Quote:
Originally Posted by gregbradley
Metal is often colder than ambient.
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I hate to be picky Greg, but this violates at least the first law of thermodynamics, unless something is cooling the metal, it cannot be colder than the surrounding air. It will FEEL colder due to its greater thermal conductivity, but it won't be physically colder.
The advice given is quite valid nonetheless, but I think Phil's problem is lack of air circulating through the dome, once the sun comes up and starts to warm the exterior of the dome, then everything inside will be colder than the dome roof, hence it will all collect water if there's enough humidity.
My roll off roof observatory, without any insulation, but with timber walls, doesn't seem to suffer, but there's quite a good gap around the top of the walls which allows for heaps of ventilation. Good at this time of year for getting rid of unwanted moisture, bad when it's windy and dust gets blown in.
Cheers
Stuart