A solar air heater with composite-absorber systems for food dehydration

A. Madhlopa, S.A. Jones, J.D.K. Saka

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

Development of appropriate technologies for conversion of solar radiation to thermal energy is essential for food preservation. A solar air heater, comprising two absorber systems in a single flat-plate collector, was designed on the principles of psychrometry. The heater was integrated to a drying chamber for food dehydration. This collector design offered flexibility in manual adjustment of the thermal characteristics of the solar dryer. The performance of the dryer was evaluated by drying fresh samples of mango (Mangifera indicus). Both fresh and dried mango samples were analysed for moisture content (MC), pH and ascorbic acid. During the dehydration period, meteorological measurements were made. The air heater converted up to 21.3% of solar radiation to thermal power, and raised the temperature of the drying air from about 31.7 °C to 40.1 °C around noon. The dryer reduced the MC of sliced fresh mangoes from about 85% (w/w) to 13% (w/w) on wet basis, and retained 74% of ascorbic acid. It was found that the dryer was suitable for preservation of mangoes and other fresh foods.
LanguageEnglish
Pages27-37
Number of pages10
JournalRenewable Energy
Volume27
Issue number1
DOIs
Publication statusPublished - Sep 2002

Fingerprint

Dehydration
Drying
Ascorbic acid
Solar radiation
Composite materials
Moisture
Food preservation
Air
Solar dryers
Thermal energy
Temperature
Hot Temperature

Keywords

  • solar air heater
  • composite-absorber systems
  • food dehydration
  • psychrometry

Cite this

Madhlopa, A. ; Jones, S.A. ; Saka, J.D.K. / A solar air heater with composite-absorber systems for food dehydration. In: Renewable Energy. 2002 ; Vol. 27, No. 1. pp. 27-37.
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abstract = "Development of appropriate technologies for conversion of solar radiation to thermal energy is essential for food preservation. A solar air heater, comprising two absorber systems in a single flat-plate collector, was designed on the principles of psychrometry. The heater was integrated to a drying chamber for food dehydration. This collector design offered flexibility in manual adjustment of the thermal characteristics of the solar dryer. The performance of the dryer was evaluated by drying fresh samples of mango (Mangifera indicus). Both fresh and dried mango samples were analysed for moisture content (MC), pH and ascorbic acid. During the dehydration period, meteorological measurements were made. The air heater converted up to 21.3{\%} of solar radiation to thermal power, and raised the temperature of the drying air from about 31.7 °C to 40.1 °C around noon. The dryer reduced the MC of sliced fresh mangoes from about 85{\%} (w/w) to 13{\%} (w/w) on wet basis, and retained 74{\%} of ascorbic acid. It was found that the dryer was suitable for preservation of mangoes and other fresh foods.",
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A solar air heater with composite-absorber systems for food dehydration. / Madhlopa, A.; Jones, S.A.; Saka, J.D.K.

In: Renewable Energy, Vol. 27, No. 1, 09.2002, p. 27-37.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A solar air heater with composite-absorber systems for food dehydration

AU - Madhlopa, A.

AU - Jones, S.A.

AU - Saka, J.D.K.

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N2 - Development of appropriate technologies for conversion of solar radiation to thermal energy is essential for food preservation. A solar air heater, comprising two absorber systems in a single flat-plate collector, was designed on the principles of psychrometry. The heater was integrated to a drying chamber for food dehydration. This collector design offered flexibility in manual adjustment of the thermal characteristics of the solar dryer. The performance of the dryer was evaluated by drying fresh samples of mango (Mangifera indicus). Both fresh and dried mango samples were analysed for moisture content (MC), pH and ascorbic acid. During the dehydration period, meteorological measurements were made. The air heater converted up to 21.3% of solar radiation to thermal power, and raised the temperature of the drying air from about 31.7 °C to 40.1 °C around noon. The dryer reduced the MC of sliced fresh mangoes from about 85% (w/w) to 13% (w/w) on wet basis, and retained 74% of ascorbic acid. It was found that the dryer was suitable for preservation of mangoes and other fresh foods.

AB - Development of appropriate technologies for conversion of solar radiation to thermal energy is essential for food preservation. A solar air heater, comprising two absorber systems in a single flat-plate collector, was designed on the principles of psychrometry. The heater was integrated to a drying chamber for food dehydration. This collector design offered flexibility in manual adjustment of the thermal characteristics of the solar dryer. The performance of the dryer was evaluated by drying fresh samples of mango (Mangifera indicus). Both fresh and dried mango samples were analysed for moisture content (MC), pH and ascorbic acid. During the dehydration period, meteorological measurements were made. The air heater converted up to 21.3% of solar radiation to thermal power, and raised the temperature of the drying air from about 31.7 °C to 40.1 °C around noon. The dryer reduced the MC of sliced fresh mangoes from about 85% (w/w) to 13% (w/w) on wet basis, and retained 74% of ascorbic acid. It was found that the dryer was suitable for preservation of mangoes and other fresh foods.

KW - solar air heater

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