{"id":47,"date":"2018-11-08T12:14:02","date_gmt":"2018-11-08T03:14:02","guid":{"rendered":"https:\/\/thermoelectric-coolers.com\/sv\/?page_id=47"},"modified":"2023-02-22T12:05:14","modified_gmt":"2023-02-22T03:05:14","slug":"choice","status":"publish","type":"page","link":"https:\/\/thermoelectric-coolers.com\/sv\/technical\/choice\/","title":{"rendered":"V\u00e4lja r\u00e4tt"},"content":{"rendered":"
\n

Ber\u00e4kna v\u00e4rmebelastningen<\/h2>\n

F\u00f6r att ber\u00e4kna \u201dhur mycket v\u00e4rme som ska f\u00f6ras bort\u201d n\u00e4r kylobjektet ska kylas. Den v\u00e4rme som frig\u00f6rs fr\u00e5n kylobjektet r\u00e4knas i allm\u00e4nhet inte in, och det g\u00e5r bra att bara ta h\u00e4nsyn till \u201dden v\u00e4rme fr\u00e5n omgivningen som kommer in i kylobjektet\u201d.<\/p>\n

A. F\u00f6r att kyla ett utrymme, som ett kylsk\u00e5p<\/h3>\n

Eftersom det \u00e4r ett slutet utrymme kan v\u00e4rmemotst\u00e5ndet ber\u00e4knas utifr\u00e5n v\u00e4rmeledningsf\u00f6rm\u00e5gan och isoleringens tjocklek.<\/p>\n

B. Ett objekt utan isolering (kan inte l\u00e4ggas till)<\/h3>\n

Ber\u00e4kna konvektionell v\u00e4rmeledningsf\u00f6rm\u00e5ga fr\u00e5n ytan p\u00e5 kylobjektet.<\/p>\n

C. F\u00f6r att kyla en v\u00e4tska (v\u00e4tska eller gas)<\/h3>\n

Den n\u00f6dv\u00e4ndiga v\u00e4rmeavledningen f\u00f6r kylning fr\u00e5n temperaturen vid inloppet till temperaturen vid utloppet under den best\u00e4mda perioden (fl\u00f6deshastighet) kan ber\u00e4knas med hj\u00e4lp av produkten av v\u00e4tskans specifika v\u00e4rmedensitet, fl\u00f6deshastighet och temperaturskillnad. Beroende p\u00e5 fl\u00f6deshastigheten kan det beh\u00f6vas en mycket st\u00f6rre kyleffekt \u00e4n den som en termoelektrisk kylare (modul) realistiskt sett kan uppn\u00e5. Dessutom kommer omgivande v\u00e4rme att komma in i kylv\u00e4tskan vid halva slangstr\u00e4ckan, s\u00e5 ta \u00e4ven h\u00e4nsyn till den sista punkten (B).<\/p>\n<\/section>\n

\n

Effektivitet<\/h2>\n

Den termoelektriska modulen \u00e4r ocks\u00e5 energieffektiv, vilket definieras som COP (Coefficient Of Performance). Baserat p\u00e5 hur mycket el (P) du matar in i kylaren och hur mycket arbete den faktiskt utf\u00f6rt (=v\u00e4rmeabsorption Q), vilket \u00e4r (Q \/ P). Detta v\u00e4rde f\u00f6r termoelektriska kylare \u00e4r dock mycket litet, till exempel \u00e4r v\u00e4rdet f\u00f6r ett kompakt kylsk\u00e5p (i allm\u00e4nhet) ungef\u00e4r 0,2.<\/p>\n

Det maximala v\u00e4rdet f\u00f6r prestandakoefficienten (COPmax) best\u00e4ms av str\u00f6mmen och temperaturskillnaden. Det \u00e4r dock inte m\u00f6jligt att uppn\u00e5 maximal COP vid sm\u00e5 str\u00f6mv\u00e4rden och temperaturskillnader. I verkliga till\u00e4mpningar kommer en stor temperaturskillnad att leda till att v\u00e4rmeabsorptionen ocks\u00e5 \u00f6kar. Det \u00e4r d\u00e4rf\u00f6r inte n\u00f6dv\u00e4ndigt att bry sig om den maximala effektiviteten (COPmax), men f\u00f6r att \u00f6ka COP lite \u00e4r det mycket viktigt att \u201dh\u00f6ja v\u00e4rmev\u00e4xlingsf\u00f6rm\u00e5gan\u201d p\u00e5 b\u00e5da sidor av den termoelektriska modulen.<\/p>\n<\/section>\n

\n

Val<\/h2>\n

V\u00e4lj en termoelektrisk modul utifr\u00e5n den kylkapacitet du beh\u00f6ver. Du kan anv\u00e4nda den maximala v\u00e4rmeabsorptionen som en v\u00e4gledning, men under realistiska f\u00f6rh\u00e5llanden med st\u00f6rre temperaturskillnader och mindre v\u00e4rmeabsorption \u00e4r cirka 10\u201330 % av den maximala v\u00e4rmeabsorptionen det vanligaste. I verkliga situationer m\u00e5ste du ta h\u00e4nsyn till driftssp\u00e4nningen och modulstorleken osv., se prestandadiagrammet f\u00f6r att v\u00e4lja r\u00e4tt.<\/p>\n

Om till\u00e4mpningen kr\u00e4ver liten v\u00e4rmeabsorption och stor temperaturskillnad \u00e4r kaskadmodellen (med flera steg) ett alternativ. Anv\u00e4nd f\u00f6ljande maximala temperaturskillnad som en v\u00e4gledning. Om den interna temperaturskillnaden i en allm\u00e4n termoelektrisk modul \u00e4r omkring 50 \u00b0C \u00e4r det ett bra val att anv\u00e4nda en enstegsmodul.<\/p>\n\n\n\n\n\n\n
Den maximala temperaturskillnaden (Th = 27 \u00b0C)<\/th>\n<\/tr>\n<\/thead>\n
Termoelektrisk enstegsmodul<\/td>\n68~70\u00b0C<\/td>\nFPH1\/FPM1-serien<\/td>\n<\/tr>\n
Termoelektrisk tv\u00e5stegsmodul<\/td>\n85~95\u00b0C<\/td>\nFPK2-serien<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Ber\u00e4kna v\u00e4rmebelastningen F\u00f6r att ber\u00e4kna \u201dhur mycket v\u00e4rme som ska f\u00f6ras bort\u201d n\u00e4r kylobjektet ska kylas. Den […]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":36,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-47","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"\nV\u00e4lja r\u00e4tt | Z-MAX Termoelektrisk kylare och Peltier module<\/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:\/\/thermoelectric-coolers.com\/sv\/technical\/choice\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"V\u00e4lja r\u00e4tt | Z-MAX Termoelektrisk kylare och Peltier module\" \/>\n<meta property=\"og:description\" content=\"Ber\u00e4kna v\u00e4rmebelastningen F\u00f6r att ber\u00e4kna \u201dhur mycket v\u00e4rme som ska f\u00f6ras bort\u201d n\u00e4r kylobjektet ska kylas. 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