solar cooking quinton stowell product development manager nordson uv ltd
TRANSCRIPT
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Solar Cooking
Quinton StowellProduct
Development Manager
Nordson UV Ltd
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Overview of sessions1. Theory of Solar Energy/Cooking2. Solar –v– Wood/gas3. Design features of Solar Cookers4. Case Study in Peru5. Successful initiatives6. Practical session
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Who am I? – Nordson UV?
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Links with Peru
Peru Children’s Trust
Shantytown in Peru
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Why is Solar Cooking Important?
2,000 million cook with wood (TFL)20-25,000km2 of forest lost/year (UNEP)Contaminated water = 80% illnessesARI (Acute Respiratory Infections)Solar Cooking = no wood & no smoke
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Energy from the Sun?
Solar Constant = 1367 W/m2
Clear sunny day = 83% = 1134 W/m2
Engineers= 1kW/m2
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Energy from the
Sun?
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Theory behind Solar Energy
Low grade energyCollect/retain….. Box type cookerMagnification…..Parabolic cooker
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Parabolic and Box Cookers
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Wood/Gas – V – SolarWood Burners or Gas Solar Cookers
Disadvantages Advantages
Takes time to collect wood, and is using up natural resources.
Solar energy is free
Smoke filled rooms = ARI (Acute Respiratory Infections)
Smoke free cooking
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Wood/Gas – V – SolarWood Burners or Gas Solar Cookers
Advantages Disadvantages
Cook any time. Day/night/cloudy.
Only cook when it is sunny.
Gas is instantaneous and controllable.
Box cookers take time to heat up. Parabolic cookers need frequent adjustment.
Cook summer and winter.
Need to store cooker in rainy season.
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Parabolic – Design Features
Size of reflectorReflectivity of reflectorAccuracy of reflectorEmmisivity of cooking vessel
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Energy Calculations
Area = 1 m2
Power = 700 Watts1 litre of water = 7 to 8 minutesTemperature at focus = 420 deg C. (small black thermocouple)
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Box Cooker – Design Features
Greenhouse principleArea of collectionTransmission of glass/plasticEmissivity of cooking vesselInsulation of boxWAPI (Water Pasteurisation Indicator)
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SUNSTOVE ® DesignLow cost enclosureSloped side walls, scrap AluminiumFibreglass insulationClear glass/plastic cover80 – 100 deg C10,000 in SA & India
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Parabolic – v – Box CookerParabolic Cooker Box Cooker
Disadvantages Advantages
Needs frequent adjustment
Adjust once an hour.
More likely to be dazzled by reflected light.
Much less reflected light.
Unstable Very stable
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Parabolic – v – Box CookerParabolic Cooker Box Cooker
Advantages Disadvantages
Very high temperatures.
Only 80 – 100 deg C.
More like a BBQ or Grill Cooking takes much longer.
Easy to see it cooking quickly.
Not too sure it is working! (WAPI – 65 deg C)
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Trip to Peru
10 teenagers£30 of materialsWoodworkCardboardMetalworkFun time
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How did it go?WorkshopsLanguage!New skillsToo small!Too big!Rainy seasonYears later….
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What makes an Initiative Successful?
Choosing the right design for the right location.Not this one for £750 in Australia!
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What makes it successful?Over 4kWhr per m2 per day.e.g. India, China, South Africa.Robust, easy to use.Perform well/efficient.Local materials.Very low cost.
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Scheffler DesignCommunity Kitchen
- India
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Refugee Camp - CooKit
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What makes an Initiative Successful?
Marketing & contacts with organisationsExisting charitiesNGO’s – sustainable development Government initiativesDemonstrators – evangelistsLocal entrepreneurs Empowering the right people
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Useful informationwww.sunspot.org.ukwww.peruchildrenstrust.org.ukwww.sungravity.comwww.solarcooking.orgwww.itdg.org (Practical Action)www.sunspot.org.uk/ewb
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Making your Solar CookerSplit into groups2 hoursSafety
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Inner and outer sheets
Mark out according to the drawingCut with a pair of sharp scissorsFold with a block of wood.
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Make wooden frame and fit outer
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Fit insulation then inner panel
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Paint base plate and fit acrylic cover