In an economizer system, the enthalpy control measures which of the following?

In an economizer system, the enthalpy control primarily measures the total energy content of the air, which is influenced by both temperature and moisture content. However, the correct emphasis here is on humidity, as enthalpy is significantly affected by the moisture present in the air.

When the enthalpy control evaluates the ambient air, it assesses the moisture content in the air along with its temperature to determine the overall efficiency of the economizer. The idea is to utilize outside air when it has a lower enthalpy than the air being recirculated within the building, thus facilitating cooling and improving energy savings.

Therefore, when we focus on 'humidity of ambient air,' we are highlighting the crucial role that moisture plays in the overall enthalpy values, making this aspect of air measurement significant for economizer systems. This understanding helps technicians optimize the balance of indoor climate control and energy efficiency.