preliminary design review group members position brittany borella solar thermal nicole varble...
TRANSCRIPT
Preliminary Design Review
Group Members Position
Brittany Borella Solar ThermalNicole Varble Hydronic SystemEric Walkama FoundationsJay Wheaton Structural/Building ThermalTed Zachwieja Architectural/Building Thermal
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Group #16Austin, Texas
Agenda
Black band lives here!
1. Introduction2. Architectural Floor plan
a. House Elevation Drawingsb. Floor Plan Drawings
3. Foundation Designa. Preliminary Analysisb. Block vs. Poured
4. Roof Truss Designa. Truss Shapesb. FPC positionsc. Material Selectiond. Preliminary analysis
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5. Hydronic Systema. Design Inputsb. Head Lossc. Pump Choices
6. Solar Thermal Systema. Life cycle cost vs. Solar
Fraction Analysisb. Flat Plate Collector
Choices7. Building Thermal System
a. Wall, Roof, and Ceiling Thermal resistivity's
b. Material Properties
Location: Austin, Texas
Climate Temperate-to-hot green oasis Highly variable – characteristics of dessert, tropics, and
wetter climate Winters
Mild and dry Average 88 days below 45F (7C) Average 24 days below freezing
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ArchitecturalExterior Layout
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ArchitecturalExterior Layout
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ArchitecturalBasement
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ArchitecturalFloor 1
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ArchitecturalFloor 2
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Fsoil
Rf
Rc
h
h/3
Figure: FBD of soil pressure on basement wall
Figure: Bending Moment Diagram
M(y)
M max
Variable Value
ρ, density (dry)
.0637 lb/in^2
w, length wall 44 ft
h, height 8-10 ft
t, thickness 6-10in
I 9504-44000 in^4
Fsoil 155000-242161 lb
Rc 51666 – 80720 lb
Rf 103333 -161440 lb
M max 3306624 –6457600 lb-in
σ (dry) 1043-2083 psiAU
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System
Poured Block
Pro •Faster Installation•Stronger Walls•More Waterproof•More flexible in design
•Properly filled walls can give good insulation•Wire and rebar can be placed in between and in blocks to give tensile strength•Can be installed by homeowner
Con •Cannot be done by homeowner
•Longer installation•More prone to leaks•Less flexible in design
Approx.InstallationCost
$5000 + $0(for self installation) or several thousand for laborA
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FoundationPoured vs. Concrete Block Foundation
Weight of House
Floor Reaction
Figure: FBD of Compressive Loading on Foundation
Variable Value
w, width wall 25 ft
L, length wall 44 ft
t, wall thickness 6-10 in
A, wall area 9792 – 16160 in^2
House Dead Weight
>60 psf
Dynamic Loading >100 psf
Approx. Total Weight
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XFoundationCompressive Loading
Material Compressive Strength Cost
Portland Cement
8400 psi $75/yd^3
Concrete Block 8400 psi $1.60/block
Rebar Material
Tensile Strength
Grade 40 >40,000 psi
Grade 60 >60,000 psi
Grade 75 >75,000 psi
footing
Figure: Sample Cross Section of Foundation wall
(Cement only has a tensile strength of 132 psi so rebar is needed to resist soil load)
Ceiling height, h
grade
6 in
rebar
Rebar spacing is 12”-24” for horizontal and vertical (1/2” diameter)AU
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XFoundation
Materials
Insulation Drainage
Interior Wall Damp Proofing
Exterior Wall Waterproofing spray or layer
Middle Wall (insulating concrete form)
Piping System (trench drain, use slope)
ASTM C 578 polystyrene foam
• Other support in basement to hold concentrated loadings in house and to take some loadings off of walls
• Soil compaction/preparation
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Other Foundation Considerations
StructuralTruss Design
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StructuralFPC Position
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StructuralDimensions
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StructuralMaterials
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Owens Corning Pacific Wave Duration Premium AR Designer Series Shingle
Owens Corning Sand Dune Duration Premium AR Designer Series Shingle
StructuralMaterials
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Material Cost Density Vendor Description
2"x4"x10' $3.64/ea.18.33 lbf/52.5
cubic ft.Home Depot
Kiln Dried Dimensional Lumber
Shingles 28.70/Bundle 225lbf / 100 sq. ft. LowesOwens Corning Duration
Premium-Limited Lifetime Waranty
Sheathing $14.47/32 sq. ft. 68lbf / 32 sq. ft. Home Depot
Trubord 19/32" OSB Sheathing
Connector Plate
$0.50/ea. 0.1 lb/plateHome Depot
5”x 1.8” TP-15R Tie Plate
Underlayment $120/1000 sq. ft. 28lbf/1000 sq. ft. Lowes Grace TRI-FLEX underlayment
StructuralWeight Analysis
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Material Density Amount in Roof Weight (lbf)
Lumber 18.33 lbf/.365 cubic ft. 34*3.11 cubic ft 5310.18
Shingles 225lbf / 100 sq. ft. 1406.2 sq. ft. 3164.0
Underlayment 28lbf / 1000 sq. ft. 2812.32 sq. ft. 78.8
Sheathing 68lbf / 32 sq. ft. 1406.2 sq. ft. 2988.2
FPC’s 7 lbf / sq. ft. 4*30 sq. ft. 840.0
Misc. 0.3 lbf / sq. ft. 1406.2 sq. ft. 421.9
Total -- -- 12,803.1
Total per FPC Side (1) -- -- 9.7 lbf/ft^2
Total per non-FPC Side (2) -- -- 8.5 lbf/ft^2
StructuralTruss Stress Analysis
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StructuralTruss Stress Analysis
