Joe,

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,=20
but it doesn't look like 1,000m^2, but looks could be deceptive.  Sadly, Go=
ogle decided not to send their camera car down that way, or even past the e=
nd of Charles=20
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 t=
o 1kW per square metre on a good day, but even allowing for the angle, refl=
ection and=20
other losses you may find that tin roof is being hit with up to half a mega=
watt.  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.  Other=
wise trying to heat=20
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 elect=
ricity supply... speaking of which, why not put solar panels on the roof?  =
Removes (some=20
of) the heating of the roof in Summer, and provides electricity to help pow=
er 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 somethin=
g) to keep that=20
cold air from the body of the bulding would be a Good Thing.

Cheers,


Howard Winter
St.Albans, England


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