FAHU Design

A: The 35C ambient is the breakpoint. At that condition, latent capacity margin is thin, so increasing coil control authority is the move that actually restores sensible capacity without pushing the coil into a wetter operating line that spikes RH.

A: The upstream location is the trigger. That geometry lets return air bypass the mixing section, so economiser logic can't maintain a stable mixed air condition no matter how good the controls are.

A: The 95 kW over 8.5 m3/s sets the answer. Using 1.2 kg/m3 and 1.02 kJ/kg·K lands you just under a 10.5 K drop, which puts leaving air near 19.5C.

A: The RH rise shows you're at the coil knee. A small SAT trim increases latent pickup without a big energy hit, whereas the other moves either add moisture or remove your only humidity control lever.