{"id":3446,"date":"2026-07-01T07:39:42","date_gmt":"2026-07-01T07:39:42","guid":{"rendered":"https:\/\/megainsulation.com.tr\/?p=3446"},"modified":"2026-10-30T04:17:09","modified_gmt":"2026-10-30T04:17:09","slug":"isi-iletim-katsayisi-nedir","status":"publish","type":"post","link":"https:\/\/megainsulation.com.tr\/en\/isi-iletim-katsayisi-nedir\/","title":{"rendered":"Is\u0131 \u0130letim Katsay\u0131s\u0131 (\u03bb) Nedir? Form\u00fcl\u00fc, Birimi ve Malzeme De\u011ferleri"},"content":{"rendered":"<p><strong>K\u0131saca:<\/strong> Is\u0131 iletim katsay\u0131s\u0131 (\u03bb, lambda de\u011feri), bir malzemenin \u0131s\u0131y\u0131 ne kadar kolay iletti\u011fini g\u00f6steren fiziksel b\u00fcy\u00fckl\u00fckt\u00fcr ve birimi W\/mK&#8217;dir. De\u011fer, 1 metre kal\u0131nl\u0131\u011f\u0131ndaki bir katman\u0131n 1 m\u00b2 y\u00fczeyinden, iki y\u00fcz\u00fc aras\u0131nda 1 K (1 \u00b0C) s\u0131cakl\u0131k fark\u0131 varken ge\u00e7en \u0131s\u0131 ak\u0131\u015f\u0131n\u0131 watt olarak verir. \u03bb ne kadar d\u00fc\u015f\u00fckse malzeme o kadar iyi yal\u0131t\u0131r.<\/p>\n<p>Teknik f\u00f6ylerde bu de\u011fer \u03bbD, yani \u00fcreticinin beyan etti\u011fi \u0131s\u0131l iletkenlik olarak yer al\u0131r; \u0131s\u0131l iletkenlik, \u0131s\u0131 iletkenlik katsay\u0131s\u0131 ve lambda de\u011feri ayn\u0131 b\u00fcy\u00fckl\u00fc\u011f\u00fcn farkl\u0131 adlar\u0131d\u0131r. \u03bb tek ba\u015f\u0131na bir duvar\u0131n ne kadar \u0131s\u0131 kaybedece\u011fini s\u00f6ylemez: kal\u0131nl\u0131kla birle\u015fince katman\u0131n \u0131s\u0131l direncini (R), duvar\u0131n b\u00fct\u00fcn katmanlar\u0131yla birle\u015fince de \u0131s\u0131l ge\u00e7irgenli\u011fini (U) verir. Bu rehberde form\u00fclleri basit hesaplarla g\u00f6steriyor, \u03bb&#8217;y\u0131 neyin de\u011fi\u015ftirdi\u011fini ve laboratuvarda nas\u0131l \u00f6l\u00e7\u00fcld\u00fc\u011f\u00fcn\u00fc anlat\u0131yor, Mega Yal\u0131t\u0131m&#8217;\u0131n ta\u015fy\u00fcn\u00fc, EPS ve XPS teknik f\u00f6ylerindeki beyan de\u011ferlerini tek tabloda topluyoruz. Konuya genel bir giri\u015fle ba\u015flamak isterseniz <a href=\"https:\/\/megainsulation.com.tr\/en\/isi-yalitimi-nedir\/\">\u0131s\u0131 yal\u0131t\u0131m\u0131 nedir<\/a> yaz\u0131m\u0131za bakabilirsiniz.<\/p>\n<div style=\"position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; margin: 0 auto;\"><iframe style=\"position: absolute; top: 0; left: 0; width: 100%; height: 100%; border-radius: 8px;\" title=\"What is the Thermal Conductivity Coefficient? The Real Difference in Insulation Materials!\" src=\"https:\/\/www.youtube.com\/embed\/AePySJhFy6M\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/div>\n<h2>Is\u0131 iletim katsay\u0131s\u0131 nedir, W\/mK birimi ne anlat\u0131r?<\/h2>\n<p>Is\u0131 iletim katsay\u0131s\u0131, s\u0131cakl\u0131klar\u0131 farkl\u0131 iki y\u00fcz aras\u0131nda \u0131s\u0131n\u0131n malzemenin i\u00e7inden iletimle ne kadar kolay ge\u00e7ti\u011fini anlat\u0131r. Birim, metrekare ba\u015f\u0131na ge\u00e7en \u0131s\u0131 ak\u0131\u015f\u0131n\u0131n (W\/m\u00b2) metre ba\u015f\u0131na s\u0131cakl\u0131k de\u011fi\u015fimine (K\/m) oran\u0131ndan gelir; sadele\u015fince W\/(m\u00b7K), k\u0131saca W\/mK kal\u0131r. Kelvin cinsinden bir s\u0131cakl\u0131k fark\u0131 santigrat derece cinsinden ayn\u0131 farka e\u015fit oldu\u011fundan, 1 K yerine 1 \u00b0C demek de do\u011frudur.<\/p>\n<p>\u03bb bir malzeme \u00f6zelli\u011fidir ve kal\u0131nl\u0131\u011fa ba\u011fl\u0131 de\u011fildir; Mega teknik f\u00f6ylerinde de bir \u00fcr\u00fcn tipi i\u00e7in b\u00fct\u00fcn kal\u0131nl\u0131klarda tek bir \u03bbD de\u011feri beyan edilir. Is\u0131 yal\u0131t\u0131m malzemelerinin \u03bb de\u011ferinin d\u00fc\u015f\u00fck olmas\u0131, durgun havay\u0131 ya da gaz\u0131 k\u00fc\u00e7\u00fck bo\u015fluklarda tutmalar\u0131ndan kaynaklan\u0131r: ta\u015fy\u00fcn\u00fc havay\u0131 lifleri aras\u0131nda, EPS genle\u015ftirilmi\u015f tanelerin h\u00fccrelerinde, XPS ise ekstr\u00fczyonla olu\u015fan kapal\u0131 h\u00fccrelerinde hapseder. Is\u0131n\u0131n iletim, ta\u015f\u0131n\u0131m ve \u0131\u015f\u0131n\u0131mla nas\u0131l yay\u0131ld\u0131\u011f\u0131n\u0131 g\u00fcndelik \u00f6rneklerle anlatt\u0131\u011f\u0131m\u0131z <a href=\"https:\/\/megainsulation.com.tr\/en\/termos-nasil-calisir\/\">termos nas\u0131l \u00e7al\u0131\u015f\u0131r<\/a> And <a href=\"https:\/\/megainsulation.com.tr\/en\/iglo-yalitim\/\">iglo nedir<\/a> yaz\u0131lar\u0131 bu kavramlara iyi bir giri\u015f sunar.<\/p>\n<h2>Is\u0131 iletim katsay\u0131s\u0131 form\u00fcl\u00fc nedir?<\/h2>\n<p>Is\u0131 iletim katsay\u0131s\u0131n\u0131n temel ba\u011f\u0131nt\u0131s\u0131, tek ve d\u00fczg\u00fcn bir katmandan kararl\u0131 durumda ge\u00e7en \u0131s\u0131 ak\u0131s\u0131n\u0131 verir: q = \u03bb \u00d7 \u0394T \/ d. Yap\u0131 fizi\u011finde bundan t\u00fcreyen \u00fc\u00e7 form\u00fcl daha kullan\u0131l\u0131r: katman\u0131n \u0131s\u0131l direnci, yap\u0131 eleman\u0131n\u0131n toplam \u0131s\u0131l direnci ve U de\u011feri.