Henk Schellen 2003 Vertigo 06H29 Tel 2651

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Presentation transcript:

Henk Schellen 2003 Vertigo 06H29 Tel 2651 College Lucht en Vocht Henk Schellen 2003 Vertigo 06H29 Tel 2651

Vochttransportmechanismen Aggregatietoestand Mechanisme Drijvende kracht Waterdamp Diffusie Verschil in partiële dampdruk Convectie Verschil in totale luchtdruk Water Capillariteit Verschillen in capillaire zuiging Zwaartekracht De massa Druk Verschillen in totale uitwendige druk

Vochttransportmechanismen Aggregatietoestand Mechanisme Drijvende kracht Waterdamp Diffusie Verschil in partiële dampdruk Convectie Verschil in totale luchtdruk Water Capillariteit Verschillen in capillaire zuiging Zwaartekracht De massa Druk Verschillen in totale uitwendige druk

Poreuze materialen en vochttransport Damptransport door diffusie Waterdampgeleidingscoëfficiënt Dampdiffusieweerstand Glaser-methode Dampremmende lagen

Lage weerstand tegen diffusie Poreuze materialen Poriënstructuur van UF-schuim Hoge porositeit Lage weerstand tegen diffusie

Poreuze materialen en vochttransport

Maximale dampspanning Psat() Relatieve vochtigheid Ter herinnering Dampspanning PD Maximale dampspanning Psat() Relatieve vochtigheid

Dampspanning [Pa]

RV=50 % Psat(20)=2340 Pa Pv=0,5*Psat(20)=1170 Pa

RV=50 % Psat(20)=2340 Pa Pv=0,5*Psat(20)=1170 Pa dew=9,3 oC

Maandgemiddelden De Bilt (KNMI)

Waterdampgehalte buiten

Analogie warmte- en vochttransport  dx x

Analogie warmte- en vochttransport ,Pv dx x

Waterdampdiffusie in materiaal  = dampdiffusieweerstandsgetal [-]

Waterdampdiffusie in materiaal gv pv1 pv2 Z

Waterdampdiffusie in materiaal gv pv1 pv2 Z

Serie-schakeling z1 z2 z3 z3 pe pi Ztot=z1+z2+z3+z4 = ((d)1 + (d)2 + (d)3 + (d)4)/a

Temperatuurverloop in constructie 1 Rci 2 Rl j n-1 n i

Temperatuur- en dampspanningsverloop in constructie 1 di 2 dtot Pj n-1 n pi

Methode Glaser

Methode Glaser

Materiaalgegevens Min. wol baksteen pleister beton spouw d - 0,08 0,06 0,04 0,1 0,01  100 1,5 15 30 d  2 1 R 0,13

Materiaalgegevens Min. wol baksteen pleister beton spouw d - 0,08 0,06 0,04 0,1 0,01  100 1,5 15 30 d 8 0,3  2 1 R 0,17 0,13

d - 0,08 0,06 0,04 0,1 0,01  100 1,5 15 30 d 8 0,3  2 1 R 0,17 0,13 pv 520 1170  20 psat 2340

d - 0,08 0,06 0,04 0,1 0,01  100 1,5 15 30 d 8 0,3  2 1 R 0,17 0,13 pv 520 1170  0,4 0,8 15,0 17,6 18,6 18,7 20 psat 2340

20 18,7 17,6 15,9 10 -lijn 0,8 0,4  (oC) 0,1 0,5 8 1,5 d

20 2500 18,7 17,6 15,9 10 2158 2000 -lijn 0,8 0,4 1500 Pi=1170 1000 P*-lijn 648 Pe=520  (oC) 500 Pv(Pa) 0,1 0,5 8 1,5 d

d - 0,08 0,06 0,04 0,1 0,01  100 1,5 15 30 d 8 0,3  2 1 R 0,17 0,13 pv 520 1170  0,4 0,8 15,0 17,6 18,6 18,7 20 psat 630 648 1808 2014 2144 2158 2340

-lijn P*-lijn Psat-lijn 20 10 2158 2000 1500 Pi=1170 1000 648 Pe=520 18,7 17,6 15,9 10 2158 2000 -lijn 1500 0,8 0,4 Pi=1170 1000 P*-lijn Psat-lijn 648 Pe=520  (oC) 500 Pv(Pa) 0,1 0,5 8 1,5 d

-lijn P*-lijn Psat-lijn 20 10 2158 2000 1500 Pi=1170 1000 648 Pe=520 18,7 17,6 15,9 10 2158 2000 -lijn 1500 0,8 0,4 Pi=1170 1000 P*-lijn Psat-lijn 648 Pe=520  (oC) 500 Pv(Pa) 0,1 0,5 8 1,5 d

psat pe pi Ze Zi

Methode Glaser psat pe pi Ze Zi

Methode Glaser psat pe pi Ze Zi

Methode Glaser psat pe pi Ze Zi

Methode Glaser psat pe pi Ze Zi gv = 468*10-10 kg/m2s = 0,17 g/m2h

Dampremming binnen of buiten? Intern I = 20 oC i=100 % Ri=0,13 m2K/W Stel 80 mm isolatie Rc = 0,08/0.04=2 Rl = 2,17 Extern e = -10 oC e =100 % Re=0,04 m2K/W

Dampremming binnen of buiten? = 0,55 laag = 0,25*2*30/2,17 = 6,9  -10 20  0,55 6,9 Ps 260 270 500 850 1350 2100 2340

Dampremming binnen of buiten? = 0,55 laag = 0,25*2*30/2,17 = 6,9  -10 -9,5 -2,6 4,4 11,3 18,2 20  0,55 6,9 Ps 260 270 500 850 1350 2100 2340

Dampremming binnen of buiten? 2100 2100 extern intern extern intern 270 270 Dampremming buiten Dampremming binnen

Dampremming binnen of buiten? 2100 2100 1350 1350 extern intern extern intern 1170 1170 850 850 500 500 270 270 Dampremming buiten Dampremming binnen

Dampremming binnen of buiten? 2100 2100 1350 1350 extern intern extern intern 1170 1170 850 850 500 500 260 260 Dampremming buiten Dampremming binnen

Oppervlaktespanning

Capillair transport

Poreuze materialen en hygroscopisch vocht Moleculaire adsorptie: Adhesie moleculen waterdamp en vaste materie Geadsorbeerd water in porie

Hygroscopisch vochtgehalte