1. REFLECTIVE COATINGS:
NEW GENERATION ENERGY
EFFICIENCY
DR. AK SAHA EXPERIMENTAL SCIENCE COMPETITION
Springdales School
Pusa Road

2. VIDEO

3. Comparison of Laboratories with
respect to emission of CO2
10
9
Emission of CO
8
2
7 Total CO2
6 emission
tonnes per year
5
Classroom CO2
4
per student
3
2
1
0
Physics Biology Chemistry Computer
Name of the
Laboratories

6. Without coating

7. With coating

8. OBJECTIVES
Study Solar Reflectance of building coatings.
Determine the best material for our
project.
Calculate the reduction in
internal temperature due to
reflected heat.
Explore into its future
prospects.

9. HYPOTHESIS
Reflective coatings will reduce internal
temperatures
Will lower the power
consumption of air
conditioners.
Implies better energy
conservation.
Lower Electricity bills.

10. Apparatus Required
I. Distemper Solution
II. Enamel Paint
III. Interior Paint
IV. Barium Sulphate

11. Apparatus Required
Spectrophotometer:
Is a device which measures the
reflectance as a function of the
wavelength of light.

12. Procedure
1. Different samples
were tested for their
reflectivity in
spectrophotometer.
Distemper
2. These materials were
applied on a glass slide
and adequate time of 4
to 6 hours was given
Interior
for them to dry by Paint
natural process. Enamel

13. COATING THE GLASS SLIDES MAKING THE DISTEMPER SOLUTION

14. Procedure
1. These glass slides were then bound to a frame which
was put in the spectrophotometer :
Reference Slide Inserted
Here
Sample Slide Inserted Here

15. TESTING SAMPLES ON
THE SHIMADZU UV 300
SPECTROPHOTOMETER

16. Observations
Distemper
100
90
Reflectance(%)
80
70
60
50
40
30
20
10
0
0 200 400 600 800 1000
Wavelength (nm)

17. Observations
Interior paint
100
90
80
Reflectance(%)
70
60
50
40
30
20
10
0
0 200 400 600 800 1000
Wavelength (nm)

18. Observations
E namel
100
90
80
Reflectance(%)
70
60
50
40
30
20
10
0
0 200 400 600 800 1000
Wavelength (nm)

19. Observations
Barium Sulphate
100
90
80
Reflectance(%)
70
60
50
40
30
20
10
0
0 200 400 600 800 1000
Wavelength (nm)

20. RESULT
Avg. Reflectance in Reflectance in short
Coating visible region(400-700 infrared
nm)
Distemper 55% 60-65%
Interior 70% 70%
paint
Enamel 55% 70%
Barium 92-93% 92-93%
Sulphate

21. Part II: Building The Prototype
A wooden box of size 20”x15”x11” was constructed.
Different samples were painted on
the box. Prototype
The surrounding temperature was
measured using clinical
thermometer.
The internal temperature was
measured with a thermocouple.
 Observations were made tested
for our hypothesis.

22. Temperature Observations
Coating Outdoor Initial Final Difference
Temp. Temp Temp in Temp
o
C (inside) (inside) o
C
o
C o
C
Distemper 35 35 32.5 1.5
Enamel 35 35 32 2
Interior 35 35 31 2.5
Paint

23. Coating Reflectance( Drop in
%) temp. in
VISIBLE INFRARED
prototype
Distemper 55 60-65 1.5
Enamel 55 70 2
Interior 70 70 2.5
paint Power Saving Calcula

24. CONCLUSIONS
100
Reflectance(%)
90
80
70
60
50
40
30
20
10
0
Distemper Enamel Interior Barium
paint Sulphate
Visible region Infrared

25. CONCLUSIONS
2.5
2
1.5
1
0.5
0
Distemper Enamel Interior
paint
Temperature drop

26. CONCLUSIONS FROM THE POWER SAVING
CALCULATOR
REFLECTANCE
COATING TAKEN
MONEY POWER CO2
SAVED SAVED SAVED (Kg)
(Rs.) (In KW) (0.527*B)
B
Distemper 60 3251 812.7 428.29
Enamel 65 3560 890.1 469.08
Interior 70 4179 1041 548.60
paint

27. Limitations
Opposite effect of reflective coatings in
winters.
Due to unavailability of most sensitive pair
of materials for the thermocouple only steel
and constantan could be used.
Variables like room dimensions, performance
of the AC, and insulation materials.

28. FUTURE PROSPECTS
 Barium Sulphate (pure form) if mixed with paints,
increases reflectance.
 Thermocouple can be made more accurate with Bismuth
and antimony which come at the extremes of the
thermocouple series.
 Along with the coatings the effect of thickness of the wall
on the indoor temperature can also be tested.
 Efficiency can be tested against clay, mud, water and
other conventional construction materials.