Mathematical Modeling of Pineapple Drying using a Hybrid Heating System Combining LPG Heat Exchanger and Solar Dryer
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Abstract
This study aims to investigate the most suitable mathematical model for drying pineapple using a combined heating system consisting of an LPG-based heat exchanger and a solar dryer, as well as to examine the physical properties of the dried pineapple obtained from this drying process. Six empirical mathematical models were evaluated by comparing the moisture ratio, and the most appropriate model was selected based on the coefficient of determination, chi-square, and the root mean square error as performance indicators. For the physical quality analysis of the dried pineapple, the results showed that pineapple dried using the combined LPG heat-exchanger and solar-drying system exhibited better quality than pineapple dried using a solar dryer alone. Based on color measurements in the CIELAB by the International Commission on Illumination, the pineapple dried by the combined system presented a brighter yellow color and was less reddish-brown compared to that dried solely by solar energy, while the overall color difference was similar, at approximately 7.82. The shrinkage of the dried pineapple was 24.82 ± 1.8%, which was superior to that obtained from drying using only a solar dryer.
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Articles published in Journal of Industrial Technology Ubon Ratchathani Rajabhat University both hard copy and electronically are belonged to the Journal.
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