Experimental investigation of an indirect type natural convection solar dryer

El-Sebaii, A.A.; Aboul-Enein, S.; Ramadan, M.R.I.; El-Gohary, H.G.

doi:10.1016/s0196-8904(01)00152-2

Cited by 181 publications

(73 citation statements)

References 12 publications

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“…They found that the drying process would continue at night when a thermal mass was used. El-Sebaii et al (2002) developed a solar dryer with a thermal storage system.The dryer was tested with and without thermal storage. They found that the storage material reduced the drying period.…”

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confidence: 99%

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Solar dryer with thermal storage and biomass-backup heater

Madhlopa

Ngwalo²

2007

Solar Energy

142

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The Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. Madhlopa, A. and Ngwalo, G. (2007) Solar dryer with thermal storage and biomass backup heater. Solar Energy, 81 (4). pp. 449-462. ISSN 0038-092Xhttp://strathprints.strath.ac.uk/16428/ This is an author produced version of a paper published in Solar Energy, 81 (4). pp. 449-462. ISSN 0038-092X. This version has been peer-reviewed but does not include the final publisher proof corrections, published layout or pagination.Strathprints is designed to allow users to access the research output of the University of Strathclyde. Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (http://strathprints.strath.ac.uk) and the content of this paper for research or study, educational, or not-for-profit purposes without prior permission or charge. You may freely distribute the url (http://strathprints.strath.ac.uk) of the Strathprints website.Any correspondence concerning this service should be sent to The Strathprints Administrator: eprints@cis.strath. AbstractAn indirect type natural convection solar dryer with integrated collector-storage solar and biomass backup heaters has been designed, constructed and evaluated. The major components of the dryer are biomass burner (with a rectangular duct and flue gas chimney), collector-storage thermal mass and drying chamber (with a conventional solar chimney).The thermal mass was placed in the top part of the biomass burner enclosure. The dryer was fabricated using simple materials, tools and skills, and it was tested in three modes of operation (solar, biomass and solar-biomass) by drying twelve batches of fresh pineapple (Ananas comosus), with each batch weighing about 20 kg. Meteorological conditions were monitored during the dehydration process. Moisture and vitamin C contents were determined in both fresh and dried samples. Results show that the thermal mass was capable of storing part of the absorbed solar energy and heat from the burner. It was possible to dry a batch of pineapples using solar energy only on clear days. Drying proceeded successfully even under unfavorable weather conditions in the solar-biomass mode of operation. In this operational mode, the dryer reduced the moisture content of pineapple slices from about 669 to 11% (db) and yielded a nutritious dried product. The average values of the final-day moisture-pickup efficiency were 15, 11 and 13 % in the solar, biomass and solar-biomass modes of operation respectively. It appears that the solar dryer is suitable for preservation of pineapples and other fresh food...

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confidence: 99%

“…They found that the drying process would continue at night when a thermal mass was used. El-Sebaii et al (2002) developed a solar dryer with a thermal storage system.…”

mentioning

confidence: 99%

Solar dryer with thermal storage and biomass-backup heater

Madhlopa

Ngwalo²

2007

Solar Energy

142

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“…One of these technologies is to use solar energy. Researches of solar energy have been carried out during the last decade including solar dryers (Basunia and Abe, 2001;El-Sebaii et al, 2002;Midilli and Kucuk, 2003). Energy conversion systems based on solar thermal technologies appeared to be cost effective compared to petroleum oil.…”

Section: Introductionmentioning

confidence: 99%

A Study for the Use of Solar Energy for Agricultural Industry - Solar Drying System Using Evacuated Tubular Solar Collector and Auxiliary Heater -

Lee¹

2013

Journal of Biosystems Engineering

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Purpose:The objectives of this study were to construct the solar drying system with evacuated tubular solar collector and to investigate its performance in comparison with indoor and outdoor dryings. Methods: Solar drying system was constructed with using CPC (compound parabolic concentrator) evacuated tubular solar collector. Solar drying system is mainly composed of evacuated tubular solar collector with CPC reflector, storage tank, water-to-air heat exchanger, auxiliary heater, and drying chamber. Performance test of solar drying system was conducted with drying of agricultural products such as sliced radish, potato, carrot, and oyster mushroom. Drying characteristics of agricultural products in solar drying system were compared with those of indoor and outdoor ones. Results: Solar drying system showed considerable effect on reducing the half drying time for all drying samples. However, outdoor drying was more effective than indoor drying on shortening the half drying time for all of drying samples. Solar drying system and outdoor drying for oyster mushroom showed the same half drying time. Conclusions: Oyster mushroom could be dried easily under outdoor drying until MR (Moisture Ratio) was reached to about 0.2. However, solar drying system showed great effect on drying for most samples compared with indoor and outdoor dryings, when MR was less than 0.5.

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“…As mentioned Jensen [12] In Ghana in January 2000 that the incident solar radiation intensity on the sloped surface of 30 deg., when daylight hours are 9, 10, 12, 14, 16 300, 600, 820, 670 and 500 W/m 2 respectively. Sebaii [13] in Egypt, are explained that the intensity of solar radiation on 4 August 2000 is reached to 1010 W/m 2 at midday, then decreased to 300 W/m 2 at four o'clock pm. [14 and 15] were confirmed that the incident solar radiation intensity on inclined surfaces was increased with increasing daylight hours and up to a maximum at midday then decreased thereafter.…”

Section: Introductionmentioning

confidence: 99%

A theoretical and practical study for the incident solar radiation intensity in the Basrah province (south of Iraq)

Al‐Hilphy¹

2013

IOSRJEN

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-A theoretical and practical study was conducted to the incident solar radiation intensity on a horizontal surface and another making an angle 30 o with the horizontal at Basra province, Iraq, during the years 2006 and 2011. The results showed that the intensity of solar radiation increased significantly (p<0.05) as daylight hours increasing reaching a maximum value of 740 `W/m 2 at midday and then decreased after that. This was found to be the trend throughout all months of the two years of our investigation. The intensity of solar radiation varied from one month to another. In addition, the solar radiation falling on the inclined surface is higher than that falling on a horizontal surface. The study also found that there was a significant difference in the intensity of solar radiation between 2006 and 2011. Empirical equations of the fourth order were developed to predict the incident solar radiation on a horizontal, as well as another inclined surface in the Basra province (south of Iraq)

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Experimental investigation of an indirect type natural convection solar dryer

Cited by 181 publications

References 12 publications

Solar dryer with thermal storage and biomass-backup heater

Solar dryer with thermal storage and biomass-backup heater

A Study for the Use of Solar Energy for Agricultural Industry - Solar Drying System Using Evacuated Tubular Solar Collector and Auxiliary Heater -

A theoretical and practical study for the incident solar radiation intensity in the Basrah province (south of Iraq)

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