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re: year-round cooling needed; unmanned equipment
21 dec 1996
francis fisher wrote:
>i'm an end-user who was just told that i need to change out an ac unit
>used in the following situation. i want to know what type of unit i
>should consider for longest life.
an exterior sunshade with a radiator underneath, with a modine fan coil unit
inside and a heater? call zomeworks at (800) 279-6342. ask about cool cells.
>we are cooling a 5000 watt broadcast transmitter in a 1000 cu ft
>insulated building on a year-round basis in west virginia.
a 10x10x10' building with 500 ft^2 of walls and ceiling?
>(outdoor temps never worse than -15 deg.)
so the heater needs to make about (32-(-15))x500ft^2/r4 = 6000 btu to keep
the building from freezing. some drums full of water or batteries inside
will help. what is the max summer temp? will the transmitter work at 70 c?
can the main heatmaking components be thermally-coupled to the ground?
>total btus generated in the room are 7500 watts.
about 25k btu/hr...
>it's windowless, no people and with r4 insulation all around.
remove the insulation, fill it with oil :-) and put the radiator on the side?
>the 7500 watts of heat are generated on a continual basis except
>during infrequent maintenance periods.
oh good. the heater will hardly ever have to turn on.
>the current unit is a self-contained carrier that sits on a pad and
>blows chilled air into the room. it's a 40000 btu unit with 10kw of
>resistance heating and a motor master for low temp operation and auto
>changeover thermostat for unattended operation.
perhaps you are locked into gas-pumping.
if so, consult your local hvac criminal.
nick
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