SIST EN 12831-3:2018/oprA1:2021
(Amendment)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
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
This European Standard describes a method to calculate the power and the storage volume required for the dimensioning of domestic hot water systems (DHW). The applicability ranges from direct water heaters (no storage volume and a comparatively large effective heating power) to larger storage systems with a comparatively small heating power and large storage volumes.
This European Standard is applicable to the following water storage systems:
- storage systems characterized by a minimal mixing zone, (such as stratified charging storage tanks or storage tanks with external heat exchangers): these systems are nominated in this standard as "charging storage systems";
- storage tank water heaters and warm water storage tanks with a pronounced mixing zone (such as DHW storage tanks with internal heat exchangers), nominated in this standard as "mixed storage systems";
and for different uses.
The Scope also includes standardization methods for determining the energy need for domestic hot water. This European Standard covers the domestic hot water needs in buildings.
The calculation of the energy needs for DHW-Systems applies to residential and non-residential buildings, a building or a zone of a building.
Figure 1 shows the relative position of this standard within the set of EPB standards in the context of the modular structure as set out in EN ISO 52000-1.
NOTE 1 In CEN ISO/TR 52000-2 the same table can be found, with, for each module, the numbers of the relevant EPB standards and accompanying technical reports that are published or in preparation.
NOTE 2 The modules represent EPB standards, although one EPB standard may cover more than one module and one module may be covered by more than one EPB standard, for instance a simplified and a detailed method respectively. See also Clause 2 and Tables A.1 and B.1.
Table 1 shows the relative position of this standard within the EPB package of standards.
(...)
Energetische Bewertung von Gebäuden - Verfahren zur Berechnung der Norm-Heizlast - Teil 3: Trinkwassererwärmungsanlagen, Heizlast und Bedarfsbestimmung, Module M8-2, M8-3
Performance énergétique des bâtiments - Méthode de calcul de la charge thermique nominale - Partie 3: Charge thermique des systèmes de production d'eau chaude sanitaire et caractérisation des besoins, Module M8-2, M8-3
No scope available
Energijske lastnosti stavb - Metoda za izračun projektnih toplotnih obremenitev - 3. del: Sistemi za pripravo tople sanitarne vode, toplotna obremenitev in opredelitev potreb - Modula M8-2 in M8-3 - Dopolnilo A1
General Information
Relations
Overview
SIST EN 12831-3:2018/oprA1:2021 is a European Standard developed by CEN that provides a comprehensive method for calculating the design heat load specifically for domestic hot water (DHW) systems in buildings. This standard is part three of the EN 12831 series, focusing on the heat load and characterization of needs for DHW systems under Modules M8-2 and M8-3. It covers the calculation of both the required heating power and storage volume for a wide range of systems, from direct water heaters to larger storage-based water heating systems.
This standard addresses various types of water storage systems including:
- Charging storage systems – characterized by minimal mixing zones, such as stratified charging tanks or tanks with external heat exchangers.
- Mixed storage systems – tanks with pronounced mixing zones, such as those with internal heat exchangers.
SIST EN 12831-3:2018/oprA1:2021 applies to both residential and non-residential buildings, encompassing entire buildings or specific zones, and standardizes the approach for determining the energy needs of DHW systems.
Key Topics
Calculation of Design Heat Load
Provides formulas and methods for calculating the heating power and storage volume needed for domestic hot water systems, ensuring accurate dimensioning of both direct water heaters and storage systems.System Classification
Distinguishes between charging storage systems and mixed storage systems, clarifying different operational characteristics influencing heat load calculations.Energy Need Computation
Includes methods for determining energy requirements based on factors such as floor area, volume of water usage, and temperatures of hot and cold water.Updated Formulas and Parameters
Incorporates modifications to formulas related to effective reheat energy and power, and includes explanations about the effective nominal power of heat generators and heat exchangers.Reference Temperature Adjustments
Provides guidelines for converting energy need values based on varying reference water temperatures to maintain accuracy across different climatic and system conditions.Integration Within EPB Standards
EN 12831-3 is aligned with the modular structure of Energy Performance of Buildings (EPB) standards, fitting seamlessly within the broader framework established by EN ISO 52000-1.
Applications
Building Design and HVAC Engineering
This standard supports engineers and designers in determining optimal heating power and storage volume for domestic hot water systems during the building planning phase.Energy Performance Certification
Facilitates accurate energy need calculations that are essential for complying with energy performance standards and certifications for new or refurbished buildings.System Dimensioning for Various Buildings
Applicable to single-family homes, multi-family residential buildings, commercial buildings, and special-use facilities, ensuring tailored domestic hot water system sizing.Retrofitting and Upgrading Systems
Used as a reference for upgrading existing DHW systems to improve energy efficiency and meet updated regulatory requirements.Standardized Energy Calculation Methods
Enables consistency and comparability in energy calculations across EU member states, supporting policy implementation in the energy sector.
Related Standards
EN 12831 Series
Part 1: Calculation of the design heat load for the building – overall heating needs.
Part 2: Methodologies related to building envelopes and HVAC systems.EN ISO 52000-1
Framework for energy performance of buildings, setting out the modular approach where EN 12831-3 fits as a dedicated module for DHW systems.CEN ISO/TR 52000-2
Provides tables and relationships of EPB modules, linking EN 12831-3 with other relevant standards and technical reports.Other Heating System Standards
Including standards addressing heat generators, heat exchangers, and water storage equipment relevant for domestic hot water preparation.
