{"id":159874,"date":"2013-10-16T09:08:56","date_gmt":"2013-10-16T09:08:56","guid":{"rendered":"http:\/\/climalife.com\/sapere-tutto-sul-rilevamento-delle-perdite\/"},"modified":"2023-12-20T11:19:47","modified_gmt":"2023-12-20T11:19:47","slug":"sapere-tutto-sul-rilevamento-delle-perdite","status":"publish","type":"post","link":"https:\/\/climalife.com\/it\/sapere-tutto-sul-rilevamento-delle-perdite\/","title":{"rendered":"Sapere tutto sul rilevamento delle perdite"},"content":{"rendered":"<p>Questo andamento \u00e8 legato al fatto che la tenuta stagna dei circuiti rimane un punto cruciale in un impianto frigorifero e che ogni sistema pu\u00f2 essere soggetto a vincoli di diverso tipo a seconda delle applicazioni.Dagli studi compiuti \u00e8 emerso chiaramente che alcuni fluidi refrigeranti hanno un impatto sullo strato di ozono. <span class=\"ui-provider hb b c d e f g h i j k l m n o p q r s t u v w x y z ab ac ae af ag ah ai aj ak\" dir=\"ltr\"><br><br><\/span><\/p>\n<p>Sono cos\u00ec stati messi al bando i CFC e gli HCFC di origine vergine. Soltanto gli HCFC rigenerati sono autorizzati in Europa fino al 31\/12\/2014.Se gli HFC e gli HFO possiedono OPD nulli e GWP inferiori ai loro predecessori, la percentuale annua di perdite di un impianto rimane un&#8217;importante fattore da considerare. Le perdite non hanno un effetto soltanto ambientale, ma anche economico sulla durata di un impianto. La F-Gas riprende in particolar modo il concetto di tenuta stagna.&nbsp;Quali possono essere le origini di una perdita di fluido refrigerante ?&nbsp; <span class=\"ui-provider hb b c d e f g h i j k l m n o p q r s t u v w x y z ab ac ae af ag ah ai aj ak\" dir=\"ltr\"><br><br><\/span><\/p>\n<p>&#8211; Vibrazioni.<br \/>\n&#8211; Variazione di temperatura e di pressione con conseguenti dilatazioni o sollecitazioni.<br \/>\n&#8211; Usura delle apparecchiature.<br \/>\n&#8211; Scelta inadeguata dei componenti.<br \/>\n&#8211; Controlli qualit\u00e0 non conformi.<br \/>\n&#8211; Incidenti.<br \/>\n&#8211; Guarnizioni.<br \/>\n&#8211; Trasferimenti.<br \/>\n&#8211; Intervento sul circuito gestito in modo errato.<br \/>\n&#8230;<span class=\"ui-provider hb b c d e f g h i j k l m n o p q r s t u v w x y z ab ac ae af ag ah ai aj ak\" dir=\"ltr\"><br><br><\/span><\/p>\n<p>Al di fuori delle situazioni accidentali, le perdite si collocano principalmente a livello delle giunzioni. In generale, le perdite sono deboli, ma possono anche risultare intermittenti, complicandone pertanto la localizzazione.<\/p>\n<h2><span style=\"color: #009cda;\">Come controllare la tenuta stagna di un impianto ?<\/span><span style=\"color: #2b66ab; font-size: medium;\"><strong><!-- [if gte mso 9]><xml>  <w:WordDocument>   <w:View>Normal<\/w:View>   <w:Zoom>0<\/w:Zoom>   <w:TrackMoves\/>   <w:TrackFormatting\/>   <w:HyphenationZone>14<\/w:HyphenationZone>   <w:PunctuationKerning\/>   <w:ValidateAgainstSchemas\/>   <w:SaveIfXMLInvalid>false<\/w:SaveIfXMLInvalid>   <w:IgnoreMixedContent>false<\/w:IgnoreMixedContent>   <w:AlwaysShowPlaceholderText>false<\/w:AlwaysShowPlaceholderText>   <w:DoNotPromoteQF\/>   <w:LidThemeOther>IT<\/w:LidThemeOther>   <w:LidThemeAsian>X-NONE<\/w:LidThemeAsian>   <w:LidThemeComplexScript>X-NONE<\/w:LidThemeComplexScript>   <w:Compatibility>    <w:BreakWrappedTables\/>    <w:SnapToGridInCell\/>    <w:WrapTextWithPunct\/>    <w:UseAsianBreakRules\/>    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Priority=\"37\" Name=\"Bibliography\"\/>   <w:LsdException Locked=\"false\" Priority=\"39\" QFormat=\"true\" Name=\"TOC Heading\"\/>  <\/w:LatentStyles> <\/xml><![endif]--><!