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Heat loss from copper tubes at various temperature differences between tube and air
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Values from the table below can be used to indicate the heat losses from uninsulated copper pipes:
| Nominal bore | Heat loss for fluid inside pipe | ||||||
| (W/m) | (Btu/hr.ft) | ||||||
| (mm) | (inches) | 40oC | 55oC | 72oC | 70oF | 100oF | 130oF |
| 15 | 1/2 | 21 | 32 | 45 | 22 | 34 | 47 |
| 22 | 3/4 | 28 | 43 | 60 | 29 | 45 | 53 |
| 28 | 1 | 34 | 53 | 76 | 36 | 56 | 79 |
| 35 | 1 1/4 | 41 | 64 | 89 | 43 | 67 | 93 |
| 42 | 1 1/2 | 47 | 74 | 104 | 49 | 77 | 108 |
| 54 | 2 | 59 | 93 | 131 | 62 | 97 | 136 |
| 67 | 2 1/2 | 71 | 111 | 156 | 74 | 116 | 162 |
| 76 | 3 | 83 | 129 | 181 | 87 | 135 | 189 |
| 108 | 4 | 107 | 165 | 232 | 111 | 172 | 241 |
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