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Heat loss to surrounding air from insulated copper tubes
The heat loss from insulated copper pipes or tubes to surrounding air are
indicated below. The heat loss is based on
temperature difference 55 oC (99 oF) with insulation thickness
25 mm
(1 inch) and conductivity coefficient k =
0.043 W/m oC (0.3 Btu in/ft2 hr oF).
| Nominal bore |
Heat loss for fluid inside pipe |
| (mm) |
(inches) |
(W/m) |
(Btu/hr ft) |
| 22 |
3/4 |
8 |
8 |
| 28 |
1 |
10 |
10 |
| 42 |
1 1/2 |
11.5 |
12 |
| 54 |
2 |
14.5 |
15 |
| 67 |
2 1/2 |
16 |
17 |
| 76 |
3 |
19 |
20 |
- 1 W = 3.4 Btu/hr
- 1 ft (foot) = 0.3048 m
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