Psychrometrics concept check “The heating of air without any change in its specific humidity is called sensible heating.” State whether the statement is correct.

Introduction / Context:
Air-conditioning processes are classified by how temperature and moisture content change. Distinguishing sensible heating from humidification/dehumidification is foundational for coil selection and load calculations.

Given Data / Assumptions:

• Sensible heating: temperature increases while moisture content (specific humidity or humidity ratio) remains constant.
• No moisture is added or removed by the process equipment.

Concept / Approach:
On a psychrometric chart, sensible heating tracks horizontally to the right at essentially constant humidity ratio. Relative humidity decreases because warmer air can hold more moisture, but the absolute moisture content does not change.

Step-by-Step Solution:

Verification / Alternative check:
Compare with sensible cooling (horizontal left) and cooling & dehumidification (left and down across saturation curve). Only when crossing saturation or contacting condensate does w decrease.

Why Other Options Are Wrong:
“False” and conditional variants impose restrictions that are not part of the definition; sensible heating does not require saturation or special flow conditions.

Common Pitfalls:
Confusing relative humidity change (it does change) with specific humidity (it does not). Remember: “sensible” modifies temperature only.

Final Answer:

True