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

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Fadhel - Recent Advancements in Solar Drying Figure 6.10. Standard-type CHP unit (Ogura and Mujumdar, 2000) The drying chamber contains multiple trays to hold the drying material and expose it to the air flow. The general working of chemical heat pump in this study occurs in two stages: adsorption and desorption. The adsorption stage is the cold production stage, and this is followed by the regeneration stage, where decomposition takes place. During the production phase, the liquid–gas transformation of ammonia produces cold at low temperature in the evaporator. At the same time, chemical reaction between the gaseous ammonia and solid would release heat of reaction at higher temperature. The incoming air is heated by condensing refrigerant (ammonia) and enters the dryer inlet at the drying condition and performs drying. After the drying process, part of the moist air stream leaving the drying chamber is diverted through the evaporator, where it is cooled, and dehumidification takes place as heat is given up to the refrigerant (ammonia). The air is then passing through the condenser where it is reheated by the condensing refrigerant and then to the drying chamber (Fadhel et al., 2011). In this study the material dried is lemongrass. 138 Drying of Foods, Vegetables and Fruits
Fadhel - Recent Advancements in Solar Drying Figure 6.11. Schematic diagram of solar-assisted chemical heat-pump dryer (Ibrahim et al., 2009a) A series of experiments has been performed on the (SACHPD) system to evaluate the performance. The performance of the system has been investigated experimentally for different environment climate conditions. Two representative days for clear and cloudy conditions were presented (Ibrahim et al., 2009b). The maximum values of the solar fraction (SF) and the coefficient of performance of chemical heat pump (COP h ) of the system are 0.713 and 2 on a clear day, against the maximum values of 0.322 and 1.42 on a cloudy day. The total system energy output of 51 kWh and 25 kWh were obtained for clear and cloudy days, over 9 hours drying time. Figure 6.12 show the system solar fraction while Figure 6.13 shows the coefficient of performance of chemical heat pump. Figure 6.12. System solar fraction (Ibrahim et al., 2009b) Drying of Foods, Vegetables and Fruits 139
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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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Aware and Thorat - Solar Drying of
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Jangam, Hii, C.L.; S.V. Law, and C.
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Hii and Law - Solar Drying of Major
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