NEN EN ISO 12241 : 2008

1 Scope
2 Normative references
3 Definitions, symbols and abbreviations
    3.1 Physical quantities, symbols and units
    3.2 Subscripts
4 Calculation methods for heat transfer
    4.1 Fundamental equations for heat transfer
    4.2 Surface temperature
    4.3 Prevention of surface condensation
5 Calculation of the temperature change in pipes, vessels
    and containers
    5.1 Longitudinal temperature change in a pipe
    5.2 Temperature change and cooling times in pipes,
          vessels and containers
6 Calculation of cooling and freezing times of stationary
    liquids
    6.1 Calculation of the cooling time for a given
          thickness of insulation to prevent the freezing
          of water in a pipe
7 Thermal bridges
8 Underground pipelines
    8.1 Calculation of heat loss (single line)
9 Tables and Diagrams
Annex A (informative) Comments on thermal conductivity
Annex B (informative) Examples
    B.1 Calculation of the necessary insulation thicknesses
          for a double layered wall of a firebox
    B.2 Heat flow rate and surface temperature of an
          insulated pipe
    B.3 Temperature drop in a pipe
    B.4 Temperature drop in a container
    B.5 Cooling and freezing times in a pipe
    B.6 Underground pipeline
    B.7 Required insulation thickness to prevent surface
          condensation
Annex C (informative) Bibliography

Provides rules for the calculation of heat-transfer-related properties of building equipment and industrial installations, predominantly under steady-state conditions. It also provides a simplified approach for the treatment of thermal bridges.