If a walk-in cooler requires a high percentage of moisture in the air, what should be the logical evaporator TD?

In refrigeration systems, particularly for applications like walk-in coolers where maintaining a specific humidity level is crucial, the evaporator temperature difference (TD) is a critical factor. A low evaporator TD of 10°F is appropriate for a walk-in cooler that requires a high percentage of moisture in the air.

This lower TD helps maintain a balance between cooling and humidity control. When the evaporator TD is kept at 10°F, it allows the evaporator coil to efficiently cool the air while still condensing moisture effectively. This is because a lower temperature difference enables the air to stay in contact with the evaporator coil longer, which enhances the coil's ability to absorb moisture from the air.

Higher TD values, such as 20°F, 30°F, or 40°F, would lead to less efficient moisture removal. These higher evaporator TDs could cause the humidity levels to rise uncontrollably within the cooler, potentially leading to condensation issues and compromising food safety by promoting spoilage.

Thus, when high humidity levels are necessary in the environment of a walk-in cooler, sticking to a lower evaporator TD of 10°F is the most logical and efficient choice.