P\u0159i stavb\u011b rodinn\u00e9ho domu \u010dasto \u0159e\u0161\u00edme ot\u00e1zku, jakou pou\u017eijeme tepelnou izolaci v podkrov\u00ed nebo ve stropn\u00ed \u010d\u00e1sti p\u0159\u00edzemn\u00edho domu. Tepeln\u00e1 izolace se velmi \u010dasto posuzuje pouze dle sou\u010dinitele tepeln\u00e9 vodivosti. Zde jsou v podstat\u011b v\u0161echny materi\u00e1ly srovnateln\u00e9. V tomto \u010dl\u00e1nku se zkus\u00edme na tepeln\u00e9 izolace pod\u00edvat z trochu jin\u00e9ho pohledu. \u010casto n\u00e1s v letn\u00edch m\u011bs\u00edc\u00edch tr\u00e1p\u00ed p\u0159eh\u0159\u00edv\u00e1n\u00ed interi\u00e9ru. Pokud se chceme t\u00e9to nep\u0159\u00edjemnosti vyhnout, je nutn\u00e9 \u0159\u00eddit se celou \u0159adou krok\u016f. Jedn\u00edm z nich je posouzen\u00ed konstrukce pomoc\u00ed veli\u010diny zvan\u00e9 f\u00e1zov\u00fd posun teplotn\u00edho kmitu.<\/p>\n
Co to vlastn\u011b je?<\/strong><\/p>\n F\u00e1zov\u00fd posun teplotn\u00edho kmitu\u00a0vyjad\u0159uje, za jak dlouhou dobu za\u010dne skrze konstrukci s\u00e1lat teplo do interi\u00e9ru. Vzhledem ke zn\u00e1m\u00e9 skute\u010dnosti, \u017ee se teplo r\u00e1do \u0161\u00ed\u0159\u00ed do chladn\u011bj\u0161\u00edch prostor, je velmi vhodn\u00e9, kdy\u017e tento \u010das p\u0159es\u00e1hne 10 hodin. Nap\u0159. okolo 10 hodiny rann\u00ed se n\u00e1m za\u010dne zvy\u0161ovat venkovn\u00ed teplota a konstrukce rozpalovat. Izolace teplo akumuluje a pokud je f\u00e1zov\u00fd posun teplotn\u00edho kmitu nap\u0159. 4 hodiny, tak ji\u017e po 14 hodin\u011b za\u010d\u00edn\u00e1 teplo z 10 hodiny rann\u00ed s\u00e1lat do interi\u00e9ru. Pokud bude f\u00e1zov\u00fd posun teplotn\u00edho kmitu nap\u0159. 14 hodin, konstrukce bude naakumulov\u00e1na a\u017e okolo p\u016flnoci. Zde je ji\u017e p\u0159edpoklad, \u017ee v exteri\u00e9ru m\u00e1me ni\u017e\u0161\u00ed teplotu ne\u017e v interi\u00e9ru, tak\u017ee konstrukce m\u016f\u017ee s\u00e1lat do exteri\u00e9ru.<\/p>\n Hodnoty jsou z\u00e1visl\u00e9 na m\u011brn\u00e9 tepeln\u00e9 kapacit\u011b materi\u00e1lu a na objemov\u00e9 hmotnosti. Samotn\u00fd v\u00fdpo\u010det je pom\u011brn\u011b slo\u017eit\u00fd, ale velmi jednodu\u0161e se d\u00e1 spo\u010d\u00edtat mno\u017estv\u00ed naakumulovan\u00e9ho tepla. Do tabulky jsem uvedl b\u011b\u017en\u011b u\u017e\u00edvan\u00e9 materi\u00e1ly \u2013 skeln\u00e1 vlna, polystyren, PUR izolace a celul\u00f3za. M\u00e9n\u011b pou\u017e\u00edvan\u00e9 jsou p\u0159\u00edrodn\u00ed izolace jako nap\u0159. konopn\u00e1 izolace a d\u0159evovl\u00e1knit\u00e1 izolace.<\/p>\n m\u011brn\u00e1 tepeln\u00e1 kapacita<\/b><\/p>\n J\/kg.K<\/b><\/p>\n<\/td>\n objemov\u00e1\u00a0 <\/span>hmotnost<\/b><\/p>\n kg\/m3<\/b><\/p>\n<\/td>\n mno\u017estv\u00ed naakumulovan\u00e9ho tepla<\/b><\/p>\n J\/K.m3<\/b><\/p>\n<\/td>\n<\/tr>\n 2 000<\/p>\n<\/td>\n 150<\/p>\n<\/td>\n 300 000<\/p>\n<\/td>\n<\/tr>\n 2020<\/p>\n<\/td>\n 30<\/p>\n<\/td>\n 60 600<\/p>\n<\/td>\n<\/tr>\n 1 400<\/p>\n<\/td>\n 35<\/p>\n<\/td>\n 49\u00a0000<\/p>\n<\/td>\n<\/tr>\n \u00a01 270<\/p>\n<\/td>\n 22<\/p>\n<\/td>\n 27 940<\/p>\n<\/td>\n<\/tr>\n 1 500<\/p>\n<\/td>\n 8<\/p>\n<\/td>\n 12 000<\/p>\n<\/td>\n<\/tr>\n \u00a0900<\/p>\n<\/td>\n 12<\/p>\n<\/td>\n 