<\/p>\n<ul>\n<li><strong>Is\u0131 ak\u0131s\u0131:<\/strong> q = \u03bb \u00d7 \u0394T \/ d. Burada q metrekare ba\u015f\u0131na ge\u00e7en \u0131s\u0131 (W\/m\u00b2), \u0394T iki y\u00fcz aras\u0131ndaki s\u0131cakl\u0131k fark\u0131 (K), d ise katman kal\u0131nl\u0131\u011f\u0131d\u0131r (m).<\/li>\n<li><strong>Is\u0131l diren\u00e7 (R):<\/strong> R = d \/ \u03bb. Birimi m\u00b2K\/W&#8217;dir; kal\u0131nl\u0131k artt\u0131k\u00e7a ya da \u03bb d\u00fc\u015ft\u00fck\u00e7e R b\u00fcy\u00fcr.<\/li>\n<li><strong>Toplam \u0131s\u0131l diren\u00e7 (RT):<\/strong> RT = Rsi + R1 + R2 + \u2026 + Rn + Rse. Rsi ve Rse i\u00e7 ve d\u0131\u015f y\u00fczey diren\u00e7leridir; EN ISO 6946&#8217;ya g\u00f6re duvarlarda Rsi = 0,13, Rse = 0,04 m\u00b2K\/W al\u0131n\u0131r.<\/li>\n<li><strong>Is\u0131l ge\u00e7irgenlik (U):<\/strong> U = 1 \/ RT. Birimi W\/m\u00b2K&#8217;dir. U de\u011feri, yap\u0131 eleman\u0131n\u0131n alan\u0131 ve i\u00e7 ile d\u0131\u015f ortam aras\u0131ndaki s\u0131cakl\u0131k fark\u0131yla \u00e7arp\u0131ld\u0131\u011f\u0131nda o elemandan ge\u00e7en \u0131s\u0131 ak\u0131\u015f\u0131 (W) bulunur.<\/li>\n<\/ul>\n<p>Basit bir \u00f6rnek: Mega teknik f\u00f6y\u00fcne g\u00f6re MEGA SW F150 ta\u015fy\u00fcn\u00fc mantolama levhas\u0131n\u0131n \u03bbD de\u011feri en fazla 0,037 W\/mK&#8217;dir. 10 cm (0,10 m) kal\u0131nl\u0131\u011f\u0131ndaki levhan\u0131n \u0131s\u0131l direnci R = 0,10 \/ 0,037 \u2248 2,70 m\u00b2K\/W olur. F\u00f6y\u00fcn \u0131s\u0131l diren\u00e7 sat\u0131r\u0131 da bu hesaba dayan\u0131r; de\u011ferler a\u015fa\u011f\u0131 yuvarlanarak verilir: 100 mm i\u00e7in 2,70, 120 mm i\u00e7in 3,20 m\u00b2K\/W.<\/p>\n<h2>Is\u0131 iletim katsay\u0131s\u0131 b\u00fcy\u00fckse ne olur, k\u00fc\u00e7\u00fckse ne olur?<\/h2>\n<p>Is\u0131 iletim katsay\u0131s\u0131 b\u00fcy\u00fckse malzeme \u0131s\u0131y\u0131 kolay iletir: ayn\u0131 kal\u0131nl\u0131kta \u0131s\u0131l direnci d\u00fc\u015f\u00fck kal\u0131r, duvar\u0131n U de\u011feri y\u00fckselir ve k\u0131\u015f\u0131n i\u00e7eriden d\u0131\u015far\u0131ya, yaz\u0131n d\u0131\u015far\u0131dan i\u00e7eriye daha fazla \u0131s\u0131 ge\u00e7er. Katsay\u0131 k\u00fc\u00e7\u00fckse ince bir katman bile y\u00fcksek \u0131s\u0131l diren\u00e7 sa\u011flar.<\/p>\n<p>Fark, yap\u0131da s\u0131k kullan\u0131lan malzemelerle kar\u015f\u0131la\u015ft\u0131r\u0131nca belirginle\u015fir. A\u015fa\u011f\u0131daki de\u011ferler, \u0130ngiltere&#8217;de U de\u011feri hesaplar\u0131nda ba\u015fvurulan BRE k\u0131lavuzunun \u00fcr\u00fcne \u00f6zel veri bulunmad\u0131\u011f\u0131nda \u00f6nerdi\u011fi \u0131s\u0131l iletkenliklerdir; \u0131s\u0131 yal\u0131t\u0131m levhalar\u0131 i\u00e7in Mega teknik f\u00f6ylerindeki beyan de\u011ferleri verilmi\u015ftir.<\/p>\n<table>\n<thead>\n<tr>\n<th>Malzeme<\/th>\n<th>Is\u0131 iletim katsay\u0131s\u0131 \u03bb (W\/mK)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Al\u00fcminyum (tipik ala\u015f\u0131m)<\/td>\n<td>160<\/td>\n<\/tr>\n<tr>\n<td>Yumu\u015fak \u00e7elik (galvanizli dahil)<\/td>\n<td>50<\/td>\n<\/tr>\n<tr>\n<td>Betonarme (%1 donat\u0131)<\/td>\n<td>2,30<\/td>\n<\/tr>\n<tr>\n<td>Granit veya kumta\u015f\u0131 (2600 kg\/m\u00b3)<\/td>\n<td>2,30<\/td>\n<\/tr>\n<tr>\n<td>Al\u00e7\u0131 plaka (700 kg\/m\u00b3&#8217;e kadar)<\/td>\n<td>0,21<\/td>\n<\/tr>\n<tr>\n<td>Yumu\u015fak a\u011fa\u00e7 (tipik yo\u011funluk 500 kg\/m\u00b3)<\/td>\n<td>0,13<\/td>\n<\/tr>\n<tr>\n<td>Pomza (400 kg\/m\u00b3)<\/td>\n<td>0,12<\/td>\n<\/tr>\n<tr>\n<td>Mega ta\u015fy\u00fcn\u00fc, EPS ve XPS \u0131s\u0131 yal\u0131t\u0131m levhalar\u0131 (\u03bbD)<\/td>\n<td>0,031\u20130,042<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Kaynak: BRE, Conventions for U-value calculations (BR 443, 2019); Mega ta\u015fy\u00fcn\u00fc, EPS ve XPS teknik f\u00f6yleri. Tabloya g\u00f6re betonarmenin \u0131s\u0131 iletim katsay\u0131s\u0131, yal\u0131t\u0131m levhalar\u0131n\u0131nkinin 50 kat\u0131ndan fazlad\u0131r. 10 cm&#8217;lik SW F150 levhan\u0131n sa\u011flad\u0131\u011f\u0131 2,70 m\u00b2K\/W \u0131s\u0131l direnci yaln\u0131z betonarmeyle elde etmek i\u00e7in yakla\u015f\u0131k 6,2 metre kal\u0131nl\u0131k gerekirdi. Kolon, kiri\u015f ve perde duvarlar\u0131n da d\u0131\u015far\u0131dan yal\u0131t\u0131lmas\u0131 bu nedenle gereklidir; yal\u0131t\u0131m\u0131n kesintiye u\u011frad\u0131\u011f\u0131 bu b\u00f6lgelerdeki \u0131s\u0131 kayb\u0131n\u0131 <a href=\"https:\/\/megainsulation.com.tr\/en\/yalitimin-giyinme-mantigi\/\">\u0131s\u0131 k\u00f6pr\u00fcs\u00fc<\/a> yaz\u0131m\u0131zda anlatt\u0131k.<\/p>\n<h2>\u03bb, R ve U de\u011feri aras\u0131ndaki fark nedir?<\/h2>\n<p>\u03bb malzemenin, R belirli kal\u0131nl\u0131ktaki bir katman\u0131n, U ise duvar, \u00e7at\u0131 veya d\u00f6\u015feme gibi bir yap\u0131 eleman\u0131n\u0131n tamam\u0131n\u0131n \u0131s\u0131l davran\u0131\u015f\u0131n\u0131 g\u00f6sterir. \u03bb ve U&#8217;da d\u00fc\u015f\u00fck de\u011fer, R&#8217;de y\u00fcksek de\u011fer daha iyi yal\u0131t\u0131m demektir.