Q-FLEX TECHNICAL DATA
WATER SYSTEM DESIGN: POINTS TO CONSIDER
THERMAL INSULATION
Thermal insulation requirements for water services are specified in the BCA /NCC and in AS/NZS 3500. Where pipe is installed in a climate which is prone to freezing, care must be taken to protect the pipes from damage caused by being exposed to temperatures resulting in the fluid within the pipes freezing. Veltanium Plus pipes are not able to withstand exposure to freezing conditions and it is recommended that for long periods of freezing temperatures the pipes are insulated, and that warm water is recirculated periodically to prevent freezing within the pipes. Alternatively, system exposed to freezing may be temporarily decommissioned and drained to prevent damage.
Insulation Heat Loss 16x2.2 PE-X
None W/m
9mm W/m
13mm W/m
25mm
W/m
31.3 27.2 36.8 38.3 43.3 48.9 51.8 59.2
11.2 10.0 12.9 13.0 14.9 15.9 17.7 18.7
9.5 8.5
7.1
12.7x0.91 Copper
6.5 8.0 8.0 9.0 9.4
20x2.8 PE-X
10.8 10.7 12.5 13.0 14.7 15.1
19.05x1.02 Copper
25x3.5 PE-X
25.4x1.22 Copper
32x4.4 PE-X
10.4 10.7
31.75x1.22 Copper
The heat losses are calculated based on: ■ ISO 12241 (Thermal insulation for building equipment and industrial installations – calculation rules) ■ Horizontal pipe installation indoors in still air ■ Laminar air flow over pipe/insulation ■ 1000 W/m2K
Emissivity of: (Emissivity is the measure of an object’s ability to emit infrared energy.): ■ 0.77 for copper (strongly oxidized) ■ 0.93 for polymer piping ■ 0.90 for insulation Thermal conductivity of: W/mK (watts per square metre of surface area for a temperature gradient of one kelvin for every metre thickness.)
■ 380 W/mK for copper pipes ■ 0.35 W/mk for PE-X pipes ■ 0.04 W/mK for insulation
■ Water temperature of 65°C ■ Ambient temperature of 20°C
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