EN 17888-2:2024

SLOVENSKI STANDARD
01-julij-2024
Toplotne značilnosti stavb - Preskušanje gradbenih preskusnih struktur na mestu
vgradnje - 2. del: Analiza podatkov v stanju dinamičnega ravnovesja za preskus
skupnih toplotnih izgub
Thermal performance of buildings - In situ testing of building test structures - Part 2:
Steady-state data analysis for aggregate heat loss test
Thermische Leistung von Gebäuden - In-situ-Tests von Gebäudeteststrukturen - Teil 2:
Steady-State-Datenanalyse für Gesamtwärmeverlusttest
Performance thermique des bâtiments - Mesurage in-situ de bâtiment d’essai - Partie 2 :
Analyse des données en régime permanent pour le test de perte de chaleur globale
Ta slovenski standard je istoveten z: EN 17888-2:2024
ICS:
91.120.10 Toplotna izolacija stavb Thermal insulation of
buildings
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 17888-2
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2024
EUROPÄISCHE NORM
ICS 91.120.10
English Version
Thermal performance of buildings - In situ testing of
building test structures - Part 2: Steady-state data analysis
for aggregate heat loss test
Performance thermique des bâtiments - Essais in situ Wärmetechnisches Verhalten von Gebäuden - In-situ-
des structures de bâtiments d'essai - Partie 2 : Analyse Messung an Bauwerksprüfkörpern - Teil 2:
des données en régime stationnaire pour l'essai de Auswertung stationärer Daten für die Prüfung des
déperdition thermique globale Gesamtwärmeverlustes
This European Standard was approved by CEN on 27 February 2024.

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, Türkiye 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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17888-2:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms, definitions and symbols . 5
3.1 Terms and definitions . 5
3.2 Symbols . 7
4 Principle . 9
5 Uncertainty. 9
6 Input data. 10
6.1 Raw data . 10
6.2 Irregularities and gaps in the data . 10
6.3 Cleaning data . 11
6.4 Filtering (averaging) . 11
6.5 Checking averaged data . 12
7 Data analysis . 12
7.1 General. 12
7.2 Simple linear regression using the Siviour method . 13
7.3 Multiple linear regression (MLR) techniques. 14
7.3.1 General. 14
7.4 Validation: residuals analysis . 14
7.5 Normality of residuals . 14
7.6 Autocorrelation test . 15
8 Test report . 16
8.1 General. 16
8.2 Data on the measured building/ structure . 17
8.3 Description of the experimental set-up . 17
8.4 Conditions during measurement . 17
8.5 Data pre-processing . 18
8.6 Aggregate heat transfer coefficient and associated uncertainties estimation . 18
8.7 Supplementary and supporting measurements . 19
Annex A (normative) Limitations and sources of errors . 20
Annex B (normative) Process for estimating experimental uncertainty . 24
Annex C (normative)  Data analysis methods . 30
Annex D (informative) Example of building heat loss test data analysis. 39
Annex E (informative) Practical recommendations . 49
Bibliography . 51

European foreword
This document (EN 17888-2:2024) 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 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 November 2024, and conflicting national standards shall
be withdrawn at the latest by November 2024.
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.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations 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, Türkiye and the United
Kingdom.
Introduction
EN 17888-1 describes a test methodology that enables the actual in situ building test structure aggregate
heat loss (building heat transfer coefficient) to be quantified. This test method is termed the aggregate
heat loss test method. This document principally covers numerical methods based on steady-state linear
regression techniques. The results obtained using these methods are only valid under the assumption
that, in first approximation, the data can be described by these mathematical and physical laws. Statistical
tests to check the validity of these assumptions are therefore given. It also results in the determination of
an aggregate building heat transfer coefficient for the tested building structure, along with the
uncertainty associated with this coefficient. Both the aggregate building test structure heat transfer
coefficient and its uncertainty can be calculated as an output of this document. The reporting format
relating to the test data and the resulting analysis is also described.
This document is highly linked with EN 17888-1 to which it applies exclusively. It is also complimentary
to EN 17887-1 which deals exclusively with completed buildings.
In first instance, real building co-heating tests and associated data analysis help on determining the global
performance of the building that usually take advantage of free solar gains through well oriented glazing
surfaces. In this case these solar gains are welcome and contribute in reducing the energy demand for
heating of the building. Aggregate heat loss coefficient extracted from data analysis on such real building
is then minimized by associated solar gains and may help to better understand the real energy demand
of the studied building structure regarding weather conditions.
In second instance it is from interest (as example) to concentrate on aggregate thermal performance of
opaque building structures, for more precisely undertake the analysis of the thermal response of the
building structure linked to these same climatic patterns. For that purpose, direct solar gains through
glazing surfaces are excluded of the study by testing preferatelly opaque structures. In most of the cases,
in winter periods, solar gain through opaque insulated surfaces remain poor so that the energy demand
for heating become mostly dependent on temperature difference between internal and external
environments. Nevertheless, this also offers the opportunity to undertake in situ testing with the aim to
evaluate efficiency of passive solar systems that would contribute to minimize the energy demand of the
tested building structure.
This document describes the input data required to undertake the analysis, various statistical methods
that can be used to analyse the data, the uncertainty associated with the measurements, and the reporting
format.
Detailed requirements concerning the test procedure and the data recording are specified in EN 17888-1.
1 Scope
This document specifies the steady-state data analysis methods to evaluate the data from ‘the aggregate
heat loss test method’. These analysis methods enable the actual in situ aggregate heat loss (building heat
transfer coefficient) to be estimated.
NOTE The aggregate heat loss method is specified in EN 17888-1:2024.
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 5479, Statistical interpretation of data — Tests for departure from the normal distribution
EN 17888-1:2024, Thermal performance of buildings — In situ testing of building test structure — Part 1:
Data collection for aggregate heat loss test
3 Terms, definitions and symbols
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1 Terms and definitions
3.1.1
aggregate heat transfer coefficient
sum of the transmission and infiltration component of the ventilation heat transfer coefficient based upon
measurement according to this test standard
3.1.2
external (internal) air temperature
temperature of the external (internal) air measured by external (int
...