<\/p>\n<table>\n<thead>\n<tr>\n<th>De\u011fer<\/th>\n<th>Neyi g\u00f6sterir?<\/th>\n<th>Birim<\/th>\n<th>Nas\u0131l bulunur?<\/th>\n<th>Daha iyi yal\u0131t\u0131mda<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u03bb (\u0131s\u0131 iletim katsay\u0131s\u0131, \u0131s\u0131l iletkenlik)<\/td>\n<td>Malzemenin \u0131s\u0131y\u0131 iletme kolayl\u0131\u011f\u0131; kal\u0131nl\u0131ktan ba\u011f\u0131ms\u0131zd\u0131r<\/td>\n<td>W\/mK<\/td>\n<td>Laboratuvarda \u00f6l\u00e7\u00fcl\u00fcr, teknik f\u00f6yde \u03bbD olarak beyan edilir<\/td>\n<td>Low<\/td>\n<\/tr>\n<tr>\n<td>R (\u0131s\u0131l diren\u00e7)<\/td>\n<td>Belirli kal\u0131nl\u0131ktaki bir katman\u0131n \u0131s\u0131 ge\u00e7i\u015fine g\u00f6sterdi\u011fi diren\u00e7<\/td>\n<td>m\u00b2K\/W<\/td>\n<td>R = d \/ \u03bb<\/td>\n<td>High<\/td>\n<\/tr>\n<tr>\n<td>U (\u0131s\u0131l ge\u00e7irgenlik, U de\u011feri)<\/td>\n<td>Bir yap\u0131 eleman\u0131ndan, b\u00fct\u00fcn katmanlar\u0131 ve y\u00fczey diren\u00e7leriyle birlikte, metrekare ve kelvin ba\u015f\u0131na ge\u00e7en \u0131s\u0131<\/td>\n<td>W\/m\u00b2K<\/td>\n<td>U = 1 \/ (Rsi + \u03a3R + Rse)<\/td>\n<td>Low<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Binalarda Enerji Performans\u0131 Y\u00f6netmeli\u011fi \u0131s\u0131 yal\u0131t\u0131m projesini zorunlu tutar; proje <a href=\"https:\/\/megainsulation.com.tr\/en\/ts-825-standardi\/\">TS 825<\/a> standard\u0131na g\u00f6re haz\u0131rlan\u0131r. Projede duvar, \u00e7at\u0131 ve d\u00f6\u015feme gibi yap\u0131 elemanlar\u0131n\u0131n U de\u011ferleri hesaplan\u0131r; bu hesab\u0131n girdisi, katmanlardaki malzemelerin \u0131s\u0131l iletkenlik de\u011ferleridir. \u03bb de\u011feri iyi olan bir levha da ancak projede \u00f6ng\u00f6r\u00fclen kal\u0131nl\u0131kta uyguland\u0131\u011f\u0131nda hedeflenen U de\u011ferine ula\u015f\u0131r.<\/p>\n<h2>Ta\u015fy\u00fcn\u00fc, EPS ve XPS&#8217;in \u0131s\u0131 iletim katsay\u0131s\u0131 ka\u00e7t\u0131r?<\/h2>\n<p>Mega teknik f\u00f6ylerine g\u00f6re ta\u015fy\u00fcn\u00fc, EPS ve XPS levhalar\u0131n beyan edilen \u0131s\u0131 iletim katsay\u0131lar\u0131 (\u03bbD) 0,031 ile 0,042 W\/mK aras\u0131ndad\u0131r. De\u011fer yaln\u0131z malzeme t\u00fcr\u00fcne de\u011fil, \u00fcr\u00fcn tipine g\u00f6re de de\u011fi\u015fir; kar\u015f\u0131la\u015ft\u0131rmay\u0131 her zaman tip ad\u0131yla yapmak gerekir.<\/p>\n<table>\n<thead>\n<tr>\n<th>Malzeme<\/th>\n<th>Mega \u00fcr\u00fcn\u00fc ve tipi<\/th>\n<th>\u03bbD (W\/mK)<\/th>\n<th>\u00dcr\u00fcn standard\u0131<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Stone Wool<\/td>\n<td>Mantolama levhas\u0131: MEGA SW F150, F120, PLUS, ULTRA<\/td>\n<td>\u22640,037<\/td>\n<td>TS EN 13162+A1<\/td>\n<\/tr>\n<tr>\n<td>Stone Wool<\/td>\n<td>Mantolama levhas\u0131: MEGA SW-35L<\/td>\n<td>\u22640,035<\/td>\n<td>TS EN 13162+A1<\/td>\n<\/tr>\n<tr>\n<td>Stone Wool<\/td>\n<td>Giydirme cephe levhas\u0131 (SW EF 70\/80\/90), ara b\u00f6lme levhas\u0131 (SW PB 40\/50\/60)<\/td>\n<td>\u22640,035<\/td>\n<td>TS EN 13162+A1<\/td>\n<\/tr>\n<tr>\n<td>Stone Wool<\/td>\n<td>Teras \u00e7at\u0131 levhas\u0131 (30\u201370 kPa tipleri)<\/td>\n<td>\u22640,039<\/td>\n<td>TS EN 13162+A1<\/td>\n<\/tr>\n<tr>\n<td>White EPS<\/td>\n<td>EPSW tipleri (EPS 40W&#8217;den EPS 120W&#8217;ye)<\/td>\n<td>0,034\u20130,042<\/td>\n<td>TS EN 13163<\/td>\n<\/tr>\n<tr>\n<td>Gri EPS<\/td>\n<td>EPSG tipleri (EPS 30P-G&#8217;den EPS 70 G&#8217;ye)<\/td>\n<td>0,031\u20130,036<\/td>\n<td>TS EN 13163<\/td>\n<\/tr>\n<tr>\n<td>XPS<\/td>\n<td>MEGA XPS T1500, T2000, T3000<\/td>\n<td>0,035<\/td>\n<td>TS EN 13164<\/td>\n<\/tr>\n<tr>\n<td>XPS<\/td>\n<td>MEGA XPS T2500<\/td>\n<td>0,036<\/td>\n<td>TS EN 13164<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Kaynak: Mega ta\u015fy\u00fcn\u00fc, EPS ve XPS teknik f\u00f6yleri. \u03bbD, 10 \u00b0C ortalama s\u0131cakl\u0131k i\u00e7in beyan edilen de\u011ferdir. Ta\u015fy\u00fcn\u00fc f\u00f6ylerinde de\u011fer \u00fcst s\u0131n\u0131r (\u2264) olarak verilir.<\/p>\n<p>Tablodan iki sonu\u00e7 \u00e7\u0131kar. Birincisi, ayn\u0131 malzeme t\u00fcr\u00fcnde tipler aras\u0131ndaki fark, t\u00fcrler aras\u0131ndaki farktan b\u00fcy\u00fck olabilir: beyaz EPS 40W ile gri EPS 70 G aras\u0131ndaki fark 0,010 W\/mK&#8217;dir. \u0130kincisi, \u0131s\u0131 iletim katsay\u0131s\u0131 tek ba\u015f\u0131na malzeme se\u00e7tirmez; yang\u0131na tepki s\u0131n\u0131f\u0131, su emmesi, basma dayan\u0131m\u0131 ve uygulama yeri de hesaba girer. Bu \u00f6l\u00e7\u00fctlerin hepsini birlikte ele ald\u0131\u011f\u0131m\u0131z <a href=\"https:\/\/megainsulation.com.tr\/en\/isi-yalitimi-tas-yunu-ve-eps-karsilastirmasi\/\">ta\u015f y\u00fcn\u00fc, EPS ve XPS kar\u015f\u0131la\u015ft\u0131rmas\u0131<\/a> yaz\u0131s\u0131, se\u00e7im i\u00e7in daha uygun bir ba\u015flang\u0131\u00e7t\u0131r. Malzemelerin kendisini tan\u0131mak i\u00e7in <a href=\"https:\/\/megainsulation.com.tr\/en\/tas-yunu-nedir-kullanim-alanlari-ve-avantajlari\/\">ta\u015f y\u00fcn\u00fc nedir<\/a>, <a href=\"https:\/\/megainsulation.com.tr\/en\/eps-kullanim-alanlari\/\">EPS nedir<\/a> And <a href=\"https:\/\/megainsulation.com.tr\/en\/xps-kullanim-alanlari\/\">XPS nedir<\/a> rehberlerine bakabilirsiniz.