{"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\/et\/blog\/administrirovanie\/chillernoe-ohlazhdenie-tsod-kakoj-teplonositel-vybrat","title":{"rendered":"Kliimaseade andmekeskustes: millist jahutusvedelikku valida?","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Andmete keskuste jahutamiseks kasutatakse k\u00f5ige enam tsentraliseeritud mitme tsooniga s\u00fcsteeme, millel on veega jahutavad masinad (chillerid). Need on t\u00f5husamad kui freooni konditsioneerid, kuna soojusvaheti, mis ringleb v\u00e4limiste ja sisemiste blokide vahel, ei muutu gaasi olekusse, ning kompressor-kondensaatori plokk k\u00e4ivitatakse t\u00f6\u00f6le vaid siis, kui temperatuur t\u00f5useb teatud tasemeni. \u00dcks olulisemaid k\u00fcsimusi chillerite s\u00fcsteemi projekteerimisel on, milline soojusvaheti on parem kasutada? See v\u00f5ib olla vesi v\u00f5i veeline lahus mitmeatomilisi alkohole \u2013 prop\u00fcleengl\u00fckooli v\u00f5i et\u00fcleengl\u00fckooli. Proovime v\u00e4lja selgitada iga variandi eelised ja puudused.<\/p>\n

<\/a><\/noindex><\/p>\n

F\u00fc\u00fcsika ja keemia<\/h2>\n

<\/p>\n

F\u00fc\u00fcsikaliste omaduste (soojusmahtuvus, tihedus, kineetiline viskoossus) poolest peetakse vett optimaalseks soojusvahetuseks. Lisaks sellele saab seda rahulikult eemaldada mulda v\u00f5i kanalisatsiooni. Kahjuks kasutatakse meie laiuskraadidel vett vaid siseruumides, kuna see k\u00fclmub 0 \u00b0C juures. Soojusvahetaja tihedus v\u00e4heneb samas, samal ajal kui selle maht suureneb. Protsess toimub eba\u00fchtlaselt ning seda ei saa korvata paisupaagi abil. K\u00fclmumiskohtade \u00fcmber on isolatsioon, statiline r\u00f5hk torude seintele suureneb ning l\u00f5puks juhtub rebend. Veelahused mitmeatomiliste alkoholide puhul on vabastatud neist puudustest. Need k\u00fclmuvad tunduvalt madalamatel temperatuuridel, moodustamata lokaalseid koldeid. Nende tihedus kristalliseerumise k\u00e4igus v\u00e4heneb palju v\u00e4hem kui vee muundumisel j\u00e4\u00e4ks, mist\u00f5ttu ka maht ei suurene nii palju \u2013 isegi k\u00fclmunud gl\u00fckoolilahused ei kahjusta torusid.<\/p>\n

<\/p>\n

Tavaliselt valivad kliendid prop\u00fcleengl\u00fckooli, kuna see ei ole m\u00fcrgine. Tegelikult on see lubatud toidulisand E1520, mida kasutatakse k\u00fcpsetistes ja muudes toiduainetes niiskuse hoidjana. Seda rakendatakse ka kosmeetikatoodetes ja paljus muus. Kui s\u00fcsteem fillada prop\u00fcleengl\u00fckooli veelahusega, ei ole erilisi ettevaatusmeetmeid vaja: kliendile on vajalik vaid t\u00e4iendav reservuaar lekete kompenseerimiseks. Eet\u00fcleengl\u00fckooliga on keerulisem t\u00f6\u00f6tada - see aine kuulub m\u00f5\u00f5dukalt toksiliste (kolmandasse ohuklassi). Selle lubatud maksimaalne kontsentratsioon \u00f5hus on 5 mg\/m3, kuid madala lenduvuse t\u00f5ttu tavalise temperatuuri korral saab selle mitmeahelise alkoholi aurudega m\u00fcrgitada vaid siis, kui neid pikka aega sisse hingata.<\/p>\n

