BS EN 14277:2006 – Ventilation for buildings — Air terminal devices — Method for airflow measurement by calibrated sensors in or close to ATD/plenum boxes
1 Scope
This European Standard specifies methods for the laboratory aerodynamic testing and rating of the air flow rate measurement accuracy of fixed air flow rate measurement devices, including supply and exhaust air terminal devices (ATD) and in-duct measurement stations (IMS) and the sensitivity of such devices to flow disturbance. A general overview of different test configurations is shown in Figure 1 .
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 1 2238, Ventilation for buildings — Air terminal devices — Aerodynamic testing and rating for mixed flow application
EN 1 2792:2003, Ventilation for buildings — Symbols, terminology and graphical symbols
EN ISO 51 67-1 , Measurement of fluid flow by means of pressure differential devices inserted in circular crosssection conduits running full — Part 1: General principles and requirements (ISO 5167-1:2003)
EN ISO 51 67-2, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 2: Orifice plates (ISO 5167-2:2003)
EN ISO 51 67-3, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 3: Nozzles and Venturi nozzles (ISO 5167-3:2003)
EN ISO 51 67-4, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 4: Venturi tubes (ISO 5167-4:2003)
ISO 5221 , Air distribution and air diffusion — Rules to methods of measuring air flow rate in an air-handling duct
3 Terms, definitions and symbols
3.1 Terms and definitions For the purposes of this document, the terms and definitions given in EN 1 2792:2003 and the following apply.
3.1.1 air terminal device [ATD] component of an installation which is designed for the purpose of achieving the predetermined movement of air into or from a treated space
3.1.2 in-duct measurement station [IMS] measurement device installed in the ductwork between two pieces of duct
3.1.3 characteristic length definitive dimension referring to the diameter of a circular duct or to the dimensions L c1 or L c2 of a rectangular duct (see Figures 2 and 3)
3.1.4 5 % calibration length [L 5 ] distance from the device under test in a disturbed situation, within which the measurement error stays within 5 % compared to the calibration curve. This length [L 5 ] depends on the type of the disturbance and is specified as a function of the characteristic length for all designated types of disturbances defined for each consecutive case
BS EN 14277:2006 – Ventilation for buildings — Air terminal devices — Method for airflow measurement by calibrated sensors in or close to ATD/plenum boxes