{"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\/sk\/blog\/administrirovanie\/chillernoe-ohlazhdenie-tsod-kakoj-teplonositel-vybrat","title":{"rendered":"Chladiace syst\u00e9my pre datov\u00e9 centr\u00e1: ak\u00fd chladiaci prostriedok zvoli\u0165?","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Na kondicionovanie v d\u00e1tov\u00fdch centr\u00e1ch sa naj\u010dastej\u0161ie in\u0161taluj\u00fa centralizovan\u00e9 viacz\u00f3nov\u00e9 syst\u00e9my s vodou chladen\u00fdmi strojmi (chladi\u010di). Tieto s\u00fa efekt\u00edvnej\u0161ie ako fre\u00f3nov\u00e9 klimatiz\u00e1cie, preto\u017ee cirkuluj\u00faci medzi vonkaj\u0161\u00edmi a vn\u00fatorn\u00fdmi blokmi chladiaci prostriedok prech\u00e1dza do plynn\u00e9ho stavu len pri zv\u00fd\u0161en\u00ed teploty na ur\u010dit\u00fa \u00farove\u0148. Jednou z najd\u00f4le\u017eitej\u0161\u00edch ot\u00e1zok pri navrhovan\u00ed syst\u00e9mu chladi\u010dov je: ak\u00fd chladiaci prostriedok je najlep\u0161\u00ed? M\u00f4\u017ee to by\u0165 voda alebo vodn\u00fd roztok mnoh\u00fdch alkoholov \u2013 propyl\u00e9nglykolu alebo etyl\u00e9nglykolu. Pok\u00fasime sa objasni\u0165 v\u00fdhody a nev\u00fdhody ka\u017ed\u00e9ho variantu.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h2>Fyzika a ch\u00e9mia<\/h2>\n<p><\/p>\n<p>Z h\u013eadiska fyzik\u00e1lnych vlastnost\u00ed (tepeln\u00e1 kapacita, hustota, kinematick\u00e1 viskozita) sa voda pova\u017euje za optim\u00e1lny chladiaci prostriedok. Okrem toho ju mo\u017eno bezpe\u010dne vypusti\u0165 na p\u00f4du alebo do kanaliz\u00e1cie. Bohu\u017eia\u013e, v na\u0161ich zemepisn\u00fdch \u0161\u00edrkach sa voda pou\u017e\u00edva len vo vn\u00fatri budov, preto\u017ee pri 0 \u00b0C zam\u0155za. Hustota chladiaceho prostriedku sa pritom zmen\u0161uje a objem, ktor\u00fd zaber\u00e1, rastie. Proces prebieha nerovnomerne, kompenzova\u0165 ho pomocou expanzn\u00e9ho z\u00e1sobn\u00edka nie je mo\u017en\u00e9. Oblasti zamrznutia s\u00fa izolovan\u00e9, statick\u00fd tlak na steny r\u00far sa zvy\u0161uje a nakoniec d\u00f4jde k roztrhnutiu. Vodn\u00e9 roztoky mnoh\u00fdch alkoholov s\u00fa zbaven\u00e9 t\u00fdchto nedostatkov. Zam\u0155zaj\u00fa pri omnoho ni\u017e\u0161\u00edch teplot\u00e1ch, nevytv\u00e1raj\u00fa miestne zhluky. Ich hustota sa pri kry\u0161taliz\u00e1cii zni\u017euje ove\u013ea menej ako pri premen\u00e1ch vody na \u013ead, a t\u00fdm p\u00e1dom sa objem nezvy\u0161uje tak silno \u2013 aj zamrznut\u00e9 vodn\u00e9 roztoky glykolov neroztrhn\u00fa r\u00fary.