EN 13187-1998 en Thermal Performance of Buildings - Qualitative Detection of Thermal Irregularities in Building Envelopes - Infrared Method《建筑物的热性能建筑物外墙热不均匀性定性测定红外线法(ISO 6781-1983 .pdf
《EN 13187-1998 en Thermal Performance of Buildings - Qualitative Detection of Thermal Irregularities in Building Envelopes - Infrared Method《建筑物的热性能建筑物外墙热不均匀性定性测定红外线法(ISO 6781-1983 .pdf》由会员分享,可在线阅读,更多相关《EN 13187-1998 en Thermal Performance of Buildings - Qualitative Detection of Thermal Irregularities in Building Envelopes - Infrared Method《建筑物的热性能建筑物外墙热不均匀性定性测定红外线法(ISO 6781-1983 .pdf(15页珍藏版)》请在麦多课文档分享上搜索。
1、Thermal performance of buildings - Qualitative detection of thermal irregularities in building envelopes - Infrared method (IS0 6781:1983 modified) The European Standard EN 13187:1998 has the status of a British Standard ICs 91.120.10 BS EN 13187:1999 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERM
2、ITTED BY COPYRIGHT LAW - STD-BSI BS EN 13187-ENGL 1999 W Lb24bb7 0757LbU bbL W direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 March 1999 Amd. No. O BSI 03-1999 BS EN 1318R1999 Date Text affected National forewor
3、d This British Standard is the English language version of EN 131871998. The K participation in its preparation was entrusted by Technical Committee RHE9, Thermal insulating materials, to Subcommittee RHE/9/2, Thermal properties of insdating materials, which has the responsibility to: - aid enquirer
4、s to understand the text, - present to the responsible European committee any enquiries on the - monitor related intedonal and European developments and promulgate interpretation, or proposals for change, and keep the UK interests informed; them in the UK A list of organizations represented on this
5、committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “Inkrnational Standards Correspondence Index“, or b
6、y using the “Find“ facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a conmt Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunit
7、y from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 12, an inside back cover and a back cover. ISBN O 680 30922 3 I I STD-BSI BS EN 13L87-ENGL 1777 H Lb24bb9 0757LbL 5TB H EUROPEAN SIANDARD NORME EUR0PEE”E EUROP Evalu
8、ation of temperature anticipatediactual distribution from temperature distribution thermal image Comparison of b) ascertaining whether this surface temperature distribution is “abnormal“, i.e. if it is due, for example, to insulation defects, moisture content ardor air leakage; c) if so, assessment
9、of the type and the extent of defects. In order to determine whether the observed variations in the thermal insulation properties are abnormal, the thermograms obtained are compared with the anticipated temperature distribution over the surface, determined by the design characteristics of the buildi
10、ng envelope and by the environment at the time of examhation. The anticipated temperature distributions can be determined by means of “reference thermograms“ (see 6.3 and annexes A, B and C), calcuiations or other investigations. This determinati on is based on drawings and other documens relating t
11、o the extemal envelope and to the heating and ventilation system of the building under investigation. The general procedure for the interpretation of thed images is represented schematidy in Figure 1. 1 I I - r I Casual mechanisms leading I to thermal irregularities of 1 similar structures from them
12、o- I examination of the building O BSI 03-1999 6 Irrared radiation sensing system The infrared radiation sensing system shall comprise. a) an infrased radiation sensor, operating at a wavelength between 2 pn and 12 km, which can sense apparent radiance temperatures of interest with sufficient resolu
13、tionl); b) a device which renders visible and displays, in the form of a thermal image, the apparent radiance temperature over the surface being examined; e) a device which makes it possible to record the thermal image and, if relevant, measured digital data; d) a means of establishing temperature l
14、evels on the surface under examinati on. During the test period, no significant drift in the infrared radiation sensing system shall occur. 6 Thermographic examination 6.1 General test requirements In order to defuie the actual test requirements, and in particular the side of the building envelope (
15、outdoors or indoors) from which the thermographic examination is to be perormed, the following factors need to be considered a) the specifications and capabilities of the thermographic equipment; b) the characteristics of the building envelope, i.e. the respective types and locations of heating syst
16、ems, stmcturd elements and insulating iayers; e) the radiative properties of the surface, e.g. the cladding mate- d) climatic factors; e) accessibility for easy inspection; f) influences of the environment; g) other factors of importance. The temperature difference across the envelope shall be suffi
17、ciently large to permit the detection of thermal irregularities. For ease of interpretation, the thermographic examination should preferably be carried out with constant temperature and pressure differences across the envelope. (The interpretation of thermograms taken under non-steady state conditio
18、ns requires a higher degree of expertise and knowledge of building physics.) This implies, among other things, that the test shall not be canied out when the outside or inside air temperature is liable to vary considerably, or when the structure is exposed to direct solar radiation, or when the wind
19、 varies markedly. These general requirements shall be considered when a thermographic examination is camied out. The actual requirements may be varied according to the thermal properties of the building envelope under examination Page 5 EN 131871998 and the characteristics of the infrared radiation
20、sensing system used They may b) the regularity and incidence of colder or warmer sections, for instance over studs and corners; c) the location of the contours and characteristic shape of the colder or warmer sections; d) the measured difference between the “normal“ surface temperature of the consts
21、uction and the temperature of the selected colder or warmer sections; rregukities in the appearance of a thermogram often indicate a defect in the building envelope. The appearance of a thermogram relating to a construction with a defect may vary considerably. 6.4 Examples of pattern characteristics
22、 a) Air leakage (often at joints and junctions) in the building envelope often produces irreguiar shapes with uneven boundaries and large temperature VariationS. b) Missing insulation produces reguiar and well defined shapes not associated with features of the building dmcture. The defect area has a
23、 reiatively even temperature variation. c) Moisture present in the structure normally produces a mottled and diffuse pattern. Temperature variations are not extreme within the pattern. The type of defect shall be determined. This may be done by calculation, by other investigations, from experience o
24、r by comparing the actual thermograms with reference thermograms for structures with known thermal insuiation defects and air leakages of various kinds. Such determinations shall be thoroughly substantiated in the thermographic report. For those parts of the building envelope in which the presence o
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