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

The answer is A because, if air got wet then convert into the liquid and air become dry. Example like Winter.

The relative humidity is the amount of water vapor the air is holding right now as a percentage of what it would be holding if it were saturated. If relative humidity is 20 percent, for example, the air contains 20 percent of the water vapor that it could potentially hold at that temperature. If you increase the temperature, however, the amount of water vapor the air can hold increases, so the relative humidity decreases.

What is the relative humidity if air is 100% saturated? If the answer is 1 relative humidity should increase as it gets wet, right?

If we check the psychrometric chart, it should actually increase.

Relative humidity signifies the absorption capacity of air, if initial relative humidity of air is less it will absorb more moisture.

The relative humidity is the difference between dry-bulb temperature and wet bulb temperature.

- If dry bulb temp. Increase then RH will increase.
- If wet bulb temp. Increase then RH will decrease.

R.H increases as the air get wet.

In the psychometric chart if you draw a vertical upward line which indicates the humidification process (add of water vapour) and see there would be an increase in Relative humidity.