{"id":32661,"date":"2019-10-31T21:48:16","date_gmt":"2019-10-31T18:48:16","guid":{"rendered":"https:\/\/prohoster.info\/blog\/chillernoe-ohlazhdenie-tsod-kakoj-teplonositel-vybrat\/"},"modified":"2019-10-31T21:48:16","modified_gmt":"2019-10-31T18:48:16","slug":"chillernoe-ohlazhdenie-tsod-kakoj-teplonositel-vybrat","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/administrirovanie\/chillernoe-ohlazhdenie-tsod-kakoj-teplonositel-vybrat","title":{"rendered":"Chladic\u00ed syst\u00e9my datov\u00fdch center: jak\u00fd chladic\u00ed m\u00e9dium zvolit?","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Pro klimatizaci v datov\u00fdch centrech se nej\u010dast\u011bji instaluj\u00ed centralizovan\u00e9 v\u00edcestup\u0148ov\u00e9 syst\u00e9my s vodn\u00edmi chladic\u00edmi stroji (chillery). Ty jsou \u00fa\u010dinn\u011bj\u0161\u00ed ne\u017e chladi\u010de s freonem, proto\u017ee cirkuluj\u00edc\u00ed chladivo mezi venkovn\u00edmi a vnit\u0159n\u00edmi jednotkami nep\u0159ech\u00e1z\u00ed do plynn\u00e9ho stavu a kompresorov\u00fd kondenz\u00e1tor chilleru se aktivuje pouze p\u0159i zv\u00fd\u0161en\u00ed teploty na ur\u010ditou \u00farove\u0148. Jednou z nejd\u016fle\u017eit\u011bj\u0161\u00edch ot\u00e1zek p\u0159i projektov\u00e1n\u00ed chladic\u00edho syst\u00e9mu je: jak\u00fd chladic\u00ed m\u00e9dium je lep\u0161\u00ed pou\u017e\u00edt? M\u016f\u017ee to b\u00fdt voda nebo vodn\u00ed roztok polyalkohol\u016f \u2013 propylenglykolu nebo etylenglykolu. Pokus\u00edme se objasnit v\u00fdhody a nev\u00fdhody ka\u017ed\u00e9 varianty.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h2>Fyzika a chemie<\/h2>\n<p><\/p>\n<p>Z hlediska fyzik\u00e1ln\u00edch vlastnost\u00ed (tepeln\u00e1 kapacita, hustota, kinematick\u00e1 viskozita) je voda pova\u017eov\u00e1na za optim\u00e1ln\u00ed chladic\u00ed m\u00e9dium. Nav\u00edc ji lze bez probl\u00e9m\u016f vypou\u0161t\u011bt do zem\u011b nebo do kanalizace. Bohu\u017eel, v na\u0161ich zem\u011bpisn\u00fdch \u0161\u00ed\u0159k\u00e1ch se voda pou\u017e\u00edv\u00e1 pouze uvnit\u0159 budov, proto\u017ee p\u0159i 0 \u00b0C zamrz\u00e1. Hustota chladiva se t\u00edmto zp\u016fsobem sni\u017euje a objem, kter\u00fd zauj\u00edm\u00e1, roste. Proces prob\u00edh\u00e1 nerovnom\u011brn\u011b, nelze jej kompenzovat pomoc\u00ed expanzn\u00ed n\u00e1doby. Oblasti zamrz\u00e1n\u00ed se izoluj\u00ed, statick\u00fd tlak na st\u011bn\u00e1ch trubek se zvy\u0161uje, a nakonec dojde k prasknut\u00ed. Vodn\u00ed roztoky polyalkohol\u016f tyto nedostatky postr\u00e1daj\u00ed. Zamrzaj\u00ed p\u0159i mnohem ni\u017e\u0161\u00edch teplot\u00e1ch, ani\u017e by vytv\u00e1\u0159ely m\u00edstn\u00ed lo\u017eiska. Jejich hustota se v procesu krystalizace sni\u017euje mnohem m\u00e9n\u011b ne\u017e p\u0159i p\u0159em\u011bn\u011b vody na led, co\u017e znamen\u00e1, \u017ee objem se nezvy\u0161uje tak v\u00fdrazn\u011b \u2013 i zmrzl\u00e9 vodn\u00ed roztoky glykolu netrhaj\u00ed trubky.