EN 12589:2001

SLOVENSKI STANDARD
01-december-2001
3UH]UDþHYDQMHVWDYE1DSUDYH]DUD]YRG]UDND$HURGLQDPLþQRSUHVNXãDQMHLQ
RFHQLWHYHQRW]DNRQVWDQWQRLQVSUHPHQOMLYRNROLþLQR]UDND
Ventilation for buildings - Air terminal units - Aerodynamic testing and rating of constant
and variable rate terminal units
Lüftung von Gebäuden - Luftdurchlasseinheiten - Aerodynamische Prüfung und
Bewertung von Luftdurchlasseinheiten mit konstantem und variablem Luftvolumenstrom
Ventilation des bâtiments - Unités terminales - Essais aérodynamiques et évaluation des
unités terminales a débit constant et variable
Ta slovenski standard je istoveten z: EN 12589:2001
ICS:
91.140.30 3UH]UDþHYDOQLLQNOLPDWVNL Ventilation and air-
VLVWHPL conditioning
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 12589
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2001
ICS 91.140.30
English version
Ventilation for buildings - Air terminal units - Aerodynamic testing
and rating of constant and variable rate terminal units
Ventilation des bâtiments - Unités terminales - Essais Lüftung von Gebäuden - Luftdurchlasseinheiten -
aérodynamiques et évaluation des unités terminales à débit Aerodynamische Prüfung und Bewertung von
constant et variable Luftdurchlasseinheiten mit konstantem und variablem
Luftvolumenstrom
This European Standard was approved by CEN on 18 August 2001.
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 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 Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2001 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12589:2001 E
worldwide for CEN national Members.

Contents
PAGE
FOREWORD. 3
1 SCOPE. 4
2 NORMATIVE REFERENCES . 4
3 TERMS, DEFINITIONS AND SYMBOLS. 6
4 INSTRUMENTATION. 7
5 TESTS FOR FLOW RATE CONTROL CHARACTERISTICS . 8
6 TESTS TO DETERMINE INDUCED AIR FLOW RATE . 20
7 TEST TO DETERMINE TEMPERATURE MIXING . 22
8 TESTS TO DETERMINE LEAKAGE RATES . 27
ANNEX A (NORMATIVE) DETERMINATION OF STATIC PRESSURE . 32
Foreword
This European Standard has been prepared by Technical Committee CEN/TC 156 "Ventilation for
buildings", the secretariat of which is held by BSI.
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 March 2002, and conflicting national standards shall
be withdrawn at the latest by March 2002.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Czech
Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg,
Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.
1 Scope
This European Standard specifies methods for the aerodynamic testing and rating of constant and
variable flow rate terminal units suitable for use with air distribution systems.
The terminal units considered are:
- Single and dual duct.
- Induction.
- Fan assisted induction (parallel and series).
- Single duct with integral diffuser.
The tests for each type of unit are summarized in Figure 1.
The tests in this standard are designed to determine fully the aerodynamic performance of terminal units
and provide a basis for the comparison of the suitability of such assemblies when correctly installed in an
air distribution system.
2 Normative references
This European Standard incorporated 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 the subsequent amendments to or revisions of any of these publications
apply to this European Standard only when incorporated in it by amendment or revision. For undated
references the latest edition of the publication referred to applies (including amendments).
CR 12792 Ventilation for buildings - Symbols, units and terminology
ISO 5167-1 Measurement of fluid flow by means of pressure differential devices -
Part 1 : Orifice plates, nozzles and venturic tubes inserted in circular cross-section
conduits running full
ISO 3966 Measurement of fluid flow in closed conduits – Velocity area method using Pitot static
tubes
ISO 5221 Air distribution and air diffusion - Rules to methods of measuring air flow rate in an air
handling duct
Single duct Dual duct Induction Fan assisted Fan assisted Terminal with
Induction Induction integral diffuser
Terminal Terminal
Series type Parallel type
SD DD IU IFS IFP TD
Flow rate control characteristic INDUCED FLOW RATE
All units
Press. Compensation
5.3 5.4
Influence inlet cond.
min. Operat. Press
All units
Unit SD, DD
Unit IU, IFS, IFP
Unit TD
78Temperature mixing Leakage rates
All units
8.3 8.5
Damper Casing
All units All units
Figure 1 - Test units and test requirements
3 Terms, definitions and symbols
3.1 For the purposes of this standard, the terms and definitions given in CR 12792 apply.
3.2 The symbols and the suffixes used in this standard are shown in Tables 1 and 2
respectively.
Table 1 - Symbols used for testing air terminal units
Symbol Quantity Units
A Internal cross-sectional area of duct m
c
d m
e
Equivalent diameter 4A /

c
p Absolute static pressure Pa
p Atmospheric pressure Pa
a
p Velocity pressure Pa
d
p Stagnation (or absolute total pressure) Pa
r
p Static gauge pressure (p - p)Pa
s a
p Total pressure (p - p)Pa
t r a

 Flow meter pressure difference Pa

 Total pressure difference Pa
t
3 -1 -1
q Volume rate of air flow at the flow meter m .s or l.s
v
3 -1 -1
q Leakage volume rate of air flow m .s or l.s
vL
3 -1 -2
Q Leakage volume rate of air flow across a m .s .m
vLBA
valve per unit cross-sectional area
-1 -2
or l.s .m
3 -1 -2
Q Leakage volume rate of air flow through m .s .m
vLCA
casing per unit cross-sectional area
-1 -2
or l.s .m
-1
v Velocity m.s
-3
 Air density kg.m
 Celsius temperature
C
S Position of valve or induction damper setting

n Fan speed control setting V or position
Table 2 - Suffixes used with the symbols in Table 1
0 recommended value (usually by the manufacturer)
1 inlet of the unit under test
2 outlet of the unit under test
3 induction port(s) of the unit under test
i outlet air temperature
c cold side of the unit under test
w warm side of the unit under test
u measuring point upstream of the flow meter
D measuring point upstream of the discharge flow meter
sn nett surface area of the unit under test
ca casing of the unit under test
va valve of the unit under test
4 Instrumentation
4.1 Air flow rate measurement
4.1.1 The air flow rate shall be measured using instruments in accordance with ISO 5167-1.
4.1.2 Air flow meters shall have the ranges and accuracies shown in Table 3.
Table 3 Ranges and accuracies of air flow meters

