Solar Drying: Fundamentals,Applications and Innovations - National ...

More documents

Recommendations

Info

Fadhel - Recent Advancements in Solar Drying The performances of a new designed DPSD have been compared with those of a typical cabinet drier (CD) and a traditional open-air sun drying for drying of red chilli in central Vietnam. The DPSD resulted in the shortest drying time to meet desired moisture content of chilli (10% w.b.), which corresponds to the highest drying rate comparing to other methods. The DPSD showed higher performance compared to CD, which the overall drying efficiency was more than two times higher in case of DPSD compared to CD. All measured and calculated parameters for performance evaluation of DPSD compared to typical CD and traditional open-air sun drying are summarized in Table 6.2, (Banout et al., 2011). Table 6.2. Performance evaluation of DPSD compared to CD and traditional open-air sun drying (Banout et al. 2011) 6.3.2 Indirect active hybrid solar – Electrical dryer system Boughali et al. (2009) studied the indirect active hybrid solar –Electrical dryer in the eastern Algerian Septentrional Sahara. The indirect active hybrid solar–electrical dryer constructed and installed at LENREZA laboratory (laboratory of new and renewable energy in arid zones), university of Ouargla, Algeria. It consists mainly of a flat plate solar collector, drying chamber, electrical fan, resistance heater (3.75 kW: accuracy ± 2%) and a temperature controller. The solar air collector has an area of 2.45 m 2 , and was inclined at an angle of 31⁰ (latitude of Ouargla city) with the horizontal facing south all the time and used a painted matte black metal galvanized of 0.002 m thickness to absorb most of the incident solar radiation. The top losses were minimized by placing a glass cover of 0.005m thickness over the top of the metal galvanized sheet, and an insulation layer of polystyrene sandwiched between two parallel galvanized metal sheets was used as sides and back insulator. The air was drawn under the glass sheet, between the glass and the absorber. The solar collector was connected directly to the drying chamber 130 Drying of Foods, Vegetables and Fruits
Fadhel - Recent Advancements in Solar Drying without any air ducts. The drying cabinet fabricated with a galvanized iron box with insulated polystyrene walls of dimensions 1.65 x 0.60 x 1.00 m (height, width and depth) contains six product trays each tray has an area of 0.4 m 2 with possibilities to extend to eight product trays. The drying trays were made of a wooden frame on all four sides and a wire mesh on the bottom to uphold the samples and/or to change the position of the trays. The mass sample used in this experiment was 2 kg in each tray with airflow 0.0314, 0.0470 and 0.0628 m 3 /s. There was a distance of 0.12 m between trays in order to obtain uniform air circulation. The door of the dryer was properly sealed to prevent air leakage. In solar drying process, the auxiliary heater was used to adjust the drying air temperature. The preliminary heated drying air by solar radiation, arrived at the inlet of cabinet dryer was heated by electrical resistance if its temperature was less than consign temperature; which is controlled thermostatically and then aspired by an exhaust fan through the product to the environment. The exhaust fan of 20 cm diameter (model KFA30, power input 40 W, running at 1400 rpm and volumetric flow at 0.325 m 3 /s) was manually controlled by a valve, allowing the choice of the desired air mass flow. The fan was fixed below product trays at the bottom of the dryer to ensure an even distribution of air and evacuate the humidity of the product to the surrounding. The design and photo for the hybrid solar dryer are presented, respectively, in Figure 6.3 and Figure 6.4 (Boughali et al., 2009). Figure 6.3. Schematic diagram of an indirect active hybrid solar–electrical dryer (Boughali et al., 2009) Drying of Foods, Vegetables and Fruits 131
Page 1:
Solar Drying:Fundamentals,Applicati
Page 5 and 6:
Solar Drying: Fundamentals, Applica
Page 7:
PREFACE Drying using solar radiatio
Page 11:
Index Chapter No Title / Authors Pa
Page 14 and 15:
Visavale - Principles, Classificati
Page 16 and 17:
Page 18 and 19:
Page 20 and 21:
Page 22 and 23:
Page 24 and 25:
Page 26 and 27:
Page 28 and 29:
Page 30 and 31:
Page 32 and 33:
Page 34 and 35:
Page 36 and 37:
Page 38 and 39:
Page 40 and 41:
Page 42 and 43:
Page 44 and 45:
Page 46 and 47:
Page 48 and 49:
Page 50 and 51:
Table 1.4. Quality and other drying
Page 52 and 53:
It was seen that for all fish, hot
Page 54 and 55:
Page 56 and 57:
Page 58 and 59:
Page 60 and 61:
Page 62 and 63:
Page 64 and 65:
Aware and Thorat - Solar Drying of
Page 66 and 67:
Page 68 and 69:
Page 70 and 71:
Page 72 and 73:
Page 74 and 75:
Page 76 and 77:
Page 78 and 79:
Page 80 and 81:
Page 82 and 83:
Page 85 and 86:
Jangam, Hii, C.L.; S.V. Law, and C.
Page 87 and 88:
Hii and Law - Solar Drying of Major
Page 89 and 90:
Hii and Law - Solar Drying of Major
Page 91 and 92: Hii and Law - Solar Drying of Major
Page 107 and 108: Bala, Jangam, B.K.; S.V. Hossain, a
Page 109 and 110: Bala and Hossain - Solar Drying of
Page 123 and 124: Hii, Jangam, C.L., Ong, S.V. and S.
Page 125 and 126: Hii and Ong - Quality Characteristi
Page 135: Fadhel, Jangam, M.I., S.V. Recent a
Page 138 and 139: Fadhel - Recent Advancements in Sol
Page 164 and 165: 12. Thangvaravut, H., Chiewchan, N.
Page 166 and 167: 39. Nimmol, C., Devahastin, S. (201
Page 168 and 169: 69. Mujumdar, A. S., & Law, C. L. (
Page 170 and 171: 98. Chung, L. L., Waje, S. S., Thor
Page 172 and 173: 129. Qing-guo, H., Min, Z., Mujumda
Page 176: Solar Drying: Fundamentals, Applica
show all

Solar Drying: Fundamentals,Applications and Innovations - National ...

Create successful ePaper yourself

Delete template?

Save as template?