Thames & Kosmos Solar Cooking Science Manual

Thames & Kosmos Ikke kategoriseret Solar Cooking Science

Læs gratis den danske manual til Thames & Kosmos Solar Cooking Science (2 sider) i kategorien Ikke kategoriseret. Denne vejledning er vurderet som hjælpsom af 6 personer og har en gennemsnitlig bedømmelse på 4.8 stjerner ud af 3.5 anmeldelser. Har du et spørgsmål om Thames & Kosmos Solar Cooking Science, eller vil du spørge andre brugere om produktet?

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Side 1/2

Instructions

Warning! — This set contains chemicals

that may be harmful if misused. Read cau-

tions on individual containers carefully. Not

to be used by children except under adult

supervision.

Only for use by children 8 years of age and

older. Use only under careful supervision

of adults who have familiarized themselves

with the kit’s written safety precautions.

Caution! — Read the instructions before

use, follow them, and keep them on hand

for reference.

Individual parts may have sharp points, corners,

or edges. Do not injure yourself!

Keep small children and animals away from the

experiments.

Store the kit out of the reach of small children.

Keep the packaging and instructions as they con-

tain important safety information.

This work, including all its parts, is copyright protected. Any use outside the

speciﬁc limits of the copyright law is prohibited and punishable by law without the

consent of the publisher. This applies speciﬁcally to reproductions, translations and

microﬁlming and the storage and processing in electronic systems and networks.

We do not guarantee that all material in this work is free from other copyright or

other protection.

Text and concept: Uwe Wandrey; Project manager: Manfred Berrer; Graphic Design:

designstudio www.c-r-1.de

® Thames & Kosmos is a registered trademark of Thames & Kosmos, LLC.

Editing: Ted McGuire; Additional Graphics and Layout: Dan Freitas

Distributed in North America by Thames & Kosmos, LLC. Providence, RI 02903

Phone: 800-587-2872; Email: support@thamesandkosmos.com

Printed in Germany / Imprimé en Allemagne

Contents

Advice for Parents and Adults

Concentration of Light Rays

1. 7 Triangular silver pieces

2. 7 Trapezoidal silver pieces

3. 1 Small cardboard part

4. 3 Wooden clips

5. 1 Cooking pot

6. 1 Rubber band

7. 2 Wooden skewers

8. 1 Instruction sheet

Before we start to assemble and use the solar cook-

er (also called solar collector), we will ﬁrst explore

the scientiﬁc concepts behind the operation of the

solar cooker.

Catching Solar Energy

The sun is an incredibly powerful energy source. In

the sun, hydrogen atoms are combined together

into helium atoms. This process, known as nuclear

fusion, releases vast amounts of energy which are

radiated outward from the sun into space in the

form of electromagnetic energy, some of which we

can see as visible light and feel as heat.

Because of the distance between the sun and

Earth, the light rays that reach Earth are all almost

parallel to one another. To take full advantage of

these parallel light rays, you have to know how to

catch them.

Parallel rays of

light from the sun

Concentration of light

rays

passing through the lens

Magnifying

glass

Lens

Focal point

The Magnifying Glass

One way to concentrate the sun’s light and heat

radiation is to use a . With this magnifying glass

method, the rays passing through the lens are bent

toward a single point, called the . The focal point

illustration above shows how the parallel light is

focused by the lens of the magnifying glass to con-

verge at the focal point. The light and heat energy

is concentrated at the focal point. Through this con-

centration of energy, very high temperatures can

occur at the focal point. It can also get very bright

at the focal point.

The Parabolic Mirror

The direction of the sun’s rays can also be altered

with a curved mirror, so that the rays converge at

one focal point. The whole surface of the mirror

reﬂects the parallel light rays toward this single

point. As with the magnifying glass, it can get very

hot and very bright at the focal point. But in this

case, the focal point is right at the center of the

mirror instead of some distance below the magnify-

ing glass. Such a mirror is called a parabolic mirror

because its curved reﬂector is in the shape of a

parabola.

