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Samenvatting Thermisch comfort Deel 2

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Een vervolg op het eerste deel van de samenvatting van het vak Thermisch comfort, gegeven door Marcelo Blasco.

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August 25, 2025
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3.Grootheden warmtetransmissie– Warmtedoorgangscoëfficiënt

WARMTETRANSMISSIE
- Geleiding: thermische conductiviteit (Lambda) W/mK
- Convectie: natuurlijke / gedwongen
- Straling: EMS – emissiviteit ε (maat voor hoeveelheid warmte door opp kan
afgestraald worden
- Stationair regime

- Combinatie van de 3
- Warmteverliezen: U doorheen de constructies
- Suppelementaire randeffecten (profielen venster)

Convectie luchttransport
Straling – uitzenden warmte van lichamen vd ruimte
Warmtedoorgangscoefficient: houdt rekening met drie vormen van warmtetransport

Roze muur:
- Weerstand aan binnekant = schijnbare
warmteweerstand binnen = Rsi
- Warmteweerstand door de geleiding =
Weerstand door de muur = Rg
- Schijnbare warmteweerstand buiten =
Rse
- Weerstand door de muur = Rg
- Elektrisch analagon
- Equivalent door elektrisch circuit
- T1 en T2
- Weerstanden in elektrisch ciruit (Volt)
totale weerstand in dat ciruit = de
optelling
- Rsi + Rg + Rse

Zwarte muur:
- Totale warmteflux = qt
- Qt = 1/ Rtot x (Ti – Te) = U x (Ti – Te)
- Warmtedoorgangscoefficient
- Bereken de U waarde ve wand =
uitrekenen Rtot
- Rtot = Rsi + Rg + Rse
- Rse en R: vinden in een tabel –
getabeleerde waarden

,ELEKTRISCH ANALAGON 2




- Rtot = totale thermische weerstand = Rg + Rc + Rr
- Ti = binnentemp
- Te = buitentemp
- U = warmtedoorgangscoëfficiënt W/mK
- qtot = totale warmteflux W/m²


WARMTETRANSMISSIE
- 1D
- Fluxlijnen loodrecht – vlakke wanden beschouwen
- Hoeveel energie (warmte) per m², per sec, per graad temperatuurverschil
doorheen een constructief element gaat
- W/m² K


WARMTEDOORGANGSCOËFFICIËNT U
- Warmteverlies tonen
- Hoe kleiner de U waarde hoe beter, meer thermisch isolerend
- Tussen 0 en 1,5 (max 2) W/m²K




OVERGANGSWEERSTANDEN Rs
- Aan opp van de wand

, Rt BUITENWANDEN




Rt BINNENWANDEN




OVERGANGSWEERSTANDEN Rs




- Pijltje vertelt de richting van de warmteflux = de grote pijl
- Plat dak – van links naar rechts - boven nr beneden
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