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- 24 Aug 2009
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@deuce
I am sure that your results are being falsified by your room-height and possibly by correction factors in the calculation software but that is a guess.
In order to be comfortable, you are only really interested in heating the bottom two metres of your room, however radiators at 70+ C will be heating a limited amount of air to a high temperature and this will rise (uselessly) into the roof. How it acts exactly as and when it cools and starts rolling back into the room I cannot say.
UFH on the other hand should ( by regulation) not exceed 30 C at floor level. Obviously with this, the air above will be heated to a lesser extent and rise less. UFH companies claim that this gives a temp of approx 20 C at around 1.8 m i.e. head-height. What happens above that I don't know/recall and don't know what heat you need to stop convection currents etc.
UFH circuits should not generally exceed 100 lm and at 10 cm centres that equals 10 m2 of floor. If you want to cover 60 m2 at 100 W/m2 you need 6 circuits which means two x 6 port manifolds ( feed and return).
If the budget is an absolute limit, it is not possible.
I am sure that your results are being falsified by your room-height and possibly by correction factors in the calculation software but that is a guess.
In order to be comfortable, you are only really interested in heating the bottom two metres of your room, however radiators at 70+ C will be heating a limited amount of air to a high temperature and this will rise (uselessly) into the roof. How it acts exactly as and when it cools and starts rolling back into the room I cannot say.
UFH on the other hand should ( by regulation) not exceed 30 C at floor level. Obviously with this, the air above will be heated to a lesser extent and rise less. UFH companies claim that this gives a temp of approx 20 C at around 1.8 m i.e. head-height. What happens above that I don't know/recall and don't know what heat you need to stop convection currents etc.
UFH circuits should not generally exceed 100 lm and at 10 cm centres that equals 10 m2 of floor. If you want to cover 60 m2 at 100 W/m2 you need 6 circuits which means two x 6 port manifolds ( feed and return).
If the budget is an absolute limit, it is not possible.