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