EN ISO 12241:2008

Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols
  3.1 Terms and definitions
  3.2 Definition of symbols
  3.3 Subscripts
4 Calculation methods for heat transfer
  4.1 Fundamental equations for heat transfer
  4.2 Surface temperature
  4.3 Prevention of surface condensation
  4.4 Determination of total heat flow rate for plane walls,
      pipes and spheres
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
  6.2 Calculation of the freezing time of water in a pipe
7 Determination of the influence of thermal bridges
  7.1 General
  7.2 Calculation of correction terms for plane surfaces
  7.3 Calculation of correction terms for pipes
8 Underground pipelines
  8.1 General
  8.2 Calculation of heat loss (single line) without channels
  8.3 Other cases
Annex A (normative) - Thermal bridges in pipe insulation
Annex B (informative) - Projecting thermal bridges of roughly
        constant cross-section
Annex C (informative) - Examples
Bibliography

ISO 12241:2008 gives rules for the calculation of heat-transfer-related properties of building equipment and industrial installations, predominantly under steady-state conditions. ISO 12241:2008 also gives a simplified approach for the treatment of thermal bridges.