What happens to the dewpoint temperature when dilution air is introduced?

Introducing dilution air into a system typically lowers the dewpoint temperature. Dewpoint temperature is the temperature at which air becomes saturated with moisture and condensation begins to form. When dilution air, which is usually drier ambient air, is mixed into the existing air stream, it reduces the overall humidity of the system.

By decreasing the moisture content in the air mixture, the air can hold less water vapor, which results in a lower dewpoint temperature. This is particularly important in heating systems because controlling humidity and moisture is crucial for maintaining efficiency, comfort, and preventing the growth of mold or other moisture-related issues. Consequently, the introduction of dilution air effectively decreases the dewpoint, leading to a drier environment and better control over the heating process.