Heat and Moisture Modeling Using COMSOL dr.ir.ing. Jos van Schijndel Presented at the COMSOL Conference 2008 Hannover
Heat and Moisture Modeling Using COMSOL
dr.ir.ing. Jos van Schijndel
Presented at the COMSOL Conference 2008 Hannover
PAGE 111-11-2008
Multiphysics Contents
• Introduction • Heat and Moisture Transport• Verification • Application• Conclusions
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WHAT? Multiscale couplingtime, geometry
Whole Building (scale 10 m)Detail (scale 0.01 m)
ConstructionLocal
Systems & ControlLocal
Coupled
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WHAT? Multiphysics couplingheat, air, moisture, …
heat
air
moisture
0)( =∇⋅+∇−⋅∇+∂∂ TCTtTC pp uρλρ
0)( =∇⋅+∇−⋅∇+∂∂
vvv ppDtp u
[Tariku 2008]
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WHY?
GoalImprove building and systems performances
durability, comfort, economics
ScienceModeling is an essential and inseparable part of all
scientific activity [wikipedia]
Design Application of Knowledge to Control
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HOW? Modeling based on physicsOptimal Abstraction level
Multi Buildings(HAMBase)
Multi PDEMulti
ODE
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HOW? ImplementationMatLab/SimuLink/COMSOL
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Multiphysics 3D Heat
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Multiphysics 2D heat & air & vapour
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Multiphysics 2D wind & driving rain
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Multiphysics 2D wind & driving rain
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3D thermal2D heat & air & vapour
MultiphysicsEducation
• Master Course, 2 ECTS• Exemplary results• Course Available at http://sts.bwk.tue.nl/7s532/
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Multiphysics Modeling Validated
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Guidelines FEM Heat and Moisture Modeling (1) Use LPc as potential
)(
)(
2221
1211
LPcKTKtLPcC
LPcKTKtTC
LPc
T
∇+∇⋅∇=∂
∂
∇+∇⋅∇=∂∂
,
,
,
)log(
21
22
12
11
10
TPsatK
RTM
PsatLPcPc
LPcPcKK
LPcPc
PcwC
RTM
PsatLPcPclK
KcCPcLPc
p
a
wp
LPc
a
wplv
T
∂∂⋅⋅=
⋅⋅∂∂
⋅⋅−∂∂
⋅−=
∂∂
⋅∂∂
=
⋅⋅∂∂
⋅⋅⋅−=
=⋅=
=
φδ
ρφδ
ρφδ
λρ
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Material Function in MatLab(2) Calculate PDE coeffients fun(Lpc,T)
)(
)(
2221
1211
LPcKTKtLPcC
LPcKTKtTC
LPc
T
∇+∇⋅∇=∂
∂
∇+∇⋅∇=∂∂
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Material Function in MatLab(2) Calculate PDE coefficients fun(LPc,T)
)(
)(
2221
1211
LPcKTKtLPcC
LPcKTKtTC
LPc
T
∇+∇⋅∇=∂
∂
∇+∇⋅∇=∂∂
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VerificationHAMSTAD Benchmark no 1
)()()(
ppgpplTThq
i
ilvii
−⋅=−⋅⋅+−⋅=
ββ
0)(
=−⋅=
gTThq ee
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VerificationHeat & Moisture
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VerificationHeat
COMSOL Reference
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VerificationMoisture
COMSOL Reference
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Step 1Measurements, sensors
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Step 2: Modeling & ValidationSimulation vs Measurements
Ti RHi
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Step 3: Application of the model
• Evaluation of the moisture damageMoisture damage not caused by moisture through the constructionMoisture damage not caused by condensation at the insideConfirmation of leakages
• Evaluation of a new design:Effect of partly removing the concrete
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ConclusionMulti(building)physics & COMSOL
• COMSOL is a state-of-art Multiphysics modeling tool for doing research in the area of building physics
• High performance on• 1,2 & 3D capabilities• Grid & solvers techniques• Visualisation• Flexibility due to PDE abstraction level
• Also a excellent tool for education • Our models are available at http://sts.bwk.tue.nl/hamlab/
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• Thank you
• Questions ?