BS EN 12238:2001

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 Ps with the
                  first test installation A
          5.1.3 Direct measurement of total pressure Pt with
                  the first installation A
          5.1.4 Measurement of static pressure Ps with the first
                  installation B
          5.1.5 Presentation of total pressure Pt
    5.2 Measurement of pressure requirement for an exhaust air
    5.3 Determination of air velocity and the corresponding
          area Ak 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 Ak
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

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.

This European Standard specifies 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. The standard gives only tests for the assessment of characteristics of the air terminal devices under isothermal conditions. The testing of low velocity air terminal devices is specified in EN 12239.