-- [if gte mso 10]> \n\n\n\n<style>  \/* Style Definitions *\/  table.MsoNormalTable \t{mso-style-name:\"Tabella normale\"; \tmso-tstyle-rowband-size:0; \tmso-tstyle-colband-size:0; \tmso-style-noshow:yes; \tmso-style-priority:99; \tmso-style-parent:\"\"; \tmso-padding-alt:0cm 5.4pt 0cm 5.4pt; \tmso-para-margin:0cm; \tmso-para-margin-bottom:.0001pt; \tmso-pagination:widow-orphan; \tfont-size:10.0pt; \tfont-family:\"Times New Roman\",\"serif\";} <\/style>\n\n\n\n <![endif]--><\/strong><\/span><\/h2>\n<h2><span style=\"color: #2b66ab; font-size: medium;\"><strong><!-- [if gte mso 9]><xml>  <o:OfficeDocumentSettings>   <o:TargetScreenSize>800x600<\/o:TargetScreenSize>  <\/o:OfficeDocumentSettings> <\/xml><![endif]--><\/strong><\/span><\/h2>\n<p>Non affronteremo qui il capitolo DESP, ma presenteremo gli strumenti necessari al rilevamento delle perdite dopo che avere caricato e messo in funzione l&#8217;impianto.<\/p>\n<p>Per controllare la tenuta stagna del sistema sotto pressione, prima di introdurre la carica di fluido refrigerante, \u00e8 necessario mettere sotto pressione l&#8217;impianto con azoto di qualit\u00e0 frigorifera. Successivamente, con un vacuometro si procede al controllo della tenuta a vuoto dopo averlo svuotato.<\/p>\n<p><!-- [if gte mso 9]><xml>  <o:OfficeDocumentSettings>   <o:TargetScreenSize>800x600<\/o:TargetScreenSize>  <\/o:OfficeDocumentSettings> <\/xml><![endif]--><\/p>\n<p><!-- [if gte mso 9]><xml>  <w:WordDocument>   <w:View>Normal<\/w:View>   <w:Zoom>0<\/w:Zoom>   <w:TrackMoves\/>   <w:TrackFormatting\/>   <w:HyphenationZone>14<\/w:HyphenationZone>   <w:PunctuationKerning\/>   <w:ValidateAgainstSchemas\/>   <w:SaveIfXMLInvalid>false<\/w:SaveIfXMLInvalid>   <w:IgnoreMixedContent>false<\/w:IgnoreMixedContent>   <w:AlwaysShowPlaceholderText>false<\/w:AlwaysShowPlaceholderText>   <w:DoNotPromoteQF\/>   <w:LidThemeOther>IT<\/w:LidThemeOther>   <w:LidThemeAsian>X-NONE<\/w:LidThemeAsian>   <w:LidThemeComplexScript>X-NONE<\/w:LidThemeComplexScript>   <w:Compatibility>    <w:BreakWrappedTables\/>    <w:SnapToGridInCell\/>    <w:WrapTextWithPunct\/>    <w:UseAsianBreakRules\/>    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Priority=\"37\" Name=\"Bibliography\"\/>   <w:LsdException Locked=\"false\" Priority=\"39\" QFormat=\"true\" Name=\"TOC Heading\"\/>  <\/w:LatentStyles> <\/xml><![endif]--><!-- [if gte mso 10]> \n\n\n\n<style>  \/* Style Definitions *\/  table.MsoNormalTable \t{mso-style-name:\"Tabella normale\"; \tmso-tstyle-rowband-size:0; \tmso-tstyle-colband-size:0; \tmso-style-noshow:yes; \tmso-style-priority:99; \tmso-style-parent:\"\"; \tmso-padding-alt:0cm 5.4pt 0cm 5.4pt; \tmso-para-margin:0cm; \tmso-para-margin-bottom:.0001pt; \tmso-pagination:widow-orphan; \tfont-size:10.0pt; \tfont-family:\"Times New Roman\",\"serif\";} <\/style>\n\n\n\n <![endif]--><\/p>\n<h2 class=\"MsoNormal\"><\/h2>\n<h2><span style=\"color: #009cda;\">Quali sono gli strumenti per il rilevamento delle perdite di refrigerante?<\/span><\/h2>\n<p>\u2022 <span style=\"color: #333333;\"><strong>Rilevamento di bolle &#8211; prodotti schiumogeni<\/strong><\/span>:<\/p>\n<p>indicato per tutti i fluidi.<br \/>\nMetodo: nebulizzazione di una soluzione acquosa densa sulle superfici o sulle condutture da controllare. Formazione di bolle in caso di perdita.