dryer, to maintain uniform and hygienic drying conditions and to reduce drying times. The systems were constituted of three parts: air blow region (fan), air heater region (solar collector) and drying region (rotary chamber)
2.3. Solar dryers with heat storage media
Several workers have explored different techniques for accelerating the solar drying of various agricultural products by considering the possible use of thermal storage materials, and developed drying models to predict the drying curves of the dried materials [28-33]. A review article of the solar drying systems incorporating with phase change materials (PCM) for drying agricultural food products was recently presented by Bal et al. [33] Tiwari et al. [28,29] experimentally e a crop dryer-cum eater and crop dryer rock bed storage. They reported that the energy balance equations for each component of the system have been used to predict the analytical results. On the basis of the analytical results, it was observed that the drying time is significantly reduced on using the water and the rock best as storage media. The system can be used to provide hot water in case the drying system is not in operation. The water heater below the air heater systems will act as a storage material for drying the crop during off-sunshine Comparative performance of coriander dryer coupled to solar air heater and solar air heater-cum rock bed storage was studied by Chauhan et al. [30]. They concluded that the average moisture content of the grains in the grain bed can be reduced from hour. 28.2%(db) to 11.4%(db) in 27 cumulative sunshine hours (i.e. 3 sunshine days) by using the solar air heater only; whereas, by using the solar air heater during sunshine hours and the rock bed energy storage during off sunshine hours the same amount of moisture can be evaporated in 31 cumulative hours (18 sunshine and 13 off sunshine hours). During sunshine drying, the effect of grain bed depths on drying performance of coriander was observed to be remarkable, while the air mass velocity has no significant effect on the moisture content reduction rate. However, off-sunshine drying time can be reduced by 1 h for each increment of 50 (kg/hm2) in air mass velocity Hence, the heat stored in the rock bed can be used effectively for heating the inlet (ambient) air for off-sunshine drying of agricultural products. Jain and Jain [31] and Jain [32] modeled the system performance of multi-tray crop drying using an inclined multi-pass solar air heater with built-in thermal storage. They concluded that the proposed mathematical model is useful for evaluating the thermal
เครื่องเป่า เพื่อรักษาสภาพแห้งเหมือนกัน และถูกสุขอนามัย และลดแห้งเวลา ระบบถูก constituted สามส่วน: อากาศเขตเป่า (พัดลม), ภูมิภาคอากาศอุ่น (แสงอาทิตย์) และเขตอบ (ห้องโรตารี่) 2.3. อาทิตย์อบ ด้วยสื่อที่เก็บความร้อน Several workers have explored different techniques for accelerating the solar drying of various agricultural products by considering the possible use of thermal storage materials, and developed drying models to predict the drying curves of the dried materials [28-33]. A review article of the solar drying systems incorporating with phase change materials (PCM) for drying agricultural food products was recently presented by Bal et al. [33] Tiwari et al. [28,29] experimentally e a crop dryer-cum eater and crop dryer rock bed storage. They reported that the energy balance equations for each component of the system have been used to predict the analytical results. On the basis of the analytical results, it was observed that the drying time is significantly reduced on using the water and the rock best as storage media. The system can be used to provide hot water in case the drying system is not in operation. The water heater below the air heater systems will act as a storage material for drying the crop during off-sunshine Comparative performance of coriander dryer coupled to solar air heater and solar air heater-cum rock bed storage was studied by Chauhan et al. [30]. They concluded that the average moisture content of the grains in the grain bed can be reduced from hour. 28.2%(db) to 11.4%(db) in 27 cumulative sunshine hours (i.e. 3 sunshine days) by using the solar air heater only; whereas, by using the solar air heater during sunshine hours and the rock bed energy storage during off sunshine hours the same amount of moisture can be evaporated in 31 cumulative hours (18 sunshine and 13 off sunshine hours). During sunshine drying, the effect of grain bed depths on drying performance of coriander was observed to be remarkable, while the air mass velocity has no significant effect on the moisture content reduction rate. However, off-sunshine drying time can be reduced by 1 h for each increment of 50 (kg/hm2) in air mass velocity Hence, the heat stored in the rock bed can be used effectively for heating the inlet (ambient) air for off-sunshine drying of agricultural products. Jain and Jain [31] and Jain [32] modeled the system performance of multi-tray crop drying using an inclined multi-pass solar air heater with built-in thermal storage. They concluded that the proposed mathematical model is useful for evaluating the thermal
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