A Thermal Node Model for Predicting Heat Transfer in Mixed Type Solar Drying System

A solar air drying system including solar air collector, drying cabinet and air blower for notoginseng drying has been constructed and tested. Two identical air solar collectors with two air channels, V-groove absorption heat plates and a single glass cover have been employed. The results of test show that the solar air collectors can obtain a good thermal performance in winter season. When the air flow mass rate is fixed at 0.0597kg·s-1, the maximum values of thermal efficiency and outlet air temperature are 76.0% and 62.2°C, respectively. The experimental analysis between two sampling notoginseng drying suggests that the solar drying is very effective, and the drying time has been shorten to about 440 minutes from 990 minutes of the traditional drying by sun. It is also observed that using the solar drying system notoginseng has a higher quality than traditional drying method.

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Performance analysis of solar drying system using double pass solar air collector with finned absorber for drying copra

Contemporary Engineering Sciences ◽

10.12988/ces.2018.811 ◽

2018 ◽

Vol 11 (11) ◽

pp. 523-536 ◽

Cited By ~ 1

Author(s):

M. Yahya

Keyword(s):

Performance Analysis ◽

Solar Drying ◽

Double Pass ◽

Solar Air Collector ◽

Drying System

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Energy Analysis of the Direct and Indirect Solar Drying System

Solar Drying Technology - Green Energy and Technology ◽

10.1007/978-981-10-3833-4_19 ◽

2017 ◽

pp. 529-542

Author(s):

Om Prakash ◽

Anil Kumar ◽

Prashant Singh Chauhan ◽

Daniel I. Onwude

Keyword(s):

Energy Analysis ◽

Solar Drying ◽

Drying System

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Study on Sewage Sludge Drying System With Built-in Solar Drying Bed

E3S Web of Conferences ◽

10.1051/e3sconf/202123701041 ◽

2021 ◽

Vol 237 ◽

pp. 01041

Author(s):

Zhipan Gu ◽

Jichun Yang ◽

Jing Liu ◽

Leren Tao ◽

Ye Zhang ◽

...

Keyword(s):

Heat Transfer ◽

Sewage Sludge ◽

Radiation Heat Transfer ◽

Middle Layer ◽

Bottom Layer ◽

Mass Transfer Process ◽

Hot Water ◽

Solar Drying ◽

Hot Air ◽

Air Supply

In this paper, the renewable energy solar energy is used as the heat source. The combination of solar drying bed and traditional hot air drying can effectively reduce energy consumption and operation cost. The drying chamber is divided into three layers. The top air supply outlet supplies hot air, the middle layer places wet sludge, and the bottom layer uses hot water coil to dry the sludge. The whole drying process is a heat and mass transfer process with convective heat transfer and radiation heat transfer. After analysis and comparison with traditional energy drying, it is found that drying 97.5kg of sewage sludge will save 79% energy, save 12.84 kg of standard coal, reduce 32 kg of carbon dioxide and 1.284 kg of sulphur dioxide.

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