{"id":13095,"date":"2022-06-30T14:00:00","date_gmt":"2022-06-30T12:00:00","guid":{"rendered":"https:\/\/rdcomponents.com\/site\/?p=13095"},"modified":"2025-07-28T12:23:24","modified_gmt":"2025-07-28T10:23:24","slug":"41-inerzia-termica","status":"publish","type":"post","link":"https:\/\/rdcomponents.com\/site\/2022\/06\/30\/41-inerzia-termica\/","title":{"rendered":"#41 – Inerzia termica"},"content":{"rendered":"\n
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Oggi prendiamo in esame il caso in cui la temperatura supera la soglia d\u2019intervento del termostato, o del protettore termico, o anche del termofusibile. Per comodit\u00e0 di narrazione da qui in poi li chiameremo \u201cdisgiuntori\u201d.<\/p>\n\n\n\n

Quando la temperatura aumenta e arriva alla soglia per cui il nostro dispositivo \u00e8 stato costruito, questo interviene aprendo il circuito e di conseguenza bloccando il passaggio di corrente, ma per\u00a0inerzia\u00a0la temperatura continua a salire. Ne abbiamo fatto cenno anche in \u201c\u201d. Questo \u00e8 un fenomeno fisiologico che si verifica ogni volta che il disgiuntore\u00a0termico\u00a0interviene. A seconda della rapidit\u00e0 con la quale la temperatura sale, e del momento in cui abbiamo l\u2019intervento, avremo una maggiore o una minore\u00a0inerzia\u00a0termica.<\/p>\n\n\n\n

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\"inerzia\"<\/figure>\n<\/div>\n\n\n
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Inerzia termica nelle varie tipologie di disgiuntori<\/h2>\n\n\n\n

Quello che un ufficio tecnico deve tenere in considerazione nel momento in cui sviluppa un progetto, sono le conseguenze che questo incontrollato e temporaneo aumento di temperatura pu\u00f2 avere sia sull\u2019ambiente interno che sul disgiuntore.<\/p>\n\n\n\n

Si deve innanzitutto considerare in quanto tempo la temperatura raggiunger\u00e0 la soglia d\u2019intervento, e questo varia da applicazione ad applicazione. Successivamente considerare i materiali che compongono la superficie dove il disgiuntore verr\u00e0 alloggiato e quali sono le massime temperature che possono sostenere.<\/p>\n\n\n\n

Le inerzie\u00a0termiche\u00a0spesso sono causa di malfunzionamenti dei\u00a0termofusibili<\/strong><\/a>, che sono organi di sicurezza.<\/p>\n\n\n\n

Proprio in questo caso \u00e8 importante che non si raggiunga mai la temperatura massima Tm, come descritto in \u201cCome funzionano i termofusibili<\/strong><\/a>\u201d. Ma ancor pi\u00f9 importante \u00e8 non raggiungere con le inerzie\u00a0termiche\u00a0le temperature di Th, che determinano l\u2019invecchiamento precoce del termofusibile.<\/p>\n\n\n\n

Se invece l\u2019inerzia\u00a0termica\u00a0dovesse addirittura superare il Th allora inizierebbe a ridurre lo spessore solido del thermal pellet, con tutte le conseguenze descritte in \u201cTermofusibile: cosa pu\u00f2 succedere se TH \u00e8 troppo vicino a TF?<\/strong><\/a>\u201d.<\/p>\n\n\n\n

Passando ad altri dispositivi, nel caso dei\u00a0termostati a bulbo<\/strong><\/a>, una forte\u00a0inerzia\u00a0termica\u00a0pu\u00f2 determinare la rottura della membrana interna dei contatti della valvola, descritta in \u201cTermostati a bulbo<\/strong><\/a>\u201d, rendendo il termostato inutilizzabile.<\/p>\n\n\n\n

Per gli altri tipi di disgiuntori, vale a dire i\u00a0protettori\u00a0termici<\/strong><\/a>\u00a0e i\u00a0Termostati bimetallici<\/strong><\/a>, bisogna semplicemente assicurarsi che l\u2019inerzia\u00a0termica\u00a0non vada oltre certe temperature note che potrebbero deteriorare i materiali con cui sono realizzati i dispositivi, come si spiegava in \u201cTemperatura ambiente<\/strong><\/a>\u201d.\u00a0<\/p>\n\n\n\n

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Scarica l’articolo in versione stampabile cliccando qui sotto!<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n

41-INERZIA-TERMICA-1<\/a>Download<\/a><\/div>\n\n\n\n
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<\/p>\n","protected":false},"excerpt":{"rendered":"

Oggi prendiamo in esame il caso in cui la temperatura supera la soglia d\u2019intervento del termostato, o del protettore termico, o anche del termofusibile. Per comodit\u00e0 di narrazione da qui in poi li chiameremo \u201cdisgiuntori\u201d. Quando la temperatura aumenta e arriva alla soglia per cui il…<\/p>\n","protected":false},"author":2,"featured_media":13096,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[239],"tags":[220,221,219,154],"class_list":["post-13095","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-funzionamento-tecnico","tag-componenti","tag-disgiuntori","tag-inerzia-termica","tag-temperatura"],"yoast_head":"\n#41 - Inerzia termica -<\/title>\n<meta name=\"description\" content=\"Approfondiamo oggi il concetto di inerzia termica: come funziona, quali sono i rischi e come si comportano i vari componenti\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/rdcomponents.com\/site\/2022\/06\/30\/41-inerzia-termica\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" 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Ferranti","author_link":"https:\/\/rdcomponents.com\/site\/author\/roberto\/"},"rttpg_comment":0,"rttpg_category":"<a href=\"https:\/\/rdcomponents.com\/site\/category\/funzionamento-tecnico\/\" rel=\"category tag\">Funzionamento tecnico<\/a>","rttpg_excerpt":"Oggi prendiamo in esame il caso in cui la temperatura supera la soglia d\u2019intervento del termostato, o del protettore termico, o anche del termofusibile. Per comodit\u00e0 di narrazione da qui in poi li chiameremo \u201cdisgiuntori\u201d. Quando la temperatura aumenta e arriva alla soglia per cui il...","_links":{"self":[{"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/posts\/13095","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/comments?post=13095"}],"version-history":[{"count":0,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/posts\/13095\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/media\/13096"}],"wp:attachment":[{"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/media?parent=13095"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/categories?post=13095"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/tags?post=13095"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}