Air-conditioning process metric: The sensible heat factor (SHF) for an air-conditioning process is defined as (use S.H. = sensible heat and L.H. = latent heat over the process):

Introduction / Context:
The sensible heat factor (SHF) quantifies the proportion of sensible heat change in the total heat exchange of an HVAC process. It helps classify processes (pure sensible, cooling and dehumidification, humidification with heating, etc.).

Given Data / Assumptions:

• S.H. is net sensible heat added or removed.
• L.H. is net latent heat added or removed (due to moisture change).
• Total heat = S.H. + L.H.

Concept / Approach:
By definition, SHF = S.H. / (S.H. + L.H.). A purely sensible process has L.H. = 0 and SHF = 1; pure latent process has S.H. = 0 and SHF = 0.

Step-by-Step Solution:

Verification / Alternative check:
On the psychrometric chart, lines of constant SHF have characteristic slopes tied to the apparatus dew-point method.

Why Other Options Are Wrong:
Other ratios invert or subtract the correct relationship and do not yield normalized values between 0 and 1 for general processes.

Common Pitfalls:
Confusing SHF with room sensible heat factor (RSHF) or grand sensible heat factor (GSHF); those include additional loads but keep the same ratio idea.

Final Answer:
S.H. / (S.H. + L.H.)