{"id":1802,"date":"2014-11-25T10:49:12","date_gmt":"2014-11-25T10:49:12","guid":{"rendered":"http:\/\/\/wpweb\/?page_id=1802"},"modified":"2020-10-29T09:08:57","modified_gmt":"2020-10-29T09:08:57","slug":"mesura-de-la-radiacio-solar-global","status":"publish","type":"page","link":"https:\/\/www.meteo.cat\/wpweb\/divulgacio\/equipaments-meteorologics\/estacions-meteorologiques-automatiques\/funcionament-ema\/mesura-de-la-radiacio-solar-global\/","title":{"rendered":"Mesura de la radiaci\u00f3 solar global"},"content":{"rendered":"\n<p>La mesura de la radiaci\u00f3 solar global fa refer\u00e8ncia a la irradi\u00e0ncia (flux radiant rebut per unitat de superf\u00edcie)&nbsp; en una superf\u00edcie horitzontal, i \u00e9s la resultant de la radiaci\u00f3 solar directe i difusa incident. La unitat de mesura en el Sistema Internacional \u00e9s el W\/m<sup>2<\/sup>; pot\u00e8ncia energ\u00e8tica per unitat de superf\u00edcie.<\/p>\n\n\n\n<p>La major part de sensors utilitzats en aplicacions meteorol\u00f2giques s\u00f3n piran\u00f2metres termoel\u00e8ctrics. Aquests, es basen en l&#8217;electricitat generada a partir de la difer\u00e8ncia de temperatura entre dues parts del sensor, i mesuren en el rang de longitud d&#8217;ona de 0.3 a 3\u03bcm, que correspondria a l&#8217;espectre que va de l&#8217;ultraviolat a l&#8217;infraroig, passant pel visible.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><a href=\"https:\/\/static-m.meteo.cat\/wordpressweb\/wp-content\/uploads\/2014\/11\/25104912\/mesura_radiacio_solar1.jpg\"><img loading=\"lazy\" width=\"400\" height=\"100\" src=\"https:\/\/static-m.meteo.cat\/wordpressweb\/wp-content\/uploads\/2014\/11\/25104912\/mesura_radiacio_solar1.jpg\" alt=\"Exemples de piran\u00f2metres termoel\u00e8ctrics\" class=\"wp-image-2215\" \/><\/a><\/figure><\/div>\n\n\n\n<p>La difer\u00e8ncia de temperatures entre les unions c\u00e0lides (disc cer\u00e0mic central pintat de negre en franges o en la seva totalitat) i fredes (el cos del sensor o les franges blanques del disc) genera un voltatge proporcional a la radiaci\u00f3 solar incident.<\/p>\n\n\n\n<p>Aquest voltatge es genera a partir de l&#8217;associaci\u00f3 en s\u00e8rie de diverses termopiles (uni\u00f3 de dos conductors met\u00e0l\u00b7lics)&nbsp; anomenades termoparells.<\/p>\n\n\n\n<p>S&#8217;instal\u00b7len en posici\u00f3 horitzontal a 2 m del terra.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La mesura de la radiaci\u00f3 solar global fa refer\u00e8ncia a la irradi\u00e0ncia (flux radiant rebut per unitat de superf\u00edcie)&nbsp; en una superf\u00edcie horitzontal, i \u00e9s la resultant de la radiaci\u00f3 solar directe i difusa incident. La unitat de mesura en el Sistema Internacional \u00e9s el W\/m2; pot\u00e8ncia energ\u00e8tica per unitat de superf\u00edcie. La major part [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"parent":1769,"menu_order":5,"comment_status":"closed","ping_status":"open","template":"template-sidebar.php","meta":{"_mi_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0},"_links":{"self":[{"href":"https:\/\/www.meteo.cat\/wpweb\/wp-json\/wp\/v2\/pages\/1802"}],"collection":[{"href":"https:\/\/www.meteo.cat\/wpweb\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.meteo.cat\/wpweb\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.meteo.cat\/wpweb\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.meteo.cat\/wpweb\/wp-json\/wp\/v2\/comments?post=1802"}],"version-history":[{"count":6,"href":"https:\/\/www.meteo.cat\/wpweb\/wp-json\/wp\/v2\/pages\/1802\/revisions"}],"predecessor-version":[{"id":29704,"href":"https:\/\/www.meteo.cat\/wpweb\/wp-json\/wp\/v2\/pages\/1802\/revisions\/29704"}],"up":[{"embeddable":true,"href":"https:\/\/www.meteo.cat\/wpweb\/wp-json\/wp\/v2\/pages\/1769"}],"wp:attachment":[{"href":"https:\/\/www.meteo.cat\/wpweb\/wp-json\/wp\/v2\/media?parent=1802"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}