next generation of software tools wall wizard : dryvit · •new class of wall selection wizard...
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Next Generation of Software Tools
Wall Wizard : DRYVIT
Achilles Karagiozis – Tony Stall – Peter Culyer-Roland Serino
Dryvit Systems IncOak Ridge National Laboratory
2
Presentation Layout
• Development Need
• Approach - Challenges
• Imbedded Needs
• Functionalities
• Conclusions
3
DEVELOPMENT NEED
Softwareneeded tobe simple
It had be toPracticalto solve real problems
It had to Includea Dumb proofapproachto avoidmiscreations
4
TECHNOLOGY
• Powerful Hygrothermal tools have appeared
• Engineers & Architect lack training in BuildingScience (This translates in $$$$$$$ for all of u)
• Adoption cycles for new technology is very veryslow for building industry (5 to 20 years)
• A hygrothermal stick for comparison was non-existent
• MOISTURE ENGINEERING has MATURED (Ready)
Dr. Miller
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Approach: MOISTURE ENGINEERING
Inputs:
PHYSICS
MATERIALPROPERTIES
BOUNDARYCONDITIONS
NUMERICS
BUILDING SYSTEMSUB-SYSTEMExterior
Loads
Interior Loads
MOISTURE-EXPERT
3-DThermalDrainage/Tests
6
Constraints: Make Complex ProcessS I M P L E
• At least 2-Dimensional Transient MODEL• Heat transport, vapor transport, liquid transport, air
transport• Capture natural convection, wind-driven rain, • Evaporation/condensation and freeze/thaw latent
transport,• Air Ventilation cavities, Drainage, Radiative exchange• Full functional dependencies of material properties• Hystersis or temperature dependencies• Solar radiation, night-time radiation exchange and
cloud interference.
Challenge: Never Done Before
7
APPLICATION : WALL WIZARD
• EIFS Moisture Engineered Wall Systems
• Multiple assessment criteria− Three assessment elements
• Exterior/Interior Load Assessment• Energy Consumption Comparitor• Wall Wizard Selector
•Professional Report Document
8
Inputs
MATERIAL LEVEL INPUTS
All hygrothermal material properties measured
• WVP (at two temperatures)
• Liquid Diffusivity (at two temperatures)
• Sorption & Suction Isotherms
• Thermal Conductivity measurements
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BRICK SORPTION ISOTHERM
Red Brick23°C; Dried at 105°C
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0 10 20 30 40 50 60 70 80 90 100
Relative Humidity, %
Moi
stur
e C
onte
nt, %
Sorption
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0.00
0.01
0.02
0.03
A B C D E F G H I
A, k
g/m
2 s0.5 T40 1-4
T23 1-4T40 7-10T23 7-10
LIQUID UPTAKE RESULTS
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HOT BOX RESULTSSteady-State R-ValueInterior Side Temp = 100°F; Exterior Side Temp = 50°F
12.0
12.5
13.0
13.5
14.0
90 100 110 120 130 140 150 160
Time
R-V
alue
(h•ft
²•°F/
Btu
)
R(wall) 4-HR. Avg. R 24-HR. Avg. R R(avg) R(avg)+1% R(avg)-1%
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NEXT STEP Numerous Architectural Components
Wall/Roof Intersection
Wall/Door Intersections
Wall/Window Intersections
Corner Intersections
Wall/Foundation Wall Intersection
Wall/Slab Intersection
Wall/Internal Partition IntersectionClear Wall
Wall/Floor Intersections
15
3-D Thermal Analysis (Kosny)
WALL SYSTEM R-VALUES
0
2
4
6
8
10
12
14
16
clear wallcornerroof/wallfound/wallwind/sidewind/headwind/silldoor/sidedoor/headwhole wall
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3-D air flow & Drainage analysisBuilding Envelope System and Sub-systems
Quantify•• airflowairflow through walls•• drainagedrainage and retentionretention•• dryingdrying of drain space•• dryingdrying of stud space
(Dr. Straube& Karagiozis)
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