{"id":532,"date":"2017-10-25T11:57:11","date_gmt":"2017-10-25T10:57:11","guid":{"rendered":"https:\/\/diarieducacio.cat\/extra\/?p=532"},"modified":"2024-08-08T23:17:20","modified_gmt":"2024-08-08T21:17:20","slug":"aprenent-in-situ-genera-llum","status":"publish","type":"post","link":"https:\/\/diarieducacio.cat\/extra\/2017\/10\/25\/aprenent-in-situ-genera-llum\/","title":{"rendered":"Aprenent &#8216;in situ&#8217; com es genera la llum"},"content":{"rendered":"<p>Accedim a la Central T\u00e8rmica de Cicle Combinat del Bes\u00f2s, inaugurada l\u2019any 2002 i propietat de la companyia Endesa. Hi hem entrat incrustats en un grup de primer de batxillerat tecnol\u00f2gic de l\u2019Institut Torrent de les Bruixes de Santa Coloma de Gramanet, el qual, ens explica el seu professor, David de Pablo, aquests dies est\u00e0 estudiant els diversos tipus de centrals el\u00e8ctriques que existeixen. \u201cPoder visitar aquesta central ens va molt b\u00e9, per proximitat, perqu\u00e8 ho estan estudiant i perqu\u00e8 aix\u00f2 \u00e9s una instal\u00b7laci\u00f3 industrial, o sigui que hi ha aspectes que treballaran m\u00e9s endavant per\u00f2 que ara ja hauran vist\u201d, comenta de Pablo.<\/p>\n<p>La visita comen\u00e7a amb una xerrada inicial, d\u2019uns trenta minuts, a c\u00e0rrec de Justi, l\u2019educadora d\u2019Endesa que ens far\u00e0 de guia durant les prop de dues hores que durar\u00e0. \u00c9s com una classe normal, encara que segurament m\u00e9s distesa i amb una professora accidental i molt preguntona. De seguida es nota que els alumnes porten treballada la mat\u00e8ria, mentre que l\u2019element incrustat no rasca bola. Cap al final el profe m\u2019explicar\u00e0 que havien quedat amb el grup (no gaire nombr\u00f3s, una dotzena d\u2019alumnes, la majoria nois) que tothom faria com a m\u00ednim una pregunta a la Justi, per\u00f2 que no tots hauran complert aquest comprom\u00eds.<\/p>\n<p>L\u2019educadora ens relata totes les virtuts de la planta, comen\u00e7ant pel fet que t\u00e9 dues fonts d\u2019energia: el gas, amb el qual es mouen dues turbines, i el vapor, amb el qual si ho entenc b\u00e9 es mou una tercera, i que es genera a partir de la captaci\u00f3 d\u2019aigua del mar i la calor sobrant produ\u00efda pel gas. L\u2019aigua del mar no \u00e9s succionada com es feia abans sin\u00f3 que entra de forma natural, detall ambiental que repeteix diversos cops. Tamb\u00e9 insisteix que \u201caix\u00f2 \u00e9s un circuit tancat\u201d, o sigui que anoto la idea per si surt a l\u2019examen.<\/p>\n<p>Repassem algun concepte de qu\u00edmica (qu\u00e8 passa amb l\u2019aigua en el proc\u00e9s de dessalaci\u00f3 que es dona entre que arriba del mar i entra a la caldera on es genera el vapor?) i molts de f\u00edsica (de quin material est\u00e0 recobert el rotor de la turbina gr\u00e0cies al qual es genera el corrent el\u00e8ctric?). En definitiva, mat\u00e8ries del saber en les que l\u2019element incrustat es perd m\u00e9s del que ho faria la nit d\u2019un dissabte a Bombai. Ho confirma quan la Justi demana al grup sobre el fenomen que es produeix quan l\u2019energia transportada per alta tensi\u00f3 passa a mitja tensi\u00f3 (o alguna cosa per l\u2019estil) i uns quants dels presents salten dient que \u00e9s l\u2019efecte Joule, que pel que sembla era la resposta correcta.<\/p>\n<figure id=\"attachment_539\" aria-describedby=\"caption-attachment-539\" style=\"width: 1189px\" class=\"wp-caption alignnone\"><img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-539 size-full\" src=\"https:\/\/nostalgic-ishizaka.82-223-1-47.plesk.page\/extra\/wp-content\/uploads\/sites\/25\/2017\/10\/unnamed-1.jpg\" alt=\"\" width=\"1189\" height=\"840\" \/><figcaption id=\"caption-attachment-539\" class=\"wp-caption-text\">La piscina de decantaci\u00f3. Al fons, les tres xemeneies de l&#8217;antiga central.<\/figcaption><\/figure>\n<p>Acabada la classe te\u00f2rica, ens calcem el casc, l\u2019armilla i uns auriculars (de seguida comprovarem que, malgrat no som gaires, fan molta falta), rebem alguns consells de seguretat, i ens disposem a entrar en acci\u00f3. Fem primer un recorregut per l\u2019exterior, per on rebem tota mena d\u2019explicacions sobre el que transporten les canonades de diverses formes i colors que entren i surten per tota arreu, fins que accedim per unes escales a la sala de turbines. Som a les entranyes de la b\u00e8stia. \u201cHaviem vist dibuixos i fotografies de les turbines, per\u00f2 no imaginava que fossin tan grans\u201d, comenta el David, un dels alumnes m\u00e9s participatius. Les de gas s\u00f3n dins de dues enormes cuirasses d\u2019acer que veiem a mitja dist\u00e0ncia, mentre que passem pel costat de la de vapor, tamb\u00e9 enorme per\u00f2 amb una forma m\u00e9s recognoscible, i que ning\u00fa toca perqu\u00e8 ens han dit que no toquem res.