Conversely, if there was a light source (e.g. a

light bulb) at this focal point, its rays would be bent

and reﬂected outward in parallel. That is how the

reﬂectors for a ﬂashlight and car headlights work.

These parabolic mirrors are called solar collec-

tors, and can be used as solar cookers. We will now

assemble the parts in this kit into a parabolic solar

cooker.

With a Parabolic MirrorWith a Magnifying Glass

Parallel rays of light from the sun

Parabolic mirror Focal point

With this science kit, your child can experiment with

simple materials to assemble a solar cooker that

demonstrates how the energy of the sun can be

used for heating and cooking. In the world today,

solar energy is becoming an increasingly important

energy source. Solar power plants are expected to

provide us with environmentally friendly, zero emis-

sion energy in the near future. In large solar ther-

mal power plants, solar heated air spins turbines

to generate electric power. With this solar cooker,

children can see ﬁrsthand how solar energy works

in a simple, easy to comprehend device.

It is common to have questions about the safety of

a science kit. The experimental equipment in this

kit meets US and European Safety Standards. These

standards impose obligations on the manufacturer,

such as forbidding the use of any particularly dan-

gerous chemicals. The standards also stipulate that

adults should assist their children with advice and

assistance in their experiments. Tell your child spe-

ciﬁcally that he or she must follow all the instruc-

tions when experimenting. Before the experiment,

please discuss the warnings and safety rules with

your child.

Proper assembly and use of the solar cooker

must be overseen by an adult. We hope you and

your child have a lot of fun while experimenting

with the solar cooker!

WARNING! HOT SURFACES!

The cooking pot gets very hot during operation.

You must use the wooden clip, gloves, or oven mitts

when moving or ﬁlling the cooking pot.

Caution! Sharp Points — The enclosed wooden

skewers have sharp tips. Misuse may cause personal

injury.

Caution! — Do not stare directly at the sun or at

the concentrated sunlight reﬂecting off of the solar

cooker.

Caution! — Do not leave the solar cooker unattend-

ed. There is a risk of ﬁre when exposed to sunlight.

This is particularly true in the vicinity of woods or

dry grassy ﬁelds! Disassemble the cooker after each

use.

Before experimenting, gather all the necessary

parts. In addition to the parts in the kit, you will

need all-purpose glue or a glue stick.

Safety Information

Solar Cooking Science Theory

Assembly

Solar Cooker Assembly

You will need:

7 Triangular silver pieces

7 Trapezoidal silver pieces

1 Small cardboard part

3 Wooden clips

1 Cooking pot

1 Rubber band

2 Wooden skewers

In addition, you will need all-purpose glue or a glue

stick for the cardboard.

Assembly

We will start with the silver pieces that form the

parabolic mirror. First we will attach one triangular

silver piece to each trapezoidal silver piece. Place

the one triangular piece and one trapezoidal piece

with their white cardboard sides facing up. See

Figure 1.

Cut the rubber band at a point 25 centimeters

(about 10 inches) from one of its ends. You will now

have one short and one long piece of elastic cord.

Tie the ends of the short elastic cord together to

form an elastic ring. Repeat for the long cord to

form a larger elastic ring.

Piece together the seven silver sections, one at

a time using the tabs and slots on each piece, as

shown in Figure 4. They will ﬁt together in the

shape of a parabola, like an umbrella. Make sure

the points of each piece ﬁt together as shown in

Figure 5.

Stretch the elastic rings into place on the parabolic

shape. Make sure the elastic rings are securely

hooked under the tabs all the way around.

The white cardboard side is facing up.

Apply glue to the silver side of the two adhesive

ﬂaps on the triangular piece, as shown in Figure

2. Position the ﬂaps on the trapezoidal piece as

shown, and press the two parts ﬁrmly together.

Follow the instructions for the speciﬁc glue you are

using to be sure of the appropriate drying time.

Repeat for all 14 of the silver pieces. When they

have all been glued together, you will have seven

assembled sections. Be sure to allow enough time

for the glue to dry completely.

