King Abdullah II School for Excellence / Jordan

Electromagnetic spectrum:

Electromagnetic spectrum: is the range of all types of EM radiation .

solar water heaters

• There are two types of solar water heaters

flat plate collectors and evacuated tubes.

• Evacuated tubes perform better in colder

and/or colder conditions than their flat panel

counterparts. This is because of the vacuum in the

glass tube, which allows tube collectors to retain a

high percentage of collected heat. They work well

in freezing conditions where flat panels will not

work

solar cells :

the German Jordanian University

Renewable Energy Lab in the German Jordanian University

Inquiry question :

What is the effect of the panel color in solar energy absorption of radiant energy ?

Hypothesis

A solar panel with a rough black surface is

better at heating water than a panel with a light shiny surface

Experiments:

t(min)5 10 15 20 25 30

Sta

rt : 200m

l water

Tem

pera

ture : 2

2 °

C.

Temp(oc)Black Beaker

30 37 40 44 46 47

Temp(oc) Silver Beaker

24 28 30 33 36 37

OBSERVATION:

t(min)5 10 15 20 25 30

Sta

rt : 200m

l water

Tem

pera

ture : 2

2 °

C.

Temp(oc)Rough surface

25 30 35 37 40 44

Temp(oc) Smooth surface

23 25 28 30 32 33

OBSERVATION:

0

5

10

15

20

25

30

35

40

45

50

0 5 10 15 20 25 30 35

Tem

p(o

c)

t(min)

The differences between the temperatures of the black Beaker and the silver Beaker

الدورق األسود

الدورق الفضي

the black Beaker

the silver Beaker

The differences between the temperatures of the rough surface

and the smooth surface

0

5

10

15

20

25

30

35

40

45

50

0 5 10 15 20 25 30 35

Tem

p(o

c)

t(min)

جسم أسود أملس

جسم أسود خشن

the smooth surface

the rough surface

Model of the solar heater :

Conclusions

Every surface on Earth absorbs and reflects energy at

varying degrees, based on its color and texture

The amount of radiant energy absorbed varies depending on the degree of color of the

material and texture

Darker-colored objects absorb more visible radiation,

whereas lighter-colored objects reflect more visible radiation.

Recommendations and Suggestions :

storage of solar energy can be used in multiple uses such as cooking, heating

water for industry as well as agricultural

Governments recognize the need to invest in renewable energy, specifically in solar

energy.

Governments should encourage people to promote the uses of

renewable energy by installing solar panels to

generate electricity