preliminary design review group members position brittany borella solar thermal nicole varble...

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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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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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