SIST-TP CEN/TR 12831-4:2018

Energy performance of buildings - Method for the calculation of the design heat load - Part 4: Explanation and justification of EN 12831-3, Module M8-2, M8-3

This technical report refers to standard EN 12831-3, module M8-2, M8-3.
It contains information to support the correct understanding, use and national adaptation of standard FprEN 12831-3.

Heizungsanlagen und wasserbasierte Kühlanlagen in Gebäuden - Methoden zur Berechnung der Norm-Heizlast - Teil 4: Begleitender TR zur EN 12831-3 (Heizlast von Trinkwarmwasseranlagen und Charakterisierung des Bedarfs)

Performance énergétique des bâtiments - Méthode de calcul de la charge thermique nominale - Partie 4 : Explication et justification de l’EN 12831-3, Modules M8-2, M8-3

Le présent rapport technique fait référence à l’EN 12831 3, modules M8-2, M8-3.
Il contient des informations permettant d’assurer une compréhension, une utilisation et une adaptation nationale correctes de la norme EN 12831 3.
Le présent rapport technique fait référence à l’EN 12831 3, modules M8-2, M8-3.
Il contient des informations permettant d’assurer une compréhension, une utilisation et une adaptation nationale correctes de la norme EN 12831 3.

Energijske lastnosti stavb - Metoda za izračun projektnih toplotnih obremenitev - 4. del: Razlaga in utemeljitev EN 12831-3 - Modula M8-2 in M8-3

To tehnično poročilo (CEN/TR 12831-4) določa podrobnosti za standard EN 12831-3 in podaja dodatne informacije za uporabo standarda EN 12831-3.

General Information

• Status: Published
• Public Enquiry End Date: 09-Jan-2017
• Publication Date: 17-Apr-2018
• ICS: 91.140.65 - Water heating equipment
• Technical Committee: OGS - Heating for buildings
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 05-Apr-2018
• Due Date: 10-Jun-2018
• Completion Date: 18-Apr-2018
• Directive: Not Harmonized2010/31/EU - Directive 2010/31/eu of the European Parliament and of the Council of 19 May 2010 on the energy performance of buildings (recast)
• Mandate: M/480 - Mandate to CEN, CENELEC and ETSI for the elaboration and adoption of standards for a methodology calculating the integrated energy performance of buildings and promoting the energy efficiency of buildings, in accordance with the terms set in the recast of the Directive on the energy performance buildings (2010/31/EU)
• Ref Project: CEN/TR 12831-4:2017 - Energy performance of buildings - Method for calculation of the design heat load - Part 4: Explanation and justification of EN 12831-3, Module M8-2, M8-3

Relations

• Refers: SIST EN 12831-3:2018 - Energy performance of buildings - Method for calculation of the design heat load - Part 3: Domestic hot water systems heat load and characterisation of needs, Module M8-2, M8-3
• Effective Date: 28-Jan-2026
• Refers: SIST EN 15603:2008 - Energy performance of buildings - Overall energy use and definition of energy ratings
• Effective Date: 28-Jan-2026
• Refers: SIST EN ISO 7345:1997 - Thermal insulation - Physical quantities and definitions (ISO 7345:1987)
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 9103:2015 - Aerospace series - Quality management systems - Variation management of key characteristics
• Effective Date: 28-Jan-2026

Overview

SIST-TP CEN/TR 12831-4:2018 is a technical report supporting the application of EN 12831-3, which forms part of the European standards for the energy performance of buildings (EPB). Specifically, Part 4 provides a comprehensive explanation and justification of the procedures outlined in EN 12831-3, focusing on modules M8-2 and M8-3 regarding the calculation of the design heat load for domestic hot water (DHW) systems.

This report, prepared by the CEN Technical Committee 228, is intended to assist national bodies, engineers, and professionals in understanding, utilizing, and adapting EN 12831-3 to local regulations, climatic conditions, and building practices. It ensures clarity and proper interpretation to support effective implementation in both new constructions and renovation projects aiming at improved energy efficiency.

Key Topics

• Purpose and Scope: Offers background, methodology, and rationale for the design heat load calculation for DHW systems.
• Method Explanation: Clarifies the main calculation approach in EN 12831-3 for evaluating the capacity of DHW systems to meet hot water demand securely.
• Input Parameters: Lists and explains the key input data required for the calculation, such as system type, tank size, temperature settings, hot water demand profiles, and distribution network characteristics.
• Worked Examples: Provides calculation examples to illustrate practical application of the standard’s methodology.
• Optimization Guidance: Offers insight on how modifying system parameters (like tank volume or heating power) affects the reliability and efficiency of hot water supply.
• Use of Calculation Flowcharts: Includes guidance on using flowcharts for systematic assessment, ensuring consistency and accuracy.

Applications

SIST-TP CEN/TR 12831-4:2018 is essential for:

• National Standardization: Helps national bodies adapt the core EN 12831-3 methodology to their specific needs, addressing local climatic and regulatory conditions.
• Engineering Design: Assists engineers in evaluating DHW systems during building design or renovation for optimal energy performance and reliable hot water supply.
• Building Code Implementation: Supports the inclusion of EPB standards in national or regional building codes, providing clear, systematic methods for required calculations.
• Compliance and Certification: Facilitates compliance with the Energy Performance of Buildings Directive (EPBD) and related certification schemes.
• System Optimization: Guides stakeholders in refining system components - such as storage tanks or heat generators - to adjust for under- or oversupply, improving energy efficiency and reducing costs.

