SIST EN 16795:2016
(Main)Plastics - Method for estimating heat build up of flat surfaces by simulated solar radiation
Plastics - Method for estimating heat build up of flat surfaces by simulated solar radiation
This European Standard specifies a method for estimating the temperature increase of a flat polymer
surface, due to its solar radiant energy absorption, compared to the ambient temperature.
For that purpose, a specimen and black and white reference plates are exposed to simulated solar
radiation under specified conditions (simulated solar radiation, ambient air temperature, convective
flow). For opaque specimens, a thermally sensitive electrical element at the backside or a pyrometer is
used to measure the surface temperature. For translucent specimens, a pyrometer is used to measure
surface temperature.
NOTE Some specific polymeric materials are translucent (transparent) and might have a transmittance
window in a wavelength range where the used pyrometer is sensitive (e.g. polyethylene). The surface temperature
of these materials cannot be measured with the contact and the contactless method.
Kunststoffe - Verfahren mit simulierter Sonnenstrahlung zur Bewertung der Aufheizung auf ebenen Oberflächen
Plastiques - Méthode d'estimation de l'échauffement de surfaces planes par rayonnement solaire simulé
La présente Norme Européenne spécifie une méthode visant à estimer l’augmentation de la température d’une surface de polymère plane par rapport à la température ambiante, causée par l’absorption de l’énergie solaire rayonnante par cette surface.
À cet effet, une éprouvette et des plaques de référence noires et blanches sont exposées au rayonnement solaire simulé dans des conditions spécifiées (rayonnement solaire simulé, température de l’air ambiant, flux de convection). S’agissant des éprouvettes opaques, un élément électrique thermosensible placé sur leur face arrière ou un pyromètre est utilisé pour mesurer la température superficielle. Un pyromètre est utilisé pour mesurer la température superficielle des éprouvettes translucides.
NOTE Quelques matériaux polymères spécifiques sont translucides (transparents) et peuvent avoir une plage de transmittance dans un domaine de longueurs d’ondes dans lequel le pyromètre utilisé est sensible (par exemple, le polyéthylène). La température superficielle de ces matériaux ne peut pas être mesurée par les méthodes avec contact et sans contact.
Polimerni materiali - Metoda za ugotavljanje toplotno ojačenih ravnih površin s simulacijo sončnega obsevanja
Ta evropski standard določa metodo za ugotavljanje porasta temperature ravne polimerne površine zaradi vpijanja sončne energije v primerjavi s temperaturo okolice. V ta namen se vzorčna bela in črna referenčna plošča izpostavita simuliranemu sončnemu obsevanju pod določenimi pogoji (simulirano sončno obsevanje, temperatura zraka v okolici, konvekcijski tok). Pri neprosojnih vzorcih se za merjenje temperature površine uporablja termalno občutljiv električni element na hrbtni strani pirometra. Pri prosojnih vzorcih se za merjenje temperature površine uporablja pirometer.
OPOMBA Nekateri posebni polimerni materiali so prosojni (prozorni) in imajo morda okno prehodnosti v razponu valovne dolžine, kjer je uporabljeni pirometer občutljiv (npr. polietilen). Temperature površine teh materialov ni mogoče izmeriti z metodo kontakta in metodo brez kontakta.
General Information
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kunststoffe - Verfahren mit simulierter Sonnenstrahlung zur Bewertung der Aufheizung auf ebenen OberflächenPlastiques - Méthode d'estimation de l'échauffement de surfaces planes par rayonnement solaire simuléPlastics - Method for estimating heat build up of flat surfaces by simulated solar radiation83.080.01Polimerni materiali na splošnoPlastics in generalICS:Ta slovenski standard je istoveten z:EN 16795:2015SIST EN 16795:2016en,fr,de01-februar-2016SIST EN 16795:2016SLOVENSKI
STANDARD
SIST EN 16795:2016
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 16795
December
t r s w ICS
z uä r z rä r s English Version
Plastics æ Method for estimating heat build up of flat surfaces by simulated solar radiation Plastiques æ Méthode d 5estimation de l 5échauffement de surfaces planes par rayonnement solaire simulé
Kunststoffe æ Verfahren mit simulierter Sonnenstrahlung zur Bewertung der Aufheizung auf ebenen Oberflächen This European Standard was approved by CEN on
y November
t r s wä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey andUnited Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels
9
t r s w CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s x y { wã t r s w ESIST EN 16795:2016
EN 16795:2015 (E) 2 Contents Page European foreword . 3 Introduction . 4 1 Scope . 5 2 Normative references . 5 3 Terms and definitions . 5 4 Abbreviations . 5 5 Principle . 5 6 Apparatus . 6 6.1 General . 6 6.2 Test chamber . 6 6.3 Laboratory radiation source . 6 6.4 Radiometer . 7 6.5 Test chamber temperature and relative humidity . 7 6.6 Surface temperature measurement device . 7 6.7 Black and white standard thermometer . 8 6.8 Defined airflow directed across the sample . 9 6.9 Specimen holders . 9 7 Test specimens . 9 7.1 Form, shape and preparation . 9 7.2 Number of test specimens . 9 8 Exposure conditions . 9 8.1 Radiation . 9 8.2 Black and white standard thermometer . 9 8.3 Chamber air temperature . 10 8.4 Relative humidity of chamber air. 10 8.5 Wind speed . 10 8.6 Sets of exposure conditions . 10 9 Procedure. 10 9.1 General . 10 9.2 Mounting the test specimens . 10 9.3 Exposure . 10 9.4 Measurement of the surface temperature . 11 10 Test report . 11 Bibliography . 12
