Solar Cooker
Solar Cooker School: SMJK Yu Hua Team Members: Tang Qi Yau Er
Zhi En Teoh Jack
Abstract A solar cooker is a device that uses energy from the
sunlight to cook or sterilize food and drink.
Solar cooker uses no fuels, it means the user does not need to
fetch or pay for the gas, firewood, electricity and other
fuels.Efficient way to save energy Does not pollute the
environment
To reduce the impact and dependence of fossil fuels
To cut down utility cost and save mother natureObjectives The
Earths natural resources is now decreasing rapidly. Scientists had
discovered that all the non-renewable sources will be depleted in
2035.
Problem:
How to save energy?How to help people to cook food and water?How
to reduce the impact and dependence of fossil fuels?How to cut down
utility cost and save mother nature?
Problem Statement
Procedure
Reflection of light
Refraction of light
Greenhouse EffectBasic Principles Occurs when light rays on an
opaque object bounces on it.Aluminum foil is the best reflector and
we had choose it for our solar cooker.In our solar cooker, we added
8 surfaces of aluminium foils in the inner surface of our solar
cooker to have a better reflection.Reflection of lightOccurs when
light rays enters 2 mediums where its density is different, causes
it to bends.The wrapping paper in our solar cooker helps to refract
the light rays onto the container.The convex lens also focuses the
light rays onto the containers.b) Refraction of lightGreenhouse
effect if a phenomena that our Earth is facing, heat cannot be
released out because heat is trapped by a layer of carbon
dioxide.In our solar cooker, we added a layer of wrapping paper to
act as the layer of carbon dioxide.In our solar cooker, we added 4
pieces of poly foam as a heat insulator to prevent the loses of
heat and maintain the temperature of water.c) Greenhouse EffectThe
Colour Chosen Black and dull ( to absorb heat ) Black Mounting
Board Black Pebbles
Silver ( to reflect light) Aluminum Foil 1. Black and Dull Black
is more suitable to absorb heat if compare to other
colours.Therefore, we choose black mounting board as the outer
surface of our solar cooker.We also placed some black pebbles in
the container to gain more heat. 2. Silver and shiny
We built the inner surface of our solar cooker with the
aluminium foil because silver and shiny surface can reflect more
light. It also helps to focus the light onto the
container.Specialities of our Solar CookerEasy to measure the
temperatureEasy to fill in and take out the waterWater
resistantPortable
ExperimentInitial temperature (Degree Celsius)Final temperature
(Degree Celsius)1st29432nd29513rd29594th2955*Result of
competition3047Trial and result of competitionInsufficient of
materialsThe changes of the weatherThe changes of direction of the
sunProblem during the experimentIn recent years, the resources on
Earth is going finish and it will deplete one day soon.Solar cooker
is a great invention to reserve the resources on Earth.Human should
save the resources and invent some gadgets (like solar cooker) to
replace the resources.ConclusionThank you very much!!!
