Referring the illustrated psychrometric chart, suppose during the heating season where steam is injected into the air stream, this results in sensible heat gain and humidification. What statement represents the direction of the air conditioning process line? GS-RA-22 Illustration GS-RA-22: the U.S. Coast Guard has not released this illustration.

Correct Answer: Option D — The air conditioning process line is diagonal with the coil outlet to the right and above the coil inlet.

Steam injection adds both sensible heat and moisture to the air stream. On the psychrometric chart, this process moves the air state upward (increasing humidity) and to the right (increasing dry-bulb temperature). The resulting vector is a diagonal line representing the combined increase in enthalpy and moisture content.