Estudo das viabilidades térmica e econômica de um secador solar de exposição direta fabricado com materiais de baixo custo
A study of the thermal and economic viability of the direct exposure solar dryer manufactured with low cost materials, using 1900g of apple (Malus Domestica) is presented. The solar dryer works with natural air circulation and stands out for its low cost and ease of operation and maintenance. The...
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| Natura: | Dissertação |
| Lingua: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Accesso online: | https://repositorio.ufrn.br/handle/123456789/52607 |
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| Riassunto: | A study of the thermal and economic viability of the direct exposure solar
dryer manufactured with low cost materials, using 1900g of apple (Malus
Domestica) is presented. The solar dryer works with natural air circulation and
stands out for its low cost and ease of operation and maintenance. The study stages
consisted of using a solar dryer in two configurations: Configuration 1 – without
thermal insulation and Configuration 2 – With thermal insulation, selection and
preparation of the raw material, analysis of drying throughout the dryer (3 samples,
located in the input, center and output in the two configurations of the solar dryer),
use of instruments for measuring data (solar radiation, air velocity, mass,
temperature and time), and analysis of the efficiency of the process. The results
were compared with other dryers and demonstrated the economic and thermal
viability of the studied solar dryer. Configuration 2 provided superior results
compared to Configuration 1. Thermal Efficiency of 10%, process efficiency,
91.65%, average instantaneous solar irradiance of 990 W/m^2 and total cost of
R$298.48. Furthermore, the moisture contents of the samples were adjusted to five
mathematical models commonly used in solar drying. To verify the goodness of fit,
the following statistical parameters were considered: coefficient of determination
(r^2), root mean square error (RSME) and chi-square (χ^2). Midilli and Kuçuk's
model showed adequate adjustment of the experimental data of samples A, B and
C in Configurations 1 and 2. In the end, the dehydrated apple slices had a
satisfactory texture and appearance and were crushed to produce flour. |
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