oSIST prEN 15203:2005

SLOVENSKI oSIST prEN 15203:2005

PREDSTANDARD
maj 2005
Energijske karakteristike stavb – Ugotavljanje porabe energije in definicije
ocenitev
Energy performance of buildings - Assessment of energy use and definition of
ratings
ICS 91.120.10 Referenčna številka
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

EUROPEAN STANDARD
DRAFT
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2005
ICS
English version
Energy performance of buildings - Assessment of energy use
and definition of ratings
Performance énergétique des bâtiments - Evaluation de Energetische Verhalten von Gebäuden - Evaluierung des
l'énergie utilisée et définition des indices de performance Energieverbrauchs von Gebäuden und Definition der
Leistungsindikatoren
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 89.
If this draft becomes a European Standard, 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.
This draft European Standard 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 Management Centre has the same
status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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 COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 15203:2005: E
worldwide for CEN national Members.

Contents Page
Foreword.3
Introduction .4
1 Scope .5
2 Normative references .5
3 Terms and definitions .7
4 Symbols and abbreviations .9
5 Assessment of energy use of buildings.10
6 Delivered energy, primary energy, emissions and energy costs .14
7 Calculated rating.17
8 Operational rating.19
9 Validated building calculation model .22
10 Planning of retrofit measures for existing buildings .25
11 Report .26
Annex A (normative) Methods for collecting building data.28
Annex B (normative) Assessing the used amounts of energyware .31
Annex C (informative) Conventional input data related to occupancy.33
Annex D (informative) Confidence intervals.35
Annex E (informative) Other uses of energy .38
Annex F (informative) Calorific values of fuels .39
Annex G (informative)  Energy monitoring .42
Annex H (informative)  List of possible measures for reducing energy use.45

