Solid biofuels - Fuel specifications and classes - Part 5: Graded firewood (ISO 17225-5:2021)

This document determines the fuel quality classes and specifications of graded firewood. This document
covers only firewood produced from the following raw materials (see ISO 17725-1:2021, Table 1):
— 1.1.1 Whole trees without roots;
— 1.1.3 Stem wood;
— 1.1.4 Logging residues (thick branches, tops etc.);
— 1.2.1 Chemically untreated by-products and residues from wood processing industry.

Biogene Festbrennstoffe - Brennstoffspezifikationen und -klassen - Teil 5: Klassifizierung von Stückholz (ISO 17225-5:2021)

Dieses Dokument legt die qualitätsbezogenen Brennstoffklassen und  spezifikationen von klassifiziertem Stückholz fest. Dieses Dokument umfasst nur Stückholz, das aus folgenden Rohmaterialien hergestellt wurde (siehe ISO 17225-1:2021, Tabelle 1):
- 1.1.1 Vollbäume ohne Wurzeln;
- 1.1.3 Rundholz;
- 1.1.4 Waldrestholz (dicke Äste, Baumkronen usw.);
- 1.2.1 Chemisch unbehandelte Nebenprodukte und Rückstände aus Industrie-Restholz.

Biocombustibles solides - Classes et spécifications des combustibles - Partie 5: Classes de bois de chauffage (ISO 17225-5:2021)

Le présent document détermine les classes et spécifications de qualité du combustible pour le bois de chauffage. Le présent document couvre uniquement le bois de chauffage produit à partir des matières premières suivantes (voir ISO 17725-1:2021, Tableau 1):
—    1.1.1 Arbres entiers sans racines;
—    1.1.3 Grumes;
—    1.1.4 Rémanents forestiers (grosses branches, cimes, etc.);
—    1.2.1 Produits dérivés et sous-produits de l'industrie de transformation du bois sans traitement chimique.

Trdna biogoriva - Specifikacije goriv in razredi - 5. del: Razvrščena drva (ISO 17225-5:2021)

General Information

Status
Published
Public Enquiry End Date
01-Nov-2020
Publication Date
07-Sep-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
02-Aug-2021
Due Date
07-Oct-2021
Completion Date
08-Sep-2021

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SLOVENSKI STANDARD
SIST EN ISO 17225-5:2021
01-oktober-2021
Nadomešča:
SIST EN ISO 17225-5:2014

Trdna biogoriva - Specifikacije goriv in razredi - 5. del: Razvrščena drva (ISO 17225

-5:2021)

Solid biofuels - Fuel specifications and classes - Part 5: Graded firewood (ISO 17225-

5:2021)

Biogene Festbrennstoffe - Brennstoffspezifikationen und -klassen - Teil 5: Klassifizierung

von Stückholz (ISO 17225-5:2021)

Biocombustibles solides - Classes et spécifications des combustibles - Partie 5: Classes

de bois de chauffage (ISO 17225-5:2021)
Ta slovenski standard je istoveten z: EN ISO 17225-5:2021
ICS:
75.160.40 Biogoriva Biofuels
SIST EN ISO 17225-5:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 17225-5:2021
---------------------- Page: 2 ----------------------
SIST EN ISO 17225-5:2021
EN ISO 17225-5
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2021
EUROPÄISCHE NORM
ICS 27.190; 75.160.40 Supersedes EN ISO 17225-5:2014
English Version
Solid biofuels - Fuel specifications and classes - Part 5:
Graded firewood (ISO 17225-5:2021)

Biocombustibles solides - Classes et spécifications des Biogene Festbrennstoffe - Brennstoffspezifikationen

combustibles - Partie 5: Classes de bois de chauffage und -klassen - Teil 5: Klassifizierung von Stückholz

(ISO 17225-5:2021) (ISO 17225-5:2021)
This European Standard was approved by CEN on 12 June 2021.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 17225-5:2021 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 17225-5:2021
EN ISO 17225-5:2021 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

---------------------- Page: 4 ----------------------
SIST EN ISO 17225-5:2021
EN ISO 17225-5:2021 (E)
European foreword

This document (EN ISO 17225-5:2021) has been prepared by Technical Committee ISO/TC 238 "Solid

biofuels" in collaboration with Technical Committee CEN/TC 335 “Solid biofuels” the secretariat of

which is held by SIS.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by January 2022, and conflicting national standards shall

be withdrawn at the latest by January 2022.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN ISO 17225-5:2014.