SIST EN 16795:2016
EN 16795:2015 (E) 3 European foreword This document (EN 16795:2015) has been prepared by Technical Committee CEN/TC 249 “Plastics”, the secretariat of which is held by NBN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June 2016 and conflicting national standards shall be withdrawn at the latest by June 2016. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 16795:2016
EN 16795:2015 (E) 4 Introduction Solar radiation causes the temperature of irradiated surfaces to rise substantially above the temperature of the surrounding air. The resulting surface temperature depends on the climatic parameters at the location in question, the spectral absorption of the surface, the geometric dimensions and on the specific structure of the object. Generally, the darker the colour, the more the sun's energy is absorbed and the higher is the heat build-up. The performance characteristics of most of the materials are also defined by the in service temperature. Such materials can be window profiles or other polymeric carrier materials. The micro climate at house walls is also essential defined by the absorbed solar radiation (depending on the material properties). The same applies for interior room and automobile temperatures. The examples reveal the significance of the knowledge of the temperature of sun irradiated surfaces. If the temperature magnitude is estimated to be critical, provisions can be taken to optimize the in-service micro climate, e.g. reduction of the in-service temperature by improvement of the spectral reflection characteristics or appropriate change in design and improving the air conditioning. SIST EN 16795:2016
EN 16795:2015 (E) 5 1 Scope This European Standard specifies a method for estimating the temperature increase of a flat polymer surface, due to its solar radiant energy absorption, compared to the ambient temperature. For that purpose, a specimen and black and white reference plates are exposed to simulated solar radiation under specified conditions (simulated solar radiation, ambient air temperature, convective flow). For opaque specimens, a thermally sensitive electrical element at the backside or a pyrometer is used to measure the surface temperature. For translucent specimens, a pyrometer is used to measure surface temperature. NOTE Some specific polymeric materials are translucent (transparent) and might have a transmittance window in a wavelength range where the used pyrometer is sensitive (e.g. polyethylene). The surface temperature of these materials cannot be measured with the contact and the contactless method. 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. EN ISO 4892-1, Plastics - Methods of exposure to laboratory light sources - Part 1: General guidance (ISO 4892-1) ISO 9370, Plastics - Instrumental determination of radiant exposure in weathering tests - General guidance and basic test method 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 9370 apply. 4 Abbreviations BST black-standard thermometer CHT chamber air temperature RTD resistance temperature detector WST white-standard thermometer 5 Principle 5.1 A xenon or metal halide arc lamp, fitted with filters, is used to simulate the spectral irradiance of global solar radiation. 5.2 Specimens are exposed to various levels of simulated global solar radiation, heat, and relative humidity and air flow under controlled environmental conditions, including: a) the irradiance level; b) the air flow directed over the test specimen; c) the ambient air temperature during the exposure to simulated global solar radiation; SIST EN 16795:2016
EN 16795:2015 (E) 6 d) the relative humidity in the chamber during the exposure to simulated global solar radiation. 5.3 The procedure may include measurements of the global irradiance in the plane of the specimens. 5.4 The procedure includes measurements of the surface temperature in the plane of the specimens. 5.5 It is recommended to expose simultaneously with the test specimens a black standard (BST) and white standard (WST) thermometer as specified in EN ISO 4892-1 to provide a standard for comparative purposes. 5.6 Comparison of results obtained from specimens exposed in different apparatus should not be made unless an appropriate statistical relationship has been established between the apparatuses for the particular material exposed. 6 Apparatus 6.1 General The equipment comprises a test chamber, an ozone-free radiation source which generates UV, visible, and infrared radiation similar to solar radiation. A contactless surface temperature device (pyrometer) or contact temperature measuring systems may be part of the device. 6.2 Test chamber The design of the test chamber may vary, but it shall be constructed from inert material and shall
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