{"id":10283,"date":"2021-08-09T09:00:01","date_gmt":"2021-08-09T07:00:01","guid":{"rendered":"https:\/\/eoc.cat\/lamparas-descarga\/"},"modified":"2022-02-17T10:43:50","modified_gmt":"2022-02-17T09:43:50","slug":"llums-descarrega","status":"publish","type":"post","link":"https:\/\/eoc.cat\/ca\/llums-descarrega\/","title":{"rendered":"Llums de desc\u00e0rrega. Fonts de llum luminescents"},"content":{"rendered":"<p>Saps qu\u00e8 s\u00f3n els <strong>llums de desc\u00e0rrega<\/strong> i qu\u00e8 caracteritza a les fonts de llum luminescents? En aquest article volem introduir-te en aquests conceptes. Es tracta de contingut habitual per als especialistes en l&#8217;electricitat.<\/p>\n<h2>Descobrint els llums de desc\u00e0rrega<\/h2>\n<p>Abans d&#8217;entrar en mat\u00e8ria, \u00e9s important distingir entre els dos principals <strong>tipus de fonts lluminoses<\/strong> existents en la naturalesa:<\/p>\n<ul>\n<li>Fonts <strong>incandescents<\/strong>: S\u00f3n aquelles que produeixen calor alhora que llum, com \u00e9s el cas del foc.<\/li>\n<li>Fonts <strong>luminescents<\/strong>: Produeixen llum sense emetre energia en forma de calor. \u00c9s a dir, no augmenten la seva temperatura respecte a l&#8217;entorn. Un bon exemple? Les cuques de llum.<\/li>\n<\/ul>\n<h2>Llum de desc\u00e0rrega: concepte i funcionament<\/h2>\n<p>Aquest tipus de llum es caracteritza per usar com a element llumin\u00f3s el <strong>corrent el\u00e8ctric generat per un gas<\/strong>. Es contraposa a la de filament, que es recolza en un circuit s\u00f2lid per a generar el seu corrent el\u00e8ctric.<\/p>\n<p>En general, es basen en una butllofa que cont\u00e9 gasos o vapors met\u00e0l\u00b7lics. Quan les actives, es produeix una desc\u00e0rrega el\u00e8ctrica en ells. \u00c9s a dir, la llum \u00e9s emesa a trav\u00e9s d&#8217;un gas ionitzat, no per un filament s\u00f2lid.<\/p>\n<p>Ara b\u00e9, com es concreta el <strong>funcionament del llum de desc\u00e0rrega<\/strong>, sigui del tipus que sigui? L&#8217;encesa exigeix la pres\u00e8ncia d&#8217;un dispositiu que el produeix amb un alt voltatge d&#8217;inici. A continuaci\u00f3, descendeix l&#8217;energia el\u00e8ctrica fins a la normalitat. Aquest element es coneix com a balast o react\u00e0ncia. Els m\u00e9s antics s\u00f3n els de coure i, actualment, s&#8217;estan reempla\u00e7ant per uns altres de tipus electr\u00f2nic.<\/p>\n<p>L&#8217;emissi\u00f3 lum\u00ednica requereix crear un corrent el\u00e8ctric entre <strong>sengles el\u00e8ctrodes<\/strong>, situats dins d&#8217;un tub ple de gas o vapor. La difer\u00e8ncia de potencial entre tots dos genera un flux d&#8217;el\u00e8ctrodes, els quals travessen el gas. Quan aquests xoquen amb els electrons externs dels \u00e0toms, l&#8217;energia es transmet.<\/p>\n<h3>Qu\u00e8 ocorre llavors? Hi ha dues possibilitats<\/h3>\n<ol>\n<li><strong>L&#8217;energia generada \u00e9s tanta que el xoc despla\u00e7a del seu orbital a l&#8217;electr\u00f3<\/strong>. Aquest pot xocar amb uns altres i provocar id\u00e8ntic efecte. A conseq\u00fc\u00e8ncia d&#8217;aix\u00f2, si no es frena a temps, el llum queda destru\u00efda per l&#8217;excessiu corrent.<\/li>\n<li><strong>L&#8217;electr\u00f3 no \u00e9s arrencat del seu empla\u00e7ament<\/strong>. Per tant, acaba ocupant un altre orbital d&#8217;una energia superior. \u00c9s un estat inestable que, de seguida, torna a la situaci\u00f3 de partida. En dur-se a terme, l&#8217;electr\u00f3 emet energia extra com a radiaci\u00f3 electromagn\u00e8tica, ja sigui ultraviolada o visible. D&#8217;aquesta manera s&#8217;emet una llum que, en aquests sistemes, no \u00e9s purament blanca.<\/li>\n<\/ol>\n<p>Tingues en compte, per aix\u00f2, que <strong>la capacitat d&#8217;aquests llums per a reproduir colors \u00e9s inferior a unes altres<\/strong>. Com a aspecte positiu, produeixen la llum de manera m\u00e9s econ\u00f2mica i eficient.<\/p>\n<h2>Components d&#8217;un llum de desc\u00e0rrega<\/h2>\n<p>Arribats a aquest punt, potser t&#8217;est\u00e0s preguntant quins s\u00f3n els elements dels llums de desc\u00e0rrega. Les m\u00e9s populars s\u00f3n els fluorescents que, en general, inclouen aquests components:<\/p>\n<ul>\n<li>Tub exterior de vidre.<\/li>\n<li>Revestiment interior de material fluorescent.