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Inomhusvärme
Av: Zehra Tbena
Inledning
- Syftet med detta projekt ge er uppfattning på hur värmeledning, konvektion,
strålning fungerar genom englas resp tvåglasfönster
Värmeledning: är molekylernas och atomernas rörelse. Deras rörelse går alltid
varmt till kallt för att uppnå jämvikt
Konvektion: är materiaförflyttning som sker på makronivå
Strålning: på en solig dag kommer värmestrålningen att tillföra en stor effekt på
värmeöverföringen och ger då en varmare inomhusklimat
Teori
Teori
Härledning av formel 5
Antaganden
Värmeledning
U-värde Värmeledning
Formel
Englas Tvåglas
Värmeledning + Konvektion
Tvåglasfönster
U-värde Konvektion + Konduktion
Englas Tvåglas
När temperaturen utomhus sjunker väldigt hastigt kan det även bildas kondens på insidan av
fönster. Detta bildas då den kalla luften kyler ner fönstrets insida så pass mycket att den relativa
fuktigheten inomhus uppnår 100 % och bildar kondens
Strålning
Avslutning
- Lägre U-värde → bättre värmeisolering → tvåglasfönster
- Tjockare material → bättre värmeisolering
- För mer korrekta värde bör man ta hänsyn till: väderförhållande, ålder och
täthet på glas, persienn (öppen→ bildas fack→ större flöde), strålning (
påverkar mest under klar sommardag)
TACK FÖR OSS!

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Zehra - Inomhusvärme.pptx