<\/p>\n<p><\/p>\n<p>Z\u00e1kazn\u00edci \u010dasto vol\u00ed propylenglykol, proto\u017ee nen\u00ed toxick\u00fd. V podstat\u011b se jedn\u00e1 o povolenou potravinovou p\u0159\u00edsadu E1520, kter\u00e1 se pou\u017e\u00edv\u00e1 p\u0159i pe\u010den\u00ed a v dal\u0161\u00edch potravin\u00e1ch jako zadr\u017eova\u010d vlhkosti. Pou\u017e\u00edv\u00e1 se v kosmetick\u00fdch prost\u0159edc\u00edch a na mnoha dal\u0161\u00edch m\u00edstech. Pokud je syst\u00e9m napln\u011bn vodn\u00fdm roztokem propylenglykolu, nejsou zapot\u0159eb\u00ed \u017e\u00e1dn\u00e1 zvl\u00e1\u0161tn\u00ed bezpe\u010dnostn\u00ed opat\u0159en\u00ed: z\u00e1kazn\u00edk pot\u0159ebuje pouze dal\u0161\u00ed n\u00e1dr\u017e pro kompenzaci \u00fanik\u016f. Pr\u00e1ce s etylenglykolem je slo\u017eit\u011bj\u0161\u00ed \u2013 tato l\u00e1tka pat\u0159\u00ed mezi m\u00edrn\u011b toxick\u00e9 (t\u0159et\u00ed t\u0159\u00edda nebezpe\u010d\u00ed). Jeho maxim\u00e1ln\u00ed p\u0159\u00edpustn\u00e1 koncentrace v ovzdu\u0161\u00ed \u010din\u00ed 5 mg\/m3, ale kv\u016fli n\u00edzk\u00e9 t\u011bkavosti p\u0159i norm\u00e1ln\u00ed teplot\u011b se t\u00edmto v\u00edcenoatomov\u00fdm alkoholem m\u016f\u017ee otr\u00e1vit pouze v p\u0159\u00edpad\u011b, \u017ee se j\u00edm d\u00fdch\u00e1 dlouho.<\/p>\n<p><\/p>\n<p>Nejhor\u0161\u00ed situace nast\u00e1v\u00e1 u odpadn\u00edch vod: voda a propylenglykol nevy\u017eaduj\u00ed likvidaci, av\u0161ak koncentrace etylenglykolu v objektech pro obecn\u00e9 u\u017e\u00edv\u00e1n\u00ed vody by nem\u011bla p\u0159ekra\u010dovat 1 mg\/l. To znamen\u00e1, \u017ee vlastn\u00edci datov\u00fdch center budou muset do rozpo\u010dtu zahrnout speci\u00e1ln\u00ed vypou\u0161t\u011bc\u00ed syst\u00e9my, izolovan\u00e9 n\u00e1dr\u017ee a\/nebo syst\u00e9my na \u0159ed\u011bn\u00ed odv\u00e1d\u011bn\u00e9ho chladic\u00edho m\u00e9dia vodou: prost\u011b jej nelze vypustit do kanalizace. Mno\u017estv\u00ed vody pot\u0159ebn\u00e9 k \u0159ed\u011bn\u00ed je stokr\u00e1t v\u011bt\u0161\u00ed ne\u017e mno\u017estv\u00ed chladic\u00edho m\u00e9dia, a je velmi ne\u017e\u00e1douc\u00ed jej prol\u00e9vat na p\u016fdu nebo na podlahu \u2013 toxick\u00fd v\u00edcenoatomov\u00fd alkohol je t\u0159eba spl\u00e1chnout velk\u00fdm mno\u017estv\u00edm vody. Nicm\u00e9n\u011b pou\u017eit\u00ed etylenglykolu v modern\u00edch klimatiza\u010dn\u00edch syst\u00e9mech pro <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/cs\/kompaniya\/data-centers\/\"   title=\"datov\u00e1 centra\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"4646\">datov\u00e1 centra<\/a> tak\u00e9 je zcela bezpe\u010dn\u00e9 p\u0159i dodr\u017een\u00ed v\u0161ech pot\u0159ebn\u00fdch bezpe\u010dnostn\u00edch opat\u0159en\u00ed.<\/p>\n<p><\/p>\n<h2>Ekonomika<\/h2>\n<p><\/p>\n<p>Voda se d\u00e1 pova\u017eovat za t\u00e9m\u011b\u0159 bezplatnou ve srovn\u00e1n\u00ed s n\u00e1klady na tepeln\u00e1 m\u00e9dia na b\u00e1zi polyalkohol\u016f. Vodn\u00fd roztok propylenglykolu pro syst\u00e9m chladic\u00edho za\u0159\u00edzen\u00ed fan-coil je docela drah\u00fd \u2013 stoj\u00ed p\u0159ibli\u017en\u011b 80 korun za litr. S ohledem na nutnost pravideln\u00e9 v\u00fdm\u011bny tepeln\u00e9ho m\u00e9dia to vyjde na zna\u010dn\u00e9 \u010d\u00e1stky. Cena vodn\u00e9ho roztoku etylenglykolu je t\u00e9m\u011b\u0159 dvakr\u00e1t ni\u017e\u0161\u00ed, ale s t\u00edm je t\u0159eba do rozpo\u010dtu zahrnout i n\u00e1klady na odstran\u011bn\u00ed, kter\u00e9 jsou tak\u00e9, v\u0161ak relativn\u011b mal\u00e9. Existuj\u00ed nuansy t\u00fdkaj\u00edc\u00ed se viskozity a m\u011brn\u00e9 tepeln\u00e9 kapacity: tepeln\u00e9 m\u00e9dium na b\u00e1zi propylenglykolu vy\u017eaduje