A) Apply adhesive here

B) Attach here

Triangular

Silver Piece

Elastic ring

Wooden clip

acts as a

handle

Fruit on a

skewer

Melted chocolate

Elastic ring

Seven Assembled

Sections

Adhesive Flaps

Trapezoidal

Silver Piece

Align the pieces

Glue together

Assembly

Seven pieces

Alignment of points

Finished assembly

Finished solar cooker

Chocolate fondue

Cooking

pot

Cardboard

Stand

Cooking stand

Assembly

Finishing the Solar Cooker

WARNING! The cooker and cooking pot can get

very hot! Make sure you use the wooden clip as

a handle for the pot. Do not touch metal parts

with your bare hands if they have been in the

sun. Use gloves or oven mitts.

Important! After each use, you must rinse out

the cooking pot and make sure it is clean.

Do not eat food that is under-cooked or food to

which you are allergic!

Make sure that you wipe up any spills inside the

solar cooker immediately with a clean towel.

Experiment

Testing the Solar Cooker

Let’s put the solar cooker to work and see what

we can make! To start, you have to take the solar

cooker outside on a sunny say. The solar cooker

must be oriented towards the sun, so that the sun’s

rays come into it as straight as possible.

This solar cooker is designed so that it captures

the sun’s rays best between 11 a.m. and 3 p.m. in

the summer time. If the sun is higher or lower in the

sky, you may need to use a towel or some card-

board to prop the solar cooker up so it is directly

facing the sun. Depending on your location, the

time of day, and the time of year, your solar cooker

will need to be oriented differently. You will have

to experiment to ﬁnd which position works best.

Make sure you set up the cooking pot as shown

in Figure 8, on the stand made with the wooden

clips. This helps keep the pot level and in the best

position at center of the solar cooker.

Experiment

Solar Fondue

Now you can test out some recipes in your solar

cooker! Let’s start with a chocolate fondue recipe.

All you need to do is set up your solar cooker and

put small pieces of chocolate (e.g. chocolate chips)

into the cooking pot. When the chocolate has

melted, remove the cooking pot from the solar

cooker using the wooden clip as a handle. Then use

Experiment

Your Own Solar Cookbook

Experiment with cooking the following items in

your solar cooker. How long does each thing take to

cook at a particular time of the year? What factors

affect the performance of the solar cooker?

Food

Date and

Starting Time

Length of

Cook Time

Boiled Water for Tea

Toasted Bread

Heated Soup

Baked Potato

Roasted Nuts

Hard Boiled Egg

Now, you have ﬁnished building your solar cooker!

The seven sections can be taken apart and reassem-

bled easily, making your solar cooker very portable.

As you can see, your solar cooker is not a

perfectly curved parabola. The cross section is a

polygon with ﬂat sides, instead of a curved parab-

ola. This means the sun’s rays are not reﬂected to

one exact point, but they are all reﬂected onto the

cooking pot to heat it up.

Now we will ﬁnish the solar cooker and test it. You

will need the two wooden clips, the small card-

board piece, and the cooking pot. Put these parts

together as shown in Figures 7 and 8 below.

the skewers to dip pieces of fruit into the chocolate.

Wait a few moments for the chocolate to cool on

the fruit, and then enjoy!

Real World Solar Cooking

Solar cookers like the one in this kit are used all

over the world. In developing countries and in

countries where poverty prevails, fuel and electricity

are expensive and difﬁcult to obtain. Solar cook-

ing is used in these places because the only energy

needed is provided by the sun free of charge! Solar

cookers are also used by campers and hikers who

want to cook in remote places without power.

Solar cookers demonstrate an important clean,

renewable energy technology that is used not only

for cooking, but also for heating buildings and gen-

erating electricity.

Solar tea kettle Solar oven in Nepal

Produkt Specifikationer

Mærke:	Thames & Kosmos
Kategori:	Ikke kategoriseret
Model:	Solar Cooking Science

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