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Heat Loss of Copper Pipes

For various temperature differences between pipe and air

Heat loss for temperature difference (W/m)
Nominal bore in mm 40°C 55°C 72°C
½ 15 21 32 45
¾ 22 28 43 60
1 28 34 53 76
1¼ 35 41 64 94
1½ 42 47 73 104
2 54 59 93 131
2½ 67 71 111 156
3 76 83 129 181
4 108 107 165 232
Heat loss for temperature difference (Btu/hr ft)
Nominal bore in mm 70°F 100°F 130°F
½ 15 22 34 47
¾ 22 29 45 53
1 28 36 56 79
1¼ 35 43 67 93
1½ 42 49 77 103
2 54 62 97 136
2½ 67 74 116 162
3 76 87 135 189
4 108 111 172 241
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