Prototype and model of passive tropical fruit dryer utilizing a flexible transpired solar collector

Samantha Huselstein, S. J. Weinstein, R. Stevens
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引用次数: 2

Abstract

We explore a novel drying system to preserve tropical fruits, motivated by the needs of a rural farming co-op in Haiti. Most solar drying technologies rely on glazed collectors, but these are not readily accessible in rural communities. A low cost and low maintenance prototype drying system is designed, built and tested. The system comprises a transpired solar absorber made from cheap landscape fabric, a drying chamber, and a chimney. The drying chamber houses the fruit and the chimney induces airflow. In tests on thinly sliced bananas, the novel collector efficiency regularly exceeds 50% with an average temperature rise from inlet to outlet of the device of over 20°C. In one test, 4kg of banana slices per square meter of absorber area are dried from an average moisture content of 73wt% to 8wt% over two days. A preliminary mathematical model for the entire drying system is developed that agrees favorably with experiments.
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利用柔性蒸发太阳能收集器的被动式热带水果干燥机的原型和模型
我们探索一种新的干燥系统来保存热带水果,受到海地农村农业合作社需求的启发。大多数太阳能干燥技术依赖于玻璃收集器,但这些收集器在农村社区并不容易获得。设计、制造和测试了一个低成本、低维护的原型干燥系统。该系统包括由廉价景观织物制成的蒸发太阳能吸收器、干燥室和烟囱。干燥室存放水果,烟囱引导气流。在薄片香蕉的试验中,新型集热器的效率经常超过50%,从设备的入口到出口的平均温升超过20°C。在一项试验中,每平方米吸收器面积4kg香蕉片在两天内从平均含水量73wt%干燥到8wt%。建立了整个干燥系统的初步数学模型,与实验结果吻合较好。
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