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

The basic principle of solar cooker works

sunlight is converted into thermal energy that is retained and used for outdoor cooking purposes

Thermal energyDirect sun Light

Correct position for reflector on box cooker:

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

The Limitations of solar cookers

1. It can take very long to cook a meal.2. It is not always sunny3. 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 areas6. Can be inconsistent and may produce inedible food

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 =10\60

= tan-1 (10\60)

=

Solar oven dimensions

Project Mousky wood were utilizedThe thickness 4.2 cmThe dimension of the box used was 61cm x 62cm x41cm ,absorber plates were 50cm by 50cm

Solar oven dimensions

Experimental procedure

The measurement results was

recorded and calculated according

to the American Society of Agricultural

Engineers Standard ASAE S580

Environmental factors

Experimental video

Results and discussion

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].

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

Effeciency

• 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

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

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

The End

Thank you very much!