ISO 13579-11:2017
Industrial furnaces and associated processing equipment — Method of measuring energy balance and calculating energy efficiency — Part 11: Evaluation of various kinds of efficiency
ISO 13579-11:2017 specifies classifications and designations in the methodology of energy efficiency evaluation of industrial furnaces and associated processing equipment (TPE), including energy efficiency in terms of exergy as well as enthalpy.
ISO 13579-11:2017does not apply to the following types of TPE:
- blast furnaces, basic oxygen furnaces, coke ovens;
- furnaces that generate gases to be used as fuel (including by-product gases);
- special atmosphere gas generators;
- industrial furnaces that are designed for chemical plants or petroleum plants;
- installations where heating or combustion is performed in an open space;
- installations that combust solid fuel;
- waste incinerators.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Boundary and energy (enthalpy)
5.1 Configuration of the area of evaluation
5.2 Classification of boundary
5.3 Classification of energy (enthalpy)
5.4 Calculation of energy (enthalpy)
5.4.1 Energy input to the heating chamber (Eh)
5.4.2 Energy required for process (Epr)
5.4.3 Sensible heat of exhaust gas at the outlet of combustion chamber
5.4.4 Sensible heat of exhaust gas at the outlet of heat recovery equipment
5.4.5 Sensible heat of exhaust gas at the inlet of heat recovery equipment
5.4.6 Recovery heat (Eh,re)
5.4.7 Thermal energy loss (El)
5.4.8 Electrical energy loss in electroheating (El,eh)
5.4.9 Energy consumed in auxiliary equipment (Eaux)
5.4.10 Energy consumed in generation of utilities (Eu,gen)
5.4.11 Electrical generation loss (El,eg)
5.4.12 Fuel equivalent energy of electricity (Efe,el)
5.4.13 Recycled energy (Ercy)
6 Efficiency based on enthalpy
6.1 General formula
6.2 Examples of typical efficiencies
6.2.1 General
6.2.2 Overall efficiency in accordance with ISO 13579‑1
6.2.3 Heat efficiency on the whole calorific value basis
6.2.4 Heat efficiency on the supplied calorific value basis
6.2.5 Available heat ratio
6.2.6 Combustion efficiency
6.2.7 Effective waste heat recovery ratio in combustion furnace
6.2.8 Waste heat recovery ratio as performance indicator of heat recovery equipment
6.2.9 Ratio of waste heat of combustion exhaust gas to calorific value of fuel
6.2.10 Converted available heat ratio where waste heat recovery is not considered
7 Efficiency based on exergy
7.1 General
7.2 Boundary
7.3 Classification of exergy
7.4 Calculation of exergy
7.4.1 Exergy input from electrical source (EXh,el)
7.4.2 Exergy of fuel (EXh,fuel)
7.4.3 Exergy of exothermic reaction (EXreact,exo)
7.4.4 Exergy of sensible heat of fluid at the inlet (EXs,fluid)
7.4.5 Exergy in energy required for drying and evaporation (EXpr,ev)
7.4.6 Exergy required for endothermic reaction for heated material (EXpr,re)
7.4.7 Exergy in given enthalpy to product (EXpr,en)
7.4.8 Exergy of exhaust gas (EXex,oc, EXex,or, EXex,ir)
7.4.9 Recovery exergy (EXh,re)
7.4.10 Exergy in required for heating jigs and other substance (EXl,j)
7.4.11 Exergy in heat loss from furnace structure (EXl,fs)
7.4.12 Exergy in energy required for heat storage of furnace structure (EXl,hs)
7.4.13 Exergy in given enthalpy to atmosphere gas (EXl,atm)
7.4.14 Exergy consumed in electroheating (EXl,eh)
7.4.15 Exergy consumed in auxiliary equipment (EXaux)
7.4.16 Exergy consumed in generation of utilities (EXu,gen)
7.4.17 Exergy of recycled energy (EXrcy)
7.5 Efficiency
7.5.1 General formula