Any feedback and questions on this document should be directed to the users’ national standards

body/national committee. A complete listing of these bodies can be found on the CEN websites.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 17225-5:2021 has been approved by CEN as EN ISO 17225-5:2021 without any

modification.
---------------------- Page: 5 ----------------------
SIST EN ISO 17225-5:2021
---------------------- Page: 6 ----------------------
SIST EN ISO 17225-5:2021
INTERNATIONAL ISO
STANDARD 17225-5
Second edition
2021-07
Solid biofuels — Fuel specifications
and classes —
Part 5:
Graded firewood
Biocombustibles solides — Classes et spécifications des
combustibles —
Partie 5: Classes de bois de chauffage
Reference number
ISO 17225-5:2021(E)
ISO 2021
---------------------- Page: 7 ----------------------
SIST EN ISO 17225-5:2021
ISO 17225-5:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 17225-5:2021
ISO 17225-5:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Symbols and abbreviated terms ........................................................................................................................................................... 2

5 Specification of graded firewood8 ..................................................................................................................................................... 2

Annex A (informative) Comparison of moisture content as received and dry basis ...........................................7

Annex B (informative) Measurement of firewood .................................................................................................................................. 9

Annex C (informative) Calculation of energy density.......................................................................................................................10

Bibliography .............................................................................................................................................................................................................................12

© ISO 2021 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 17225-5:2021
ISO 17225-5:2021(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/

iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 238, Solid biofuels.

This second edition cancels and replaces the first edition (ISO 17225-5:2014), which has been technically

revised. The main changes compared to the previous edition are as follows:
— Figure 1 and dimensions in Table 1 have been changed;
— Annex C has been changed.
A list of all parts in the ISO 17225 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2021 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 17225-5:2021
ISO 17225-5:2021(E)
Introduction

The objective of the ISO 17225 series is to provide unambiguous and clear classification principles for

solid biofuels; to serve as a tool to enable efficient trading of biofuels; to enable good understanding

between seller and buyer as well as a tool for communication with equipment manufacturers. It also

facilitates authority permission, procedures and reporting.

This document supports the use of graded firewood for residential, small commercial and public

buildings which require classified firewood quality.

The residential, small commercial and public building appliances require higher quality fuel for the

following reasons:

— Small-scale equipment does not usually have advanced controls and flue gas cleaning.

— Appliances are not generally managed by professional heating engineers.
— Appliances are often located in residential and populated districts.

NOTE 1 Firewood produced according to this document can be used in stoves, fireplaces, cookers, room

[1] [2]

heaters and multifired sauna stoves, which are tested according to European standards EN 13229, EN 12815,

[3] [4] [5] [6] [7]

EN 12809, EN 13240, EN 15250 and EN 15821, and boilers systems tested according to EN 303–5 .

NOTE 2 For individual contracts ISO 17225-1 can be used.

Although this document may be obtained separately, it requires a general understanding of the

standards based on and supporting ISO 17225-1. It is recommended to obtain and use ISO 17225-1 in

conjunction with this document.
© ISO 2021 – All rights reserved v
---------------------- Page: 11 ----------------------
SIST EN ISO 17225-5:2021
---------------------- Page: 12 ----------------------
SIST EN ISO 17225-5:2021
INTERNATIONAL STANDARD ISO 17225-5:2021(E)
Solid biofuels — Fuel specifications and classes —
Part 5:
Graded firewood
1 Scope

This document determines the fuel quality classes and specifications of graded firewood. This document

covers only firewood produced from the following raw materials (see ISO 17725-1:2021, Table 1):

— 1.1.1 Whole trees without roots;
— 1.1.3 Stem wood;
— 1.1.4 Logging residues (thick branches, tops etc.);