<br \/>\nLimite: metodo di scarsa precisione in caso di piccole perdite e non conforme ai requisiti normativi, ma che consente tuttavia un primo approccio.<span class=\"ui-provider hb b c d e f g h i j k l m n o p q r s t u v w x y z ab ac ae af ag ah ai aj ak\" dir=\"ltr\"><br><br><\/span><\/p>\n<p>\u2022 <span style=\"color: #333333;\"><strong>Lampada aloide<\/strong><\/span>: soltanto per i prodotti clorati come CFC o HCFC; non consente di quantificare la perdita.<br \/>\nMetodo: una fiamma riscalda una piastra di rame, facendo comparire un colore verdastro in presenza di cloro.<br \/>\nLimite: metodo poco affidabile per le perdite inferiori a 14 g\/anno. Non conforme ai requisiti normativi.<span class=\"ui-provider hb b c d e f g h i j k l m n o p q r s t u v w x y z ab ac ae af ag ah ai aj ak\" dir=\"ltr\"><br><br><\/span><\/p>\n<p>\u2022 <span style=\"color: #333333;\"><strong>Rilevamento per fluorescenza<\/strong><\/span>: per tutti i fluidi refrigeranti; consigliato in particolar modo per i circuiti chiusi e scarsamente accessibili in abbinamento ad un rilevamento elettronico. Raccomandato dalla normativa francese per gli impianti di climatizzazione automobilistica.<br \/>\nMetodo: iniezione nel circuito frigorifero di un tracciante fluorescente compatibile. In seguito ad omogeneizzazione, rilevamento visivo mediante apposita lampada UV. Le perdite appaiono sotto forma di punti fluorescenti giallo-verdi in corrispondenza della zona di fuoriuscita. Vantaggio: se conteneva gi\u00e0 il tracciante, l&#8217;impianto non deve essere ricaricato per incominciare il rilevamento delle perdite.<br \/>\nLa zona di fuoriuscita rimane visibile fino all&#8217;intervento e alla relativa pulitura in seguito alla riparazione. La localizzazione non viene disturbata da fattori esterni (correnti d&#8217;aria, ventilazione, ecc.).<br \/>\nMolto efficace in ambienti poco luminosi.<br \/>\nLimite: non \u00e8 possibile quantificare la perdita. Pi\u00f9 difficile da vedere (acuit\u00e0 visiva) in zone molto luminose. Accesso visivo indispensabile.<span class=\"ui-provider hb b c d e f g h i j k l m n o p q r s t u v w x y z ab ac ae af ag ah ai aj ak\" dir=\"ltr\"><br><br><\/span><\/p>\n<p>\u2022 <span style=\"color: #333333;\"><strong>Rilevamento elettronico a diodo riscaldato\/per ionizzazione<\/strong>:<\/span> per tutti i fluidi refrigeranti non infiammabili.<br \/>\nMetodo: scansione con sniffing nelle vicinanze della conduttura e degli elementi contenenti il fluido.<br \/>\nIn presenza di una perdita, il fluido refrigerante a contatto con la superficie calda innescher\u00e0 una reazione chimica per ionizzazione, che attiver\u00e0 l&#8217;allarme. Il flusso di corrente elettrica generato viene diretto verso un elettrodo collettore.<br \/>\nIl rilevamento per permeazione ceramica consente di raggiungere livelli di sensibilit\u00e0 ancora pi\u00f9 precisi.<span class=\"ui-provider hb b c d e f g h i j k l m n o p q r s t u v w x y z ab ac ae af ag ah ai aj ak\" dir=\"ltr\"><br><br><\/span><\/p>\n<p>\u2022 <span style=\"color: #333333;\"><strong>Rilevamento con cellula infrarossa<\/strong><\/span>: per tutti i fluidi refrigeranti.<br \/>\nMetodo: l&#8217;energia infrarossa filtrata viene modificata in presenza di fluido refrigerante nella cellula di campionamento, innescando l&#8217;allarme dell&#8217;apparecchio.<br \/>\nLimite: costo pi\u00f9 elevato.