Heat loss through ground floor
Heat loss through ground floor
(OP)
I am struggling with calculating the heat loss through the ground floor of an internal room.
Walls, roofs, windows etc. no problem as I have a design external temperature (I use -8C) and known u values and the infiltration rate. For the floor of an internal room I can calculate the PA ratio of the whole building, but don't know how this relates to an internal room. Also don't know what to set the ground (external) temperature at because it will be much higher than the air temperature in winter.
Is there actually any heat loss?
Can you help?
Walls, roofs, windows etc. no problem as I have a design external temperature (I use -8C) and known u values and the infiltration rate. For the floor of an internal room I can calculate the PA ratio of the whole building, but don't know how this relates to an internal room. Also don't know what to set the ground (external) temperature at because it will be much higher than the air temperature in winter.
Is there actually any heat loss?
Can you help?





RE: Heat loss through ground floor
http://www.leedsbeckett.ac.uk/teaching/vsite/low_c...
Concrete slab thermal conductivity is only about 5x that of typical insulation materials.
TTFN (ta ta for now)
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RE: Heat loss through ground floor
What I don't want to do is just guess it or put an allowance in. I'd rather know the theory/calculation behind it.
Can you assist?
RE: Heat loss through ground floor
RE: Heat loss through ground floor
U for basement masonry If lights always on you can floor = 0.05 Btu/(hr - sq ft - deg F)
TD = indoor design deg F - ground temperature deg F
Outdoor design T deg F = -30 -20 -10 0 +10 +20
Ground T deg F = 40 45 50 55 60 65
From Carrier Handbook of Air Conditioning System Design Chapter 5 Tables 35 and 37.
If lights always on you can take credit for heat gain.
RE: Heat loss through ground floor