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RAy REy
x
y
d1
d2
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StructuralTruss Stress Analysis
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Plugging in values:RAy = 194.4 lbfREy = 176.5 lbf
Hydronic SystemDesign Inputs
Structural [ft]Height of Basement 9Height of 1st floor 9Height of 2nd floor 9Width of Roof 15Roof Height 8FPC# of FPC 3Flow Rate [gpm] 3.97∆P [in H2O] 175.6
Cumulative Head[ft]
0.01445.75373.24073.42096.05696.48588.65162.08463.08463.20764.221
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Hydronic SystemHead Loss
Head Loss Factors• Pipe Diameter• Pipe Length• Number of Elbows• Elevation Changes• Valves• Flat Plate Collectors
pump
FPC
HX
Elevation Change
Elbow
Valve
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Hydronic SystemPump Choices
Part # Head Diameter @ 50 ft @ 100 ft @ 150 ft Costft in gpm
8134k24 129 1 19 10 - $814.508134k28 264 1 - 19 15 $931.03
*not self priming, rated for continuous use, temp range from 5-194F, use to transfer liquid to considerable heights
Part # Head Diameter @ 40 ft @ 80 ft Costft in gpm
4011k11 1032 -> 1.5 50 31 $340.854011k22 1152 -> 1.5 63 44 $370.52
*used typically in sprinkler systems, used to overcome high head loss, self-prime up to 25 ft
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Hydronic SystemPump Choices continued
* multi stage impeller, typically used for coolant delivery, mounted vertically
* to use in parallel with several of the same pump, compact, ideal for heating applications
Part # Head Diameter @ 0 ft @ 100 ft Costft in gpm
99825k51 150 1 38 25 $838.37
Part # Head Diameter @ 5 ft @ 20 ft Costft in gpm
67705k4 33 0.5 29 17 $8.28/pari
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Solar Thermal System
As an Alternative to Natural Gas
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As an Alternative to Fuel Oil
Solar Thermal System
As an Alternative to Electricity
Maximization of Life Cycle Savings vs. the
Solar Fraction occurs at around 4 panels in each
chart
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Solar Thermal System
Leftover heat after the heat exchange with the domestic water can be used
for radiant heat.
Does not make sense to install a separate space
heat system. Only below 60°F 3 months a
year
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Solar Thermal System
Panel Options
Sol 25 Plus by Stiebel Eltron
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Solar Thermal System
Panel Options
Caleffi SKN 4.0 NAS10406 Flat Plate Solar Collector
Other Standard Features : • Fibreglass framework • Low iron tempered glass. • Copper header tube. • Copper fintube absorber. • R-10 poly-isocyanurate foam board. • Rapid connection system. • Flat and sloped roofs or freestanding. • Vertical or horizontal installation. • Compatible with any DHW heating system. • Connect up to 12 collectors in series. • Commercial or residential systems. • 74.3% Optical efficiency. • 4.036 Heat Loss coefficient.
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Building Thermal EnvelopeWalls
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Cellulose Insulation:Pros
• mixed with chemicals to reduce its flammability (can create a 2 hour Firewall)• Blown cellulose averages same R-Value as Fiberglass but can be 2-3 inches
thinner• mold easier around studs• better against air infiltration
Cons• 72 hours to a year to dry completely• installation requires special equipment• mixed with chemicals insulation can corrode metal
Building Thermal EnvelopWalls
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Fiberglass Insulation:Pros
• ages well• extremely difficult to ignite• Doesn't require special equipment for installation
Cons• once ignited can release toxic fumes and burns very hot• installation requires protective equipment
Building Thermal EnvelopWalls
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Material R-Value between Studs R-Value at Studs
Inside Film Coeffcient 0.68 0.68
Gypsum Board 0.08 0.08
Insulation 19.00 0.00
Studs 0.00 0.77
Plywood 1.08 1.08
Vinyl Siding 0.62 0.62
Outside film Coefficient 0.17-0.25 0.17-0.25
Cellulose R19 About $0.60 per ft^2Fiberglass R19 About $0.48 per ft^2
Building Thermal EnvelopRoof/Outside
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ComponentR-Value (h•ft2•°F/Btu)
Between Truss At Truss
Outside Film (15mph) 0.17-0.25 0.17-0.25
Asphalt Shingles 0.44 0.442 layers of Felt 0.002 0.002
19/32" OSB Sheathing 0.77 0.77
2x4 Pine Stud -- 0.36 Cellulose Insulation 1.01 --
Fiberglass-Batt. insulation 0.97 --Inside Film (45° Slope, Heat Downward) 0.76 0.76
Total R (cellulose) 3.15-3.23 2.50-2.58Total U (cellulose) 0.32-0.31 0.40-0.39Total R (fiberglass) 3.11-3.19 2.50-2.58Total U (fiberglass) 0.32-0.31 0.40-0.39
Building Thermal EnvelopCeiling/Attic
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Between Truss At Truss
Interior Film (horizontal, still, heat upward) 0.61 0.61Gypsum Board (1/2”) 0.04 0.04
2x6 Pine Stud -- 0.56
Cellulose Insulation 1.58 --
Fiberglass-Batt. Insulation 1.53 --
Attic Film (horizontal, still, heat downward) 0.92 0.92Total R (cellulose) 3.15 2.13Total U (cellulose) 0.32 0.47Total R (fiberglass) 3.10 2.13Total U (fiberglass) 0.32 0.47
ReferencesA
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• 2009 ASHRAE Handbook - Fundamentals (I-P Edition) Ch. 26• 2009 International Building Code• Lowes.com• Homedepot.com• http://www.maplevalleytruss.com/config.htm