<\/p>\n<p>Esistono diversi metodi, due dei quali sono imposti dalla F-GAS:<br \/>\nRilevamento elettronico portatile con frequenza dei controlli in funzione della carica presente nell&#8217;impianto.<br \/>\nRilevatore fisso (controllore ambiente) oltre una determinata carica contenuta nell&#8217;impianto (rilevamento di una concentrazione in ppm (parti per milione).<\/p>\n<h2><\/h2>\n<h2><span style=\"color: #009cda;\">Come scegliere un rilevatore elettronico?<\/span><\/h2>\n<p>Per scegliere bene un apparecchio di rilevamento, \u00e8 necessario tenere in considerazione vari fattori, ossia:<br \/>\n\u2022 il tipo di apparecchiatura (nuova o gi\u00e0 in funzione), le sue dimensioni e il peso;<br \/>\n\u2022 il luogo di collaudo: presso il produttore o in loco;<br \/>\n\u2022 le condizioni di funzionamento dell&#8217;apparecchiatura: fluido refrigerante, pressione, temperatura;<br \/>\n\u2022 l&#8217;accessibilit\u00e0 dei punti da controllare;<br \/>\n\u2022 il fluido refrigerante da rilevare: alogenato, non organico (R-717, R-744), infiammabile, esplosivo, ecc.<\/p>\n<p>Quali sono i criteri di selezione indispensabili per gli apparecchi elettronici?<br \/>\n\u2022 Conformit\u00e0 alla norma EN 14624, che prende in considerazione la soglia di sensibilit\u00e0 in movimento e in posizione fissa, il tempo minimo di rilevamento, ecc.<br \/>\n\u2022 Funzione di taratura.<br \/>\n\u2022 Segnale acustico.<br \/>\n\u2022 Possibilit\u00e0 di eseguire un controllo di soglia annuale (obbligo F-Gas).<span class=\"ui-provider hb b c d e f g h i j k l m n o p q r s t u v w x y z ab ac ae af ag ah ai aj ak\" dir=\"ltr\"><br><br><\/span><\/p>\n<p>Consiglio:<br \/>\n\u00c8 opportuno cambiare di frequente i filtri, le pile e il sensore per preservare la capacit\u00e0 di rilevamento dell&#8217;apparecchio.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dallo 0,5 al 20% circa del fluido refrigerante prodotto viene impiegato per eseguire rabbocchi negli impianti esistenti. <\/p>\n","protected":false},"author":36,"featured_media":135738,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9175,13613],"tags":[],"product_cat":[],"class_list":["post-159874","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-documenti-tecnici","category-rilevamento-perdite-it"],"_links":{"self":[{"href":"https:\/\/climalife.com\/it\/wp-json\/wp\/v2\/posts\/159874","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/climalife.com\/it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/climalife.com\/it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/climalife.com\/it\/wp-json\/wp\/v2\/users\/36"}],"replies":[{"embeddable":true,"href":"https:\/\/climalife.com\/it\/wp-json\/wp\/v2\/comments?post=159874"}],"version-history":[{"count":5,"href":"https:\/\/climalife.com\/it\/wp-json\/wp\/v2\/posts\/159874\/revisions"}],"predecessor-version":[{"id":213486,"href":"https:\/\/climalife.com\/it\/wp-json\/wp\/v2\/posts\/159874\/revisions\/213486"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/climalife.com\/it\/wp-json\/wp\/v2\/media\/135738"}],"wp:attachment":[{"href":"https:\/\/climalife.com\/it\/wp-json\/wp\/v2\/media?parent=159874"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/climalife.com\/it\/wp-json\/wp\/v2\/categories?post=159874"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/climalife.com\/it\/wp-json\/wp\/v2\/tags?post=159874"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/climalife.com\/it\/wp-json\/wp\/v2\/product_cat?post=159874"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}