Solar drying - an effective means of food preservation

Esper, A.; Mühlbauer, Werner

doi:10.1016/s0960-1481(98)00143-8

Cited by 125 publications

(53 citation statements)

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“…The rate of beta-carotene retention varies with produce type, but the retention range for solar dried vegetables is reported to be 50-80% [2]. Drying in an appropriate solar drier leads to considerable reduction of drying time by up to 50% and a significant improvement in product quality in terms of color, texture, flavor, and nutrient retention [13][14][15][16]. For vegetables, the dehydration process affects, to varying degrees, the quality attributes of color, texture, and nutrient retention [1,15,[17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Physical Quality and Carotene Content of Solar-Dried Green Leafy and Yellow Succulent Vegetables

Mdziniso

Hinds

Bellmer

et al. 2006

Plant Foods Hum Nutr

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The effects of vegetable type, vegetable dimensions, and solar drier load on dehydration rate; and texture, color, water activity, and carotene content of solar-dried carrots, sweet potatoes, and collard greens were studied. Mean dehydration rates (moisture loss,%/hr) for solar dried loads of 430 g/m2 and 715 g/m2 were 3.3 +/- 0.30% and 3.8 +/- 0.20% for carrots and sweet potatoes, respectively. Loads of 360 g/m2 and 465 g/m2 of collard greens had dehydration rates of 6.3 +/- 0.10% moisture loss per hr. The results showed that vegetable type accounted for significant differences (p < 0.01) in dehydration rate, and beta-carotene content. Vegetable dimensions affected (p < 0.05) water activity. Solar drier load affected water activity (p < 0.01), and hue angle (p < 0.05). Beta-carotene contents (dry basis) of dehydrated carrot, sweet potato, and collard treatments were 10.9-17.4%, 7.6-9.8%, and 11.9-21.5%, respectively. Among the carrot treatments, the 5-mm thick slices packed at a load of 715 g/m2 contained the highest beta-carotene (17.4%, dry basis) and vitamin A activity (362 IU/g, dry basis), and good physical properties. For collard greens, the 2-cm and 3-cm wide strips packed at 360 g/m2 loads had the best combinations of high beta-carotene (21.5% and 17.2%, dry basis, respectively), vitamin A activity (357.2 and 293.1 IU/g, dry basis, respectively), and optimal color, texture, and water activity. Beta-carotene losses due to solar dehydration were 48.9-67.5%, 4.0-5.8%, and 1.9-19.8% (dry basis) in carrots, sweet potato and collard greens, respectively.

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Section: Introductionmentioning

confidence: 99%

Physical Quality and Carotene Content of Solar-Dried Green Leafy and Yellow Succulent Vegetables

Mdziniso

Hinds

Bellmer

et al. 2006

Plant Foods Hum Nutr

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“…The use of solar technology has been often suggested for the dried fruit industry for both reasons of reducing the energy cost and economically speeding the drying process to improve the final product quality in the terms of color and flavor. ing can be an effective means of food preservation since the product is completely protected during drying against rain, dust, insects and animals [14]. Significant developments, during the past decade, in the area of solar crop drying were reviewed by [15], stating the fact that solar energy is considered more applicable to low-temperature in-storage drying systems and it has gained more importance work to facilitate a comparison of the financial feasibility of solar drying as against open sun drying, having presented the results of some exemplifying calculations and a brief discussion.…”

Section: Introductionmentioning

confidence: 99%

Design of Fruits Solar Energy Dryer under Climatic Condition in Jordan

Al-Busoul¹

2017

JPEE

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In this paper, a new design of a natural convection solar dryer used to dry fruits is presented; taking into account the local climatic conditions prevailed in Jordan during summer season. The dryer will have a capacity of 100 kg of sliced apples and the simulation is based on mass and heat balances. It is deemed that such new design will be able to reduce the original moisture content, of the final product, to 10% within two days. The special tailored program could be used to calculate drying parameters for similar products under different climatic conditions. The next step will be focused on constructing the solar dryer in order to conduct actual experiments in the field.

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“…One of the most viable solutions for the population-food imbalance is to reduce the food losses drastically, which occur throughout the food production, harvest, postharvest and marketing [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of PVT Mixed Mode Dryer with Load Condition

Tiwari¹

2017

J Fundam Renewable Energy Appl

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In this communication, an attempt has been made to evaluate the performance of mixed mode dryer consists of PVT air collectors and wooden made drying chamber with load condition. Based on energy balances of PVT air collectors and conventional collector, an expression for outlet air temperature of PVT air collector has been derived. Further by using the rate of thermal energy available from PVT air collector, an analytical expression for crop temperatures has also been derived in terms of design and climatic parameters of New Delhi and experimentally validated. The validation of analytical model has been carried out for cauliflower with thin layer drying for last day of drying with reasonable assumptions. It has been observed that the drying time for a half kilogram of cauliflower is achieved in 21 hours due to larger size of the samples. The annual overall thermal energy and exergy were 396.48 kWh and 46.52 kWh respectively. The energy payback time (EPBT) was increased from 3.17 years on thermal energy basis to 27.03 years on exergy basis for mixed mode dryer. The energy production factor and life cycle conversion efficiency were found to be smaller on exergy basis compared to thermal energy basis. For a life time of 30 year the carbon credits earned on overall thermal energy basis was $ 727.9 and on overall exergy basis it was $ 85.5.

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Solar drying - an effective means of food preservation

Cited by 125 publications

References 1 publication

Physical Quality and Carotene Content of Solar-Dried Green Leafy and Yellow Succulent Vegetables

Physical Quality and Carotene Content of Solar-Dried Green Leafy and Yellow Succulent Vegetables

Design of Fruits Solar Energy Dryer under Climatic Condition in Jordan

Performance Evaluation of PVT Mixed Mode Dryer with Load Condition

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