ISO 9972-2015 pdf free.Thermal performance of buildings – Determination of air permeability of buildings 一 Fan pressurization method.
ISO 9972 is intended for the measurement of the air permeability of buildings or parts of buildings in the field. It specifies the use of mechanical pressurization or depressurization of a building or part of a building. It describes the measurement of the resulting air flow rates over a range of indoor-outdoor static pressure differences.
This International Standard is intended for the measurement of the air leakage of building envelopes of single-zone buildings. For the purpose of this International Standard, many multi-zone buildings can be treated as single-zone buildings by opening interior doors or by inducing equal pressures in adjacent zones.
International Standard does not address evaluation of air permeability of individual components.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 7345, Thermal insulation — Physical quantities and definitions
3 Terms, definitions, and symbols
3.1 Terms and definitions
For the purposes of this documcnt, the terms and definitions given in ISO 7345 and the following apply.
3.1.1 air leakage rate air flow rate across the building envelope
Note 1 to entry: This movement includes flow through joints, cracks, and porous surfaces, or a combination thereof, induced by the air-moving equipment used in this International Standard (see ClauseA).
3.1.2 building envelope boundary or barrier separating the inside of the building or part of the building subject to the test from the outside environment or another building or another part of the building
3.1.3 air change rate air leakage rate per internal volume across the building envelope
4 Apparatus
4.1 General
The following description of apparatus is general in nature. Any arrangement of equipment using the same principles and capable of performing the test procedure within the allowable tolerances is permitted. Examples of equipment configurations commonly used are indicated in Annex A.
Periodic calibration of the measurement system, used in this test method, according to manufacturer specifications or to standardized quality insurance systems is required.
4.2 Equipment
4.2.1 Air-moving equipment
Device that is capable of inducing a specific range of positive and negative pressure differences across the building envelope or part thereof. The system shall provide a constant air flow at each pressure difference for the period required to obtain readings of air flow rate.
4.2.2 Pressure-measuring device
Instrument capable of measuring pressure differences with an accuracy of ±1 Pa in the range of 0 Pa to 100 Pa.
4.2.3 Air flow rate measuring system
Device capable of measuring air flow rate within ±7 % of the reading.
Care shall be taken if the principle underlying the measurement of volumetric flow rate is an orifice. The reading of the air flow rate shall be corrected according to air density (see Formula (2)].
4.2.4 Temperature-measuring device
Instrument capable of measuring temperature to an accuracy of ±0,5 K.ISO 9972 pdf download.
Tags: Thermal performance of buildings
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