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Two story home powered by solar energy
Location: Tulsa, Oklahoma
Team members: Andrew Blair, Karen Smith, Phil Eaton, Scott Melchionno, Tim
Williams
Preliminary Design Review
Floor Plan Layout
R· I· T Mechanical Engineering Department
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Floor Plan Layout
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Floor Plan Layout
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House Elevation Drawing
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Foundation Analysis
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o Functions of Foundationo Support Load of Houseo Resist Load of Soilo Resist Moisture Intrusiono Cost Efficient
oMaterial Costo Labor Cost
o Resist Change in Temperatureo Built to Building Code
Foundation Analysis
R· I· T Mechanical Engineering Department
o Material Choiceso Poured Cement
oBetter InsulationoMore Water Resistant
o Cement BlocksoCheaper cost (material/labor)o Same Strength (filled)
o Rebar Reinforcemento .0127 meter bar o Placed every .6096 meters
http://www.matweb.com Mark’s Standard Handbook for Mechanical Engineers
Foundation Analysis
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o Analysiso Thickness: .2921 mo Rebar: .0127 m spaced every .6096 mo Force due to soil: 463.85 kNo Stress due to House: 4.26 MPao Compressive Strength (Portland concrete): 27.6
MPao Shear Strength (Portland concrete): 5.52 MPao Bending Stress: 5.20 MPao Factors of Safety: Compression 6.5 Bending 5.1o Footers: Depth .4572m Width .4572m
Thick .2032mhttp://www.archive.org/stream/gov.ok.building/ok_building#page/n433/mode/2up
http://climate.mesonet.org/county_climate/Products/oklahoma_climate_overview.pdf
Truss Analysis
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o Functions of Roof Trusso Support Roofing Materialso Support Flat Plate Collectoro Resist Wind and Snow Loadso Cost Efficient
oMaterial Costo Labor Cost
o Tornado Resistanto Factor of Safety
o Built to Building Code
Truss Analysis
R· I· T Mechanical Engineering Department
o Analysiso Typical residential roof design- 4.37 kN/m2
o ASCE 7-02 Snow Load Standardo Snow Load=1.62 kN/m2
o Flat Plate Collectoro 1.70 kN/m2
o Total Roof Load- 6.00 kN/m2
o Each truss supports ~ 21.8 kN
Truss Analysis
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o Option Analysiso Fink Truss
o Most efficient use of material for trusso Howe Truss
o More material used, but lower member forceso Truss Spacing
o 1.75m (48”) Standardo Roof Angle
o 30 ° – Less efficient, but standard- can buy manufactured trusses- cheaper.
o 37° – ~10% more efficient, but built on site.- expensiveo Material
o Douglas Fir- Strong, expensiveo Hemlock- Weaker, but less expensive
Truss Analysis
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Truss Analysis
R· I· T Mechanical Engineering Department
Truss Analysis
R· I· T Mechanical Engineering Department
o Truss Summaryo Fink Truss
o Most efficient use of material for truss, sufficiently low member forces
o 30 ° Roof Angleo Can buy cheaper pre-manufactured trusseso Easier Installation
o Douglas Fir- Rough Cuto Higher strength to cost ratioo Benefit in “Tornado Alley”
o Cost (Minus Labor costs)o Pre-manufactured- ~ $1000-1200 ( Michiana
Building)o Custom- ~ $1170-1350 (Est. local cost- Lowes)
o Assumptions Madeo Wall design
o Siding choiceo Insulation choices
o Heat Loss Calculationso Cost Analysis
Thermal Envelope
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o Assumptions Madeo Heat convection on the inside of the house is
negligible to the rest of the thermal systemo Cold roof o Studs are 15% and Insulation is 85% of wallo Turbulent flow for outside airo All windows are the same size
Thermal Envelope
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o Wall Designo Siding Choices
oBrickoVinyloWood Shingles
o Insulation ChoicesoGlass Fiber BlanketoU value = .402 W/m2K
o Loose Fill Glass FiberoU value = .4275 W/m2K
o Polystrene R-12oU value = .3255 W/mK
Thermal Envelope
R· I· T Mechanical Engineering Department
Not Drawn To Scale
GypsumInsulatio
nPlywood
Brick
Stud
o Heat Loss Calculationso Glass Fiber Blanket
oQ = 1914.07 W
o Polystrene R-12oQ = 1675.5 W
o Loose Fill Glass FiberoQ = 1993.6 W
o Cost o Glass Fiber Blankets = $3179.50o Polystrene R-12 = $3668.77o Loose Fill Glass Fiber = $2364.55
Thermal Envelope
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FPC Specs
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FPC Type - SunMaxx-M2
Cost - $800.00 each
Dry Weight - 85 lbs (38.5 kg)
Absorber Area – 21.5 ft2 – (~2 m2)
Nominal Flow Rate – .08 m3/hr (21 gph)
FPC System Design for Hot Water Use
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• Tilt angle – 37 degrees (optimal sun exposure)
• F Chart Results – 2,017 kWh/yr/m2 Potential energy generation
• 3 panels would sufficiently supply hot water to residence at nearly 100% of time
• Hot water usage was converted to an energy consumption equivalent – 7,022 kWh/yr
FPC System Design for Hot Water and Radiant Heating
R· I· T Mechanical Engineering Department
• Q Value of home becomes a factor
• Heat Loss estimates used to approximate how much energy radiant heating system must supply
• System must develop between 14,500 - 17,500 kWh/yr of additional energy to make up for lost heat based on insulation material
c
System Viability
R· I· T Mechanical Engineering Department
• The design of the house delivers Q values in the range of 1675.5 to 1993.6 watts.
• To generate the necessary energy to make up for this loss the system would require 8 panels.
• At a net cost of approximately $6400 + installation, delivery, and hardware the complete system cost will be far below the $36,000 allowable for the system.
Flat Plate Pre-Packaged System: 50 Gallon
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Hydronic System Schematic
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Fluid Systems
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The entire system (FPCs included) is a COTS system produced by Silicon Solar, Inc.Because it is a COTS system, the separate components are specifically chosen by manufacturer to provide the highest efficiency and lowest cost.The entire system can be purchased for just under $3000, including freight and crating fee.Warranty: 3 year tank, 1 year pump and controller, 1 year on balance of system components, 3 year on flat plate.The system is designed to produce at least 80 gallons of potable hot water per day.
Fluid Systems
R· I· T Mechanical Engineering Department
The DHW system is controlled by a computer which automatically regulates the temperature of the water in the storage tank.
If the temperature falls below a set minimum, the computer will switch on the pump to circulate the working fluid through the FPCs and heat exchanger to raise the temperature of the water in the storage tank.
