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The Hawkeye Solar Cooker

Phase II and III Detailed Design and Build. The Hawkeye Solar Cooker. Design with mobile storage unit. Wall. Compound parabola. Second reflector. Chamber with reflecting interior. Cook Surface. Opening For Storage Unit Entry. Mobile Storage Unit ( sand+oil+metal ). Night-time

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The Hawkeye Solar Cooker

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  1. Phase II and III Detailed Design and Build The Hawkeye Solar Cooker

  2. Design with mobile storage unit Wall Compound parabola Second reflector Chamber with reflecting interior Cook Surface Opening For Storage Unit Entry Mobile Storage Unit (sand+oil+metal) Night-time position of storage Unit Stand for Reflector assembly Rail

  3. Cook surface Morning cooking High Cp, low k (sand) More insulation Evening cooking High Cp, high k (metal+sand)

  4. Items to quantify and model Collector All dimensions into the plane are W subscripted with C,NC,MC Night cooking (7 PM) Morning cooking (7 AM)

  5. Cautionary Issue: Estimate of heat loss from each storage box Assume : Night cooking storage time is approximately 5 hours (3 PM to 8 PM) Potential loss from night cooking storage = 1.75 KWh ! Need to bring heat loss rate down to 100 W! Morning cooking storage time is approximately 16 hours (3PM to 7 AM) Potential loss from morning cooking storage = 5.5 KWh!

  6. Recalculate using asymmetry of storage Assume : Store 2.5 kWh in the night cooking storage (NC) Dimensions of NC box = 0.4m x 0.32m x0.32m Then the heat loss rate from NC is: Night cooking storage time is approximately 5 hours (3 PM to 8 PM). Therefore energy loss from NC is about 150 Wh Store 3.5 KWh in the morning cooking storage (MC) Dimensions of the MC box = 0.561m x 0.32 m x 0.32m Then the heat loss rate from the MC is: Morning cooking storage time is approximately 16 hours(3PM to 7 AM). Therefore energy loss from MC is about 610 KWh Therefore the total energy trapped will be 6 KWh. The total lost from the NC will be 0.15 KWh. The total lost from MW will be 0.61 KWh

  7. Dimensions of storage unit Mass of sand required to store 6 KWh = 150 kg Volume of sand (density =1600 kg/cu.m) = 0.09375 cu.m 1 coke can = 350 ml = 0.0035 cu. M Dimensions of a coke can = 12 cm tall, 7 cm dia Insulation thickness = 20 cm 150 cm 72 cm 40 cm 56cm 32 cm 32 cm 72 cm 32 cm 32 cm 14 cm Night Cook Storage Morning Cook Storage

  8. Night cooking (7 PM) High internal conductivity (More Aluminum, more heat spreaders) Insulated cook surface cover Hinge Cook surface Insulation (Rice husk + air gap) Sand Thermocouple location Aluminum heat spreaders (use cans but open them out to form sheets) Heat Flow Path

  9. Morning cooking (7 AM) Lower internal conductivity, high heat capacity (Less Aluminum and heat spreaders, more sand) Insulated cook surface cover Hinge Cook surface Insulation (Rice husk + air gap) Sand Heat Flow Path Thermocouple location Aluminum heat spreaders (use cans but open them out to form sheets)

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