By adopting SIST EN 12831-3:2018/oprA1:2021, building professionals, energy consultants, and manufacturers gain access to a reliable, harmonized calculation model for domestic hot water heat loads. This enhances energy efficiency in building design and operation, directly supporting sustainable building practices and regulatory compliance across Europe.
Frequently Asked Questions
SIST EN 12831-3:2018/oprA1:2021 is a draft published by the Slovenian Institute for Standardization (SIST). Its full title is "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". This standard covers: This European Standard describes a method to calculate the power and the storage volume required for the dimensioning of domestic hot water systems (DHW). The applicability ranges from direct water heaters (no storage volume and a comparatively large effective heating power) to larger storage systems with a comparatively small heating power and large storage volumes. This European Standard is applicable to the following water storage systems: - storage systems characterized by a minimal mixing zone, (such as stratified charging storage tanks or storage tanks with external heat exchangers): these systems are nominated in this standard as "charging storage systems"; - storage tank water heaters and warm water storage tanks with a pronounced mixing zone (such as DHW storage tanks with internal heat exchangers), nominated in this standard as "mixed storage systems"; and for different uses. The Scope also includes standardization methods for determining the energy need for domestic hot water. This European Standard covers the domestic hot water needs in buildings. The calculation of the energy needs for DHW-Systems applies to residential and non-residential buildings, a building or a zone of a building. Figure 1 shows the relative position of this standard within the set of EPB standards in the context of the modular structure as set out in EN ISO 52000-1. NOTE 1 In CEN ISO/TR 52000-2 the same table can be found, with, for each module, the numbers of the relevant EPB standards and accompanying technical reports that are published or in preparation. NOTE 2 The modules represent EPB standards, although one EPB standard may cover more than one module and one module may be covered by more than one EPB standard, for instance a simplified and a detailed method respectively. See also Clause 2 and Tables A.1 and B.1. Table 1 shows the relative position of this standard within the EPB package of standards. (...)
This European Standard describes a method to calculate the power and the storage volume required for the dimensioning of domestic hot water systems (DHW). The applicability ranges from direct water heaters (no storage volume and a comparatively large effective heating power) to larger storage systems with a comparatively small heating power and large storage volumes. This European Standard is applicable to the following water storage systems: - storage systems characterized by a minimal mixing zone, (such as stratified charging storage tanks or storage tanks with external heat exchangers): these systems are nominated in this standard as "charging storage systems"; - storage tank water heaters and warm water storage tanks with a pronounced mixing zone (such as DHW storage tanks with internal heat exchangers), nominated in this standard as "mixed storage systems"; and for different uses. The Scope also includes standardization methods for determining the energy need for domestic hot water. This European Standard covers the domestic hot water needs in buildings. The calculation of the energy needs for DHW-Systems applies to residential and non-residential buildings, a building or a zone of a building. Figure 1 shows the relative position of this standard within the set of EPB standards in the context of the modular structure as set out in EN ISO 52000-1. NOTE 1 In CEN ISO/TR 52000-2 the same table can be found, with, for each module, the numbers of the relevant EPB standards and accompanying technical reports that are published or in preparation. NOTE 2 The modules represent EPB standards, although one EPB standard may cover more than one module and one module may be covered by more than one EPB standard, for instance a simplified and a detailed method respectively. See also Clause 2 and Tables A.1 and B.1. Table 1 shows the relative position of this standard within the EPB package of standards. (...)
SIST EN 12831-3:2018/oprA1:2021 is classified under the following ICS (International Classification for Standards) categories: 91.140.10 - Central heating systems; 91.140.65 - Water heating equipment. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 12831-3:2018/oprA1:2021 has the following relationships with other standards: It is inter standard links to SIST EN 12831-3:2018. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 12831-3:2018/oprA1:2021 is associated with the following European legislation: EU Directives/Regulations: 2010/31/EU; Standardization Mandates: M/480. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
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Standards Content (Sample)
SLOVENSKI STANDARD
01-april-2021
Energijske lastnosti stavb - Metoda za izračun projektnih toplotnih obremenitev -
3. del: Sistemi za pripravo tople sanitarne vode, toplotna obremenitev in
opredelitev potreb - Modula M8-2 in M8-3 - Dopolnilo A1
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-
Energetische Bewertung von Gebäuden - Verfahren zur Berechnung der Norm-Heizlast -
Teil 3: Trinkwassererwärmungsanlagen, Heizlast und Bedarfsbestimmung, Module M8-2,
M8-3
Performance énergétique des bâtiments - Méthode de calcul de la charge thermique
nominale - Partie 3: Charge thermique des systèmes de production d'eau chaude
sanitaire et caractérisation des besoins, Module M8-2, M8-3
Ta slovenski standard je istoveten z: EN 12831-3:2017/prA1
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.
DRAFT
EUROPEAN STANDARD
EN 12831-3:2017
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
March 2021
ICS 91.140.10; 91.140.65
English Version
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
Performance énergétique des bâtiments - Méthode de Energetische Bewertung von Gebäuden - Verfahren zur
calcul de la charge thermique nominale - Partie 3: Berechnung der Norm-Heizlast - Teil 3:
Charge thermique des systèmes de production d'eau Trinkwassererwärmungsanlagen, Heizlast und
chaude sanitaire et caractérisation des besoins, Module Bedarfsbestimmung, Module M8-2, M8-3
M8-2, M8-3
This draft amendment is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 228.
This draft amendment A1, if approved, will modify the European Standard EN 12831-3:2017. If this draft becomes an
amendment, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for
inclusion of this amendment into the relevant national standard without any alteration.
This draft amendment was established by CEN 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.
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.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMM
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