What would the Wet Bulb Temperature be at a Dry Bulb Temperature of 90°F with 30% Relative Humidity?

To determine the Wet Bulb Temperature given a Dry Bulb Temperature of 90°F and a Relative Humidity of 30%, various psychrometric principles and charts can be utilized.

The Wet Bulb Temperature (WBT) represents the lowest temperature that can be reached through the evaporation of water. At lower values of Relative Humidity, the difference between the Dry Bulb Temperature (DBT) and Wet Bulb Temperature is generally larger due to a greater capacity for evaporation.

In this scenario, with a DBT of 90°F and a Relative Humidity of 30%, the WBT will be lower than the DBT since not much moisture is available to increase the cooling effect from evaporation. Based on psychrometric charts and standard calculations, the Wet Bulb Temperature in this context is found to be approximately 67°F.

This value indicates a significant cooling effect from the evaporation processes, but it is still quite high compared to the lower end values typically seen at higher relative humidity levels. This understanding of how humidity interacts with temperature helps explain why the calculated Wet Bulb Temperature is approximately 67°F in this specific case.