D\u00f6ner bir kap\u0131, silindirik bir bi\u00e7inde d\u00f6nen \u00e7oklu panellerden olu\u015fur.\u00a0\u0130nsanlar\u0131n ge\u00e7i\u015fi i\u00e7in panellerden bir tanesi kapan\u0131rken di\u011feri a\u00e7\u0131lmaktad\u0131r.\u00a0D\u00f6ner bir kap\u0131, hava ge\u00e7irmez olmasa da, \u00f6zellikle yo\u011fun bir caddenin kenar\u0131nda, \u00f6nemli miktarda g\u00fcr\u00fclt\u00fcn\u00fcn, so\u011fuk veya s\u0131cak havan\u0131n ve hava kirlili\u011finin binaya girmesine engel olur. Bilindi\u011fi gibi, klima ile so\u011futulan veya \u0131s\u0131t\u0131lan bir binada bir kap\u0131 a\u00e7\u0131ld\u0131\u011f\u0131nda enerji kayb\u0131 olur. Bina i\u00e7erisindeki so\u011fuk veya s\u0131cak hava kap\u0131dan d\u0131\u015far\u0131 \u00e7\u0131kar. D\u00f6ner bir kap\u0131 bu \u0131s\u0131 kayb\u0131n\u0131 en aza indirmeye yaramaktad\u0131r.<\/p>\n
Bir dahaki sefere d\u00f6ner bir kap\u0131n\u0131n panelleri aras\u0131na girdi\u011finizde, yak\u0131ndan bir g\u00f6z at\u0131n. \u00c7o\u011fu d\u00f6ner kap\u0131 \u00fc\u00e7 veya d\u00f6rt ba\u011f\u0131ms\u0131z panelden olu\u015fur.\u00a0 Paneller, camla \u00e7evrilmi\u015f bir silindir i\u00e7inde d\u00f6nen merkezi bir \u015fafttan d\u0131\u015far\u0131 do\u011fru uzan\u0131rlar. Her panelin yan taraf\u0131nda, panel ve silindir aras\u0131nda hava ge\u00e7i\u015fini engelleyecek bir conta bulunur. D\u00f6ner bir kap\u0131n\u0131n hareketi, birisi kap\u0131 panellerinden birini iterek veya kap\u0131lar\u0131 otomatik olarak d\u00f6nd\u00fcren bir motorla sa\u011flan\u0131r.<\/p>\n
MIT lisans\u00fcst\u00fc \u00f6\u011frencileri taraf\u0131ndan 2006 y\u0131l\u0131nda yap\u0131lan bir ara\u015ft\u0131rmada, kamp\u00fcs binas\u0131nda d\u00f6nen kap\u0131larla, normal a\u00e7\u0131lan kap\u0131lar\u0131n kullan\u0131mlar\u0131 izlendi. Normal kap\u0131, d\u00f6ner kap\u0131dan 8 kat daha fazla havan\u0131n ge\u00e7mesine izin veriyordu. \u00d6\u011frenciler, binaya giren ve \u00e7\u0131kanlar\u0131n, d\u00f6ner kap\u0131lar\u0131 kulland\u0131klar\u0131nda, yerel hava ko\u015fullar\u0131n\u0131 da dikkate alarak enerji tasarrufunun y\u0131lda 75.000 kilowatt-saat civar\u0131nda olaca\u011f\u0131n\u0131 hesaplad\u0131lar. Bu ara\u015ft\u0131rmadan, binay\u0131 \u0131s\u0131tmak veya so\u011futmak i\u00e7in normalde kullan\u0131lan enerjinin miktar\u0131n\u0131 azaltt\u0131\u011f\u0131 ve yakla\u015f\u0131k 15 ton (13,6 metrik ton) karbondioksitin atmosfere sal\u0131nmas\u0131n\u0131 \u00f6nleyece\u011fi sonucu \u00e7\u0131kt\u0131.<\/p>\n
D\u00f6ner bir kap\u0131, dahili ve harici hava bas\u0131n\u00e7 farklar\u0131n\u0131 da azaltmaktad\u0131r. Bir g\u00f6kdelenin lobisine girmek i\u00e7in normal bir kap\u0131y\u0131 \u00e7ekmekte zorland\u0131ysan\u0131z, muhtemelen bu bas\u0131n\u00e7 de\u011fi\u015fikli\u011fini ya\u015fad\u0131n\u0131z demektir. Bununla birlikte, d\u00f6ner bir kap\u0131, havan\u0131n neredeyse sabit bir h\u0131zda binaya \u00e7\u0131k\u0131p\u00a0 girmesini sa\u011flar ve b\u00fcy\u00fck bas\u0131n\u00e7 de\u011fi\u015fikliklerini ortadan kald\u0131r\u0131r.<\/p>\n
D\u00f6ner kap\u0131 genel olarak ilk icat edildi\u011fi tasar\u0131m\u0131yla ayn\u0131 kald\u0131. D\u00fcnyadaki d\u00f6ner bir kap\u0131 i\u00e7in yap\u0131lan ilk patent ba\u015fvurusu, 1881’de Alman mucidi H. Bockhacker’a aittir ancak o zaman bu fikir ger\u00e7e\u011fe d\u00f6n\u00fc\u015fmedi ve herhangi bir ba\u015far\u0131 yakalayamad\u0131.<\/p>\n
1888’de Pennsylvania’da ya\u015fayan Theophilus Van Kannel<\/strong>, enerji a\u00e7\u0131s\u0131ndan verimli ve kap\u0131 \u00e7er\u00e7evesi ile uyuml\u0131 hava s\u0131y\u0131rmal\u0131 \u00fc\u00e7 y\u00f6nl\u00fc f\u0131rt\u0131na kap\u0131s\u0131 (three-way storm door) i\u00e7in ilk ABD patentini ald\u0131. \u00dcr\u00fcn\u00fcn\u00fc \u00fcretmek i\u00e7in kendi \u015firketi Van Kannel Revolving Door Co.’yu kurdu. 1907’de Van Kannel bunu International Steel \u015firketine satt\u0131. (bug\u00fcn International Revolving Door Co. \u015firketi olarak bilinir)<\/p>\n