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# Pipe insulation

Pipe insulation and heat losses

Calculation for heat transfer between pipe and environment.

1. Determine the volume flow.
2. Determine the wind speed (air speed around the pipe) to enable the outdoor simulation.
3. Choose the start temperature of your medium and the ambient temperature.
4. Define your medium via density and heat capacity.>
5. Describe pipe and insulation with their wall thickness and thermal conductivity.
6. Choose the quality of the surface to enable the correct consideration of radiation.
7. Surcharge value for thermal bridges: how is the pipeline supported?

The results for stationary heat transfer will be presented along the pipe at x1, x2 and x3. Values for outdoor installation (forced convection) and indoor installation (natural convection). Instationary heat transfer will be calculated for the time span chosen.

 Means of Calculation Steel Pipe Plastic pipe
 Plant Volume flow    * m³/h Pipe outside diameter  do * mm Wind strength  v * m/s Initial temperature  To * ºC Ambient temperature  T4 * ºC Fluid:   Density  ρo * kg/m³ Specific heat capacity  cpo * kJ/(kg K) Pipe wall:     s1 * mm Thermal conductivity   λ1 * W/(m K) Insulation:     s2 * mm Operational thermal conductivity   λ2 * W/(m K) Surface*   Aluminium blank Aluminium oxidized Zink coated steel blank Zink coated steel dusty not metallic austenite stainless x1=0 m          x2= * m          x3= * m Calculate non steady state heat transfer for  hour(s)

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