Experimental Investigation of a Heat Pump Assisted Fluidized Bed Dryer

Gokul G Nair, M A College of engineering, Kothamangalam; Dr. Jeoju M Issac , M A College of engineering, Kothamangalam; Nidhin A R , M A College of engineering, Kothamangalam; Binu Varghese , M A College of engineering, Kothamangalam; Swagath v mohan , M A College of engineering, Kothamangalam

Heat Pump, Fluidized Bed Dryer, Drying Time, Relative Humidity, Drying Curve

The drying or dehydration is the controlled heating of food products to evaporate quantified amount of moisture that is originally present in it. Drying of food products is essential to enhance the shelf life of the product without quality losses over an extended period of time. It is an energy intensive process. The fluidized bed dryer with heat pump is one of the efficient method to reduce the energy. This project presents the design of fluidized bed dryer with heat pump. Drying was carried out in three different temperatures 50, 55 and 60°C. Comparisons of all three cases were made and it was found that inlet air temperature is the main parameter that affect the drying time. The drying time is decreases as the inlet temperature increases.
    [1] R.E. Bahu,”Energy consumption in dryer design”, Drying, Elsevier, 1991, pp.553-557. [2] K. J. Chua, S. K. Chou, J. C. Ho, M. N. A. Hawlader, “Heat Pump drying: Recent Developments and Future Trends”, Drying Technology, 2002, pp. 1579-1610. [3] P.K. Adapa, G.J. Schoenau, and S. Sokhansanj,” Performance Study of a Heat Pump Dryer System for Specialty Crops – Part 2: Model Verification”. International Journal of Energy Research, 2002, pp. 1-13. [4] ASHRAE, “ASHRAE Handbook - Fundamentals. American Society of Heating, Refrigerating and Air-Conditioning Engineers”, Inc., Atlanta, GA. [5] U.S. Pal, and M.K. Khan, “Performance Evaluation of Heat Pump Dryer”, Journal Food Science Technology, 2010, pp.230-234. [6] Tai K. W., Zyalla It, Devotta S., Diggory P. J., Watson F. A. and Holland F. A. “The potential for heat pump in drying and dehumidification systems II: An experimental assessment of the dehumidification characteristics of a heat pump dehumidification system using RI 14”, Energy Research, I982a,, pp.323-331. [7] Tai K. W., Zyalla R., Devotta S., Diggory P. J., Watson F. A. and Holland F. A., “ The potential for heat pump in drying and dehumidification systems III An experimental assessment of the dehumidification characteristics of a heat pump dehumidification system using R114”, Energy Research, 1982b, pp.333-340. [8] Palancz, B.,”Mathematical model for continuous fluidized bed drying”. Chem Eng. 1983, pp.1045-1059. [9] Thakur A. K and Gupta A. K.,” Fluidized Bed Drying of High Moisture Paddy in Two Stages”. Journal of Agricultural Engineering, 2007, 44(3). [10] Jingsheng Ye; Qiaojun Luo; Xiaolan Li; Qing Xu; and Zhanyong Li, "Sorption Drying of Soybean Seeds with Silica Gel in a Fluidized Bed Dryer," International Journal of Food Engineering: 2008,Vol. 4: Iss. 6, Article 3. Journal of Food Science, 52(5), 1358-1363. [11] Murthy Z. V. P. and Joshi Dhruv, 2007. Fluidized Bed Drying of Aonla (Emblica officinalis). Drying Technology, 25, pp. 883 – 889.
Paper ID: GRDJEV02I060062
Published in: Volume : 2, Issue : 6
Publication Date: 2017-06-01
Page(s): 124 - 129