| Summary: | 碩士 === 國立屏東科技大學 === 機械工程系 === 92 === The tradition drying methods adopted for agricultural product are commonly fire-based or electricity based ,more specifically, using high temperature to dry agricultural product. In general, those methods are energy consuming, costly, pollutant, fire hazardous, and short in product life. Therefore, this study aims to application a low-temperature-low-humidity dehumidifying dryer for energy saving and safety purposes. The concept of this dryer is based on replacing the freezing compressor with the traditional diesel or electric heater inside a dryer, then condensing and recycling the thermal energy contained in the air discharged in a drying room as the heating energy. Such method can save a considerable amount of energy.
This research is application of low-temperature-low-humidity on the dehydration of pineapple. The experiment material is pineapple provide by Mr. Chen in Neipu. It is intend to find out the property of drying pineapple. And it set the temperatures are 20℃,30℃,40℃,50℃, hot-air 90℃, and frozen-dry methods. The last water content of pineapple slices after drying is 35% and frozen-dry after drying is 5%. The physical property analysis and chemical analysis be conduct to test the TPA, Vitamin-C, pH, Aw, L,a,b value, white index, and SEM of pineapple slices. The results show the ideal drying temperature for save the most Vitamin-C contain is 40℃.
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