<\/li>\n<li>Gasos i vapor de mercuri a baixa pressi\u00f3.<\/li>\n<li>Filament<\/li>\n<li>El\u00e8ctrode sensor.<\/li>\n<li>El\u00e8ctrodes escalfats.<\/li>\n<li>Balast<\/li>\n<li>React\u00e0ncia electr\u00f2nica.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-9245 size-full\" title=\"bombeta encesa\" src=\"https:\/\/eoc.cat\/wp-content\/uploads\/2021\/06\/lamparas-de-descarga.jpg\" alt=\"bombeta encesa\" width=\"810\" height=\"513\" srcset=\"https:\/\/eoc.cat\/wp-content\/uploads\/2021\/06\/lamparas-de-descarga.jpg 810w, https:\/\/eoc.cat\/wp-content\/uploads\/2021\/06\/lamparas-de-descarga-480x304.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 810px, 100vw\" \/><\/p>\n<h2>Caracter\u00edstiques principals<\/h2>\n<p>Ara ja tens una mica m\u00e9s clar qu\u00e8 s\u00f3n els llums de desc\u00e0rrega. Potser, fins i tot, has comen\u00e7at a plantejar-te la possibilitat d&#8217;utilitzar-les en el teu dia a dia. Si ho fas, et conv\u00e9 con\u00e8ixer quines s\u00f3n les seves caracter\u00edstiques m\u00e9s diferencials:<\/p>\n<ul>\n<li><strong>Rendiment llumin\u00f3s<\/strong> molt alt. Quan les compares amb els altres llums, les dades parlen per si sols.<\/li>\n<li>Emissi\u00f3 de <strong>llum compacta<\/strong> i homog\u00e8nia.<\/li>\n<li>Gran <strong>durabilitat<\/strong>. La seva vida \u00fatil es multiplica, la qual cosa possibilita un significatiu estalvi econ\u00f2mic, tant en el manteniment com en la reposici\u00f3<\/li>\n<\/ul>\n<h2>Classificaci\u00f3 de les llums de desc\u00e0rrega<\/h2>\n<p>La primera categoria important que has de diferenciar \u00e9s:<\/p>\n<ul>\n<li><strong>De baixa pressi\u00f3:<\/strong> S\u00f3n les fluorescents i les fluorescents compactes.<\/li>\n<li><strong>D&#8217;alta pressi\u00f3:<\/strong> El seu principal atribut \u00e9s que difonen un espectre lum\u00ednic molt intens.<\/li>\n<\/ul>\n<p>Com no pot ser d&#8217;una altra manera, entre els tipus disponibles actualment existeixen diferents opcions. \u00c9s bo que tamb\u00e9 et familiaritzis amb elles i, almenys, s\u00e0pigues que s\u00f3n d&#8217;aquest mateix tipus:<\/p>\n<ul>\n<li><strong>Fluorescents:<\/strong> D&#8217;ells ja hem parlat pr\u00e8viament.<\/li>\n<li><strong>Llums de vapor de mercuri:<\/strong> Funcionen de la mateixa manera que les anteriors. En apagar-les no \u00e9s possible tornar a encendre-les a continuaci\u00f3.<\/li>\n<li><strong>Llums de vapor de sodi a alta pressi\u00f3:<\/strong> La seva intensitat de corrent-tensi\u00f3 d&#8217;arc positiva \u00e9s el seu tret m\u00e9s cridaner i important. Duren entre 14 000 i 15 000 hores.<\/li>\n<li><strong>Llums d&#8217;halogenurs met\u00e0l\u00b7lics:<\/strong> Per a tornar a encendre-les han de passar entre 10 i 20 minutos. La seva durada \u00e9s de 6000 a 7000 hores.<\/li>\n<li><strong>Llums de vapor de sodi a baixa pressi\u00f3:<\/strong> Compten amb un rendiment llumin\u00f3s de 180 lm\/W, i la seva vida mitjana \u00fatil aconsegueix les 10 000 hores.<\/li>\n<\/ul>\n<p>Com veus, els <strong>llums de desc\u00e0rrega <\/strong>s\u00f3n un aut\u00e8ntic univers que, potser, desconeixies. T&#8217;atreuen els <a href=\"https:\/\/eoc.cat\/ca\/curs-delectricitat-general\/\">coneixements sobre l&#8217;electricitat<\/a> i les fonts lluminoses? Sens dubte, amb tot el que has apr\u00e8s, acabar\u00e0s veient la llum.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Saps qu\u00e8 s\u00f3n els llums de desc\u00e0rrega i qu\u00e8 caracteritza a les fonts de llum luminescents? En aquest article volem introduir-te en aquests conceptes. Es tracta de contingut habitual per als especialistes en l&#8217;electricitat. Descobrint els llums de desc\u00e0rrega Abans d&#8217;entrar en mat\u00e8ria, \u00e9s important distingir entre els dos principals tipus de fonts lluminoses existents [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":9248,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"off","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[81],"tags":[82],"class_list":["post-10283","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-electricitat-general","tag-electricitat-general"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Llums de desc\u00e0rrega. 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