Heat loss table

Hit Loss in watts per meter of pipe based on different pipe sizes and temperature difference between water temp. & ambient temp.

Hit Loss Table (Watts per Meter)
PIPE TYPE SDR 11 SDR 13.5
Pipe Size (inch) 1/2″ 3/4″ 1″ 1 1/4″ 1 1/2″ 2″ 1/2″ 3/4″ 1″ 1 1/4″ 1 1/2″ 2″
Pipe Size (mm) 15 20 25 32 40 50 15 20 25 32 40 50
K Value 3.58 4.35 4.39 4.38 4.37 4.39 4.53 5.47 5.47 5.48 5.48 5.48
Tempreture Difference between Fluid and Ambient (T1-T2) 5 17.9 21.8 22 21.9 21.9 21.9 22.7 27.4 27.4 27.4 27.4 27.4
10 35.8 43.5 44 43.8 43.7 43.8 45.3 54.7 54.7 54.7 54.8 54.8
15 53.7 65.3 65.9 65.7 65.6 65.8 68 82.1 82.1 82.2 82.2 82.2
20 71.7 87.1 87.9 87.6 87.5 87.7 90.6 109.4 109.5 109.5 109.6 109.6
25 89.6 108.8 104.9 107.5 109.3 109.6 113.3 136.7 136.8 136.9 137 137
30 107.5 130.6 131.8 131.4 131.2 131.6 136 164.1 164.2 164.3 164.4 164.4
35 125.4 152.4 153.8 153.4 153 153.5 158.6 191.5 191.6 191.7 191.7 191.8
40 143.3 174.2 175 175.3 174.9 175.4 181.2 218.8 219 219.1 219.1 219.2
45 161.2 195.9 197.7 197.2 196.7 197.4 203.9 246.2 246.3 246.4 246.5 246.6
50 179.1 217.7 219.7 219.1 218.6 219.3 226.6 273.5 273.7 273.8 273.9 274
55 197.1 239.5 241.7 241 240.5 241.2 249.2 300.9 301.1 301.2 301.3 301.4
60 215 261.2 263.7 262.9 262.3 263.2 271.9 328.2 328.4 328.6 328.7 328.8
65 232.9 283 285.6 284.8 284.2 285.1 294.5 355.5 355.8 356 356.1 356.2
70 250.8 304.8 307.6 306.7 306.1 307 317.2 382.9 383.2 383.4 383.5 383.6
75 268.7 326.5 329.6 328.6 327.9 328.9 339.8 410.2 410.5 410.7 410.9 411
80 286.6 348.3 351.5 350.5 349.8 350.9 362.5 437.6 437.9 438.1 438.3 438.4