<\/p>\n<p><\/p>\n<p>Z\u00e1kazn\u00edci \u010dasto volia propyl\u00e9nglykol, preto\u017ee nie je toxick\u00fd. V podstate ide o povolen\u00fa potravinov\u00fa pr\u00eddavn\u00fa l\u00e1tku E1520, ktor\u00e1 sa pou\u017e\u00edva v pe\u010den\u00ed a v in\u00fdch potravin\u00e1ch ako prostriedok na udr\u017eanie vlhkosti. Pou\u017e\u00edva sa aj v kozmetike a mnoh\u00fdch \u010fal\u0161\u00edch oblastiach. Ak je syst\u00e9m naplnen\u00fd vodn\u00fdm roztokom propyl\u00e9nglykolu, nie s\u00fa potrebn\u00e9 zvl\u00e1\u0161tne bezpe\u010dnostn\u00e9 opatrenia: z\u00e1kazn\u00edk potrebuje iba \u010fal\u0161\u00ed n\u00e1dr\u017e na kompenz\u00e1ciu \u00fanikov. Pr\u00e1ca s etyl\u00e9nglykolom je zlo\u017eit\u011bj\u0161\u00ed \u2013 t\u00e1to l\u00e1tka patr\u00ed do kateg\u00f3rie mierne toxick\u00fdch (tretia trieda nebezpe\u010denstva). Jej maxim\u00e1lna povolen\u00e1 koncentr\u00e1cia vo vzduchu je 5 mg\/m3, ale kv\u00f4li n\u00edzkej volatilite pri norm\u00e1lnej teplote sa m\u00f4\u017ee s t\u00fdmto polyatomov\u00fdm alkoholom otr\u00e1vi\u0165 len vtedy, ak sa n\u00edm dlhodobo d\u00fdcha.<\/p>\n<p><\/p>\n<p>Najhor\u0161ie to vyzer\u00e1 s odpadmi: voda a propyl\u00e9nglykol nevy\u017eaduj\u00fa likvid\u00e1ciu, ale maxim\u00e1lna koncentr\u00e1cia etyl\u00e9nglykolu v spolo\u010dn\u00fdch vodn\u00fdch zdrojoch nesmie presiahnu\u0165 1 mg\/l. Z tohto d\u00f4vodu si vlastn\u00edci d\u00e1tov\u00fdch centier mus\u00ed do rozpo\u010dtu zahrn\u00fa\u0165 \u0161peci\u00e1lne odvod\u0148ovacie syst\u00e9my, izolovan\u00e9 n\u00e1doby a\/alebo syst\u00e9my na riedenie vyp\u00fa\u0161\u0165an\u00e9ho chladiaceho m\u00e9dia vodou: jednoducho ho vypusti\u0165 do kanaliz\u00e1cie nie je mo\u017en\u00e9. Mno\u017estv\u00e1 vody na riedenie s\u00fa stokr\u00e1t v\u00e4\u010d\u0161ie ako mno\u017estv\u00e1 chladiaceho m\u00e9dia a vylieva\u0165 ho na zem alebo na podlahu je mimoriadne ne\u017eelan\u00e9 \u2013 toxick\u00fd polyatomov\u00fd alkohol sa mus\u00ed splachova\u0165 ve\u013ek\u00fdm mno\u017estvom vody. Napriek tomu je pou\u017eitie etyl\u00e9nglykolu v modern\u00fdch klimatiza\u010dn\u00fdch syst\u00e9moch <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sk\/kompaniya\/data-centers\/\"   title=\"d\u00e1tov\u00fdch centier\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"4646\">d\u00e1tov\u00fdch centier<\/a> tie\u017e \u00faplne bezpe\u010dn\u00e9 za dodr\u017eania v\u0161etk\u00fdch potrebn\u00fdch bezpe\u010dnostn\u00fdch opatren\u00ed.