air con investigation
air con investigation
(OP)
I need too investigate an exist ducted air con system that is not conforming (cooling capacity insufecient)
the duct system is served by means of a chilled water AHU.
Any tips on where to start my investigation?
the duct system is served by means of a chilled water AHU.
Any tips on where to start my investigation?





RE: air con investigation
RE: air con investigation
Re-commission the building envelope first, including blower door testing, THEN re-commission the HVAC and controls.
I can remember back 30 years ago when I got my first "too cold in the front office" complaint, and of course it was the heating engineer that was assumed to be at fault. I popped some ceiling tiles along the front outside wall and saw snow blowing in through cracks at unsealed building envelope construction at the soffit to wall interface. Pictures taken, report written, back up to the General Contractor and Architect to deal with. This has happened more often than not over the years when I get the too hot/too cold calls.
RE: air con investigation
A VERY typical situation is that the system was designed for a lower load than currently exists, more people, or more equipment, etc.
TTFN
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RE: air con investigation
RE: air con investigation
A design check is meaningful only after this investigation.
RE: air con investigation
RE: air con investigation
my concerns is:
-high delta T (10C) over coil
-low fan delivery of supply air fans (rated for 150pa, actual is expected to be much higher, RA fan is expected to be stronger)
what is your comments?
RE: air con investigation
Speculation is that there could be a geothermal well running below the room
How do I determine the heatload thereof?