ISO 24353-2008 Hygrothermal performance of building materials and products - Determination of moisture adsorption desorption properties in response to humidity .pdf

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1、 Reference number ISO 24353:2008(E) ISO 2008INTERNATIONAL STANDARD ISO 24353 First edition 2008-09-15 Hygrothermal performance of building materials and products Determination of moisture adsorption/desorption properties in response to humidity variation Performance hygrothermique des matriaux et pr

2、oduits pour le btiment Dtermination des proprits dadsorption/dsorption de lhumidit en rponse une fluctuation de lhumidit ISO 24353:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edit

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7、pyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2008 All rights reservedISO 24353:2008(E) ISO 2008 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Terms, definitions and symbols 1 3.1 Terms and definitions. 1 3.2 Symbols and un

8、its 2 4 Test specimens . 3 4.1 General. 3 4.2 Size. 3 4.3 Thickness 3 4.4 Number of specimens 3 5 Test apparatus 3 6 Setting of water vapour surface resistance . 4 7 Test method. 4 7.1 Test conditions . 4 7.2 Single cycle test of moisture adsorption/desorption content 5 7.3 Cyclic test of regular mo

9、isture adsorption/desorption content 6 8 Calculation. 7 8.1 Moisture adsorption/desorption content and the differences between them 7 8.2 Moisture adsorption/desorption rates 8 8.3 Fourth cycle moisture adsorption/desorption content. 8 9 Test report . 10 Annex A (normative) Setting of air flow on te

10、st specimen surface 11 Annex B (informative) Apparatus using salt saturated aqueous solution . 13 Annex C (informative) Calculation procedure of moisture infiltration coefficient. 17 Bibliography . 18 ISO 24353:2008(E) iv ISO 2008 All rights reservedForeword ISO (the International Organization for S

11、tandardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the ri

12、ght to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Internationa

13、l Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as

14、an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO

15、 24353 was prepared by Technical Committee ISO/TC 163, Thermal performance and energy use in the built environment, Subcommittee SC 1, Test and measurement methods. ISO 24353:2008(E) ISO 2008 All rights reserved v Introduction This International Standard describes a test method that is applicable to

16、 materials used to inhibit fluctuation of indoor relative humidity. Testing of sorption/desorption efficiency permits the evaluation of materials for applications such as adjusting the relative humidity of museum storage and exhibition spaces. Materials selected for their adsorption/desorption effic

17、iency have recently come to be used in homes and medical care facilities in the interest of creating healthy and comfortable indoor environments. INTERNATIONAL STANDARD ISO 24353:2008(E) ISO 2008 All rights reserved 1 Hygrothermal performance of building materials and products Determination of moist

18、ure adsorption/desorption properties in response to humidity variation 1 Scope This International Standard specifies a test method for determining moisture adsorption/desorption properties of building materials in response to humidity variation. This International Standard also defines the adsorptio

19、n/desorption efficiency of building materials, measured as the change in mass of a specimen moved from a given space to another one of different relative humidity and equal temperature. Moisture adsorption/desorption properties of materials are measured under conditions of a single cycle and several

20、 cycles. 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. ISO 12571:2000, H

21、ygrothermal performance of building materials and products Determination of hygroscopic sorption properties ISO 12572:2001, Hygrothermal performance of building materials and products Determination of water vapour transmission properties 3 Terms, definitions and symbols 3.1 Terms and definitions For

22、 the purposes of this document, the following terms and definitions apply. 3.1.1 moisture adsorption/desorption property property of a material related to its capacity for and efficiency in moisture adsorption/desorption 3.1.2 moisture adsorption process process by which moisture is adsorbed into a

23、material from ambient air until equilibrium is reached 3.1.3 moisture desorption process process by which moisture is desorbed from a material into ambient air until equilibrium is reached 3.1.4 moisture adsorption content amount of moisture adsorbed into a specimen of a given material per unit of s

24、urface area of that material ISO 24353:2008(E) 2 ISO 2008 All rights reserved3.1.5 moisture desorption content amount of moisture desorbed by a specimen of a given material per unit of surface area of that material 3.1.6 water vapour surface resistance resistance against the transfer of water vapour

25、 across the boundary layer between the ambient air and the surface of a building component such as a wall 3.1.7 resistance of water vapour transmission resistance against the transfer of water vapour through a building component, such as wall, from one surface in contact with the water vapour in the

26、 air to the other 3.1.8 moisture adsorption rate rate of adsorbing moisture of the material from the ambient air 3.1.9 moisture desorption rate rate of desorbing moisture of the material to the ambient air 3.2 Symbols and units Symbol Description Unit A Surface area of adsorption/desorption m 2G nAd

27、sorption/desorption rate at time n kg/(m 2 h) m 0Mass of the specimen after preconditioning kg m aMass of the specimen at the time of completion of moisture adsorption process kg m a4Mass of the specimen at the time of completion of moisture adsorption process of the 4th adsorption/desorption cycle

28、kg m dMass of the specimen at the time of completion of moisture desorption process kg m d3Mass of the specimen at the time of completion of moisture desorption process of the 3rd adsorption/desorption cycle kg m d4Mass of the specimen at the time of completion of moisture desorption process of the

29、4th adsorption/desorption cycle kg m nMass of specimen at time n kg m n1Mass of specimen at time n 1 kg R 1Resistance of water vapour on single-layered specimen m 2 hPa/g R 2Resistance of water vapour on double-layered specimen m 2 hPa/g t Elapsed time h 1/ Water vapour surface resistance of specime

30、n m 2 hPa/g A,aChange of moisture content at the time of completion of adsorption process kg/m 2 A,acMoisture adsorption content at the time of completion of moisture adsorption process of the 4th sorption/desorption cycle kg/m 2 A,dMoisture desorption content at the time of completion of desorption