— 1.2.1 Chemically untreated by-products and residues from wood processing industry.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 14780, Solid biofuels — Sample preparation
ISO 16559, Solid biofuels — Terminology, definitions and descriptions

ISO 17225-1:2021, Solid biofuels — Fuel specifications and classes — Part 1: General requirements

ISO 18134-1, Solid biofuels — Determination of moisture content — Oven dry method — Part 1: Total

moisture — Reference method

ISO 18134-2, Solid biofuels — Determination of moisture content — Oven dry method — Part 2: Total

moisture — Simplified method

ISO 21945, Solid biofuels — Simplified sampling method for small scale applications

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 16559 and the following-

apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
firewood

cut and split oven-ready fuelwood used in household wood burning appliances like stoves, fireplaces

and central heating systems

Note 1 to entry: Firewood usually has a uniform length, typically in the range of 15 cm to 100 cm.

© ISO 2021 – All rights reserved 1
---------------------- Page: 13 ----------------------
SIST EN ISO 17225-5:2021
ISO 17225-5:2021(E)
Note 2 to entry: Cut-offs from virgin wood can also be used as a firewood.
3.2
commercial application

facility that utilizes solid biofuel burning appliances or equipment that have similar fuel

...

SLOVENSKI STANDARD
oSIST prEN ISO 17225-5:2020
01-oktober-2020

Trdna biogoriva - Specifikacije goriv in razredi - 5. del: Razvrščena drva (ISO/DIS

17225-5:2020)

Solid biofuels - Fuel specifications and classes - Part 5: Graded firewood (ISO/DIS

17225-5:2020)

Biogene Festbrennstoffe - Brennstoffspezifikationen und -klassen - Teil 5: Klassifizierung

von Stückholz (ISO/DIS 17225-5:2020)

Biocombustibles solides - Classes et spécifications des combustibles - Partie 5: Classes

de bois de chauffage (ISO/DIS 17225-5:2020)
Ta slovenski standard je istoveten z: prEN ISO 17225-5
ICS:
75.160.40 Biogoriva Biofuels
oSIST prEN ISO 17225-5:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN ISO 17225-5:2020
---------------------- Page: 2 ----------------------
oSIST prEN ISO 17225-5:2020
DRAFT INTERNATIONAL STANDARD
ISO/DIS 17225-5
ISO/TC 238 Secretariat: SIS
Voting begins on: Voting terminates on:
2020-07-14 2020-10-06
Solid biofuels — Fuel specifications and classes —
Part 5:
Graded firewood
Biocombustibles solides — Classes et spécifications des combustibles —
Partie 5: Classes de bois de chauffage
ICS: 27.190; 75.160.40
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 17225-5:2020(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. ISO 2020
---------------------- Page: 3 ----------------------
oSIST prEN ISO 17225-5:2020
ISO/DIS 17225-5:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 17225-5:2020
ISO/DIS 17225-5:2020(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Symbols and abbreviated terms ........................................................................................................................................................... 2

5 Specification of graded firewood ......................................................................................................................................................... 2

Annex A (informative) Comparison of moisture content as received and dry basis ...........................................5

Annex B (informative) Measurement of firewood .................................................................................................................................. 7

Annex C (informative) Calculation of energy density.......................................................................................................................... 8

Bibliography .............................................................................................................................................................................................................................10

© ISO 2020 – All rights reserved iii
---------------------- Page: 5 ----------------------
oSIST prEN ISO 17225-5:2020
ISO/DIS 17225-5:2020(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/

iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 238, Solid biofuels.

This second edition cancels and replaces the first edition (ISO 17225-5:2014), which has been technically

revised.
The main changes compared to the previous edition are as follows:
— Figure 1 and dimensions changed
A list of all parts in the ISO 17225 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved
---------------------- Page: 6 ----------------------
oSIST prEN ISO 17225-5:2020
ISO/DIS 17225-5:2020(E)
Introduction

The objective of the ISO 17225 series is to provide unambiguous and clear classification principles for

solid biofuels; to serve as a tool to enable efficient trading of biofuels; to enable good understanding

between seller and buyer as well as a tool for communication with equipment manufacturers. It also

facilitates authority permission procedures and reporting.