7.5.2 Examples of typical efficiencies
8 Designation
8.1 General
8.2 Individual item block
8.3 Type of operation
8.4 Energy source
8.5 Example
9 Measurement
10 Evaluation report
Annex A (informative) Example of energy efficiency evaluation
Annex B (informative) Comparison of enthalpy efficiency and exergy efficiency of continuous reheating furnaces
Annex C (informative) Procedure for estimation of energy saving effect of combustion furnaces
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Boundary and energy (enthalpy)
5.1 Configuration of the area of evaluation
5.2 Classification of boundary
5.3 Classification of energy (enthalpy)
5.4 Calculation of energy (enthalpy)
5.4.1 Energy input to the heating chamber (Eh)
5.4.2 Energy required for process (Epr)
5.4.3 Sensible heat of exhaust gas at the outlet of combustion chamber
5.4.4 Sensible heat of exhaust gas at the outlet of heat recovery equipment
5.4.5 Sensible heat of exhaust gas at the inlet of heat recovery equipment
5.4.6 Recovery heat (Eh,re)
5.4.7 Thermal energy loss (El)
5.4.8 Electrical energy loss in electroheating (El,eh)
5.4.9 Energy consumed in auxiliary equipment (Eaux)
5.4.10 Energy consumed in generation of utilities (Eu,gen)
5.4.11 Electrical generation loss (El,eg)
5.4.12 Fuel equivalent energy of electricity (Efe,el)
5.4.13 Recycled energy (Ercy)
6 Efficiency based on enthalpy
6.1 General formula
6.2 Examples of typical efficiencies
6.2.1 General
6.2.2 Overall efficiency in accordance with ISO 13579‑1
6.2.3 Heat efficiency on the whole calorific value basis
6.2.4 Heat efficiency on the supplied calorific value basis
6.2.5 Available heat ratio
6.2.6 Combustion efficiency
6.2.7 Effective waste heat recovery ratio in combustion furnace
6.2.8 Waste heat recovery ratio as performance indicator of heat recovery equipment
6.2.9 Ratio of waste heat of combustion exhaust gas to calorific value of fuel
6.2.10 Converted available heat ratio where waste heat recovery is not considered
7 Efficiency based on exergy
7.1 General
7.2 Boundary
7.3 Classification of exergy
7.4 Calculation of exergy
7.4.1 Exergy input from electrical source (EXh,el)
7.4.2 Exergy of fuel (EXh,fuel)
7.4.3 Exergy of exothermic reaction (EXreact,exo)
7.4.4 Exergy of sensible heat of fluid at the inlet (EXs,fluid)
7.4.5 Exergy in energy required for drying and evaporation (EXpr,ev)
7.4.6 Exergy required for endothermic reaction for heated material (EXpr,re)
7.4.7 Exergy in given enthalpy to product (EXpr,en)
7.4.8 Exergy of exhaust gas (EXex,oc, EXex,or, EXex,ir)
7.4.9 Recovery exergy (EXh,re)
7.4.10 Exergy in required for heating jigs and other substance (EXl,j)
7.4.11 Exergy in heat loss from furnace structure (EXl,fs)
7.4.12 Exergy in energy required for heat storage of furnace structure (EXl,hs)
7.4.13 Exergy in given enthalpy to atmosphere gas (EXl,atm)
7.4.14 Exergy consumed in electroheating (EXl,eh)
7.4.15 Exergy consumed in auxiliary equipment (EXaux)
7.4.16 Exergy consumed in generation of utilities (EXu,gen)
7.4.17 Exergy of recycled energy (EXrcy)
7.5 Efficiency
7.5.1 General formula
7.5.2 Examples of typical efficiencies
8 Designation
8.1 General
8.2 Individual item block
8.3 Type of operation
8.4 Energy source
8.5 Example
9 Measurement
10 Evaluation report
Annex A (informative) Example of energy efficiency evaluation
Annex B (informative) Comparison of enthalpy efficiency and exergy efficiency of continuous reheating furnaces
Annex C (informative) Procedure for estimation of energy saving effect of combustion furnaces
Bibliography