EFFICIENCY OF DRYER

In order to attain the goals of my study, i conduct an experiment of drying bananas in parabolic direct solar dryer..

1st trial of drying:
       highest temperature attained: 67 degree Celcius
       Drying time: 1.51 hours
2nd trial of drying:
       highest temperature attained: 62 degree Celcius
       Drying time: 2.2 hours
3rd trial of drying:

       highest temperature attained: 60 degree Celcius
       Drying time: 2.5 hours

average temperature = 63 degree celcius
average Drying time = 2.07 hours

*note: drying may vary in relative humidity of the surrounding..
         : inlet of air should be prioritize.
         : using of blower/fan for exhaust should be applied..


PICTURE(S) drying bananas:

tray inside the drying chamber of solar dryer:

tray outside (pure sun dry)

HOW TO MAKE PARABOLIC DIRECT SOLAR DRYER

MATERIALS: GALVANIZED THIN SHEETS STEEL, ANGLE BARS 1X1, GLASS, WELDING RODS..

METHODS:
         First, prepare all the materials, cut the galvanized thin sheets steel into desired shape (Parabolic shape), weld the chassis of the dryer which is composed of the angle bars, weld it together with the thin sheets to form the parabolic shape dryer, then after you finish weld it, paint the whole dryer as black (note* it is painted black to be the absorber of sun's rays to be converted into heat energy). Then, after it cut the glass then put in on the top of the dryer, which is in line with the shape of the dryer, also the glass is following the parabola curved, then paste it with silicon gel to let the glass stick with the steel.. then it is finish...

MATERIALS COST: 5,000 pesos (including labor)

SITE OF STUDY: (AGRICULTURAL ENGINEERING COMPLEX) MINDANAO STATE UNIVERSITY -GENERAL SANTOS CITY, PHILIPPINES

PICTURE(s) OF PARABOLIC DIRECT SOLAR DRYER: