Convective Flat-plate Solar Heat Collector for Cauliflower Drying

Kadam, Dattatreya M.; Samuel, D. V. K.

doi:10.1016/j.biosystemseng.2005.11.012

Cited by 55 publications

(28 citation statements)

References 11 publications

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“…2 that the temperature difference inside and outside of the drier was low in the morning and evening periods as compared to afternoon, when temperature difference was high. Similar trends were observed for RH difference, which contradicts Kadam and Samuel (2006) and similar to the results stated by Shahi Navin et al (2009). The reason for this contradiction is that the PSD contains an exhaust fan at the top of the north wall which removes excess humid air inside the chamber.…”

Section: Economic Evaluationsupporting

confidence: 84%

“…The reason for this contradiction is that the PSD contains an exhaust fan at the top of the north wall which removes excess humid air inside the chamber. The increases in ambient air temperature as well as decrease in the RH inside and outside of PSD are directly affected by solar radiation (Kadam and Samuel 2006). The inside and outside RH were inversely proportional to solar radiation.…”

Section: Economic Evaluationmentioning

confidence: 96%

“…They also found favourable results regarding better qualities like cleanliness and texture of dried products. Open sun drying has a profitable activity, but it has some associated problems like damage due to rain, insect, dust and dirt contamination (Kadam and Samuel, 2006). This results not only in deterioration in quality of produce but also affects appearance, nutrient quality and shelf life adversely (Dwivedi et al 2003).…”

Section: Introductionmentioning

confidence: 99%

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Development of polyhouse type solar dryer for Kashmir valley

et al. 2011

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Polyhouse type solar dryer (PSD) consist of drying chamber, drying trays and exhaust fan was developed for drying fruits and vegetables. The relative humidity (RH) inside the PSD varied in between 21 to 74% as compared to outside RH which ranged from 40 to 75%. The performance was found suitable and resulted in efficient drying at low RH. The thermal performance test for PSD under full and no load testing conditions were calculated. The temperature inside the dryer was 62 to 76% higher than the ambient conditions. PSD was helpful in reducing the drying ranging from 33 to 53%. The capacity of PSD was 100-150 kg per batch. The economic cost of solar dryer was compared with mechanical drying for beneficial to local producer. The cost of PSD Rs 80,000 could recover within the period of 1.5 years by adopting solar drying technology.

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Section: Economic Evaluationsupporting

confidence: 84%

Section: Economic Evaluationmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Development of polyhouse type solar dryer for Kashmir valley

et al. 2011

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“…The selection of proper drying condition is of prime importance for reduced thermal stress and to retain the key compounds in the rehydrated product. A number of scientists including Shukla and Sigh (2006), Jadhav et al (2005), (Kadam and Samule 2006) have reported drying mechanism of cauliflower, but optimum conditions are required to be accessed as per desired characteristics in the dried product. The presented manuscript discusses not only about drying mechanism of cauliflower under hot air convective drying, but also about optimization of drying conditions and initial size of raw cauliflower depending upon drying time and quality attributes of the final product.…”

Section: Introductionmentioning

confidence: 99%

Optimization of drying process parameters for cauliflower drying

2011

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The different sizes (3, 4 and 5 cm) of hybrid variety of cauliflower (variety no. 71) were dehydrated in thin layer at three temperatures of 55, 60 and 65°C with velocities of 40, 50 and 60 m/min. Dehydrated samples were analyzed for vitamin C, rehydration ratio and browning. Statistical analysis indicated that drying time was dependent on initial size of cauliflower, drying air temperature and velocity, but rehydration ratio was significantly affected by the combined effect of temperature and airflow velocity. Vitamin C content of the dried cauliflower samples were significantly affected by temperature only and non enzymatic browning was function of temperature, airflow velocity, and combined effect of temperature and airflow velocity. Optimization of the drying process parameters for the given constraints resulted in 60.10 0 C, 59.28 m/min, 3.35 cm. The predicted responses for the optimized combination of process parameters were time, vitamin C content, rehydration ratio, and browning values of 491.22 min (time), 289.86 mg/100 g (Vitamin C), 6.91 ( rehydration ratio), and 0.14 (browning), respectively with the desirability factor of 0.787.

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“…According to facts and figures, about 10-15% of energy is consumed by the drying industry in Canada, the United States, France, and England, and about 20-25% in Denmark and Germany [6]. Provided that drying is an energy-intensive process which consumes the highest share of energy compared to other processes involved in crop production, therefore it is essential to apply cheaper energies for this process [7,8]. Using direct sunlight for drying has several downsides including contamination, dust, pest, and bird attacks, as well as rainfall.…”

Section: Introductionmentioning

confidence: 99%

An Investigation of Energy Consumption, Solar Fraction and Hybrid Photovoltaic–Thermal Solar Dryer Parameters in Drying of Chamomile Flower

Minaei¹,

Ghobadian²,

Banakar³

et al. 2014

International Journal of Food Engineering

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In this research, drying of a medicinal plant (chamomile) in a hybrid photovoltaic-thermal solar dryer with and without heat pump was investigated. The experiments were performed at three air speeds (0.5, 1, and 1.5 m/s), three levels of air temperature (40, 50, and 60°C), with and without using a heat pump. Results of analysis indicated that adding a heat pump to the photovoltaic solar dryer decreases drying time, energy consumption, and required specific energy. Solar energy fraction increased with decreasing air temperature and velocity. Analysis of the dryer-related parameters showed that the maximum and minimum thermal efficiencies were 33.8 and 16.4%, respectively, both in the no-heat-pump mode while with the heat pump, its maximum and minimum values were 38.4 and 19.7%, respectively. Moreover, the highest and lowest electrical efficiencies for the no-heat-pump mode were 13.4 and 9.1%, respectively; while using the heat pump, its maximum and minimum values were 14.1 and 10.4%, respectively. Results of analyzing the dryer's coefficient of performance for drying chamomile showed that the highest and lowest coefficients of performance were 3.41 and 1.82, respectively. Eleven mathematical models were tested, and Page's model was selected as the best for describing the drying behavior of chamomile flower.

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Convective Flat-plate Solar Heat Collector for Cauliflower Drying

Cited by 55 publications

References 11 publications

Development of polyhouse type solar dryer for Kashmir valley

Development of polyhouse type solar dryer for Kashmir valley

Optimization of drying process parameters for cauliflower drying

An Investigation of Energy Consumption, Solar Fraction and Hybrid Photovoltaic–Thermal Solar Dryer Parameters in Drying of Chamomile Flower

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