vy\u0161\u0161\u00ed tlak vytv\u00e1\u0159en\u00fd cirkula\u010dn\u00edm \u010derpadlem. Celkov\u011b jsou n\u00e1klady na provoz syst\u00e9mu s etylenglykolem v\u00fdrazn\u011b ni\u017e\u0161\u00ed, tak\u017ee tuto variantu \u010dasto vol\u00ed, navzdory ur\u010dit\u00e9 toxicit\u011b tepeln\u00e9ho m\u00e9dia. Dal\u0161\u00ed variantou sni\u017eov\u00e1n\u00ed n\u00e1klad\u016f je pou\u017eit\u00ed dvoucirkula\u010dn\u00edho syst\u00e9mu s v\u00fdm\u011bn\u00edkem tepla, kdy vnit\u0159n\u00edch prostor\u00e1ch s pozitivn\u00ed teplotou cirkuluje oby\u010dejn\u00e1 voda, zat\u00edmco venku p\u0159en\u00e1\u0161\u00ed teplo nemrz\u00edc\u00ed glykolov\u00fd roztok. \u00da\u010dinnost takov\u00e9ho syst\u00e9mu je o n\u011bco ni\u017e\u0161\u00ed, ale objemy drah\u00e9ho tepeln\u00e9ho m\u00e9dia se v\u00fdrazn\u011b zmen\u0161uj\u00ed.<\/p>\n<p><\/p>\n<h2>Z\u00e1v\u011bry<\/h2>\n<p><\/p>\n<p>Ve skute\u010dnosti maj\u00ed v\u0161echny uveden\u00e9 mo\u017enosti chladic\u00edch syst\u00e9m\u016f (krom\u011b \u010dist\u011b vodn\u00edch, kter\u00e9 jsou v na\u0161ich \u0161\u00ed\u0159k\u00e1ch nemo\u017en\u00e9) pr\u00e1vo na existenci. V\u00fdb\u011br z\u00e1vis\u00ed na celkov\u00fdch n\u00e1kladech na vlastnictv\u00ed, kter\u00e9 je t\u0159eba vypo\u010d\u00edtat v ka\u017ed\u00e9m konkr\u00e9tn\u00edm p\u0159\u00edpad\u011b ji\u017e ve f\u00e1zi projektov\u00e1n\u00ed. Jedin\u00e9, co by se v \u017e\u00e1dn\u00e9m p\u0159\u00edpad\u011b nem\u011blo d\u011blat: m\u011bnit koncepci, kdy\u017e je projekt t\u00e9m\u011b\u0159 hotov\u00fd. T\u00edm sp\u00ed\u0161e nen\u00ed mo\u017en\u00e9 zm\u011bnit chlad\u00edc\u00ed m\u00e9dium, kdy\u017e ji\u017e prob\u00edh\u00e1 mont\u00e1\u017e in\u017een\u00fdrsk\u00fdch syst\u00e9m\u016f budouc\u00ed datacentra. Rozpory a obavy se projev\u00ed v zna\u010dn\u00fdch n\u00e1kladech, tak\u017ee by se m\u011bly rozhodnut\u00ed u\u010dinit jednou prov\u017edy.<\/p>\n<p>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/delta\/blog\/450006\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0414\u043b\u044f \u043a\u043e\u043d\u0434\u0438\u0446\u0438\u043e\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0432 \u0446\u0435\u043d\u0442\u0440\u0430\u0445 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u0447\u0430\u0449\u0435 \u0432\u0441\u0435\u0433\u043e \u0443\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u044e\u0442 \u0446\u0435\u043d\u0442\u0440\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u044b\u0435 \u043c\u043d\u043e\u0433\u043e\u0437\u043e\u043d\u0430\u043b\u044c\u043d\u044b\u0435 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\u043f\u0440\u043e\u0435\u043a\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0438 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-32661","post","type-post","status-publish","format-standard","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0414\u043b\u044f \u043a\u043e\u043d\u0434\u0438\u0446\u0438\u043e\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0432 \u0446\u0435\u043d\u0442\u0440\u0430\u0445 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u0447\u0430\u0449\u0435 \u0432\u0441\u0435\u0433\u043e \u0443\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u044e\u0442 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