Install Instructions
Quik Trak® Design and Installation Manual
21
Refer to the following instructions
to determine the flow per loop for
a room.
• The room is 12 ft. by 12 ft. with
the tubing installed at 7" o.c.
The load for the room is
40 BTU/h/ft
2
. The room is
15 ft. from the manifold location.
• First determine the amount of
tubing in the room.
12 x 12 = 144 sq. ft.
144 x 1.333 = 192 ft.
There is 192 ft. of active loop
in the room.
• Next, determine the amount of
leader length from the room to the
manifold location. The distance
from the room to the manifold
location is 15 ft. The distance is
doubled to account for the supply
and return tubing.
15 x 2 = 30 ft.
Vertical distance of tubing at the
manifold = 3 ft.
30 + 6 = 36 ft.
There is 36 feet of leader length
for this loop.
• Total loop length is the active and
leader length added together.
192 + 36 = 228 total loop length
• Determine the flow for the loop by
accessing data from the flow chart
at right.
1. Enter the chart at the BTU/h/ft
2
for the room (40) to get the value
in gallons per minute (gpm) per
foot of tubing (0.00236).
2. Multiply the active loop length by
the value found in the line above.
192 x 0.00236 = 0.45 gpm
3. Flow for the loop is 0.45 gpm.
100% Water at 120ºF (48.9°C)
20ºF (11.1°C) Supply/Return Differntial Flow in GPM Per Foot of Tubing
BTU/h/ft
2
7" tubing
on-center distance
50 0.00296
49 0.00290
48 0.00284
47 0.00278
46 0.00272
45 0.00266
44 0.00260
43 0.00254
42 0.00248
41 0.00242
40 0.00236
39 0.00231
38 0.00225
37 0.00219
36 0.00213
35 0.00207
34 0.00201
33 0.00195
32 0.00189
31 0.00183
30 0.00177
29 0.00171
28 0.00166
Appendix F — Flow Chart
Note: Flow is based on the active loop length in the room. Head
pressure drop is computed from the flow for the loop and the total loop
length. Do not use the total loop length to determine the flow for the
loop. See Appendix G for the hydronic friction loss table.
BTU/h/ft
2
7" tubing
on-center distance
27 0.00160
26 0.00154
25 0.00148
24 0.00142
23 0.00136
22 0.00130
21 0.00124
20 0.00118
19 0.00112
18 0.00106
17 0.00101
16 0.00095
15 0.00089
14 0.00083
13 0.00077
12 0.000071
11 0.00065
10 0.00059
9 0.00053
8 0.00047
7 0.00041
6 0.00035
5 0.00030