Range Measurement error
3 -1
m s %
± 5
> 0,007  0,07
± 2,5
> 0,07  7,00
NOTE Flow meters may be calibrated in situ by means of pitot static tube traverse techniques described in
ISO 3966.
4.1.3 Leakage air flow meters shall have the ranges and accuracies shown in Table 4.
Table 4  Ranges and accuracies of leakage air flow meters
Range Measurement error
3 -1
%
m s
-3 3 -1
0,9 x 10 m .s
 0,018
± 5 %
> 0.018
NOTE Alternatively, other devices such as variable-area, flow-rate meters or integrating air flow meters of the
positive displacement type may be used if calibrated in accordance with 4.1.3.
4.1.4 Flow meters shall be checked at intervals, as appropriate, but not exceeding 12 months. This
check may take the form of one of the following:
a) a dimensional check for all flow meters not requiring calibration;
b) a check calibration over their full range using the original method employed for initial calibration
or meters calibrated in situ;
c) a check against a flow meter which meets the flow meter specification in accordance with
ISO 5221.
4.2 Pressure measurement
4.2.1 Pressure in the duct shall be measured by means of a liquid-filled calibrated manometer, or
any other device conforming to 4.2.2.
4.2.2 The maximum scale or display interval shall not be greater than the characteristics listed for
the accompanying range of manometers, shown in Table 5.
Table 5  Maximum scale or display interval
Range Maximum scale interval
Pa Pa
1,0
 25
2,5
> 25 to 250
5,0
> 250 to 500
25,0
> 500
4.2.3 For air flow rate measurements, the minimum pressure differential shall be:
a) 25 Pa with an inclined tube manometer or micro-manometer;
b) 500 Pa with a vertical tube manometer.
4.2.4 The calibration standards shall be:
a) for instruments with the range up to 25 Pa, a micro-manometer accurate to ± 0,5 Pa;
b) for instruments with the range of 25 Pa to 500 Pa, a manometer accurate to ± 2,6 Pa (hook
gauge or micro-manometer);
c) for instruments with the range of 500 Pa and upwards, a manometer accurate to ± 25 Pa
(vertical manometer).
4.3 Temperature measurement
Measurement of temperature shall be by means of mercury-in-glass thermometers, resistance
thermometers or thermo-couples. Instruments shall be graduated to give readings in intervals not greater
than 0,5 K and calibrated to an accuracy of ± 0,25 K.
5 Tests for flow rate control characteristics
5.1 Principle
To determine the changes in primary air flow rate resulting either from variations in the pressure
differential between the inlet duct(s) and the outlet duct(s) or chamber or upstream pressure whichever is
appropriate.
Also, to determine the pressure differential between upstream and downstream of the terminal unit, and
additionally the minimum pressure difference which is necessary to reach the performance of the terminal
unit within the specified operating tolerances (minimum operating pressure difference).
5.2 Test measurements
The following parameters shall be measured during the tests:
a) p inlet duct static gauge pressure.
s1
b) p static gauge pressure in the chamber into which the outlet duct discharges
s2
(p = 0 if free outlet conditions are used).
s2
c)  air temperature at the inlet to the unit under test.
d)  p the flow meter pressure difference (or the appropriate parameter that relates
to the air flow q ).
v1
e) p the static gauge pressure immediately upstream of the flow meter.
su
f)  the air temperature immediately upstream of the flow meter.
u
g) p the atmospheric pressure at the beginning and end of the tests.
a
5.3


   


p )
tmin
5.3.1 Units without induction SD, DD
NOTE This test is required for pressure independent units only.
5.3.1.1 Test installation
A typical test installation for type SD units is shown in Figure 2.
Performance of static pressure measurement device is described in annex A.
A typical test installation for type DD units is shown in Figure 3. All the test equipment described in clause
4 should be installed for both supply ducts. Discharge temperature measurement equipment should be
installed if mixing efficiency is to be determined.
5.3.1.2 Test procedure
5.3.1.2.1 With the supply fan running, set the flow rate controller to its maximum setting. Increase the
pressure differential between the inlet(s) and the outlet(s) to the manufacturers recommended maximum
operating pressure differential and record the test measurements in accordance with 5.2.
5.3.1.2.2 Decrease the pressure differential in stages, approximately to the values given in Table 6
until the flow rate has reached a value equal to or less than 50 % of the value obtained in the
pressure differential range where the flow rate is seen to be approximately constant. At each stage
record the test measurements in accordance with 5.2.
When making the adjustments to pressure, if the pressure falls below the next prescribed value,
increase it to the value at the start of the test, and then slowly decrease it to the specified value before
a further measurement is taken.
Q
D
Q
3 d
d
e1
e2
1,5 d
e1
1 t t
u
Key
1 Air flow 5 Total length of unit
2 Flow rate measuring device which conforms to ISO 5167-1 6 Unit under test
3 Flow straughtener which conforms to ISO 5167-1 7 Chamber such as reverberation room
4 This length to be straight and its cross section uniform and equal to that of the inlet spigot 8 Peizometric ring
NOTE Dual duct unit: Each duct to be measured seperatel
...