DIN EN 12238:2001-12

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

This standard is included in DIN Handbook 217-3. Defines methods for the laboratory aerodynamic testing and rating of air terminal devices for mixed flow applications, including the specification of suitable test facilities and measurement techniques.