<\/p>\n<p><\/p>\n<h2>Ekonomika<\/h2>\n<p><\/p>\n<p>Vodu je mo\u017en\u00e9 pova\u017eova\u0165 za takmer bezplatn\u00fa v porovnan\u00ed s n\u00e1kladmi na teplonosn\u00e9 zmesi na b\u00e1ze polyatomick\u00fdch alkoholov. Vodn\u00fd roztok propyl\u00e9nglykolu pre syst\u00e9m chladi\u010d-fan coil je dos\u0165 drah\u00fd \u2013 stoj\u00ed pribli\u017ene 80 rub\u013eov za liter. S prihliadnut\u00edm na potrebu pravidelnej v\u00fdmeny teplonosnej l\u00e1tky sa to premietne do zna\u010dn\u00fdch s\u00fam. Cena vodn\u00e9ho roztoku etyl\u00e9nglykolu je takmer dvakr\u00e1t ni\u017e\u0161ia, ale s n\u00edm bude potrebn\u00e9 zoh\u013eadni\u0165 aj n\u00e1klady na likvid\u00e1ciu, ktor\u00e9 s\u00fa v\u0161ak tie\u017e relat\u00edvne mal\u00e9. Existuj\u00fa nuansy t\u00fdkaj\u00face sa viskozity a tepelnej kapacity: teplonosn\u00e1 l\u00e1tka na b\u00e1ze propyl\u00e9nglykolu si vy\u017eaduje vy\u0161\u0161\u00ed tlak, ktor\u00fd vytv\u00e1ra cirkula\u010dn\u00e9 \u010derpadlo. Celkovo s\u00fa n\u00e1klady na prev\u00e1dzku syst\u00e9mu s etyl\u00e9nglykolom podstatne ni\u017e\u0161ie, tak\u017ee tento variant si \u010dasto vyberaj\u00fa, napriek ur\u010ditej toxicite teplonosnej l\u00e1tky. \u010eal\u0161ou mo\u017enos\u0165ou, ako zn\u00ed\u017ei\u0165 n\u00e1klady, je pou\u017eitie dvojokruhov\u00e9ho syst\u00e9mu s v\u00fdmenn\u00edkom tepla, kde sa v vn\u00fatorn\u00fdch miestnostiach s pozit\u00edvnou teplotou cirkuluje be\u017en\u00e1 voda, zatia\u013e \u010do vonku teplo pren\u00e1\u0161a nemrzn\u00faci glykolov\u00fd roztok. \u00da\u010dinnos\u0165 tohto syst\u00e9mu je s\u00edce ni\u017e\u0161ia, ale objemy n\u00e1kladnej teplonosnej l\u00e1tky sa v\u00fdrazne zmen\u0161uj\u00fa.<\/p>\n<p><\/p>\n<h2>Zhrnutie<\/h2>\n<p><\/p>\n<p>V skuto\u010dnosti v\u0161etky uveden\u00e9 mo\u017enosti chladiacich syst\u00e9mov (okrem \u010disto vodn\u00fdch, ktor\u00e9 s\u00fa v na\u0161ich \u0161\u00edrkach nemo\u017en\u00e9) maj\u00fa pr\u00e1vo na existenciu. V\u00fdber z\u00e1vis\u00ed od celkov\u00fdch n\u00e1kladov na vlastn\u00edctvo, ktor\u00e9 je potrebn\u00e9 po\u010d\u00edta\u0165 v ka\u017edom konkr\u00e9tnom pr\u00edpade u\u017e vo f\u00e1ze projektovania. Jedin\u00e9, \u010do by ste za \u017eiadnych okolnost\u00ed nemali robi\u0165: meni\u0165 koncept, ke\u010f je projekt takmer hotov\u00fd. E\u0161te viac sa ned\u00e1 zmeni\u0165 teplonosn\u00e1 l\u00e1tka, ke\u010f u\u017e prebieha mont\u00e1\u017e in\u017einierskych syst\u00e9mov bud\u00faceho d\u00e1tov\u00e9ho centra. Rozpa\u010dit\u00e9 a tr\u00e1penia sa premietnu do v\u00e1\u017enych n\u00e1kladov, tak\u017ee s v\u00fdberom je potrebn\u00e9 sa raz a nav\u017edy rozhodn\u00fa\u0165.<\/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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