Author(s) Mingle Liu, Shuangyan Wang, Kerong Li^*

Affiliation(s)
Xiangyang Hospital Affiliated to Hubei University of Traditional Chinese Medicine, Xiangyang, China.

ABSTRACT

Background: We referred to nearly 40 years of development and application progress of solar dryer in China literature, especially its application in the field of Chinese herbal medicine drying. Objective: We explored the development direction of China’s development and application of solar dryers, especially focusing on its development and application in traditional Chinese medicine drying. Method: Five types of solar dryers including the greenhouse type solar dryer, the collector type solar dryer, the collector-greenhouse type hybrid solar dryer, the integrated solar dryer and the focusing type solar dryer accounted for the development and application of solar dryers up to 95% in China. The first three types of solar dryers are low temperature dryer (less than or equal to 70°C), while the latter two kinds of solar dryers are high temperature dryer (more than 70°C). In this paper, we respectively introduced and compared the structure, working principle, applications, advantages and disadvantages, and the research status of these five dryer. Results: The integrated solar dryer and the focusing type solar dryer belong to the high temperature dryer types are the future direction of development. Among them, the integrated solar dryer is relatively simple structure and has more promotion prospects. These two kinds of key drying device used in the dryer is the development direction of high efficient vacuum tube. On the other hand, because of their low cost, simple structure and the dry material requirements etc., the three types of low temperature dryers at low temperature for drying materials are also indispensable in the practical application. In contrast, the collector-greenhouse type hybrid solar dryer has more advantages, is the development direction of low temperature drying category. Conclusion: The collector tube which is the key element of the dryer was the core technology of solar dryer. Our country develops more successful of the all-glass vacuum solar thermal collectors and heat pipe-glass vacuum tube. Efficient vacuum tube collector technology is the future developed direction and is equally important to improve the quality of traditional Chinese medicine and dried.

KEYWORDS
The Solar Energy Drying Device, Vacuum Tube Collector, Traditional Chinese Medicine Drying

Cite this paper
Liu, M. , Wang, S. and Li, K. (2015) Study of the Solar Energy Drying Device and Its Application in Traditional Chinese Medicine in Drying. International Journal of Clinical Medicine, 6, 271-280. doi: 10.4236/ijcm.2015.64034.

References
[1]   Zhang, J.G. (1999) Review on the Development of Solar Energy Dryer. New Energy, 21, 30-34.

[2]   Li, J.H. (1999) Application of Solar Dryers in Our Country. Solar Energy, 1999, 23-24.

[3]   Xu, C.X. and Ning, W. (2004) Introduce the Simple Solar Wood Drying Chamber. Forestry of China, 55, 38-39.

[4]   Liu, M.L. and Li, K.R. (2005) Investigation of Simple Box Type Solar Cooker Drying Slices. Chinese Journal of Hospital Pharmacy, 25, 580.

[5]   Liu, S.Y. and Li, L.D. (2000) Utilization of Solar Drying and Its Application in Industrial and Agricultural Production. New Energy, 22, 9-15.

[6]   Tu, J.M. (1992) The Design Problem of the Household Solar Dryer. Journal of Yunnan Normal University (Natural Sciences Edition), 12, 1-4.

[7]   Zhou, W.L. and Luo, X.G. (1986) Application of Solar Collector Drying Device in Traditional Chinese Medicine Pills. Chinese Traditional Patent Medicine Research, 1986, 36.