I have studied in solar thermal application like prince 40. solar cooker work on the basic principle l : Sunlight is converted to heat energy, that is used for cooking. I cooking a rice in prince 40 system. firstly I washing cooker and prince 40 cooking system. Then I have weight 250 gm rice & 500gm water. and adjusting prince 40 system. then cooker putting in prince40.

some calculation part

Given

weight of cooker : 1074gm,rice weight 250 gm, weight of water 500.temp of water 27.

1) Time : 11.10 ,solar radiation 1005 =w per m^2 .Focal point temperature =51.4 , other side temp 37.2

2) Time 11:20 ,solar radiation = 1045 w per m^2 .Focal point temperature =69 , other side temp 42.

3) Time : 11.30,solar radiation =1113 w per m^2 .Focal point temperature=82 , other side temp=72

4) Time : 11.40 ,solar radiation =1110 w per m^2 .Focal point temperature =92 , other side temp=42

5) Time : 11.50 ,solar radiation =1109 w per m^2 .Focal point temperature=85 , other side temp=47.

7) Time : 12.00 ,solar radiation= 1110 w per m^2 .Focal point temperature =92 , other side temp =70.

ready cooking weight :– 745 gm

Time period in ready rice :– 1 hour =3600 second

Efficiency = output /energy insolation *100

Rice

by using formula of efficiency

=0.25*0.78*(71-27)

=0.25*0.78*44

=8.58 KJ ….1

water

by using formula of efficiency

=0.25*1*(100-27)

=0.25*73

=18.25 K …………….2

equation 1&2…….

= 8.58+18.25/3600

= 0.0075 KJ/sec

Avarage Solar Rotation

=R 1+R 2+R 3+R 4+R 5+R 6 / 6

=1005+1045+1113+1110+1109+1110 / 6

=6492 / 6 = 1082 W per m^2

Total prince 40 area =54984 cm square.

Total overlaping area =74.26 cm square.

Working area =5.49 meter square.

=7.5 watt

= 7.5 / 1082*5.49

Efficiency =3.80%