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

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Fadhel - Recent Advancements in Solar Drying Figure 6.4. Photo of an indirect active hybrid solar–electrical dryer(Boughali et al., 2009). An experimental tests with and without load were performed in winter season in order to study the thermal behavior of the dryer and the effect of high air mass flow on the collector and system drying efficiency. The fraction of electrical and solar energy contribution versus air mass flow rate was investigated. Slice tomato was studied with different temperatures and velocities of drying air in order to study the influence of these parameters on the removal moisture content from the product and on the kinetics drying and also to determine their suitable values. Many different thin layer mathematical drying models were compared. Table 6.3 displays the fraction of electrical and solar energy used in dryer process. It was noticed that when airflow rates of the drying air increased from 0.0405 kg/m 2 s (1 m s- 1 ) to 0.0810 kg/m 2 s (2ms- 1 ) the percent energy contribution by the solar air heater decreased from 25.074% to 13.22% while that of auxiliary heater increased from 74.92% to 86.78%. This increase in contribution of the auxiliary heater is due in fact to the collector outlet temperature of the air drying which will be decreased significantly in high airflow rates and hence the air drying will be required to be heated by the auxiliary heater by larger temperature difference. From the energy point of view it is preferable in drying operation to use low airflow rate which has a fraction of solar energy used greater than other air flow(Boughali et al., 2009). Table 6.3. Energy contribution of solar collector, electrical heater and blower for the hybrid dryer (Boughali et al., 2009) 132 Drying of Foods, Vegetables and Fruits
Fadhel - Recent Advancements in Solar Drying 6.3.3 Solar dryer system with swirling flow Gülsah and Cengiz (2009) designed a new solar dryer system with swirling flow for drying seeded grape. The Schematic diagram of the system is shown in Figure 6.5. Figure 6.5. Schematical view of designed experiment set (Gülsah and Cengiz, 2009) A swirl element was installed in the entrance of the chamber to give rotation effect to the air (Figure 6.6). Also 32 pieces of bended sheet strips with dimensions 21 x 5 x 3 mm were installed inside the chamber so as to direct the air flow (Figure 6.7). Figure 6.6. The swirl element with triangle arranged and 60° angle (Gülsah and Cengiz, 2009) Drying of Foods, Vegetables and Fruits 133
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Solar Drying:Fundamentals,Applicati
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Solar Drying: Fundamentals, Applica
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PREFACE Drying using solar radiatio
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Index Chapter No Title / Authors Pa
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Visavale - Principles, Classificati
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Table 1.4. Quality and other drying
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It was seen that for all fish, hot
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Jangam, Hii, C.L.; S.V. Law, and C.
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