King Abdullah II School for Excellence / Jordan
Dec 12, 2015
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
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
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
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