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Re: Best way to install radiant
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Posted by BC on Monday, 7 December 2009, at 9:24 p.m.,
in response to Re: Best way to install radiant, posted by Barry
I'm not completely buying the perimeter insulation only/thermal mass arguement, but I need to think about it some more before commenting further to avoid foot-in-mouth syndrome. At the very least I would caution that it is certainly not applicable to all situations depending on climate, soil type, groundwater flow, etc.
I can't let the last comment slide, though - convection has virtually nothing to do with heat transfer in a slab or in the ground unless you're in the middle of a bog or Yellowstone or something. Heat in a slab goes from hot to cold, period.
And the reason radiant floor systems are frequently placed in slabs has much more to do with the slab providing a cost-effective way to conduct the heat from the tube to the floor surface. Unless you're specifically designing your structure around it, thermal mass doesn't necessarily do anything for you, except perhaps compensate for a lousy control system.
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