9 3 2015 CALPEX district heating pipe CPX Subject to technical changes 1 220 Heat loss Heating 6 bar sanitary 10 bar QUADRIGA CALPEX QUADRIGA Heat losses q W m for one QUADRIGA pipe CALPEX QUADRIGA U value Average operating temperature TB C W mK 50 55 60 65 H 25 25 S 28 22 142 0 159 6 34 7 13 7 93 8 72 H 32 32 S 28 22 142 0 184 7 34 8 26 9 18 10 10 H 32 32 S 32 22 142 0 199 7 97 8 96 9 96 10 96 H 40 40 S 40 28 162 0 235 9 40 10 58 11 75 12 93 Type of installation for QUADRIGA Cover above pipe Ground temperature Soil conductivity Conductivity of PUR foam Conductivity of PEXa pipe Conductivity of PE pipe 1 pipe laid in the ground H 0 80 m TE 10 C E 1 0 W mK PU 0 0234 W mK PEX 0 38 W mK PE 0 33 W mK CALPEX QUADRIGA heat loss during operation Heat loss during operation q U TB TE W m U Heat transfer coefficient W mK TB Average operating temperature C TE Average ground temperature C Example of calculation for average operating temperature TB C Flow heating 70 C Return heating 40 C Flow sanitary 60 C Return sanitary 50 C 70 40 60 50 TB 55 C 4 TE E H 0 8 m

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