<\/p>\n<figure><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/megainsulation.com.tr\/wp-content\/uploads\/isi-iletim-katsayisi-nedir-img1-1024x576.webp\" class=\"wp-image-4006 size-large\" width=\"800\" height=\"450\" alt=\"Mega SW-35L ta\u015fy\u00fcn\u00fc mantolama levhalar\u0131 ve \u00fcr\u00fcn paketi\" srcset=\"https:\/\/megainsulation.com.tr\/wp-content\/uploads\/isi-iletim-katsayisi-nedir-img1-1024x576.webp 1024w, https:\/\/megainsulation.com.tr\/wp-content\/uploads\/isi-iletim-katsayisi-nedir-img1-300x169.webp 300w, https:\/\/megainsulation.com.tr\/wp-content\/uploads\/isi-iletim-katsayisi-nedir-img1-768x432.webp 768w, https:\/\/megainsulation.com.tr\/wp-content\/uploads\/isi-iletim-katsayisi-nedir-img1-1536x864.webp 1536w, https:\/\/megainsulation.com.tr\/wp-content\/uploads\/isi-iletim-katsayisi-nedir-img1-18x10.webp 18w, https:\/\/megainsulation.com.tr\/wp-content\/uploads\/isi-iletim-katsayisi-nedir-img1.webp 1920w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption>Mega teknik f\u00f6y\u00fcne g\u00f6re SW-35L ta\u015fy\u00fcn\u00fc mantolama levhas\u0131n\u0131n \u03bbD de\u011feri en fazla 0,035 W\/mK&#8217;dir.<\/figcaption><\/figure>\n<p>Mega Insulation Solutions (Mega Yal\u0131t\u0131m), genel m\u00fcd\u00fcrl\u00fc\u011f\u00fc \u0130stanbul Kavac\u0131k&#8217;ta, fabrikas\u0131 Elaz\u0131\u011f&#8217;da bulunan T\u00fcrk yal\u0131t\u0131m malzemeleri \u00fcreticisidir; ta\u015fy\u00fcn\u00fc, XPS ve EPS \u0131s\u0131 yal\u0131t\u0131m levhalar\u0131n\u0131 Mega markas\u0131yla sunar ve her \u00fcr\u00fcn tipinin \u03bbD de\u011ferini teknik f\u00f6y\u00fcnde beyan eder. Mantolama ve XPS levhalar\u0131n\u0131n f\u00f6ylerine <a href=\"https:\/\/megainsulation.com.tr\/en\/urunler\/mantolama-levhasi\/\">ta\u015fy\u00fcn\u00fc mantolama levhas\u0131<\/a>, <a href=\"https:\/\/megainsulation.com.tr\/en\/urunler\/epsw-beyaz-mantolama-levhasi\/\">beyaz EPS mantolama levhas\u0131<\/a>, <a href=\"https:\/\/megainsulation.com.tr\/en\/urunler\/epsg-gri-mantolama-levhasi\/\">gri EPS mantolama levhas\u0131<\/a> And <a href=\"https:\/\/megainsulation.com.tr\/en\/urunler\/xps-duz\/\">XPS d\u00fcz levha<\/a> sayfalar\u0131ndan ula\u015fabilirsiniz.<\/p>\n<h2>Is\u0131 iletim katsay\u0131s\u0131n\u0131 neler etkiler?<\/h2>\n<p>Bir malzemenin \u0131s\u0131 iletim katsay\u0131s\u0131n\u0131 en \u00e7ok yo\u011funlu\u011fu ve i\u00e7 yap\u0131s\u0131, i\u00e7erdi\u011fi nem ve s\u0131cakl\u0131k belirler. Bu nedenle \u03bb, ayn\u0131 malzeme t\u00fcr\u00fcnde bile tipten tipe ve kullan\u0131m ko\u015fuluna g\u00f6re de\u011fi\u015fir.<\/p>\n<h3>Yo\u011funluk ve i\u00e7 yap\u0131<\/h3>\n<p>Yo\u011funluk ve i\u00e7 yap\u0131, malzemedeki hava bo\u015fluklar\u0131n\u0131n miktar\u0131n\u0131, b\u00fcy\u00fckl\u00fc\u011f\u00fcn\u00fc ve da\u011f\u0131l\u0131m\u0131n\u0131 belirler; ancak \u03bb&#8217;ya etkileri her malzemede ayn\u0131 y\u00f6nde de\u011fildir. Mega teknik f\u00f6ylerine g\u00f6re beyaz EPS levhalarda basma dayan\u0131m\u0131 s\u0131n\u0131f\u0131 y\u00fckseldik\u00e7e \u03bbD genel olarak d\u00fc\u015fer: EPS 40W&#8217;de 0,041, EPS 80W&#8217;de 0,038, EPS 120W&#8217;de 0,034 W\/mK. Ta\u015fy\u00fcn\u00fcnde ise yo\u011funlu\u011fu 150 kg\/m\u00b3 olan SW F150 mantolama levhas\u0131n\u0131n \u03bbD de\u011feri en fazla 0,037 W\/mK, yo\u011funlu\u011fu 40\u201360 kg\/m\u00b3 olan ara b\u00f6lme levhalar\u0131n\u0131nki en fazla 0,035 W\/mK&#8217;dir.<\/p>\n<p>Mantolama levhas\u0131nda y\u00fcksek yo\u011funlu\u011fun kar\u015f\u0131l\u0131\u011f\u0131 mekanik dayan\u0131md\u0131r: SW F150&#8217;nin f\u00f6y\u00fcnde basma dayan\u0131m\u0131 en az 40 kPa, y\u00fczeye dik \u00e7ekme dayan\u0131m\u0131 en az 10 kPa olarak beyan edilir. Yo\u011funluk se\u00e7imini <a href=\"https:\/\/megainsulation.com.tr\/en\/tas-yunu-yogunluk-rehberi\/\">ta\u015f y\u00fcn\u00fc yo\u011funluk<\/a> rehberimizde ayr\u0131nt\u0131l\u0131 olarak anlatt\u0131k.<\/p>\n<p>Katk\u0131 maddeleri de \u03bb&#8217;y\u0131 de\u011fi\u015ftirir. Karbon (grafit) katk\u0131l\u0131 gri EPS levhalar, ayn\u0131 basma dayan\u0131m\u0131 s\u0131n\u0131f\u0131ndaki beyaz levhalardan daha d\u00fc\u015f\u00fck \u03bbD beyan eder: Mega f\u00f6ylerine g\u00f6re bu de\u011fer EPS 50W&#8217;de 0,040, EPS 50 G&#8217;de 0,032 W\/mK&#8217;dir.