A New Solar Cooker Concept: Remy & Francis Modelling & Simulation: Jonas Realization: Remy & Jonas.

A New Solar CookerA New Solar Cooker

Concept: Remy & Francis

Modelling & Simulation: Jonas

Realization: Remy & Jonas

Many Solar CookersMany Solar Cookers

Creative SolutionsCreative Solutions

Mobile Picnic-CookerCooker from windshield-cover

Whats missing?Whats missing?

The New IdeaThe New Idea

• Sun from above

• 2x sun from below

• Big mirrors to avoid tracking

• Convection working for us (Heat goes up)

• Less glass to pass through

We WantWe Want

More Energy / More Energy / Higher Higher Temperature (box)Temperature (box)

Less Tracking (3 Less Tracking (3 hour tracking-free)hour tracking-free)

Eye Safety (only 1.6 Eye Safety (only 1.6 times sun times sun concentration)concentration)

Robustness (long-Robustness (long-lasting material)lasting material)

The Mirrors – The Mirrors – DaytrackingDaytracking

9 am 12 am

• Height• Cooker size• Mirror size

Tracking-free time

3 hours

The Mirrors – Seasonal The Mirrors – Seasonal TrackingTracking

Winter, sun at 60 degrees Summer, sun at 90 degrees

• Mirror-width• Angle between mirrors• Maximum angles for summer & winter

Simulating Sun & Simulating Sun & MirrorsMirrors

Loss = Cosinus Loss = Cosinus of hitting angleof hitting angle

Hitting angle = Hitting angle = sun angle + 2x sun angle + 2x mirror anglemirror angle

Winter: 12% Winter: 12% loss through loss through angleangle

Situation in Winter

Simulating Sun & Simulating Sun & MirrorsMirrors

Loss = Cosinus Loss = Cosinus of hitting angleof hitting angle

Hitting angle = Hitting angle = sun angle + 2x sun angle + 2x mirror anglemirror angle

Summer: 43% Summer: 43% loss loss through through angleangle

Support mirrorSupport mirror

Situation in Summer

The Mirrors - The Mirrors - ConstructionConstruction

• Moveable sideways for daytracking

• Adjustable angle for summer/winter

• Room for cooking stand

The Mirrors - The Mirrors - ConstructionConstruction

Material: Aluminium 2 mm, rivets, silicon, glass-mirrors, wheels

Tools: Saw, riveter, file, silicon-pistol, drill

The CookerThe Cooker

• No interference with the mirrors and the tracking

• No Shadows

• Good thermal properties

The CookerThe Cooker

• No interference with the mirrors and the tracking• No Shadows• Good thermal properties

Whole ModelWhole Model

Final ModelFinal Model

Thoughts On The CookerThoughts On The Cooker Several concepts:

• Mirror/mirrors on top

• Absorbing walls inside

• Opening mechanism

• Different fixation

• Glass cage on bottom

• Mirror(s) on bottom

• No Absorber

Thoughts On The CookerThoughts On The Cooker• Frame with insulated absorber

• Protective aluminium-cage on the outside

• Insulation inside (white/silver)

• Mirror on the bottom

• Glass cage with mirrors on the bottom (not shown)

Thoughts On The CookerThoughts On The Cooker

Absorber completely insulated

Double-glass top with air and insulation

DimensionsDimensions

Construction started

What is it capable of?

Cooking Power

Cooking Power = Absorption of the sun on the cooking plate.

Depends on: Absorption of the cooking plate Reflectivity of the mirrors Intensity of the sun Loss through angles Reflection of the glass

Power from above Cooking Power = Power from above + power

from mirror 1 + power from mirror 2

Power from above = sun intensity * cooker size * glass reflectivity * absorption efficiency

Power from above = 800 W * 0.1 sqm * 0.9 * 0.9 = 65 W

Reflectivity of double glass

Size of the cooker

Sun intensity per sqm

Absorption efficiency

Power from mirror Power from mirror = sun intensity * cooker size *

mirror reflectivity * cos(sun angle + 2*mirror angle) * glass reflectivity * absorption efficiency

Power from mirror = 60 W * cos (angle)

Cosinus(angle) between 0.5 and 0.9

Power from both mirrors approximately 65-100 W

Comparison with Box Cooker

Box Cooker:

Power from above = 65 WPower from mirror < 55 W

Max. Cooking power = 120 W

New Cooker:

Power from above = 65 WPower from Mirrors = 65-100+ W

Max. Cooking power = 165+ W

And: • 3 h tracking free• better heat storage

ConclusionConclusion

Cooker is under construction Cooker is under construction (outside!)(outside!)

Expected cooking-power around Expected cooking-power around 125 125 WW

Tests will soon be made..Tests will soon be made.. Hopefully you can all come and eat Hopefully you can all come and eat

with us.with us. Thanks Remy for the new creative Thanks Remy for the new creative

concept and the possibility to work concept and the possibility to work on it and Tency and the CSR for the on it and Tency and the CSR for the opportunity to conduct this project opportunity to conduct this project and to present it. And of course...and to present it. And of course...

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