{"id":2039,"date":"2015-10-16T08:17:23","date_gmt":"2015-10-16T08:17:23","guid":{"rendered":"http:\/\/clusterincendis.com\/?p=2039"},"modified":"2015-10-16T08:17:23","modified_gmt":"2015-10-16T08:17:23","slug":"plugholing-o-nombre-minim-de-punts-dextraccio-de-fums","status":"publish","type":"post","link":"https:\/\/clusterincendis.com\/en\/plugholing-o-nombre-minim-de-punts-dextraccio-de-fums\/","title":{"rendered":"\u201cPlugholing\u201d o nombre m\u00ednim de punts d&#8217;extracci\u00f3 de fums"},"content":{"rendered":"<p><strong><a title=\"PREFIRE\" href=\"http:\/\/prefire.es\" target=\"_blank\" rel=\"noopener\">PREFIRE <\/a>ens presenta aquest article sobre el plugholing i la import\u00e0ncia d&#8217;un c\u00e0lcul adequat per a una bona extracci\u00f3 de fums.<\/strong><\/p>\n<p>En la realitzaci\u00f3 del c\u00e0lcul del nombre d&#8217;exutoris o equips d&#8217;extracci\u00f3 for\u00e7ada en un projecte on \u00e9s necess\u00e0ria l&#8217;evacuaci\u00f3 de fums segons la UNE 23585, \u00e9s important verificar el par\u00e0metre del nombre m\u00ednim de punts d&#8217;extracci\u00f3 de fums, entre altres par\u00e0metres de disseny d&#8217;un SCTEH (Sistema de Control de Temperatura i Evacuaci\u00f3 de Fums).<\/p>\n<p>Aquest valor \u00e9s important at\u00e8s que, quan el gruix de la capa de fum sota un exutori \u00e9s igual o inferior a un valor determinat, una velocitat d&#8217;extracci\u00f3 massa elevada a trav\u00e9s de l&#8217;obertura pot provocar l&#8217;extracci\u00f3 d&#8217;aire procedent de la capa freda existent per sota de la capa de fums.<\/p>\n<p>El disseny d&#8217;una prima capa de fums provocaria una via preferent d&#8217;evacuaci\u00f3 d&#8217;aire net inferior en lloc de la capa superior de fums.<\/p>\n<p><a href=\"http:\/\/clusterincendis.com\/wp-content\/uploads\/2015\/10\/Plugholing-Prefire-3.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-2032\" src=\"http:\/\/clusterincendis.com\/wp-content\/uploads\/2015\/10\/Plugholing-Prefire-3-450x248.jpg\" alt=\"Plugholing-Prefire (3)\" width=\"376\" height=\"207\" \/><\/a><\/p>\n<p>Qualsevol altre intent d&#8217;incrementar el valor d&#8217;extracci\u00f3 d&#8217;aquest punt, nom\u00e9s servir\u00e0 per atreure aire dins de l&#8217;orifici des de sota la capa de fums. Aquest efecte \u00e9s conegut de vegades com &#8220;plugholing&#8221;, &#8220;efecte v\u00f2rtex&#8221; o &#8220;efecte desgu\u00e0s&#8221;. Aix\u00f2 implica que, per a una extracci\u00f3 eficient, el nombre de punts d&#8217;extracci\u00f3 es triar\u00e0 per evitar que l&#8217;aire sigui atret cap amunt per aquest cam\u00ed.<\/p>\n<p><a href=\"http:\/\/clusterincendis.com\/wp-content\/uploads\/2015\/10\/Plugholing-Prefire-4.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-2033\" src=\"http:\/\/clusterincendis.com\/wp-content\/uploads\/2015\/10\/Plugholing-Prefire-4-450x225.jpg\" alt=\"Plugholing-Prefire (4)\" width=\"444\" height=\"222\" \/><\/a><\/p>\n<p>El nombre es pot determinar amb el c\u00e0lcul del valor cr\u00edtic d&#8217;extracci\u00f3 per a una obertura, m\u00e9s enll\u00e0 del qual l&#8217;aire seria atret a trav\u00e9s de la capa. La norma UNE 23585 indica la forma d&#8217;obtenir aquesta dada de forma emp\u00edrica.<\/p>\n<p>D&#8217;altra banda, s&#8217;ha de tenir present que, amb independ\u00e8ncia del plugholing ha un gruix m\u00ednim de la capa de fums sota la coberta per assegurar en tot moment la flotabilitat dels d\u2019aquests.<\/p>\n<p>En recintes d&#8217;incendi no excessivament grans, el gruix de la capa de fums s&#8217;ha de fixar en m\u00ednim un 10% del valor de l\u2019al\u00e7ada del sostre a la localitzaci\u00f3 de la font d&#8217;ignici\u00f3 de l\u2019incendi.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PREFIRE ens presenta aquest article sobre el plugholing i la import\u00e0ncia d&#8217;un c\u00e0lcul adequat per a una bona extracci\u00f3 de fums. En la realitzaci\u00f3 del c\u00e0lcul del nombre d&#8217;exutoris o [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":2032,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[103],"tags":[],"class_list":["post-2039","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog-en"],"acf":[],"_links":{"self":[{"href":"https:\/\/clusterincendis.com\/en\/wp-json\/wp\/v2\/posts\/2039","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/clusterincendis.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/clusterincendis.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/clusterincendis.com\/en\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/clusterincendis.com\/en\/wp-json\/wp\/v2\/comments?post=2039"}],"version-history":[{"count":1,"href":"https:\/\/clusterincendis.com\/en\/wp-json\/wp\/v2\/posts\/2039\/revisions"}],"predecessor-version":[{"id":2040,"href":"https:\/\/clusterincendis.com\/en\/wp-json\/wp\/v2\/posts\/2039\/revisions\/2040"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/clusterincendis.com\/en\/wp-json\/wp\/v2\/media\/2032"}],"wp:attachment":[{"href":"https:\/\/clusterincendis.com\/en\/wp-json\/wp\/v2\/media?parent=2039"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/clusterincendis.com\/en\/wp-json\/wp\/v2\/categories?post=2039"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/clusterincendis.com\/en\/wp-json\/wp\/v2\/tags?post=2039"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}