BS EN 1751:2024

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Ventilation for buildings. Air terminal devices. Aerodynamic testing of damper and valves

Published By	Publication Date	Number of Pages
BSI	2024	34

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Categories: 91.140.30 - Ventilation and air-conditioning systems, BSI

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Description

This document specifies methods for the testing and rating of dampers and valves used in air distribution systems with pressure differences up to 2 000 Pa. The tests incorporated in this document will address: – leakage past a closed damper or valve (for classification, see Annex C); – casing leakage (for classification, see Annex C); – flow rate/pressure requirement characteristics; – torque: (see Annex A); – thermal transmittance: (see Annex B). The tests specified above are applicable to the following: – measurement of leakage past a closed damper or valve; – measurement of casing leakage; – determination of flow rate and pressure requirements; – measurement of torque characteristics (see Annex A); – measurement of thermal transfer characteristics to determine insulation properties (see Annex B). This document does not apply to the acoustic testing of dampers and valves. NOTE Certain aspects of the dynamic performance of dampers and/or valves are dependent upon the air distribution system to which they are connected and are, therefore, difficult to measure in isolation. Such considerations have led to the omission of these aspects of the dynamic performance measurements from this document. Also, in common with other air distribution components, the results from tests carried out in accordance with this document might not be directly applicable if the damper or valve is situated in an area of non-uniform flow.

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PDF Pages	PDF Title
2	undefined
6	1 Scope 2 Normative references
7	3 Terms, definitions, symbols and suffixes 3.1 Terms and definitions 3.2 Symbols
8	3.3 Suffixes 4 Instrumentation 4.1 Air flow rate measurement
9	4.2 Pressure measurement 4.3 Temperature measurement
10	5 Leakage tests 5.1 General 5.2 Damper and valve leakage 5.3 Casing leakage
11	6 Flow rate and pressure tests 6.1 Ducted method
12	6.2 Chamber method 6.2.1 General 6.2.2 Size relationship 6.2.3 Tests
13	6.3 Calculations and report
20	Annex A (informative)Mechanical testing of dampers and valves A.1 General A.2 Instrumentation: Torque measurement A.3 Pressure test to determine limiting value for structural stability
21	A.4 Torque tests to determine the torque required to operate the damper or valve and the limiting value to avoid structural damage A.4.1 Torque required to operate damper A.4.2 Maximum permitted torque
23	Annex B (informative)Thermal transmittance through dampers and valves B.1 General B.2 Thermal loss test using a substitution method
26	Annex C (normative)Classification of a damper or valve leakage C.1 General C.2 Leakage through closed blade(s)
28	C.3 Casing leakage
30	Annex D (informative)Effect of duct configuration on pressure loss coefficient D.1 General
31	D.2 Application of correction factor

Additional information

Status	Definitive
Pages	34
Publication Date	2024-05-30
ISBN	978 0 539 21308 9
Standard Number	BS EN 1751:2024
Title	Ventilation for buildings. Air terminal devices. Aerodynamic testing of damper and valves
Identical National Standard Of	EN 1751
Replaces	BS EN 1751:2014
Descriptors	Ventilation equipment, Ventilation, Dampers (air conditioning), Pressure measurement (fluids), Test equipment, Air terminal devices, Accuracy, Testing conditions, Thermal transmittance, Flow rates, Thermal testing, Mathematical calculations, Grades (quality), Mechanical testing, Pressure testing, Leak tests, Aerodynamic characteristics, Air-conditioning equipment, Air-distribution systems, Valves, Torque, Flow measurement
Publisher	BSI
Committee	RHE/2
ICS Codes	91.140.30 - Ventilation and air-conditioning systems

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