31、 process kg/m 2 A,dcMoisture desorption content at the time of completion of moisture desorption process of the 4th adsorption/desorption cycle kg/m 2 A,sDifference between moisture adsorption/desorption content at the time of completion of the test kg/m 2 A,scDifference between moisture adsorption/

32、desorption content at the time of completion of the 4th adsorption/desorption cycle kg/m 2ISO 24353:2008(E) ISO 2008 All rights reserved 3 4 Test specimens 4.1 General The specimen shall be representatives of the product. The size, the thickness and the number of specimens shall be as specified in 4

33、.2 to 4.4, or otherwise selected ensuring that their moisture adsorption/desorption properties are properly evaluated. 4.2 Size The size of a specimen shall be at most 250 mm 250 mm but shall not be less than 100 mm 100 mm. 4.3 Thickness The thickness of a specimen shall be the same as the thickness

34、 of the product. 4.4 Number of specimens The number of specimens shall be one piece for each test condition. 5 Test apparatus The test apparatus consists of an electronic balance, a moisture-proof box with a programmable air conditioner and a thermometer, as shown in Figure 1. An apparatus of any st

35、ructure may be used as long as the criteria of measurement precision described for the different pieces of equipment (5.1 to 5.4) are satisfied. 5.1 Electronic balance, capable of weighing to the nearest 0,01 g for test specimens up to 6 kg. For test specimens exceeding 6 kg, an electronic balance c

36、apable of weighing to the nearest 0,1 g may be used. 5.2 Moisture-proof box with thermostat and/or hygrostat, equipped with a programmable air conditioner capable of being set at a specific temperature and humidity, having sufficient capacity to accommodate the specimen and containing the elements l

37、isted in 5.2.1 to 5.2.4. 5.2.1 Temperature sensor, positioned about 50 mm from the centre of the adsorption/desorption surface of the specimen and enabling the temperature to be maintained throughout the moisture-proof box to within 0,5 C. 5.2.2 Humidity gauge, of which the sensor of the hygrometer

38、is positioned about 50 mm from the centre of the moisture adsorption/desorption surface of the specimen and enables the humidity to be maintained throughout the moisture-proof box to within 3 % at any position. 5.2.3 Humidifier, using water vapour as the humidification source. Humidification methods

39、 that involve spraying water with an ultrasonic humidifier, or similar devices, shall not be employed. When humidity is changed stepwise, the desired humidity shall be reached quickly (as a rule, in less than 10 min). NOTE Salt saturated solutions can be used to adjust the relative humidity as indic

40、ated in Annex B. 5.2.4 Windscreen, set up to prevent any influence from airflow of the air conditioner. 5.3 Thermometer, capable of measuring the temperature to within 0,1C. 5.4 Hygrometer, capable of measuring the humidity to within 2 %. ISO 24353:2008(E) 4 ISO 2008 All rights reservedDimensions in

41、 millimetres Key 1 electronic balance 2 hygrometer 3 thermometer 4 specimen 5 moisture-proof box 6 rubber plug 7 windscreen 8 programmable air conditioner Figure 1 Typical test apparatus 6 Setting of water vapour surface resistance Air flow a along the surface of a specimen should be adjusted using

42、a fan to stir the air inside the moisture-proof box (see Annex A) so as to obtain water vapour surface resistance, as measured in A.5, equal to (13,3 1,3) m 2 hPa/g. 7 Test method 7.1 Test conditions For preconditioning and testing of a specimen, set the ambient temperature to (23 0,5) C, then maint

43、ain the ambient relative humidity to within 1 % of the value of relative humidity selected for testing. ISO 24353:2008(E) ISO 2008 All rights reserved 5 7.2 Single cycle test of moisture adsorption/desorption content 7.2.1 Preconditioning of the specimen Precondition the specimen until it reaches co

44、nstant mass, m 0 , at a given ambient relative humidity as specified in Table 1. A specimen shall be considered as having reached constant mass during the moisture adsorption process when the rate of increase in mass of adsorbed moisture is less than 0,01 g in 24 h. 7.2.2 Moisture barrier of test sp

45、ecimen Provide a moisture barrier consisting of aluminium foil or other appropriate material and cover the entire surface of the specimen except for a single adsorption/desorption face. Dimensions in millimetres Key 1 test specimen 2 moisture barrier (aluminium sheet or the like) aLength of moisture

46、 adsorption/desorption area. Figure 2 Moisture barrier of test specimen 7.2.3 Test procedure The test shall be carried out in two steps: a) Step 1: with relative humidity set at one value for the moisture adsorption process; b) Step 2: with relative humidity set at a lower value for the desorption p

47、rocess. Typical humidity values are given for reference in Table 1. Place the preconditioned test specimen into the test apparatus and quickly bring the water vapour surface resistance of the test specimen to the same value as that set for the calibration specimen. With water vapour surface resistan

48、ce thus adjusted, maintain the relative humidity at the Step 1 value for 12 h, then lower it to the Step 2 value and maintain it at this value for 12 h. Measure the change in mass of the test specimen over a consecutive 24 h period. Take the mass at the beginning of the 12 h Step 1 period to be zero

49、, then measure the mass of the test specimen (m n ) at 10 min intervals to the nearest 0,01 g. Record the mass at the end of the first 12 h period, the moisture adsorption process, as m a , and at the end of the second 12 h period, the moisture adsorption process, as m d . ISO 24353:2008(E) 6 ISO 2008 All rights reservedTable 1 Relative humidity levels to be set for preconditioning and moisture adsorption/desorption process Relative humidity % Moisture adsorption process