During sensible heating of air across steam coils in a grain dryer, which of the following psychrometric properties remains constant?
Options:
(A) Humidity ratio (specific humidity $\omega$) and dew point temperature
(B) Relative humidity
(C) Enthalpy
(D) Dry bulb temperature
Answer Key:
A
Step-by-Step Solution & Explanation
Sensible heating adds thermal energy without changing moisture mass, so humidity ratio $\omega$ and dew point stay constant, while dry bulb and enthalpy increase, and relative humidity decreases.