<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/megainsulation.com.tr\/wp-content\/uploads\/isi-iletim-katsayisi-nedir-img2-1024x576.webp\" class=\"wp-image-4007 size-large\" width=\"800\" height=\"450\" alt=\"Mega gri EPS (EPSG) mantolama levhalar\u0131 ve EPS \u00fcr\u00fcn paketi\" srcset=\"https:\/\/megainsulation.com.tr\/wp-content\/uploads\/isi-iletim-katsayisi-nedir-img2-1024x576.webp 1024w, https:\/\/megainsulation.com.tr\/wp-content\/uploads\/isi-iletim-katsayisi-nedir-img2-300x169.webp 300w, https:\/\/megainsulation.com.tr\/wp-content\/uploads\/isi-iletim-katsayisi-nedir-img2-768x432.webp 768w, https:\/\/megainsulation.com.tr\/wp-content\/uploads\/isi-iletim-katsayisi-nedir-img2-1536x864.webp 1536w, https:\/\/megainsulation.com.tr\/wp-content\/uploads\/isi-iletim-katsayisi-nedir-img2-2048x1152.webp 2048w, https:\/\/megainsulation.com.tr\/wp-content\/uploads\/isi-iletim-katsayisi-nedir-img2-18x10.webp 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption>Mega f\u00f6ylerine g\u00f6re gri EPS (EPSG) tiplerinin \u03bbD de\u011feri 0,031\u20130,036 W\/mK aral\u0131\u011f\u0131ndad\u0131r.<\/figcaption><\/figure>\n<h3>Nem<\/h3>\n<p>Nem \u0131s\u0131 iletim katsay\u0131s\u0131n\u0131 y\u00fckseltir. Su durgun havadan \u00e7ok daha iyi \u0131s\u0131 iletti\u011fi i\u00e7in, g\u00f6zeneklerine su giren bir levha teknik f\u00f6y\u00fcndeki de\u011feri sahada veremez. TS EN 12667 kuru numunelerdeki \u00f6l\u00e7\u00fcmleri tan\u0131mlar ve nemli \u00fcr\u00fcnleri kapsamaz; f\u00f6ydeki \u03bbD bu nedenle kuru malzemenin de\u011feridir.<\/p>\n<p>Toprakla temas eden ve suya maruz kalan yerlerde bu y\u00fczden su emmesi d\u00fc\u015f\u00fck malzeme se\u00e7ilir: Mega teknik f\u00f6ylerine g\u00f6re MEGA XPS levhalar\u0131n tam dald\u0131rmada uzun s\u00fcreli su emmesi hacimce %0,7&#8217;yi ge\u00e7mez. Ta\u015fy\u00fcn\u00fc levhalar\u0131n f\u00f6ylerinde ise k\u0131sa s\u00fcreli su emmesi en fazla 1 kg\/m\u00b2, su buhar\u0131 dif\u00fczyon direnci \u03bc = 1 olarak beyan edilir; levha buhar ge\u00e7irgendir ve duvardaki su buhar\u0131n\u0131n d\u0131\u015far\u0131 \u00e7\u0131kmas\u0131na izin verir. Yal\u0131t\u0131m\u0131n su yal\u0131t\u0131m katman\u0131n\u0131n \u00fcst\u00fcnde kald\u0131\u011f\u0131 ters teras \u00e7at\u0131larda, BRE k\u0131lavuzuna g\u00f6re U de\u011feri hesab\u0131nda beyan de\u011feri yerine hesap de\u011feri kullan\u0131l\u0131r ve ya\u011fmur suyunun etkisi i\u00e7in d\u00fczeltme yap\u0131l\u0131r. Duvar i\u00e7inde nem birikmesinin nedenlerinden biri olan yo\u011fu\u015fmay\u0131 <a href=\"https:\/\/megainsulation.com.tr\/en\/yogusma-nedir\/\">yo\u011fu\u015fma nedir<\/a> yaz\u0131m\u0131zda ele ald\u0131k.<\/p>\n<h3>S\u0131cakl\u0131k<\/h3>\n<p>Is\u0131 iletim katsay\u0131s\u0131 s\u0131cakl\u0131kla da de\u011fi\u015fir. \u00dcr\u00fcnler ayn\u0131 ko\u015fulda kar\u015f\u0131la\u015ft\u0131r\u0131labilsin diye teknik f\u00f6ylerde \u03bbD, 10 \u00b0C ortalama s\u0131cakl\u0131k i\u00e7in beyan edilir. \u00c7ok y\u00fcksek ya da \u00e7ok d\u00fc\u015f\u00fck s\u0131cakl\u0131kta \u00e7al\u0131\u015fan tesisat ve sanayi uygulamalar\u0131nda o s\u0131cakl\u0131ktaki \u03bb de\u011feri ayr\u0131ca dikkate al\u0131nmal\u0131d\u0131r.<\/p>\n<h2>Is\u0131 iletim katsay\u0131s\u0131 nas\u0131l \u00f6l\u00e7\u00fcl\u00fcr? Beyan edilen \u03bbD ne demek?<\/h2>\n<p>Is\u0131 iletim katsay\u0131s\u0131 laboratuvarda, numuneden kararl\u0131 bir \u0131s\u0131 ak\u0131\u015f\u0131 ge\u00e7irilerek \u00f6l\u00e7\u00fcl\u00fcr. Yal\u0131t\u0131m \u00fcr\u00fcnlerinde kullan\u0131lan iki y\u00f6ntem, korumal\u0131 s\u0131cak plaka ve \u0131s\u0131 ak\u0131\u015f \u00f6l\u00e7er y\u00f6ntemleridir; ikisi de TS EN 12667&#8217;de tan\u0131mlan\u0131r.<\/p>\n<h3>Korumal\u0131 s\u0131cak plaka ve \u0131s\u0131 ak\u0131\u015f \u00f6l\u00e7er y\u00f6ntemi<\/h3>\n<p>\u0130ki y\u00f6ntemde de levha numunesi s\u0131cak ve so\u011fuk plaka aras\u0131na yerle\u015ftirilir; sistem dengeye geldi\u011finde numuneden ge\u00e7en \u0131s\u0131 ak\u0131\u015f\u0131, iki y\u00fcz aras\u0131ndaki s\u0131cakl\u0131k fark\u0131 ve kal\u0131nl\u0131k \u00f6l\u00e7\u00fcl\u00fcr. Korumal\u0131 s\u0131cak plakada \u00f6l\u00e7\u00fcm b\u00f6lgesini \u00e7evreleyen koruma b\u00f6lgesi \u0131s\u0131n\u0131n yanlardan ka\u00e7mas\u0131n\u0131 \u00f6nler; \u0131s\u0131 ak\u0131\u015f \u00f6l\u00e7erde ise numuneden ge\u00e7en ak\u0131\u015f kalibre edilmi\u015f \u0131s\u0131 ak\u0131\u015f\u0131 alg\u0131lay\u0131c\u0131lar\u0131yla okunur. \u00d6l\u00e7\u00fclen \u0131s\u0131l diren\u00e7ten \u03bb = d \/ R ba\u011f\u0131nt\u0131s\u0131yla \u0131s\u0131 iletim katsay\u0131s\u0131 bulunur.<\/p>\n<p>TS EN 12667, \u0131s\u0131l direnci en az 0,5 m\u00b2K\/W olan kuru numuneler i\u00e7in ge\u00e7erlidir. Cihaza s\u0131\u011fmayacak kadar kal\u0131n \u00fcr\u00fcnlerde TS EN 12939 uygulan\u0131r; bu standart, kal\u0131nl\u0131k etkisinin \u00f6nemli olup olmad\u0131\u011f\u0131n\u0131 ve kal\u0131n bir \u00fcr\u00fcn\u00fcn \u0131s\u0131l direncinin ondan kesilen dilimlerin diren\u00e7leri toplanarak hesaplan\u0131p hesaplanamayaca\u011f\u0131n\u0131 de\u011ferlendirmek i\u00e7in kurallar da verir. Mega&#8217;n\u0131n ta\u015fy\u00fcn\u00fc teknik f\u00f6ylerinde \u03bbD i\u00e7in ba\u015fvuru standard\u0131 olarak bu iki standart g\u00f6sterilir.