10800<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Z tabulky je patrn\u00e9, \u017ee p\u0159i stejn\u00e9 tlou\u0161\u0165ce ulo\u017e\u00edme do d\u0159evovl\u00e1knit\u00e9 izolace 25x v\u00edce tepla ne\u017e do st\u0159\u00edkan\u00e9 PUR izolace, do celul\u00f3zy pak 5x v\u00edce ne\u017e do skeln\u00e9 vlny! Objemov\u00e9 hmotnosti se mohou nap\u0159. u foukan\u00fdch izolac\u00ed m\u011bnit. Navy\u0161ov\u00e1n\u00ed tlou\u0161\u0165ky foukan\u00e9 izolace znamen\u00e1 r\u016fst objemov\u00e9 hmotnosti. V dal\u0161\u00ed tabulce m\u016f\u017eeme porovnat r\u016fzn\u00e9 tlou\u0161\u0165ky izolac\u00ed (v centimetrech) a f\u00e1zov\u00fd posun teplotn\u00edho kmitu (v hodin\u00e1ch).<\/p>\n \u00a0<\/p>\n R\u016fzn\u00e9 tlou\u0161\u0165ky izolac\u00ed a f\u00e1zov\u00fd posun teplotn\u00edho kmitu<\/b><\/p>\n 12<\/p>\n<\/td>\n 0,7<\/p>\n<\/td>\n<\/tr>\n 30<\/p>\n<\/td>\n 3,2<\/p>\n<\/td>\n<\/tr>\n 12<\/p>\n<\/td>\n 2<\/p>\n<\/td>\n<\/tr>\n 44<\/p>\n<\/td>\n 10<\/p>\n<\/td>\n<\/tr>\n 8<\/p>\n<\/td>\n 0,9<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Mysl\u00edm, \u017ee z uveden\u00fdch \u010d\u00edsel je jasn\u00e9, jak se jednotliv\u00e9 materi\u00e1ly b\u011bhem vysok\u00fdch teplot chovaj\u00ed. B\u011b\u017en\u011b pou\u017e\u00edvan\u00e1 skeln\u00e1 vata (nejlevn\u011bj\u0161\u00ed mo\u017en\u00e9 \u0159e\u0161en\u00ed) a tak\u00e9, v posledn\u00ed dob\u011b popul\u00e1rn\u00ed, st\u0159\u00edkan\u00e1 PUR izolace (velmi drah\u00e9 \u0159e\u0161en\u00ed) maj\u00ed z tohoto pohledu nejhor\u0161\u00ed vlastnosti. Jako velmi vhodn\u00e9 se u foukan\u00e9 celul\u00f3zy jev\u00ed u\u017eit\u00ed tlou\u0161\u0165ky 400 milimetr\u016f a v\u00edce. Velmi dob\u0159e by t\u00edmto posouzen\u00edm pro\u0161ly masivn\u011bj\u0161\u00ed konstrukce nap\u0159. panel Ytong o tlou\u0161\u0165ce 200 milimetr\u016f \u010di\u00a0zateplen\u00fd Ytong Multipor o tlou\u0161\u0165ce 200 milimetr\u016f, kde je f\u00e1zov\u00fd posun teplotn\u00edho kmitu 14,5 hodiny.<\/p>\n","featured_image":null,"published_at":"2018-12-05T14:34:58+00:00","reading_time":3,"view_count":7,"original_url":"https:\/\/www.dumproradost.cz\/2018\/prehrivani-podkrovi-tepelna-izolace-strechy-u-bungalovu\/","meta_title":null,"meta_description":null,"author":{"id":2,"name":"Radek Mou\u010dka","slug":"radek-moucka","avatar":null},"categories":[{"id":5,"name":"Stavebni materialy","slug":"stavebni-materialy","color":"#2563eb","icon":null,"sort_order":0}]}}\n\n
\n <\/td>\n \n \n \n \n d\u0159evovl\u00e1knit\u00e1 izolace<\/b><\/td>\n \n \n \n \n foukan\u00e1 celul\u00f3za<\/b><\/td>\n \n \n \n \n PIR panel\u00a0<\/span><\/b><\/td>\n \n \n \n \n EPS 100\u00a0<\/span><\/b><\/td>\n \n \n \n \n st\u0159\u00edkan\u00e1 PUR izolace<\/b><\/td>\n \n \n \n \n skeln\u00e1 vlna<\/b><\/td>\n \n \n \n \n\n
\n <\/td>\n objemov\u00e1 hmotnost<\/b><\/td>\n f\u00e1zov\u00fd posun tepl.kmitu v hod<\/b><\/td>\n<\/tr>\n \n skeln\u00e1 vlna 20 cm<\/b><\/td>\n \n \n \n foukan\u00e1 celul\u00f3za 20 cm<\/b><\/td>\n \n \n \n skeln\u00e1 vlna 40 cm<\/b><\/td>\n \n \n \n foukan\u00e1 celul\u00f3za 40 cm<\/b><\/td>\n \n \n \n st\u0159\u00edkan\u00e1 pur izolace 20 cm<\/b><\/td>\n \n \n