Hnub ci iav yog ib hom ntawm cov qhov rai thiab cov khoom siv hauv tsev, nws yog siv los thaiv cov hluav taws xob tshav kub, uas yog qhov ntau ntawm tshav kub los ntawm iav thiab mus rau lwm qhov chaw nyob sab nraud. Hom khob no yuav luag siv nyob rau hauv cov qhov rais ntawm lub chaw ua haujlwm hauv tsev thiab hauv tsev. Qhov siv nws lub tsheb thiab kev lag luam tej zaum, feem ntau nyob hauv cov khoom vaj khoom tsev ntawm lub tsev txawb lossis tshuab uas muaj ntau lub hnub ci hluav taws xob.
Muaj ntau ntau coatings uas tau ua ntawv thov, txhua yam nrog nws tus kheej specifications.Most designs yog tsim los txo cov cua kub nqus thiab txhim kho qhov hluav taws xob, ob qho tib si ntawm yuav txo cov nqi zog.Qhov qauv, hnub ci iav yog lub sijhawm ua ke ntawm hnub ci tshuab thiab txheem iav .Ntawm ntawm cov qhov rais no tsis muaj dab tsi txawv nrog lub qhov rais nruab nrab, lawv sib npaug sib npaug thiab feem ntau tso cai rau tib lub teeb nkag mus rau hauv. Lawv feem ntau tsis pub nws, lossis tsawg kawg tsis pub ntau npaum li ntawd, hluav taws xob, uas yog qhov nyiaj ntawm lub zog uas tau kub tuag los ntawm lub hnub.Qhov no yog tiav los ntawm ib qho pom txheej uas tau ua ntawv thov rau lub khob ua ntej installation.Thaum feem ntau, lub txheej yog tas mus li thiab tsim rau lub neej ntawm cov iav. Vim li cas lawv siv hom iav , nws tseem ceeb heev kom txo cov cua sov, tab sis cia hnub ci tuaj yeem nkag mus rau kev sov siab, kuj yog lub npe hu ua "solar gain". "Nws tseem ceeb heev rau ob peb yam, tiam sis txo cov nqi zog yog qhov tseem ceeb tshaj plaws." Windows yog ib qho tseem ceeb ntawm kev coj lub teeb nyob rau sab nraud, tab sis lawv kuj nyuab cais tawm. Cov ntsiab sab nraud, txawm tias sov los yog txias, feem ntau yooj yim dua mus rau hauv lub qhov rais tshaj li ntawm phab ntsa lossis qhov rooj, uas muaj ntau heev ua nrog cov iav ntawm lub khob xwb. ib txheej ntawm iav, thiaj li ua kom lub zog ntawm lub hnub, nws yog ib qho zoo kawg nkaus pab nyob rau hauv cov nqe lus ntawm lub zog reserves, thiab cov hom kev kawm siab iav yog dav siv nyob rau hauv ntau industries.Recent cov kev kho tshiab hauv solar technology, yam tsawg kawg hauv iav, muaj cov khoom laminating uas tuaj yeem tuav lub hnub ci zog.Qhov no lub zog uas muaj concentrated solar energy (CSP) muaj kev cuam tshuam kev ua haujlwm thiab ua haujlwm ntev.