Practice

An office AHU cooling a perimeter zone at a sea-level site must offset a total room cooling load of $75{,}000\,\text{Btu/h}$ with a sensible heat ratio of $0.80$. The room is held at $75\,°\text{F}$, and the supply air enters the room at $55\,°\text{F}$ (see the AHU schematic). The required supply-air flow (cfm) is most nearly:

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