<\/p>\n<h3>Beyan de\u011feri (\u03bbD) ile hesap de\u011feri aras\u0131ndaki fark<\/h3>\n<p>\u03bbD, \u00fcreticinin \u00fcr\u00fcn standard\u0131na g\u00f6re beyan etti\u011fi \u0131s\u0131l iletkenliktir: ta\u015fy\u00fcn\u00fc i\u00e7in TS EN 13162, EPS i\u00e7in TS EN 13163, XPS i\u00e7in TS EN 13164. Tek bir \u00f6l\u00e7\u00fcm\u00fcn sonucu de\u011fildir; BRE k\u0131lavuzuna g\u00f6re beyan de\u011feri, %90 g\u00fcven d\u00fczeyinde \u00fcretimin en az %90&#8217;\u0131n\u0131n bu de\u011fere e\u015fit ya da ondan daha iyi \u0131s\u0131l performans g\u00f6sterdi\u011fi anlam\u0131na gelir.<\/p>\n<p>Hesap (tasar\u0131m) de\u011feri ise U de\u011feri hesab\u0131nda kullan\u0131lan \u0131s\u0131l iletkenliktir; EN ISO 6946&#8217;daki hesap y\u00f6ntemi bu de\u011ferlere dayan\u0131r. BRE k\u0131lavuzu, m\u00fcmk\u00fcn olan her durumda \u00fcreticinin beyan etti\u011fi de\u011ferin, beyan de\u011feri yoksa EN ISO 10456&#8217;daki tablo de\u011ferlerinin kullan\u0131lmas\u0131n\u0131 \u00f6nerir. T\u00fcrkiye&#8217;de \u0131s\u0131 yal\u0131t\u0131m projesi TS 825&#8217;e g\u00f6re haz\u0131rlan\u0131r; TS 825 tablolar\u0131nda yer almayan malzemeler i\u00e7in TSE Ulusal Teknik Onay ile belirlenen hesap de\u011feri kullan\u0131labilir. \u00dcr\u00fcn standartlar\u0131n\u0131n kapsam\u0131n\u0131 <a href=\"https:\/\/megainsulation.com.tr\/en\/yalitim-standartlari-ts-en\/\">yal\u0131t\u0131m standartlar\u0131<\/a> yaz\u0131m\u0131zda anlatt\u0131k.<\/p>\n<h2>Ayn\u0131 \u0131s\u0131l diren\u00e7 i\u00e7in ne kadar kal\u0131nl\u0131k gerekir?<\/h2>\n<p>Gereken kal\u0131nl\u0131k, hedeflenen \u0131s\u0131l direncin \u03bb ile \u00e7arp\u0131lmas\u0131yla bulunur: d = R \u00d7 \u03bb. \u03bb d\u00fc\u015ft\u00fck\u00e7e ayn\u0131 \u0131s\u0131l diren\u00e7 daha ince bir levhayla sa\u011flan\u0131r.<\/p>\n<p>A\u015fa\u011f\u0131daki tabloda 2,0 m\u00b2K\/W \u0131s\u0131l diren\u00e7 i\u00e7in gereken kal\u0131nl\u0131k, Mega teknik f\u00f6ylerindeki \u03bbD de\u011ferleriyle hesapland\u0131; kar\u015f\u0131la\u015ft\u0131rma i\u00e7in betonarme de eklendi.<\/p>\n<table>\n<thead>\n<tr>\n<th>Malzeme ve tip<\/th>\n<th>\u03bbD veya \u03bb (W\/mK)<\/th>\n<th>R = 2,0 m\u00b2K\/W i\u00e7in kal\u0131nl\u0131k (yakla\u015f\u0131k)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Gri EPS, EPS 70 G<\/td>\n<td>0,031<\/td>\n<td>6,2 cm<\/td>\n<\/tr>\n<tr>\n<td>MEGA XPS T3000<\/td>\n<td>0,035<\/td>\n<td>7,0 cm<\/td>\n<\/tr>\n<tr>\n<td>Ta\u015fy\u00fcn\u00fc, MEGA SW-35L<\/td>\n<td>\u22640,035<\/td>\n<td>7,0 cm<\/td>\n<\/tr>\n<tr>\n<td>Ta\u015fy\u00fcn\u00fc, MEGA SW F150<\/td>\n<td>\u22640,037<\/td>\n<td>7,4 cm<\/td>\n<\/tr>\n<tr>\n<td>Beyaz EPS, EPS 50W<\/td>\n<td>0,040<\/td>\n<td>8,0 cm<\/td>\n<\/tr>\n<tr>\n<td>Betonarme (%1 donat\u0131, BRE de\u011feri)<\/td>\n<td>2,30<\/td>\n<td>460 cm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Uygulamada hesaptan \u00e7\u0131kan kal\u0131nl\u0131k, \u00fcr\u00fcn f\u00f6y\u00fcndeki kal\u0131nl\u0131k se\u00e7eneklerinden bir \u00fcsttekine yuvarlan\u0131r. \u00d6rne\u011fin SW F150 levhan\u0131n f\u00f6y\u00fcnde 70 ve 80 mm se\u00e7enekleri vard\u0131r; 7,4 cm \u00e7\u0131kan bir hesap i\u00e7in 80 mm&#8217;lik levha se\u00e7ilir.<\/p>\n<h3>\u00d6rnek hesap: yal\u0131t\u0131ml\u0131 ve yal\u0131t\u0131ms\u0131z betonarme duvar\u0131n U de\u011feri<\/h3>\n<p>20 cm kal\u0131nl\u0131\u011f\u0131nda betonarme bir perde duvar d\u00fc\u015f\u00fcnelim. Hesab\u0131 sade tutmak i\u00e7in s\u0131va ve yap\u0131\u015ft\u0131r\u0131c\u0131 katmanlar\u0131 ile d\u00fcbellerin etkisi ihmal edildi; y\u00fczey diren\u00e7leri EN ISO 6946&#8217;daki duvar de\u011ferleridir.<\/p>\n<ol>\n<li><strong>Yal\u0131t\u0131ms\u0131z duvar:<\/strong> Betonarmenin \u0131s\u0131l direnci 0,20 \/ 2,30 \u2248 0,087 m\u00b2K\/W&#8217;dir. RT = 0,13 + 0,087 + 0,04 = 0,257 m\u00b2K\/W, buradan U = 1 \/ 0,257 \u2248 3,89 W\/m\u00b2K.<\/li>\n<li><strong>8 cm SW F150 ta\u015fy\u00fcn\u00fc levhayla:<\/strong> Levhan\u0131n \u0131s\u0131l direnci 0,08 \/ 0,037 \u2248 2,16 m\u00b2K\/W&#8217;dir. RT = 0,13 + 0,087 + 2,16 + 0,04 \u2248 2,42 m\u00b2K\/W, buradan U = 1 \/ 2,42 \u2248 0,41 W\/m\u00b2K.<\/li>\n<li><strong>Is\u0131 ak\u0131\u015f\u0131na \u00e7evirme:<\/strong> \u0130\u00e7erisi ile d\u0131\u015far\u0131s\u0131 aras\u0131nda 20 \u00b0C fark oldu\u011funda yal\u0131t\u0131ms\u0131z duvar\u0131n her metrekaresinden yakla\u015f\u0131k 78 W, yal\u0131t\u0131ml\u0131 duvar\u0131n her metrekaresinden yakla\u015f\u0131k 8 W \u0131s\u0131 ge\u00e7er (Q = U \u00d7 A \u00d7 \u0394T).<\/li>\n<\/ol>\n<p>Ger\u00e7ek bir binada s\u0131va katmanlar\u0131, d\u00fcbeller, pencere \u00e7evreleri ve d\u00f6\u015feme birle\u015fimleri sonucu de\u011fi\u015ftirir. Yal\u0131t\u0131m kal\u0131nl\u0131\u011f\u0131, TS 825&#8217;e g\u00f6re haz\u0131rlanan \u0131s\u0131 yal\u0131t\u0131m projesiyle belirlenir; kal\u0131nl\u0131kla ilgili pratik sorular\u0131 <a href=\"https:\/\/megainsulation.com.tr\/en\/yalitimda-yeni-donem\/\">mantolama ka\u00e7 cm olmal\u0131<\/a> yaz\u0131m\u0131zda yan\u0131tlad\u0131k.