Originally Posted by
Makeit go Right
Don't give up! Two units with a combined sensible output of 7kW is too small for that room.
Look, just with a couple of guess loads:
a) 30 LCD computers at 180w =5.4kW {sensible}; and
b) 30 kids +teacher @75w =2.3kW {sensible}.
So, before you add on fabric, lights and fresh air/infiltration, your sensible load is already over 7kW(all year around). If it were me, I would go in there and trash the other quote, showing them up as someone who does not know what they are doing (even if it isn't completely true). The customer doesn't want to install something too small and then wind up with egg on his own face. I would urge you to chase after that order, mate.
ps: Actually, something looks a bit odd with that quoted Fujitsu sensible kW figure............that looks like a nominal sensible kW figure, not UK sensible. Worth checking that too. I will bet that the actual UKsensible cooling output will be only about 3.35kW. And x2= 6.7kW, which is looking a bit worse. The client needs your help before he messes up.