การศึกษาแบบจำลองทางคณิตศาสตร์การอบแห้งพลังงานแสงอาทิตย์ของกล้วย

Surajitr Pramuang; Weerachon Meethan; Lerdpan  Piansangsan; Samran  Lertkonsarn; Chadarat  khwunnak

Authors

Surajitr Pramuang Faculty of Science and Technology, Loei Rajabhat University
Weerachon Meethan Faculty of Science Technology, Loei Rajabhat University
Lerdpan Piansangsan Faculty of Engineering, Pitchayabundit College
Samran Lertkonsarn Faculty of Engineering, Pitchayabundit College
Chadarat khwunnak Faculty of Science, Pitchayabundit College

Keywords:

Solar dried banana, Mathematical model, Solar dryer, Greenhouse cabinet

Abstract

Mechanism of solar drying is the heat transfer by hot air. This study fabricated a small greenhouse solar dryer for banana drying. Its sun facing side designed to be the parabolic curve covering with the clear polycarbonate sheet. The solar absorber at the bottom painted flat black color. There were 3 rounds of experiments with 3 days for each. The initial moisture contents were 235,63, 236.40 and 248.58 %d.b. obtaining final moisture contents of 23.37, 19.16 and 26.38 %d.b., respectively under solar intensity of 543.8 W/m² and hot air flow rate 0.08 kg/s. The drying rate was averaged of 9.05 kg/h. The mathematical model for drying was formulated. The equation of Newton and Lewis model was MR =
e^-0.1022t (r² = 0.9784, RMSD = 0.1059, MBD = 0.0112). The equation of Page model was (r² = 0.9592, RMSD = 0.1463, MBD = 0.0214). The equation of Modified Page model was (r² = 0.9784, RMSD = 0.1060, MBD = 0.0110). The equation of Henderson and Pabis model was MR = 1.2055e^-0.1012t (r² = 0.9874, RMSD = 0.0832, MBD = 0.0069). The equation of Two Term model was MR = 0.9162e^-0.0511t + 0.0110e^-0.0511t (r² = 0.9449, RMSD = 0.1350, MBD = 0.0182). And, the equation of Wang and Singh model was MR = 1 – 0.0633t + 0.0010t² (r² = 0.9882, RMSD = 0.0602, MBD = 0.0036). The appropriate mathematical model for banana drying was Wang and Singh model.

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