NBN EN 15316-2-3 : 2008

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols, units and indices
5 Principle of the method and definitions
6 Auxiliary energy demand
  6.1 General
  6.2 Design hydraulic power
  6.3 Detailed calculation method
      6.3.1 Input/output data
      6.3.2 Calculation method
      6.3.3 Correction factors
      6.3.4 Expenditure energy factor
      6.3.5 Intermittent operation
  6.4 Deviations from the detailed calculation method
  6.5 Monthly auxiliary energy demand
  6.6 Recoverable auxiliary energy
7 System thermal loss of distribution systems
  7.1 General
  7.2 Detailed calculation method
      7.2.1 Input/output data
      7.2.2 Calculation method
      7.2.3 Thermal losses of accessories
      7.2.4 Recoverable and un-recoverable system thermal loss
      7.2.5 Total system thermal loss
  7.3 Calculation of linear thermal transmittance (W/mK):
  7.4 Calculation of mean part load of distribution per zone
8 Calculation of supply and return temperature depending on
  mean part load of distribution
  8.1 Temperature calculation of heat emitters
      8.1.1 General
      8.1.2 Continuous control depending on outdoor temperature
      8.1.3 Continuous control with thermostatic valves
      8.1.4 On-Off control with room thermostat
  8.2 Effect of by-pass connections
  8.3 Effect of mixing valves
  8.4 Parallel connection of distribution circuits
  8.5 Primary circuits
Annex A (informative) Preferred procedures
 A.1 Simplified calculation method for determination of annual
     auxiliary energy demand
     A.1.1 Input/output data
     A.1.2 Calculation method
     A.1.3 Correction factors
     A.1.4 Expenditure energy factor
     A.1.5 Intermittent operation
     A.1.6 Monthly auxiliary energy demand and recoverable
           auxiliary energy
 A.2 Tabulated calculation method for determination of annual
     auxiliary energy demand
     A.2.1 Input/output data
     A.2.2 Calculation method, tabulated values
     A.2.3 Monthly auxiliary energy demand and recoverable
           auxiliary energy
 A.3 Simplified calculation method for determination of annual
     system thermal loss
     A.3.1 Input/output data
     A.3.2 Calculation method
     A.3.3 Approximation of the length of pipes per zone in
           distribution systems
     A.3.4 Default values of the outer total surface coefficient
           of heat transfer (convection and radiation)
     A.3.5 Approximation of [psi] -values
     A.3.6 Equivalent length of valves
     A.3.7 Default values for the exponent of the heat emission
           system
 A.4 Tabulated calculation method for determination of annual
     system thermal loss
     A.4.1 Input/output data
     A.4.2 Calculation method, tabulated values
 A.5 Example
Bibliography

Describes a methodology to calculate/estimate the system thermal loss of water based distribution systems for heating and the auxiliary energy demand, as well as the recoverable part of each. The actual recovered energy depends on the gain to loss ratio.