<\/p>\n

Halbada on veega ja prop\u00fcleengl\u00fckooliga: need ei vaja utiliseerimist, kuid et\u00fcleengl\u00fckooli kontsentratsioon \u00fcldkasutuses olevates vees ei tohiks \u00fcletada 1 mg\/l. Seet\u00f5ttu peavad andmekeskuste omanikud oma eelarvesse arvestama spetsiaalsed kanalisatsioonis\u00fcsteemid, isolatsioonikonteinerid ja\/v\u00f5i segamisseadmed, et mitte lihtsalt t\u00fchjendada seda kanalisatsiooni. Veekogused lahjendamiseks on sadu kordi suuremad kui soojuskandja maht ja selle valamine pinnasesse v\u00f5i p\u00f5randale on \u00e4\u00e4rmiselt soovimatu \u2013 toksilisest mitmeatomilisest alkoholist tuleb lahti saada suure veekogusega. Siiski on et\u00fcleengl\u00fckooli kasutamine kaasaegsetes konditsioneerimiss\u00fcsteemides t\u00e4iesti ohutu, kui j\u00e4rgite k\u00f5iki vajalikke ettevaatusabin\u00f5usid. andmekeskustega<\/a> on samuti t\u00e4iesti ohutu, kui j\u00e4rgitakse k\u00f5iki vajalikke ettevaatusabin\u00f5usid.<\/p>\n

<\/p>\n

Majandusteadus<\/h2>\n

<\/p>\n

Vett v\u00f5ib pidada praktiliselt tasuta v\u00f5rreldes mitmeaatomsel alkoholidel p\u00f5hinevate soojusvedelike hindadega. Propeengl\u00fckooli vesilahus chiller-fankoilis\u00fcsteemis on \u00fcsna kallis \u2013 hind on umbes 80 rubla liitri kohta. Arvestades, et soojusvedelikku tuleb perioodiliselt vahetada, ulatub see m\u00e4rkimisv\u00e4\u00e4rsetesse summadesse. Eetilengl\u00fckooli vesilahuse hind on peaaegu poole v\u00e4iksem, kuid sellega tuleb arvestada ka k\u00f5rvaldamiskuludega, mis on siiski suhteliselt tagasihoidlikud. On n\u00fcansse, mis on seotud viskoossuse ja soojusmahtuvusega: prop\u00fcleengl\u00fckooli p\u00f5hine soojusvedelik n\u00f5uab k\u00f5rgemat survet, mida loob tsirkulatsioonipump. \u00dcldiselt on eetilengl\u00fckooliga s\u00fcsteemi t\u00f6\u00f6kulud m\u00e4rkimisv\u00e4\u00e4rselt madalamad, nii et seda variant on sageli valitud, hoolimata soojusvedeliku m\u00f5ningasest toksilisusest. Veel \u00fcks v\u00f5imalus kulude v\u00e4hendamiseks on kahe ringi s\u00fcsteemi kasutamine soojusvaheti abil, kus siseruumides, kus on positiivne temperatuur, tsirkuleerib tavaline vesi, samas kui v\u00e4listemperatuuri korral kannab soojust j\u00e4\u00e4vaba gl\u00fckooli lahus. Sellise s\u00fcsteemi efektiivsus on m\u00f5nev\u00f5rra madalam, kuid kallis soojusvedeliku kogused v\u00e4henevad m\u00e4rkimisv\u00e4\u00e4rselt.<\/p>\n

<\/p>\n

Kokkuv\u00f5te<\/h2>\n

<\/p>\n

Tegelikult on k\u00f5ik loetletud jahutuslahendused (v.a puhtalt veep\u00f5hised, mis meie laiuskraadidel ei ole v\u00f5imalikud) olemasolu \u00f5iguse. Valik s\u00f5ltub t\u00e4ielikust omamiskulust, mis tuleb igas konkreetses juhtumis juba projekteerimise etapis arvesse v\u00f5tta. Ainus, mida ei tohi mingil juhul teha: muuta kontseptsiooni, kui projekt on peaaegu valmis. Veel v\u00e4hem tohib muuta soojusvedelikku, kui tulevase andmekeskuse inseneris\u00fcsteemide paigaldamine on juba k\u00e4imas. Kahtlemine ja piinlemine toovad kaasa t\u00f5sised kulud, seega tuleks valik teha kindlaks \u00fcks kord ja l\u00f5puks.<\/p>\n

Allikas: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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