Original message
| drover8
 |  "A/C Icing up solution"
, posted Wed 18 Aug 00:09  
I work for a company in Queensland, Australia (summer averages about 32-40ºC) We have had problems with remote, un-manned buildings A/C units (window mounted, 2kW) icing up. These buildings contain switchgear (dry heat load). I believe the problem lies in the lack of latent heat extraction in the system after a day or so of A/C running (as the buildings are sealed against wildlife/intruders) I can't seem to find a solution to the problem of keeping the equipment cool (around ~25ºC) without problems from the A/C units. I am NOT well versed in HVAC! Any suggestions?
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Replies:
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| Xenos
Webmaster 
|  "Re(1):A/C Icing up solution"
, posted Wed 18 Aug 15:50
I would think that it’s the air flow distribution that may be causing your problem. If there is any chance of the air recalculating back to the unit with a temperature lower than 18C it will happen. And in rooms like you mention I can see it happening.
Xenos.
The best way to escape a problem is to solve it.
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| | drover8
| "Re(2):A/C Icing up solution" , posted Wed 18 Aug 19:05
OK, if I understand right, you're saying that the temperature isn't uniform through the buildings, resulting in colder air being re-circulated through the A/C units? The buildings are 8, 10 and 14 metres long, 3.1 metres wide and 2.7 metres high, with insulated steel frame walls. There is also thermostats in the building that cycle the power on/off to the A/C units, these cut out@25ºC, but they are located in the centre of the building, so that would support you're lack of uniform temperature theory, to a certain extent. If this is so, would circulating the air with something like fans be a solution? The only problem there is that since the buildings are remote (in some cases 4hrs drive away from civilisation!), there is no telling if these fans have failed, as well as adding another point of failure in the system. These buildings have exhaust fans in them, in the centre of the building, so would turning these on intermittently possibly "patch" the problem?
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| | Xenos
Webmaster
| "Re(3):A/C Icing up solution" , posted Wed 18 Aug 19:15
I guess the first thing to do is prove this theory. If it is, I would look at a way of having the air distributed across the room.
P.S it must get quite hot at the other end, what is this rail way car or something?
Xenos.
The best way to escape a problem is to solve it.
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