BS EN 15316-4-7:2008

Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions, symbols and units
  3.1 Terms and definitions
  3.2 Symbols and units
4 Principle of the method
  4.1 Heat balance of the biomass combustion sub-system,
      including control of heat generation
      4.1.1 Physical factors for biomass combustion sub-system
            (biomass boiler) taken into account
      4.1.2 Calculation structure (input and output data)
  4.2 Generation sub-system basic energy balance
  4.3 Auxiliary energy
  4.4 Recoverable, recovered and unrecoverable system thermal
      losses
  4.5 Calculation steps
  4.6 Using net or gross calorific values
  4.7 Boundaries between distribution and generation sub-system
5 Biomass combustion sub-system calculation
6 Calculation method for boilers with automatic stocking
7 Calculation method for boilers with stocking by hand
  7.1 Available methodologies
  7.2 Operation periods
      7.2.1 General
      7.2.2 Heating up operation cycle
      7.2.3 Boiler heating operation cycle
      7.2.4 Cooling down operation cycle
      7.2.5 Boiler non operation cycle
  7.3 Case specific boiler efficiency method
      7.3.1 Principle of the method
      7.3.2 Input data to the method
      7.3.3 Load of the boiler
      7.3.4 Biomass boiler thermal losses
      7.3.5 Total auxiliary energy
      7.3.6 Recoverable generation system thermal losses
      7.3.7 Fuel input
      7.3.8 Operating temperature of the biomass boiler
  7.4 Boiler cycling method
      7.4.1 Principle of the method
      7.4.2 Input data for the calculation method
      7.4.3 Load factor
      7.4.4 Specific thermal losses
      7.4.5 Total thermal losses
      7.4.6 Auxiliary energy
      7.4.7 Recoverable system thermal losses
      7.4.8 Calculation procedure for a modulating biomass
            boiler (fan assisted)
Annex A (informative) - Additional formulas and default values
        for parametering the case specific boiler efficiency
        method
      A.1 Information on the method
          A.1.1 Basic assumptions and intended use
          A.1.2 Known approximations
      A.2 Boiler efficiencies and stand-by heat losses
          A.2.1 Default values for boiler efficiency at full
                load and intermediate load as a function of
                the boiler power output
          A.2.2 Stand-by heat losses
          A.2.3 Correction factor taking into account variation
                of efficiency depending on boiler average water
                temperature
      A.3 Auxiliary energy
      A.4 Recoverable boiler thermal losses
          A.4.1 Auxiliary energy
          A.4.2 Thermal losses (boiler envelope)
          A.4.3 Default data according to boiler location
Annex B (informative) - Additional formulas and default values
        for parametering the boiler cycling method
      B.1 Information on the method
          B.1.1 Basis assumptions and intended use
          B.1.2 Known approximations
      B.2 Default specific losses
          B.2.1 Default data for calculation of thermal losses
                through the chimney with boiler on
          B.2.2 Default values for calculation of thermal losses
                through the boiler envelope
          B.2.3 Default values for calculation of thermal losses
                through the chimney with the boiler off
      B.3 Default values for calculation of auxiliary energy
      B.4 Additional default data for modulating burners
Annex C (informative) - Storage systems for biomass combustion
        systems
      C.1 General
          C.1.1 Accumulator storage system
          C.1.2 Load balancing storage system
      C.2 Sizing of storage systems for biomass combustion systems
          C.2.1 Sizing of the volume of the accumulator storage tank
          C.2.2 Sizing of the volume of the load balancing tank
      C.3 System thermal losses of storage systems
          C.3.1 Thermal losses
          C.3.2 Auxiliary energy of the circulation pump
Annex D (informative) - Calculation procedure with an example
        for biomass boiler with stocking by hand - Case
        specific boiler efficiency method
Annex E (informative) - Calculation procedure with an example
        for biomass boiler with stocking by hand (Cycling
        method)
Bibliography

Regularizes the required inputs; calculation method; and resulting outputs, for space heating generation by biomass combustion sub-systems (boilers) with stocking by hand, including control.

This European Standard is part of a series of standards on the method for calculation of system energy requirements and system efficiencies of space heating systems and domestic hot water systems.

The scope of this specific part is to standardise the:

• required inputs;

• calculation method;

• resulting outputs,

for space heating generation by biomass combustion sub-systems (boilers) with stocking by hand, including control.

This European Standard is also intended for the case of generation for both domestic hot water production and space heating. The case of generation only for domestic hot water production is treated in EN 15316-3-3.