oSIST prEN 15726:2008

SLOVENSKI STANDARD
01-januar-2008
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Ventilation for buildings - Air Diffusion - Measurements in the occupied zone of
airconditioned/ventilated rooms to evaluate thermal and acoustic conditions
Lüftung von Gebäuden — Luftverteilung — Messungen im Aufenthaltsbereich von
klimatisierten/belüfteten Räumen zur Bewertung der thermischen und akustischen
Bedingungen
Systemes de ventilation pour les bâtiments - Diffusion d'air - Mesurages dans la zone
d'occupation des pieces avec conditionnement d'air ou ventilées afin d'évaluer les
conditions thermiques et acoustiques
Ta slovenski standard je istoveten z: prEN 15726
ICS:
91.140.30
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
DRAFT
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2007
ICS 91.140.30
English Version
Ventilation for buildings - Air Diffusion - Measurements in the
occupied zone of airconditioned/ventilated rooms to evaluate
thermal and acoustic conditions
Systèmes de ventilation pour les bâtiments - Diffusion d'air
- Mesurages dans la zone d'occupation des pièces avec
conditionnement d'air ou ventilées afin d'évaluer les
conditions thermiques et acoustiques
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 156.
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 CEN Management Centre has the
same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland 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 COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 15726:2007: E
worldwide for CEN national Members.

Contents Page
Foreword. 3
1 Scope. 4
2 Normative references . 4
3 Terms and definitions. 4
4 Test set up and conditions. 5
4.1 Thermal loads. 5
4.2 Furniture . 5
4.3 Other conditions . 5
5 Methodology. 6
5.1 Sampling . 6
5.1.1 Sampling in a room. 6
5.2 Measurements . 6
5.2.1 Airflow rate . 6
5.2.2 Velocities in the occupied zone. 7
5.2.3 Temperature measurements. 9
5.2.4 Sound pressure level. 9
6 Test report . 10
Annex A (normative) Operational and environmental conditions. 11
Annex B (informative) Typical Flow Pattern . 12
Annex C (informative) Intermittence and draught risk . 14
Annex D (informative) Estimation of Air velocities in the occupied zone for different types
of jets. 17
Annex E (informative) Ventilation Efficiency Measurement. 18
Annex F (informative) Bibliography. 19

Foreword
This document (prEN 15726:2007) has been prepared by Technical Committee CEN/TC 156
“Ventilation for buildings”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
Annex A is normative and others are informative.

1 Scope
This European Standard is applicable to measure some parameters of thermal and acoustic comfort
(i.e. temperatures, air velocities…) in a room with an air diffusion system.
This European Standard can be used on site or in a lab for full-scale measurements.
This European Standard applies to ventilation or air conditioning systems designed to maintain the
comfort conditions in buildings. It is not applicable in the case of systems for the control of industrial or
other special process environments.
NOTE In the latter case however, it may be referred to if the system technology is similar to that of the
above mentioned ventilation and air conditioning systems.
2 Normative references
This European Standard document incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard document only when incorporated in it by
amendment or revision. For undated references the latest edition of the publication referred to
applies.
EN 12792, Ventilation for buildings — symbols and terminology
CR XXXX, Ventilation for buildings — method for measuring airflow rates in ventilation systems
ISO 5167, Measurements of fluid flow by means of pressure differential devices
ISO 7726, Ergonomics of the thermal environment — Instruments and methods for measuring
physical quantities
EN 12599, Test procedures and measuring methods for handing over installed ventilation and air
conditioning systems
EN 13779, Ventilation for non residential buildings — Performance requirements for ventilation and
room-conditioning systems
EN 13182 Instrumentation requirements for air velocity measurements in ventilated spaces
EN 15251, Ventilation for buildings- Indoor environmental input parameters for design and
assessment of energy performance of buildings addressing indoor air quality, thermal environment,
lighting and acoustics
ISO 7730, Ergonomics of the thermal environment-Analytical determination and interpretation of
thermal comfort using calculation of the PMV and PPD indices and the local comfort criteria
3 Terms and definitions
For the purposes of this European Standard, the following terms and definitions apply:
3.1
reference point
the point where the measurements are taken
3.2
mean velocity
at a point, mean velocity is the time average velocity over the measuring period
3.3
spatial Average (or residual) velocity
it is the average value of mean velocities taken in several points in the occupied zone
3.4
spatial Maximum velocity
it is the maximum value of mean velocities taken in several points in the occupied zone
3.5
test area
is equal to the occupied zone according EN 13779
4 Test set up and conditions
Before any test, the air diffusion system shall be checked accordance with EN 12599 so that its
performance may be recorded.
If the system performance does not meet the design criteria correction shall be considered prior the
continuation of the test. If this is not possible this shall be made clear in the report along with the
assumptions made.
4.1 Thermal loads
The room should be occupied according to its expected use or thermal loads have to be simulated.
This should include all internal and external loads (occupants, lights, equipment…). For on site
measurements internal and external loads should be reported. (actual or simulated).
4.2 Furniture
Furniture, curtains, absorbent surfaces, etc. can influence thermal or acoustic characteristics and
should therefore be as representative as possible.
4.3 Other conditions
Operational conditions of system running (VAV, fan speed, variable geometry…) and environmental
conditions do have influence on results and have to be reported according to Annex A.
Conditions must be stabilised as much as possible during the test. For instance, supply temperature
and reference point temperature should be checked regularly and should not vary during the test by
more than +/- 1 K If this is not possible then the variation shall be recorded.
5 Methodology
5.1 Sampling
5.1.1 Sampling in a room
The reference point will be situated in the centre of the test area at a height of 1.1 m. Large areas
may be divided in smaller parts, usually recommended to be less than 20 m (EN 12599). In this case,
each smaller part shall be treated as a test area
There should be enough area to ensure a correct representation of the overall and local air diffusion.
It is recommended that the test area takes into account several diffusers jets in order to cover the
effect of jet interaction.
5.2 Measurements
Different levels of measurements can be used:
 Level 1: easy and quick check at the reference point(s).
 Level 2: more detailed check. Level 1 tests have to be performed first.
For each level, required measurements are indicated in Table 1.
Table 1 — Measurements required

Level 1 Level 2
Airflow rate Smoke test or any other jet Measurement (§ 5.2.1.2)
visualisation (§ 5.2.1.1)
Velocities Measurement (§ 5.2.2.2)
Temperatures At reference point (§ 5.2.3.1) Measurement (§ 5.2.3.2)

Sound pressure level Overall dBA level at the reference Octave band in order to recalculate
point, or any other point where any criteria (dB(A), dB(C), NR…)
the highest sound level can be asked (§ 5.2.4.2)
expected. (§ 5.2.4.1)
If required
Ventilation Efficiency  see Annex E

5.2.1 Airflow rate
5.2.1.1 Level 1: Jet visualisation
Jet shall be visualised either by smoke test or by any other means
The objective of the visualisation is:
 to determine the air flow pattern in the occupied zone;
 to detect possible high velocity areas;
 to detect possible dead zones;
 Examples of common flow patterns are given in Annex B.
5.2.1.2 Level 2: Airflow rate measurements
Any method described either in CR XXXX,EN 12599 , or ISO 516
...