Foreword
This document (prEN 15203:2005) has been prepared by Technical Committee CEN/TC 89 “Thermal
performance of buildings and building components”, the secretariat of which is held by SIS.
This document is currently submitted to the CEN Enquiry.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
Introduction
Energy assessments of buildings are carried out for various purposes, such as:
a) Judging compliance with building regulations expressed in terms of a limitation on energy use or a related
quantity;
b) Transparency in commercial operations through the certification and/or display of a level of energy
performance (energy certification);
c) Monitoring of the energy efficiency of the building including heating, ventilation and air conditioning
systems
d) Helping in planning retrofit measures, through prediction of energy savings which would result from
various actions.
Energy certification of buildings requires a method that is applicable to both new and existing buildings, and
which treats them in an equivalent way. Therefore, a methodology to obtain equivalent results from different
sets of data is presented in this standard. A methodology to assess missing data and to calculate a "standard"
energy use for space heating and cooling, ventilation, domestic hot water and lighting is provided. This
standard also includes a methodology that allows assessment of the energy effectiveness of possible
improvements.
Two principal types of ratings for buildings are proposed in this standard:
1) The asset rating is obtained by calculation for standardised conditions, but there can be different
ways of assembling the input data – from drawings and design values for new buildings, from
drawings, site surveys and rules derived from building typology for existing buildings, and by
improving on the latter by making use of metered energy.
2) The operational rating is obtained by metering and summing up all delivered energywares.
Because of the differences in the way these two ratings are obtained, they cannot be compared directly.
However, the difference between the two ratings for the same building can be used to assess the cumulative
effects of actual construction, systems and operating conditions versus standard ones and the contribution of
energy uses not included in the asset rating.
1 Scope
This standard defines the uses of energy to be taken into account for setting energy performance ratings for
new and existing buildings, and provides:
a) A method to compute the asset rating, a standard energy use that does not depend on occupant
behaviour, actual weather and other actual (environment or input) conditions. For this, occupancy, climate
and some other data that do not depend on the building itself are conventional ones, depending on the
intended use of the building and on the climatic zone considered.
b) A method to assess the operational rating, based on the delivered energy.
c) A methodology to improve confidence in the building calculation model by comparison with actual energy
consumption.
d) A method to assess the energy effectiveness of possible improvements.
It is up to national bodies to define under which conditions and for which types of buildings the various ratings
apply.
2 Normative references
The following referenced documents are indispensable for the application 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.
EN 410, Glass in building – Determination of luminous and solar characteristics of glazing
EN 673, Glass in building – Determination of thermal transmittance (U value) – Calculation method
EN 12412-2, Thermal performance of windows, doors and shutters – Determination of thermal transmittance
by hot box method – Part 2: Frames
EN 13187, Thermal performance of buildings – Qualitative detection of thermal irregularities in building
envelopes – Infrared method
prEN wi 1+3, Energy performance of buildings — Methods for expressing energy performance and for energy
certification of buildings
prEN wi 2, Energy performance of buildings — Overall energy use, primary energy and CO emissions
prEN wi 7, Heating systems in buildings – Method for calculation of system energy requirements and system
efficiencies – Part 1: General
prEN wi 8, Heating systems in buildings – Method for calculation of system energy requirements and system
efficiencies – Part 2.1: Space heating emission systems
prEN wi 9, Heating systems in buildings – Method for calculation of system energy requirements and system
efficiencies –
Part 2.2.1: Boilers
Part 2.2.2: Heat pumps
Part 2.2.3: Heating generation – Thermal solar systems
Part 2.2.4: Performance and quality of CHP
Part 2.2.5: Performance and quality of district heating and large volume systems
Part 2.2.6: Performance of other renewables (heat and electricity)
Part 2.2.7: Space heating generation – Biomass combustion systems
prEN wi 10, Heating systems in buildings - Method for calculation of system energy requirements and system
efficiencies – Part 2.3: Space heating distribution systems
prEN wi 11, Heating systems in buildings – Method for calculation of system energy requirements and system
efficiencies – Part 3.1: Domestic hot water systems, including generation efficiency and the tap water
requirements
prEN wi 12, Calculation of room temperatures and of load and energy for buildings with room conditioning
systems
prEN wi 13, Energy performance of buildings – Energy requirements for lighting — Part 1: Lighting energy
estimation
prEN wi 14, Energy performance of buildings – Calculation of energy use for space heating and cooling
prEN wi 17, Thermal performance of buildings – Calculation of energy use for space heating and cooling –
General criteria and validation procedures for detailed calculations
prEN wi 20+21, Ventilation for buildings – Calculation methods for energy requirements due to ventilation
systems in buildings
prEN wi 22, Calculation methods for energy efficiency improvements by the application of integrated building
automation systems
prEN ISO 6946:2005, Building components and building elements – Thermal resistance and thermal
transmittance – Calculation method
EN ISO 7345, Thermal insulation – Physical quantities and definitions
prEN ISO 10077-1:2004, Thermal performance of windows, doors and shutters – Calculation of thermal
transmittance – Part 1: General
EN ISO 10077-2, Thermal performance of windows, doors and shutters – Calculation of thermal transmittance
– Part 2: Numerical method for frames
prEN ISO 10211:2005, Thermal bridges in building construction – Heat flows and surface temperatures –
Detailed calculations
EN ISO 12567 (all parts), Thermal performance of windows and doors – Determination of thermal
transmittance by hot box method
EN ISO 12569, Thermal insulation in buildings – Determination of air change in buildings - Tracer gas dilution
method
EN ISO 13790, Thermal performance of buildings – Calculation of energy use for space heating
prEN ISO 14683:2005, Thermal bridges in building construction – Linear thermal transmittance – Simplified
methods and default values
1)
EN ISO 15927-4 , Hygrothermal performance of buildings – Calculation and presentation of climatic data –
Part 4: Hourly data for assessing the annual energy use for heating and cooling
prEN ISO 15927-6:2004, Hygrothermal performance of buildings – Calculation and presentation of climatic

data – Part 6: Accumulated temperature differences (degree-days)
ISO 9869, Thermal insulation – Building elements – In-situ measurement of thermal resistance and thermal
transmittance
ISO 13600, Technical energy systems – Basic concepts
ISO 13601, Technical energy systems – Structure for analysis – Energyware supply and demand sectors

1) To be published.
3 Terms and definitions
For the purposes of this European Standard, the terms and definitions given in EN ISO 7345 and the following
apply.
3.1
rating
evaluation of the energy performance of a building based on the weighted sum of the calculated or metered
use of energy carriers.
3.2
asset rating
rating based on calculations of the energy used by a building for heating, cooling, ventilation, hot water and
lighting, with standard input data related to internal and external climates and occupancy
NOTE It represents the intrinsic energy potential of a building under standardised conditions of weather and
occupancy This is particularly relevant to certification of standard performance. The asset rating represents a weighted
sum per energyware of the total energy for heating, hot water heating, cooling, ventilation and lighting. This rating
quantifies the calculated energy intensity
...