Re: [OT] Air-con advice wanted
Howard Winter <HDRW@...
2012-02-01 13:58:16 GMT
I'm assuming you're talking about the building at the corner of Charles St. and Akepiro St. on the West side
of the latter? It seems to have 4 long, narrow rooflights,
but it doesn't look like 1,000m^2, but looks could be deceptive. Sadly, Google decided not to send their
camera car down that way, or even past the end of Charles
St. so we can't see the building other than from overhead.
Well Job 1 is to get that roof insulated! Solar energy can contribute up to 1kW per square metre on a good day,
but even allowing for the angle, reflection and
other losses you may find that tin roof is being hit with up to half a megawatt. It makes no sense to let that
heat in and then pay good money to get it out again.
If he doesn't need 5m of height, a false ceiling will help too, as it will tend to keep the warm air above it in
Summer and below it in Winter. Otherwise trying to heat
the air in Winter will result in a nice warm ceiling and cold people!
Trying to solve it with AirCon alone is not on unless you have a free electricity supply... speaking of
which, why not put solar panels on the roof? Removes (some
of) the heating of the roof in Summer, and provides electricity to help power the AirCon - Win/Win!
Oh, and that roller-shutter is likely to be drafty in Winter, even when it's closed, so building something
inside (an enclosed loading bay or something) to keep that
cold air from the body of the bulding would be a Good Thing.