DIN EN 12238:2001-12
Current
The latest, up-to-date edition.
VENTILATION FOR BUILDINGS - AIR TERMINAL DEVICES - AERODYNAMIC TESTING AND RATING FOR MIXED FLOW APPLICATION
Hardcopy , PDF
German, English
01-01-2001
Foreword
1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Functional characteristics of air terminal devices
3.2 Symbols
4 Instrumentation
4.1 Airflow rate measurement
4.2 Pressure measurement
4.3 Temperature measurements
4.4 Velocity measurements
5 Testing of pressure and air velocity (first test
installation)
5.1 Measurement of pressure requirement for a supply
air terminal device
5.1.1 General
5.1.2 Measurement of static gauge pressure P[s]
with the first test installation A
5.1.3 Direct measurement of total pressure P[t]
with the first installation A
5.1.4 Measurement of static pressure P[s] with
the first installation B
5.1.5 Presentation of total pressure P[t]
5.2 Measurement of pressure requirement for an exhaust
air terminal device
5.2.1 Procedure
5.2.2 Measurement of static pressure with the first
test installation C for exhaust air terminal
device (excluding air transfer devices)
5.2.3 Direct measurement of total pressure with the
first installation C, for exhaust air terminal
device
5.2.4 Measurement of static pressure with the first
test installation D for exhaust air terminal
device
5.2.5 Presentation of total pressure P[t]
5.3 Determination of air velocity V[k] and the corresponding
area A[k] for the air terminal device (not mandatory)
5.3.1 Principle
5.3.2 Test installation
5.3.3 Test procedure
5.3.4 Correction of flow rates to standard air conditions
5.3.5 Calculation of A[k]
6 Test to measure the isothermal air discharge characteristics
of a supply air terminal device (second test installation)
6.1 Test measurements
6.2 Test room
6.3 Test room equipment and instrumentation
6.4 Installation of the air thermal device
6.4.1 Classification of air terminal devices
6.4.2 Mounting of air terminal devices
6.4.3 Test duct and flow rate
6.5 Test procedure
6.6 Determination of isothermal performance
6.6.1 Test measurements
6.6.2 Determination of the main air stream direction
6.6.3 Measurement of air stream velocities
6.6.4 Determination of throw
6.6.5 Determination of spread
6.6.6 Determination of rise and drop
Annex A (normative) Alternative exploratory technique for
determination of throw, spread and drop
A.1 Scope
A.2 Determination of the point of maximum velocity
A.3 Determination of points at envelope velocity
A.4 Determination of spread
A.5 Determination of the rise and drop
A.6 Number of determinations
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