<\/p>\n<blockquote>\n<p><strong>MegaUsta&#8217;dan uygulama notu:<\/strong> Teknik f\u00f6ydeki \u03bbD de\u011feri, kuru ve bo\u015fluksuz uygulanm\u0131\u015f levha i\u00e7in ge\u00e7erlidir. Levhalar\u0131 \u015fantiyede ambalaj\u0131nda ve \u00fcst\u00fc \u00f6rt\u00fcl\u00fc saklay\u0131n, \u0131slanm\u0131\u015f levhay\u0131 kurumadan uygulamay\u0131n; EPS ve XPS levhalar\u0131 f\u00f6ylerindeki uyar\u0131 gere\u011fi g\u00fcne\u015f \u0131\u015f\u0131\u011f\u0131ndan koruyun. Levhalar\u0131 derzleri \u015fa\u015f\u0131rtmal\u0131 ve aralar\u0131nda bo\u015fluk b\u0131rakmadan yerle\u015ftirin; a\u00e7\u0131k kalan derzler, f\u00f6ydeki de\u011ferin duvara aynen yans\u0131mas\u0131n\u0131 engeller.<\/p>\n<\/blockquote>\n<h2>S\u0131k\u00e7a Sorulan Sorular<\/h2>\n<h3>Is\u0131 iletim katsay\u0131s\u0131 b\u00fcy\u00fckse ne olur?<\/h3>\n<p>Is\u0131 iletim katsay\u0131s\u0131 b\u00fcy\u00fckse malzeme \u0131s\u0131y\u0131 kolay iletir ve iyi bir yal\u0131tkan say\u0131lmaz. Ayn\u0131 kal\u0131nl\u0131kta \u0131s\u0131l direnci d\u00fc\u015f\u00fck kal\u0131r, yap\u0131 eleman\u0131n\u0131n U de\u011feri y\u00fckselir ve daha fazla \u0131s\u0131 kaybedilir. \u00d6rne\u011fin BRE k\u0131lavuzu %1 donat\u0131l\u0131 betonarme i\u00e7in 2,30 W\/mK \u00f6nerirken, Mega ta\u015fy\u00fcn\u00fc, EPS ve XPS levhalar\u0131n beyan de\u011ferleri 0,031\u20130,042 W\/mK aral\u0131\u011f\u0131ndad\u0131r. Betonarme y\u00fczeyler bu nedenle \u0131s\u0131 yal\u0131t\u0131m levhas\u0131yla kaplan\u0131r.<\/p>\n<h3>Is\u0131 iletim katsay\u0131s\u0131n\u0131n birimi nedir?<\/h3>\n<p>Is\u0131 iletim katsay\u0131s\u0131n\u0131n birimi W\/mK&#8217;dir, yani watt b\u00f6l\u00fc metre kelvindir; W\/(m\u00b7K) olarak da yaz\u0131l\u0131r. Bu birim, 1 metre kal\u0131nl\u0131\u011f\u0131ndaki bir katman\u0131n 1 m\u00b2 y\u00fczeyinden, iki y\u00fcz\u00fc aras\u0131nda 1 K s\u0131cakl\u0131k fark\u0131 varken ge\u00e7en \u0131s\u0131 ak\u0131\u015f\u0131n\u0131 watt cinsinden g\u00f6sterir. Kelvin cinsinden s\u0131cakl\u0131k fark\u0131 santigrat derece cinsinden farka e\u015fit oldu\u011fu i\u00e7in W\/m\u00b0C yaz\u0131m\u0131 da ayn\u0131 anlam\u0131 ta\u015f\u0131r.<\/p>\n<h3>\u03bb ile U de\u011feri aras\u0131ndaki fark nedir?<\/h3>\n<p>\u03bb bir malzemenin \u00f6zelli\u011fidir ve kal\u0131nl\u0131\u011fa ba\u011fl\u0131 de\u011fildir; U de\u011feri ise duvar, \u00e7at\u0131 ya da d\u00f6\u015feme gibi bir yap\u0131 eleman\u0131n\u0131n b\u00fct\u00fcn katmanlar\u0131yla birlikte \u0131s\u0131 ge\u00e7irgenli\u011fini g\u00f6sterir. \u03bb&#8217;n\u0131n birimi W\/mK, U&#8217;nun birimi W\/m\u00b2K&#8217;dir. U, katmanlar\u0131n \u0131s\u0131l diren\u00e7leri (R = d\/\u03bb) ile i\u00e7 ve d\u0131\u015f y\u00fczey diren\u00e7leri toplan\u0131p bire b\u00f6l\u00fcnerek bulunur. \u0130kisinde de d\u00fc\u015f\u00fck de\u011fer daha iyi yal\u0131t\u0131m demektir.<\/p>\n<h3>En d\u00fc\u015f\u00fck \u0131s\u0131 iletim katsay\u0131s\u0131na sahip yal\u0131t\u0131m malzemesi hangisi?<\/h3>\n<p>Mega&#8217;n\u0131n teknik f\u00f6ylerindeki ta\u015fy\u00fcn\u00fc, EPS ve XPS levhalar aras\u0131nda en d\u00fc\u015f\u00fck beyan de\u011feri karbon (grafit) katk\u0131l\u0131 gri EPS 70 G&#8217;ye aittir: \u03bbD 0,031 W\/mK. MEGA XPS T1500, T2000 ve T3000&#8217;in \u03bbD de\u011feri 0,035, SW-35L ta\u015fy\u00fcn\u00fc levhan\u0131nki en fazla 0,035 W\/mK&#8217;dir; beyaz EPS tipleri 0,034\u20130,042 W\/mK aras\u0131nda kal\u0131r. Se\u00e7im yaln\u0131z \u03bb&#8217;ya g\u00f6re yap\u0131lmaz; kullan\u0131m yeri, su emmesi, basma dayan\u0131m\u0131 ve yang\u0131na tepki s\u0131n\u0131f\u0131 da belirleyicidir.<\/p>\n<h3>Nem \u0131s\u0131 iletim katsay\u0131s\u0131n\u0131 nas\u0131l etkiler?<\/h3>\n<p>Nem \u0131s\u0131 iletim katsay\u0131s\u0131n\u0131 y\u00fckseltir. Malzemenin g\u00f6zeneklerindeki havan\u0131n yerini su ald\u0131\u011f\u0131nda \u0131s\u0131 daha kolay iletilir ve levha teknik f\u00f6y\u00fcndeki performans\u0131 sahada veremez. F\u00f6ylerdeki \u03bbD de\u011ferleri kuru numunelerle \u00f6l\u00e7\u00fcl\u00fcr. Bu y\u00fczden levhalar \u015fantiyede \u0131slanmaya kar\u015f\u0131 korunur, toprakla ve suyla temas eden yerlerde su emmesi d\u00fc\u015f\u00fck malzeme se\u00e7ilir; MEGA XPS levhalar\u0131n uzun s\u00fcreli su emmesi hacimce %0,7&#8217;yi ge\u00e7mez.<\/p>\n<h2>Kaynaklar<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.cibse.org\/media\/wzrjrf3l\/conventions-for-u-value-calculations.pdf\" target=\"_blank\" rel=\"noopener\">BRE, B. Anderson ve L. Kosmina: Conventions for U-value calculations (BR 443, 2019 bask\u0131s\u0131), CIBSE \u00fczerinden PDF<\/a><\/li>\n<li><a href=\"https:\/\/www.austrian-standards.at\/en\/shop\/onorm-en-12667-2025-11-01~p4518352\" target=\"_blank\" rel=\"noopener\">EN 12667: Korumal\u0131 s\u0131cak plaka ve \u0131s\u0131 ak\u0131\u015f \u00f6l\u00e7er y\u00f6ntemleriyle \u0131s\u0131l diren\u00e7 tayini, y\u00fcksek ve orta \u0131s\u0131l diren\u00e7li \u00fcr\u00fcnler (Austrian Standards k\u00fcnyesi)<\/a><\/li>\n<li><a href=\"https:\/\/www.austrian-standards.at\/en\/shop\/onorm-en-12939-2025-11-01~p4518363\" target=\"_blank\" rel=\"noopener\">EN 