The document investigates the efficiency of a solar cooker box with four reflectors. It describes how solar cookers work by converting sunlight to thermal energy. The advantages are listed as reduced travel for firewood, lower costs than other fuels, and reduced emissions. Limitations include long cooking times, reliance on sunny weather, and inconsistent results. Dimensions and materials used to construct the solar oven are provided. Testing showed efficiency increased with smaller differences between collector and ambient temperatures. Recommendations include adding wheels and improving the window seal to boost performance.

1. Investigation of the efficiency for a
solar cooker box
with four reflectors

2. The basic principle of solar cooker works
sunlight is converted into thermal
energy that is retained and used for
outdoor cooking purposes
Direct sun Light Thermal energy

3. Correct position for reflector on box cooker:

4. The advantages of solar
cookers
1. In villages, women have to travel less often to
forage for firewood, thus keeping them closer
to home and safe as a result
2. Cheaper than cooking with firewood or
charcoal
3. Reduced CO2 and methane emissions
4. Solar Cookers can be easily constructed in a
matter of hours after very basic training
5. Solar cookers are generally light-weight

5. The Limitations of solar
cookers
1. It can take very long to cook a meal.
2. It is not always sunny
3. Solar cooking can only be performed when the
sun is strong enough during mid-day, however
hot food may be required much earlier on
4. Cooking has to be undertaken outside which may
pose additional threats in developing countries
5.Will not perform well in windy areas
6. Can be inconsistent and may produce inedible
food

6. Solar oven dimensions
Ar: Area of one reflector
Ar =0.5 × 0.5=.25 m2
A apreature=0.415 × 0.415=0.172225 m2
A insaid=0.52 × 0.53=0.2756 m2
I=5562 w/m2
A outside =0.61 × 0.62=0.3782
Tan =1060
= tan-1 (1060)
=

7. Solar oven dimensions
Project Mousky wood
were utilized
The thickness 4.2 cm
The dimension of the
box used was 61cm
x 62cm x41cm
,absorber plates
were 50cm by
50cm

8. Solar oven dimensions

9. Experimental procedure
The measurement results was
recorded and calculated
according
to the American Society of
Agricultural
Engineers Standard ASAE S580

10. Environmental factors

11. Experimental video

12. Results and discussion

13. 1.temperature
increases
exponentially
with the increase
of time according
to the thermal
energy
accumulation due
to the green
house effect
2. Similarly, the
cooking power
has the same
trend, with the
time consumed.
This trend agree
well with the
previous works
Chidi [ 25].

14. Energy as well as power increased linearly as the
difference between collector and ambient temperature
increased

15. Effeciency

16. 77.0
76.5
76.0
75.5
75.0
74.5
74.0
30 35 40 45 50 55 60 65 70 75
Efficiency h %
DT (oC)
• The Energy (E)
per second
radiated by the
absorber plate
is dependent on
the Collector
Temperature
• It is found that
the Efficiency
increases with
decreasing
temperature
difference
between
collector
temperature
and ambient
temperature

17. Conclusion and Recommendations
 A wooden solar box cooker was successfully
constructed with cheap and Locally available material
with efficiency About 75%
 Efficiency, cooking power and standard cooking
power Were found to increase with decreasing
temperature difference between collector
temperature and ambient temperature
 The optimum time for cooking is the mid-noon and
afternoon ,because the standard power and the
efficiency becomes constant

18. Conclusion and Recommendations
 Mounting a movable wheels to the solar
Cooker base for the optimum concentration of
the solar power , as well as the correct
position of the reflectors on box cooker
 Mounting a rubber joints around the aperture
window to minimize thermal leakage
 Increase the area of the absorber plate such
that it covers the whole inside box area

19. The End
Thank you very
much!