Related Standards

• EN 12831-3:2017 - Energy performance of buildings - Method for calculation of the design heat load - Part 3: Domestic hot water systems heat load and characterisation of needs
• EN 15603:2008 - Energy performance of buildings - Overall energy use and definition of energy ratings
• EN ISO 7345:1995 - Thermal insulation - Physical quantities and definitions
• EN ISO 52000-1:2017 - Energy performance of buildings - Overarching EPB assessment - General framework and procedures
• CEN/TS 16628:2014 - Basic Principles for the set of EPB standards
• CEN/TS 16629:2014 - Detailed Technical Rules for the set of EPB standards

Practical Value

By providing explanations, worked examples, and structured methodology, SIST-TP CEN/TR 12831-4:2018 enhances the correct use and adaptation of EN 12831-3. Engineers, designers, and regulators benefit from increased confidence, accuracy, and efficiency in designing energy-saving building services. Its structured approach supports consistent application within European and national contexts, helping stakeholders meet both regulatory and performance objectives for sustainable buildings.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2018
(QHUJLMVNHODVWQRVWLVWDYE0HWRGD]DL]UDþXQSURMHNWQLKWRSORWQLKREUHPHQLWHY
GHO5D]ODJDLQXWHPHOMLWHY(10RGXOD0LQ0
Energy performance of buildings - Method for the calculation of the design heat load -
Part 4: Explanation and justification of EN 12831-3, Module M8-2, M8-3
Heizungsanlagen und wasserbasierte Kühlanlagen in Gebäuden - Methoden zur
Berechnung der Norm-Heizlast - Teil 4: Begleitender TR zur EN 12831-3 (Heizlast von
Trinkwarmwasseranlagen und Charakterisierung des Bedarfs)
Performance énergétique des bâtiments - Méthode de calcul de la charge thermique
nominale - Partie 4 : Explication et justification de l’EN 12831-3, Modules M8-2, M8-3
Ta slovenski standard je istoveten z: CEN/TR 12831-4:2017
ICS:
91.140.65 Oprema za ogrevanje vode Water heating equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

CEN/TR 12831-4
TECHNICAL REPORT
RAPPORT TECHNIQUE
April 2017
TECHNISCHER BERICHT
ICS 91.120.10; 91.140.10; 91.140.65
English Version
Energy performance of buildings - Method for calculation
of the design heat load - Part 4: Explanation and
justification of EN 12831-3, Module M8-2, M8-3
Performance énergétique des bâtiments - Méthode de Heizungsanlagen und wasserbasierte Kühlanlagen in
calcul de la charge thermique nominale - Partie 4 : Gebäuden - Methoden zur Berechnung der Norm-
Explication et justification de l'EN 12831-3, Modules Heizlast - Teil 4: Begleitender TR zur EN 12831-3
M8-2, M8-3 (Heizlast von Trinkwarmwasseranlagen und
Charakterisierung des Bedarfs)

This Technical Report was approved by CEN on 3 March 2017. It has been drawn up by the Technical Committee CEN/TC 228.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TR 12831-4:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Symbols and abbreviations . 6
4.1 Symbols . 6
4.2 Subscripts . 6
5 Information on the methods . 6
6 Method description . 7
6.1 Rationale, case of application . 7
6.2 Data input . 7
7 Worked out example . 7
7.1 Input data . 7
7.2 Calculation/result . 8
Annex A (informative) Calculation flowchart . 12
Bibliography . 13

European foreword
This document (CEN/TR 12831-4:2017) has been prepared by Technical Committee CEN/TC 228
“Heating systems and water based cooling systems in buildings”, the secretariat of which is held by DIN.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
Introduction
The set of EPB standards, technical reports and supporting tools
In order to facilitate the necessary overall consistency and coherence, in terminology, approach,
input/output relations and formats, for the whole set of EPB-standards, the following documents and
tools are available:
a) a document with basic principles to be followed in drafting EPB-standards:
CEN/TS 16628:2014, Energy Performance of Buildings — Basic Principles for the set of EPB
standards [1];
b) a document with detailed technical rules to be followed in drafting EPB-standards;
CEN/TS 16629:2014, Energy Performance of Buildings — Detailed Technical Rules for the set of
EPB-standards [2];
c) the detailed technical rules are the basis for the following tools:
1) a common template for each EPB-standard, including specific drafting instructions for the
relevant clauses;
2) a common template for each technical report that accompanies an EPB standard or a cluster of
EPB standards, including specific drafting instructions for the relevant clauses;
3) a common template for the spreadsheet that accompanies each EPB standard, to demonstrate
the correctness of the EPB calculation procedures.
Each EPB-standards follows the basic principles and the detailed technical rules and relates to the
overarching EPB-standard, EN ISO 52000-1:2017 [3].
One of the main purposes of the revision of the EPB-standards is to enable that laws and regulations
directly refer to the EPB-standards and make compliance with them compulsory. This requires that the
set of EPB-standards consists of a systematic, clear, comprehensive and unambiguous set of energy
performance procedures. The number of options provided is kept as low as possible, taking into
account national and regional differences in climate, culture and building tradition, policy and legal
frameworks (subsidiarity principle). For each option, an informative default option is provided.
Rationale behind the EPB technical reports
There is a risk that the purpose and limitations of the EPB standards will be misunderstood, unless the
background and context to their contents – and the thinking behind them – is explained in some detail
to readers of the standards. Consequently, various types of informative contents are recorded and made
available for users to properly understand, apply and nationally or regionally implement the EPB
standards.
If this explanation would have been attempted in the standards themselves, the result is likely to be
confusing and cumbersome, especially if the standards are implemented or referenced in national or
regional building codes.
Therefore each EPB standard is accompanied by an
...