This part of ISO 17225 supports the use of graded firewood for residential, small commercial and public

buildings which require classified firewood quality.

The residential, small and commercial and public building applications require higher quality fuel for

the following reasons:

— Small-scale equipment does not usually have advanced controls and flue gas cleaning.

— Appliances are not generally managed by professional heating engineers.
— Appliances are often located in residential and populated districts.

NOTE 1 Firewood produced according to this part of ISO 17225 may be used in stoves, fireplaces, cookers,

[1]

roomheaters and multifired sauna stoves, which are tested according to European standards EN 13229 ,

[2] [3] [4] [5] [6]

EN 12815 , EN 12809 , EN 13240 , EN 15250 and EN 15821 , and boilers systems tested according to

[7]
EN 303–5 .
NOTE 2 For individual contracts ISO 17225-1 can be used.

Although these product standards may be obtained separately, they require a general understanding of

the standards based on and supporting ISO 17225-1. It is recommended to obtain and use ISO 17225-1

in conjunction with these standards.
© ISO 2020 – All rights reserved v
---------------------- Page: 7 ----------------------
oSIST prEN ISO 17225-5:2020
---------------------- Page: 8 ----------------------
oSIST prEN ISO 17225-5:2020
DRAFT INTERNATIONAL STANDARD ISO/DIS 17225-5:2020(E)
Solid biofuels — Fuel specifications and classes —
Part 5:
Graded firewood
1 Scope

This part of ISO 17225 determines the fuel quality classes and specifications of graded firewood. This

part of ISO 17225 covers only firewood produced from the following raw materials (see ISO 17725-1,

Table 1):
• 1.1.1 Whole trees without roots
• 1.1.3 Stem wood
• 1.1.4 Logging residues (thick branches, tops etc.)
• 1.2.1 Chemically untreated wood residues
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 16559, Solid biofuels — Terminology, definitions and descriptions

ISO 17225-1, Solid biofuels — Fuel specifications and classes — Part 1: General requirements

ISO 18134-1, Solid biofuels — Determination of moisture content — Oven dry method — Part 1: Total

moisture — Reference method

ISO 18134-2, Solid biofuels — Determination of moisture content — Oven dry method — Part 2: Total

moisture — Simplified method
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 16559 and the following-apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
firewood

cut and split oven-ready fuelwood used in household wood burning appliances like stoves, fireplaces

and central heating systems

Note 1 to entry: Firewood usually has a uniform length, typically in the range of 15 cm to 100 cm.

Note 2 to entry: Cut-offs from virgin wood can also be used as a firewood.
© ISO 2020 – All rights reserved 1
---------------------- Page: 9 ----------------------
oSIST prEN ISO 17225-5:2020
ISO/DIS 17225-5:2020(E)
3.2
commercial application

facility that utilises solid biofuel burning appliances or equipment that have similar fuel requirements

as residential appliances

Note 1 to entry: Commercial applications should not be confused with industrial applications, which can utilize a

much wider array of materials and have vastly different fuel requirements.
4 Symbols and abbreviated terms

The symbols and abbreviated terms used in this part of ISO 17225 comply with the SI system of units as

far as possible.
ar as received
D Designation for diameter (D) as received [cm]
d dry (dry basis)
3 3

E Designation for energy density as received, E [MJ/m or kWh/m loose or stacked volume or

MJ/kg, kWh/kg]
L Designation for length (L) as received [cm]
M Designation for moisture content as received on wet basis, M [% in mass]

Q Designation for net calorific value as received, q [MJ/kg or GJ/t or kWh/kg or MWh/t] at

p,net,ar
constant pressure
U Designation for moisture content on dry basis, U , [% in mass]

NOTE 1 1 MJ/kg or GJ/t equals 0,2778 kWh/kg (1 kWh/kg equals 1 MWh/t and 1 MWh/t is 3,6 MJ/kg). 1 g/

3 3
cm equals 1 kg/dm .
...

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