8 1 2015 BRG PREMANT district heating pipe PRE Subject to technical changes Heat loss Insulation thickness 3 6 212 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 1019 4 1 5 1 6 1 7 1 8 2 9 2 10 2 11 2 12 2 0 1186 4 7 5 9 7 1 8 3 9 5 10 7 11 9 13 0 14 2 0 1294 5 2 6 5 7 8 9 1 10 3 11 6 12 9 14 2 15 5 0 1442 5 8 7 2 8 7 10 1 11 5 13 0 14 4 15 9 17 3 0 1562 6 2 7 8 9 4 10 9 12 5 14 1 15 6 17 2 18 7 0 1754 7 0 8 8 10 5 12 3 14 0 15 8 17 5 19 3 21 0 0 1857 7 4 9 3 11 1 13 0 14 9 16 7 18 6 20 4 22 3 0 1930 7 7 9 7 11 6 13 5 15 4 17 4 19 3 21 2 23 2 0 2162 8 6 10 8 13 0 15 1 17 3 19 5 21 6 23 8 25 9 0 2388 9 6 11 9 14 3 16 7 19 1 21 5 23 9 26 3 28 7 0 2505 10 0 12 5 15 0 17 5 20 0 22 5 25 0 27 6 30 1 0 2514 10 1 12 6 15 1 17 6 20 1 22 6 25 1 27 7 30 2 0 2774 11 1 13 9 16 6 19 4 22 2 25 0 27 7 30 5 33 3 0 2676 10 7 13 4 16 1 18 7 21 4 24 1 26 8 29 4 32 1 0 3044 12 2 15 2 18 3 21 3 24 3 27 4 30 4 33 5 36 5 0 3435 13 7 17 2 20 6 24 0 27 5 30 9 34 4 37 8 41 2 0 2704 10 8 13 5 16 2 18 9 21 6 24 3 27 0 29 7 32 4 0 3105 12 4 15 5 18 6 21 7 24 8 27 9 31 1 34 2 37 3 0 3494 14 0 17 5 21 0 24 5 28 0 31 4 34 9 38 4 41 9 0 3895 15 6 19 5 23 4 27 3 31 2 35 1 39 0 42 8 46 7 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 9 125 33 7 125 42 4 140 48 3 140 60 3 160 76 1 180 88 9 200 114 3 250 139 7 280 168 3 315 219 1 400 273 0 500 329 0 560 355 3 630 406 4 670 457 2 710 508 0 900 610 0 1000 711 0 1100 813 0 1200 a H TE lE

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