12939: Korumal\u0131 s\u0131cak plaka ve \u0131s\u0131 ak\u0131\u015f \u00f6l\u00e7er y\u00f6ntemleriyle \u0131s\u0131l diren\u00e7 tayini, kal\u0131n \u00fcr\u00fcnler (Austrian Standards k\u00fcnyesi)<\/a><\/li>\n<li><a href=\"https:\/\/austrian-standards.at\/en\/shop\/iso-6946-2017-2017-06-21~p2320425\" target=\"_blank\" rel=\"noopener\">ISO 6946:2017: Yap\u0131 bile\u015fenleri ve yap\u0131 elemanlar\u0131, \u0131s\u0131l diren\u00e7 ve \u0131s\u0131l ge\u00e7irgenlik hesap y\u00f6ntemleri (Austrian Standards k\u00fcnyesi)<\/a><\/li>\n<li><a href=\"https:\/\/megainsulation.com.tr\/wp-content\/uploads\/mega-tds\/mega-sw-f150-mantolama-levhasi-tds.pdf\">Mega SW F150 ta\u015fy\u00fcn\u00fc mantolama levhas\u0131 teknik f\u00f6y\u00fc (PDF)<\/a><\/li>\n<li><a href=\"https:\/\/megainsulation.com.tr\/wp-content\/uploads\/mega-tds\/mega-sw-35l-tds.pdf\">Mega SW-35L ta\u015fy\u00fcn\u00fc mantolama levhas\u0131 teknik f\u00f6y\u00fc (PDF)<\/a><\/li>\n<li><a href=\"https:\/\/megainsulation.com.tr\/wp-content\/uploads\/mega-tds\/ara-bolme-levhasi-tds.pdf\">Mega ta\u015fy\u00fcn\u00fc ara b\u00f6lme levhas\u0131 teknik f\u00f6y\u00fc (PDF)<\/a><\/li>\n<li><a href=\"https:\/\/megainsulation.com.tr\/wp-content\/uploads\/mega-tds\/mega-eps-40w-40u-w-50w-tds.pdf\">Mega EPS 40W, 40U-W ve 50W beyaz EPS levha teknik f\u00f6y\u00fc (PDF)<\/a><\/li>\n<li><a href=\"https:\/\/megainsulation.com.tr\/wp-content\/uploads\/mega-tds\/mega-eps-60w-80w-90w-tds.pdf\">Mega EPS 60W, 80W ve 90W beyaz EPS levha teknik f\u00f6y\u00fc (PDF)<\/a><\/li>\n<li><a href=\"https:\/\/megainsulation.com.tr\/wp-content\/uploads\/mega-tds\/mega-eps-100w-110w-120w-tds.pdf\">Mega EPS 100W, 110W ve 120W beyaz EPS levha teknik f\u00f6y\u00fc (PDF)<\/a><\/li>\n<li><a href=\"https:\/\/megainsulation.com.tr\/wp-content\/uploads\/mega-tds\/mega-eps-50-60-70-g-tds.pdf\">Mega EPS 50 G, 60 G ve 70 G gri EPS levha teknik f\u00f6y\u00fc (PDF)<\/a><\/li>\n<li><a href=\"https:\/\/megainsulation.com.tr\/wp-content\/uploads\/mega-tds\/mega-xps-t3000-tds.pdf\">MEGA XPS T3000 teknik f\u00f6y\u00fc (PDF)<\/a><\/li>\n<li><a href=\"https:\/\/megainsulation.com.tr\/en\/dokumanlar\/\">Mega Yal\u0131t\u0131m Dok\u00fcmanlar sayfas\u0131: teknik f\u00f6yler ve belgeler<\/a><\/li>\n<\/ul>\n<p>Bir levhan\u0131n \u03bbD ve \u0131s\u0131l diren\u00e7 de\u011ferlerini kar\u015f\u0131la\u015ft\u0131r\u0131rken her zaman \u00fcr\u00fcn tipinin teknik f\u00f6y\u00fcne bak\u0131n. Mega \u00fcr\u00fcnlerinin f\u00f6ylerine <a href=\"https:\/\/megainsulation.com.tr\/en\/urun-kategori\/tasyunu\/\">ta\u015fy\u00fcn\u00fc<\/a>, <a href=\"https:\/\/megainsulation.com.tr\/en\/urun-kategori\/eps\/\">EPS levha<\/a> And <a href=\"https:\/\/megainsulation.com.tr\/en\/urun-kategori\/xps\/\">XPS levha<\/a> sayfalar\u0131m\u0131zdan ula\u015fabilir, projenize uygun tip ve kal\u0131nl\u0131k i\u00e7in <a href=\"https:\/\/megainsulation.com.tr\/en\/iletisim\/\">ileti\u015fim sayfam\u0131zdan<\/a> teknik ekibimize yazabilirsiniz.<\/p>\n<p><em>Son g\u00fcncelleme: 30 Ekim 2026. Haz\u0131rlayan: Mega Yal\u0131t\u0131m Teknik Ekibi.<\/em><\/p>","protected":false},"excerpt":{"rendered":"<p>Is\u0131 iletim katsay\u0131s\u0131 (\u03bb) nedir, W\/mK ne anlat\u0131r? R ve U de\u011feriyle ili\u015fkisini, \u00f6rnek hesab\u0131 ve Mega ta\u015fy\u00fcn\u00fc, EPS, XPS \u03bbD de\u011ferlerini anlatt\u0131k.<\/p>","protected":false},"author":1,"featured_media":3447,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[75],"tags":[94,238,101,342,239,343,305,189,93],"class_list":["post-3446","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-isi-yalitimi","tag-eps","tag-isi-iletim-katsayisi","tag-isi-yalitimi","tag-isil-iletkenlik","tag-lambda-degeri","tag-r-degeri","tag-tasyunu","tag-u-degeri","tag-xps"],"_links":{"self":[{"href":"https:\/\/megainsulation.com.tr\/en\/wp-json\/wp\/v2\/posts\/3446","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/megainsulation.com.tr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/megainsulation.com.tr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/megainsulation.com.tr\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/megainsulation.com.tr\/en\/wp-json\/wp\/v2\/comments?post=3446"}],"version-history":[{"count":2,"href":"https:\/\/megainsulation.com.tr\/en\/wp-json\/wp\/v2\/posts\/3446\/revisions"}],"predecessor-version":[{"id":4008,"href":"https:\/\/megainsulation.com.tr\/en\/wp-json\/wp\/v2\/posts\/3446\/revisions\/4008"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/megainsulation.com.tr\/en\/wp-json\/wp\/v2\/media\/3447"}],"wp:attachment":[{"href":"https:\/\/megainsulation.com.tr\/en\/wp-json\/wp\/v2\/media?parent=3446"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/megainsulation.com.tr\/en\/wp-json\/wp\/v2\/categories?post=3446"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/megainsulation.com.tr\/en\/wp-json\/wp\/v2\/tags?post=3446"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}