the impact of humidity is primarily seen in decreased coil efficiency.