[EnergyPlus_Support] Re: Underfloor Heating

["jeannieboef@xxxxxxxxx" <jeannieboef@xxxxxxxxx>]

The physical restriction is often the limited radiant area. At least  
with heating, condensation is not your problem...however the surface  
temperature should not exceed 30 deg C, else it starts impacting on  
comfort in several ways.

So heat transfer is (broadly ) a function of the difference between
1) radiant Surface temperature
2) zone air temperature
and
3) the amount of transfer surface

Pointers:
- Control that your surface temp is about 30 deg C
- Check what the heating load to be met is in W/m2
- Do a hand calculation given the dT of Air temp 20 deg C and surface  
temp 30 deg C to see what kind of W/m2 you are expecting from your  
heated floor (you will have to assume a convection coeff...neglect  
radiation exchange for now).

If your heating loads are too much for the floor you must,
- reduce heating loads (i.e. Cold air comming in or thermal losses  
through the windows and walls)
- consider adding other extra heating equipment

Mit freundlichen Grüßen- Sent from my iPhone (excuse the brevity)

i. A.
Jean Marais
b.i.g. bechtold
Tel.   +49 30 6706662-23

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