Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 30172
Performance of Heat Pump Dryer for Kaffir Lime Leaves and Quality of Dried Products under Different Temperatures and Media

Authors: N. Poomsa-ad, K. Deejing, L. Wiset

Abstract:

This research is to study the performance of heat pump dryer for drying of kaffir lime leaves under different media and to compare the color values and essential oil content of final products after drying. In the experiments, kaffir lime leaves were dried in the closed-loop system at drying temperatures of 40, 50 and 60 oC. The drying media used in this study were hot air, CO2 and N2 gases. The velocity of drying media in the drying chamber was 0.4 m/s with bypass ratio of 30%. The initial moisture content of kaffir lime leaves was approximately 180-190 % d.b. It was dried until down to a final moisture content of 10% d.b. From the experiments, the results showed that drying rate, the coefficient of performance (COP) and specific energy consumption (SEC) depended on drying temperature. While drying media did not affect on drying rate. The time for kaffir lime leaves drying at 40, 50 and 60 oC was 10, 5 and 3 hours, respectively. The performance of the heat pump system decreased with drying temperature in the range of 2.20-3.51. In the aspect of final product color, the greenness and overall color had a great change under drying temperature at 60 oC rather than drying at 40 and 50 oC. When compared among drying media, the greenness and overall color of product dried with hot air at 60 oC had a great change rather than dried with CO2 and N2.

Keywords: airless drying, drying rate, essential oil content

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1078881

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1774

References:


[1] G. Vázquez, F. Chemo, R. Moreria, and E. Cruz "Grape Drying in a Pilot Plant With a Heat Pump," Drying Technology-An International Journal, vol. 15 (3&4), pp. 899-920, 1997.
[2] S.Prasertsan, and P. Saen-saby, "Heat pump drying of agricultural materials," Drying Technology-An International Journal, vol. 16 (1&2), pp. 235-250, 1998.
[3] U. Teeboonma, J. Tiansuwan and S. Soponronnarit "Optimization of heat pump fruit dryers," Journal of Food Engineering, vol.59 (4), pp. 369-377, 2003.
[4] C. O. Perera and M. S. Rahman. "Heat pump dehumidifier drying of food," Trends in Food Science & Technology, vol. 8, pp. 75-79, 1997.
[5] M. B. O-Neill, M. S. Rahman, C. O. Perera, B. Smith, and L. D. Melton, "Colour and density of apple cubes dried in air and modified atmosphere," International Journal of Food Properties, vol. 1 (3), pp. 197-205, 1998.
[6] M. N. A. Hawlader,., C. O. Perera, and M. Tian, "Properties of modified atmosphere heat pump dried foods," Journal of Food Engineering, vol. 47 (4), pp. 387-402, 2006.
[7] A. Arabhosseini, W. Huisman, A. van Boxtel, and J. Muller, "Long-term effects of drying conditions on the essential oil and color of tarragon leaves during storage," Journal of Food Engineering, vol. 79 (2), pp. 561-566, 2007.
[8] O. T.Asekun, D. S. Grierson, and A. J. Afolayan, "Effects of drying methods on the quality and quantity of the essential oil of Mentha longifolia L. subsp.Capensis," Food Chemistry, vol. 101 (3), pp. 995- 998, 2007.