Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning - Discussion

The correct answer is: cooled and humidified.

Here's what happens in a spray washing system when the water temperature is higher than the dry bulb temperature of the entering air:

1. The air comes into contact with the water droplets, causing the air to cool down to the wet bulb temperature (WBT).
2. As the air cools, its capacity to hold moisture decreases and the excess moisture condenses onto the water droplets, increasing the humidity of the air.
3. Since the water temperature is higher than the air temperature, the air is cooled, and its humidity increases.

So, the correct sequence is;
- Air is cooled (from DBT to WBT)
- Air is humidified (as excess moisture condenses onto water droplets)

The other options are not accurate:

- Heated and dehumidified: This would occur if the air temperature were higher than the water temperature.
- Heated and humidified: This would occur if the air were heated by a heat source, not by contact with water.

The temperature Of spray water is higher than that of entering air so the moisture particle gets evaporated and absorbed by the entering air. Due to it the air gets HEATED and because of moisture content added in the air. So air is HUMIDIFIED.