Question

Which one of the following psychrometric processes is represented by the line 1-2 in the figure? 

• A. Cooling and humidification
• B. Cooling and dehumidification
• C. Heating and humidification
• D. Heating and dehumidification

Hint:

To analyze psychrometric processes, observe the direction of the process line on the chart: Rightward movement indicates heating, while leftward movement indicates cooling. Upward movement indicates humidification, while downward movement indicates dehumidification.

Answer 1

The Correct Option is C

Step 1: Understand the psychrometric chart. 
The psychrometric chart plots specific humidity (vertical axis) against the dry bulb temperature (horizontal axis). Key observations: - Moving to the right along the dry bulb temperature axis indicates heating. - Moving up along the specific humidity axis indicates humidification (addition of moisture). 

Step 2: Analyze the line 1-2 in the figure. 
The process line 1-2 shows: 1. An increase in dry bulb temperature (movement to the right). 2. An increase in specific humidity (movement upward). This indicates that the air undergoes both heating and humidification. 

Step 3: Verify options. 
Option (A): Incorrect, as it involves cooling and an increase in humidity, which does not match the process.
Option (B): Incorrect, as it involves cooling and dehumidification, not heating and humidification.
Option (C): Correct, as it matches the observed process of heating and humidification.
Option (D): Incorrect, as it involves heating and dehumidification, not humidification.

Conclusion: The psychrometric process represented by the line 1-2 is \( \text{(C) Heating and humidification} \).