Rmawdsley Posted December 4, 2020 Share Posted December 4, 2020 Hi, I may be over thinking it but does anyone know for the potential of condensation on the extract and supply ducts with UFH pipes being in close proximity. I will likely be using galvanised steel spiral wound duct which will pass through a PS10 253mm posi-joist and attached to the underside of the 1st floor T and G will be the underfloor heating pipes in a spreader plate. I'm sure the designers of either of the systems will have a good idea but I'm just trying to keep on top of things and would appreciate peoples thoughts? Thanks! Link to comment Share on other sites More sharing options...
Temp Posted December 4, 2020 Share Posted December 4, 2020 Condensation is less likely at higher temperatures. So I would expect proximity to ufh pipes to make condensation in mhrv duct less likely. Link to comment Share on other sites More sharing options...
Temp Posted December 4, 2020 Share Posted December 4, 2020 PS Duct should be insulated anyway. Link to comment Share on other sites More sharing options...
Rmawdsley Posted December 4, 2020 Author Share Posted December 4, 2020 If we were to run the ASHP in cooling mode in summer could that potentially cause a problem then? Link to comment Share on other sites More sharing options...
tonyshouse Posted December 4, 2020 Share Posted December 4, 2020 Yes, you will definitely risk getting condensation on the ducts if you use it in cooling mode, this will drip off and stain the ceiling. Insulating the ducts will reduce but not eliminate the problem. Good design will negate the problem, ideally by designing out the need for air cooling. Link to comment Share on other sites More sharing options...
Rmawdsley Posted December 4, 2020 Author Share Posted December 4, 2020 Sorry, it wouldn’t be the MVHR that I would be cooling it would be the UFH to cool the floor, If that makes any difference. I think I’ll end up insulating the duct for piece of mind. Link to comment Share on other sites More sharing options...
tonyshouse Posted December 5, 2020 Share Posted December 5, 2020 Need to be very careful running cooled water to make sure that the cooled water temperature stays above dew point temperature Link to comment Share on other sites More sharing options...
SteamyTea Posted December 5, 2020 Share Posted December 5, 2020 Calculate it. https://www.calculator.net/dew-point-calculator.html Link to comment Share on other sites More sharing options...
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