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https://open.uns.ac.rs/handle/123456789/15417
Title: | Development of a greenhouse-type solar dryer for medicinal plants and herbs | Authors: | Müller J. Reisinger G. Kisgeci J. Kotta E. Tešić, Miloš Mühlbauer W. |
Issue Date: | 1-Jan-1989 | Journal: | Solar and Wind Technology | Abstract: | The economy of medicinal plant production is burdened considerably by the energy costs of drying. To substitute fossil energy, a solar heated dryer was developed, taking a plastic film greenhouse as superstructure to lower the initial costs. The solar air heaters, being incorporated into the roof, consists of a black absorber tissue, which is placed between the transparent cover of the greenhouse and an insulating air-bubble foil. To obtain a modular design, the system is structured along the ridge into segments of 2 m width. Each segment forms an independent solar air heater/batch dryer unit and is operated by a fan with a power consumption of 500 W. A prototype was tested in Yugoslavia, drying mint, sage and hops. The drying process from an initial moisture content of 80% w.b. to a final moisture content of 11% w.b. took 3-4 days. The load is 250-500 kg fresh material per segment. Maximum temperatures have been within a range of 40-60°C. The total pressure drop is 50 Pa at an air flow rate of 3300 m3/hr per segment. Compared to conventionally dried crude drugs, the percentage of active ingredients was up to 40% higher. The low investment and operating cost and the high quality of the crude drugs permit the solar dryer to be used in agriculture. © 1989. | URI: | https://open.uns.ac.rs/handle/123456789/15417 | ISSN: | 0741983X | DOI: | 10.1016/0741-983X(89)90086-6 |
Appears in Collections: | Naučne i umetničke publikacije |
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