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EPA Solar Oven Project #05301. Critical Design Review May 13, 2005. Team Solar Oven. Agenda. Project Mission Statement Needs Assessment and Requirements Materials Selection Testing Methodology Types of Solar Ovens Concept Development/Selection Three Generations and Their Performances

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EPA Solar Oven Project #05301

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EPA Solar Oven Project #05301

Critical Design Review

May 13, 2005


Team Solar Oven


Agenda

  • Project Mission Statement

  • Needs Assessment and Requirements

  • Materials Selection

  • Testing Methodology

  • Types of Solar Ovens

  • Concept Development/Selection

  • Three Generations and Their Performances

  • Environmental Assessment

  • Questions


Project Mission Statement

  • Design, test, and build a low-cost solar oven for use in Latin American countries using locally available resources, mass production methods, and labor


Needs Assessment: Scope Limitations

  • Design must be ultra low cost

  • Design should only incorporate locally available resources, production methods, and labor

  • Design should be mass-producible

  • Design must be durable

  • Design must be able to cook food and pasteurize water

  • Design must be benchmarked against three commercially available units

  • Thermal analysis must be conducted on prototypes


Ranking of Attributes


House of Quality- Part 1


Materials Selection*

  • Main Construction Material

  • Reflector Material

  • Cover Material

    * CES Selector 4.5


Main Construction Material


Main Construction Material


Wood Selection


Reflector and Cover Material

  • Offset printing plates chosen for reflector

    • Cost

    • Reuse of waste material

  • Acrylic chosen for cover material

    • Durability


Testing Methodology

  • Determine angle of reflectors

    • Square One software

    • Laser Testing

  • Mimic sun’s energy

    • Create indoor setup

    • Calibrated solar cell

  • Test prototypes outside

    • Thermocouples


Three Main Types of Solar Ovens

Box

Panel

Parabolic


Concept Development

Homemade ~$10

Commercial: $120-$220


$33.64 (Materials)

Generation I: Four Reflector Box


$15.38 (Materials)

Generation I: Single Reflector Box


$19.65 (Materials)

Generation I: Pyramid Reflector Box


Generation I Performance


Generation II-A

  • Trip to Venezuela

    • Fabricated 2 units

      • Single-paned acrylic

      • Double-paned acrylic

    • Tested outdoors

  • Performance

    • Reached water pasteurization temperatures 65C (149F)


Expert Input

  • Dr. Nandwani

    • International Expert on Solar Cooking

  • Materials and Designs

    • Utilize glass not acrylic

    • Suggested suitable insulation materials

    • Optimal thicknesses

  • Generation II-B

    • Retrofitted Generation II-A unit


Generation II-B Performance


Generation III

  • Thermal analysis

    • Optimal insulation thickness

  • Increased capacity for larger families

  • Cost: $32.33


Generation III Performance


How did we do?

  • One fourth the price of the cheapest commercial unit: $29.33 (materials + labor) vs. $121.94

  • Full price, $32.33, includes a WAPI ($3)

    • A device to tell if water has been pasteurized

  • Reaches cooking and water pasteurization temperatures

  • Uses 36% reuse materials


HOQ- How Did We Do?


Recommended Future Work

  • Slant oven so more direct sunlight hits pot(s)

  • Research optimal number of glass panes

  • Explore sealants for weatherproofing

  • Replace the main construction material, MDF, with a less dense material with similar or better thermal properties to reduce weight


SOS Solar Cooker vs. RIT Solar Cooker Life Cycle Impact(Characterization)


SOS Solar Cooker vs. Generation III

81%

84%

67%


Benefits of Solar Ovens

If 1,000 solar ovens are used year-round by families of six, this would save approximately…

  • FIREWOOD 17,000 Tons

  • CO2 6,300 Tons

  • CO 300 Tons

  • FUEL 9 Million Lbs


Thanks to:

Dr. Carrano

Dr. Thorn

Dr. Mozrall

Mr. Wellin

Dr. Raffaelle

Dr. Nandwani

Carlos Plaz

Chris Wood

Questions?

Thanks and Questions


Backup Materials

  • Feasibility Assessment

  • Indoor Test Cell


Feasibility Assessment:How Many Prototypes to Build


Feasibility Assessment:How Many Prototypes to Build


Indoor Test Cell


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