8 1 2015 BRG PREMANT district heating pipe PRE Subject to technical changes Heat loss Insulation thickness 2 6 211 Heat loss during operation q U TB TE W m U Heat transfer coefficient W mK TB Average temperature between VL RL C TE Average ground temperature C U value Average temperature between VL RL TB C W mK 50 C 60 C 70 C 80 C 90 C 100 C 110 C 120 C 130 C 0 1110 4 4 5 5 6 7 7 8 8 9 10 0 11 1 12 2 13 3 0 1311 5 2 6 6 7 9 9 2 10 5 11 8 13 1 14 4 15 7 0 1424 5 7 7 1 8 5 10 0 11 4 12 8 14 2 15 7 17 1 0 1606 6 4 8 0 9 6 11 2 12 8 14 5 16 1 17 7 19 3 0 1794 7 2 9 0 10 8 12 6 14 4 16 1 17 9 19 7 21 5 0 2009 8 0 10 0 12 1 14 1 16 1 18 1 20 1 22 1 24 1 0 2105 8 4 10 5 12 6 14 7 16 8 18 9 21 0 23 2 25 3 0 2193 8 8 11 0 13 2 15 4 17 5 19 7 21 9 24 1 26 3 0 2530 10 1 12 7 15 2 17 7 20 2 22 8 25 3 27 8 30 4 0 2870 11 5 14 3 17 2 20 1 23 0 25 8 28 7 31 6 34 4 0 3047 12 2 15 2 18 3 21 3 24 4 27 4 30 5 33 5 36 6 0 2985 11 9 14 9 17 9 20 9 23 9 26 9 29 9 32 8 35 8 0 3412 13 6 17 1 20 5 23 9 27 3 30 7 34 1 37 5 40 9 0 3297 13 2 16 5 19 8 23 1 26 4 29 7 33 0 36 3 39 6 0 3425 13 7 17 1 20 5 24 0 27 4 30 8 34 2 37 7 41 1 0 3899 15 6 19 5 23 4 27 3 31 2 35 1 39 0 42 9 46 8 0 3357 13 4 16 8 20 1 23 5 26 9 30 2 33 6 36 9 40 3 0 3879 15 5 19 4 23 3 27 2 31 0 34 9 38 8 42 7 46 5 0 4381 17 5 21 9 26 3 30 7 35 0 39 4 43 8 48 2 52 6 0 4899 19 6 24 5 29 4 34 3 39 2 44 1 49 0 53 9 58 8 0 5405 21 6 27 0 32 4 37 8 43 2 48 6 54 0 59 4 64 9 Type of installation 2 pipe laid in the ground Pipe distance a 0 20 m Ground temperature TE 10 C Coverage height H 0 8 m Soil conductivity lE 1 2 W mK Conductivity of PE jacket lPE 0 4 W mK Conductivity of PUR foam lPUR 0 0260 W mK Heat losses q W m for one pipe PREMANT 26 9 110 33 7 110 42 4 125 48 3 125 60 3 140 76 1 160 88 9 180 114 3 225 139 7 250 168 3 280 219 1 355 273 0 450 323 9 500 355 6 560 406 4 630 457 2 710 508 0 800 610 0 900 711 0 1000 813 0 1100 914 0 1200 a H TE lE

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