<\/p>\n<p>Tornem a l\u2019exterior per apropar-nos a les piscines de decantaci\u00f3, per on torna al mar l\u2019aigua que s\u2019usa per refrigerar la central, que no \u00e9s la mateixa que s\u2019usa per al vapor. Des d\u2019all\u00e0 tornem a veure les omnipresents tres xemeneies de l\u2019antiga central el\u00e8ctrica de l\u2019altra banda del riu, tancada ja fa uns anys i que la gent de Sant Adri\u00e0 del Bes\u00f3s va amnistiar en votaci\u00f3 popular. La Justi ens fa mirar ara les xemeneies de la nova planta perqu\u00e8 constatem que a penes surt fum, malgrat que fa una estona hem constatat que les turbines estan a un alt rendiment, i torna a dir all\u00f2 de que aix\u00f2 \u00e9s un circuit tancat. Tamb\u00e9 ens fa notar que durant tota la visita pr\u00e0cticament no hem vist operaris, perqu\u00e8 est\u00e0 tot molt automatitzat, i ens demana que ens fixem en l\u2019abs\u00e8ncia de rovell als elements met\u00e0l\u00b7lics exteriors malgrat la proximitat amb el mar, fruit d\u2019un acurat manteniment.<\/p>\n<p>L\u2019\u00faltima aturada \u00e9s a la sala de control, l\u2019\u00fanic punt on no es poden fer fotografies, imagino que per no emprenyar la gent que hi treballa. Una sala plena de pantalles excepte un curi\u00f3s taulell amb polsadors i interruptors que serveixen per aturar la central manualment en cas que caigu\u00e9s el sistema inform\u00e0tic. Un dels t\u00e8cnics ens explica com es decideix la pot\u00e8ncia el\u00e8ctrica que emet la central en tot moment, i com aquesta planta \u00e9s especialment flexible a l\u2019hora de augmentar-la o rebaixar-la molt r\u00e0pidament. A banda, dona molts m\u00e9s detalls sobre el funcionament del mercat el\u00e8ctric espanyol que l\u2019element incrustat \u00e9s incapa\u00e7 de retenir.<\/p>\n<p>Hem acabat la visita per\u00f2 els estudiants encara tenen feina. \u201cAra hem de fer el tancament\u201d, em comenta el professor De Pablo. \u201cA banda de les explicacions que jo els vaig donar a classe \u2013afegeix\u2013, els alumnes han hagut de fer una activitat pr\u00e8via que tamb\u00e9 ens proporciona Endesa, i ara estan preparant cadasc\u00fa una presentaci\u00f3 sobre un tipus de central el\u00e8ctrica, que poden fer amb el format que vulguin i on han d\u2019incorporar un q\u00fcestionari que es passar\u00e0 als seus companys per veure si realment s\u2019ha ent\u00e8s o no el que han explicat\u201d. En total, la unitat did\u00e0ctica sobre generaci\u00f3 el\u00e8ctrica haur\u00e0 durat unes 16 hores, per\u00f2 la visita d\u2019avui, afirma el profe, s\u2019aprofitar\u00e0 en altres unitats did\u00e0ctiques, \u201ccom per exemple quan parlem de les m\u00e0quines t\u00e8rmiques, ja que els principis de les turbines de gas \u00e9s molt similar al dels motors dels avions\u201d.<\/p>\n<p>Aquesta \u00e9s una m\u00e9s de les activitats que desenvolupa la Fundaci\u00f3n Endesa a trav\u00e9s del programa Endesa Educa i que ofereix als centres educatius a fi de fomentar \u201cun \u00fas eficient i racional de l\u2019electricitat i promoure la presa de consci\u00e8ncia sobre el valor de l\u2019energia per a una millor qualitat de vida\u201d. Segons la Fundaci\u00f3n Endesa, el curs passat Endesa Educa a Catalunya va organitzar 609 activitats, en les que van prendre part m\u00e9s de 15.500 alumnes, aproximadament la meitat de prim\u00e0ria i la resta de secund\u00e0ria, batxillerat, cicles formatius, educaci\u00f3 especial i adults. En el cas de la visita a la central del Bes\u00f2s, est\u00e0 prevista sobretot per alumnes de segon cicle de la ESO, batxillerat i cicles formatius.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Visitem la Central Termoel\u00e8ctrica de Cicle Combinat del Bes\u00f2s amb uns alumnes de primer de batxillerat de Santa Coloma, una de les moltes activitats del programa Endesa Educa<\/p>\n","protected":false},"author":289,"featured_media":533,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"tipo":[],"class_list":{"0":"post-532","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-general"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Aprenent &#039;in situ&#039; com es genera la llum - Extra Educaci\u00f3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/diarieducacio.cat\/extra\/2017\/10\/25\/aprenent-in-situ-genera-llum\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Aprenent &#039;in situ&#039; 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