In HVAC terminology, humidification refers to adding moisture to air. If moisture is added in a way that the dry-bulb temperature does not change, is it still called humidification?

Introduction / Context:
Humidification broadly means adding water vapour to an airstream. The dry-bulb temperature may rise, fall, or remain constant depending on how moisture is supplied (steam injection, adiabatic spray with water, or contact with wetted media). The definition focuses on moisture addition rather than a specific temperature change.

Given Data / Assumptions:

• The process described adds moisture to air.
• Dry-bulb temperature is stated to remain unchanged.
• No requirement that relative humidity or enthalpy follow a particular path.

Concept / Approach:
Humidification is defined by an increase in humidity ratio (kg of water vapour per kg of dry air). Temperature behavior depends on the method: steam addition can raise DBT; adiabatic evaporative humidification typically lowers DBT; and carefully controlled steam or heat exchange can keep DBT nearly constant. All are valid humidification processes since the core attribute is increased moisture content.

Step-by-Step Solution:

Verification / Alternative check:
On a psychrometric chart a constant-DBT humidification path moves vertically upward (w increases while DBT holds). This is physically feasible with appropriate control, e.g., steam at matched temperature or balanced heat exchange.

Why Other Options Are Wrong:

Disagree: incorrectly restricts humidification to temperature-changing paths.Conditions tied to “only if” are unnecessary; humidification is defined by added moisture, not by RH or wet-bulb behavior.

Common Pitfalls:
Assuming all humidification must be adiabatic (which typically decreases DBT). Steam humidification can increase or hold DBT depending on control.

Final Answer:

Agree