Install Instructions

IM-PR 566442 1114 (Design Manual)
82
Floor
Covering
R-Value
(hr•ft
2
•°F/
Btu)
Depth of
Tubing in
Concrete
(Inches)
Tubing
Spacing
(Inches)
Cooling Provided (Btu/hr/ft
2
)
16 14 11 9 7
Floor Surface Temperature (°F)
64 66 68 70 72
Required MCWT (°F)
0
0.75
6 58 61 64 67 69
9 53 56 60 64 67
12 47 51 56 60 64
1.5
6 58 60 64 66 69
9 54 58 61 65 68
12 50 54 59 62 66
3
6 55 58 62 65 68
9 53 56 60 64 67
12 50 54 58 62 66
6
6 48 52 57 61 65
9 46 51 56 60 64
12 45 49 55 59 64
0.25
0.75
6 56 59 62 65 68
9 53 56 60 64 67
12 49 53 58 62 66
1.5
6 54 58 61 65 68
9 52 55 60 63 67
12 49 53 57 61 65
3
6 51 55 59 63 66
9 49 53 58 62 66
12 47 51 56 60 64
6
6 44 48 54 59 63
9 43 47 53 58 63
12 41 46 52 57 62
Floor
Covering
R-Value
(hr•ft
2
•°F/
Btu)
Depth of
Tubing in
Concrete
(Inches)
Tubing
Spacing
(Inches)
Cooling Provided (Btu/hr/ft
2
), continued
16 14 11 9 7
Floor Surface Temperature (°F)
64 66 68 70 72
Required MCWT (°F)
0.5
0.75
6 52 56 60 63 67
9 50 53 58 62 66
12 47 51 56 60 64
1.5
6 50 54 59 62 66
9 48 52 57 61 65
12 45 50 55 59 64
3
6 47 51 56 60 65
9 45 50 55 59 64
12 43 48 54 58 63
6
6 40 45 51 56 61
9 38 44 50 56 61
12 37 42 49 55 60
Table 3-7 Required Mean Cooling Water Temperature (MCWT) to achieve target heat transfer as a function of tubing
depth, spacing and floor covering R-value. Chart assumes 78°F room drybulb and average interior surface temperature
(not counting the floor temperature), indoor conditions and no direct solar gain, 15% heat gain through the bottom of
the slab and indoor surface emissivity of 0.9 (standard for most opaque surfaces). Higher cooling capacities are possible
with direct solar gain.
Legend for Table 3-7.
Not recommended for spaces where the relative humidity exceeds 30% at 78°F drybulb.
Not recommended for spaces where the relative humidity exceeds 40% at 78°F drybulb.
Not recommended for spaces where the relative humidity exceeds 50% at 78°F drybulb.