Research Papers

Design, Construction, and Analysis of a Passive Indirect Solar Dryer With Chimney

[+] Author and Article Information
Felipe Cichetto Tedesco, Alexandre José Bühler, Sérgio Wortmann

Federal Institute of Education,
Science and Technology of Rio Grande do Sul,
Farroupilha 95174-274, Brazil

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received May 18, 2018; final manuscript received November 3, 2018; published online November 30, 2018. Assoc. Editor: Ming Qu.

J. Sol. Energy Eng 141(3), 031015 (Nov 30, 2018) (9 pages) Paper No: SOL-18-1224; doi: 10.1115/1.4041931 History: Received May 18, 2018; Revised November 03, 2018

The growing demand for alternative technologies, of clean and sustainable nature, has fostered the development and improvement of equipment that uses solar energy for the dehydration of seeds and fruits. Such equipment has been used worldwide for hundreds of years; however, it remains uncommon in Serra Gaúcha, a region of great production of grapes and apples for natura consumption in the state of Rio Grande do Sul—Brazil. In order to investigate the economic and technical viability of solar dryers in the Serra Gaúcha, this work has as target the design, simulation, construction, and experimental analysis of an Indirect Passive Solar Dryer with Chimney. The prototype, divided into three parts: solar collector, dehydration chamber, and chimney, was built prioritizing materials of low cost, but that did not compromise its performance. The device was submitted to experiments, which observed: solar collector behavior very close to the simulated one; obtaining a coefficient of performance of 87% in the equipment; satisfactory rise in temperature at the collector outlet comparing to its inlet; and dehydration of apples with a reduction of 89% in mass with 32.78 MJ of energy delivered to the system. The prototype payback period was estimated in two years.

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Fig. 1

Simulation flowchart

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Fig. 2

(a) Passive indirect solar dryer with chimney and (b) indirect solar dryer with chimney—three main parts

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Fig. 3

Solar collector in (a) isometric view and (b) frontal view

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Fig. 8

Positioning of the temperature sensors

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Fig. 7

(a) Dimensions of the chimney and (b) indirect solar dryer

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Fig. 6

Dehydration chamber

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Fig. 5

Solar collector under construction: (a) detail of the thermal insulation region of the collector and (b) support for the collector absorber plate

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Fig. 4

Simulations of the solar collector: (a) flat area and opening and (b) irradiance and slope of the collector

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Fig. 9

Temperature rise in collector versus input power—simulation with η = 100%

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Fig. 10

Collector temperature rise versus input power—simulation with η = 87%

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Fig. 11

Errors of the trend curve of the experimental data with the simulated values: (a) absolute error and (b) relative error

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Fig. 12

Errors between the trend equation and the experimental data with η = 87%: (a) absolute error and (b) relative error

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Fig. 13

Percentage reduction of mass versus energy delivered

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Fig. 14

Behavior of the (a) temperature and (b) outside relative humidity for a day of apple dehydration

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Fig. 15

Payback time for the solar dryer



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