masterThesis
Viabilidade térmica e econômica de um forno solar tipo caixa fabricado a partir de elementos recicláveis em desuso
Fecha
2021-06-08Registro en:
PEREIRA NETO, Raimundo Vicente. Viabilidade térmica e econômica de um forno solar tipo caixa fabricado a partir de elementos recicláveis em desuso. 2021. 107f. Dissertação (Mestrado em Engenharia Mecânica) - Centro de Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, 2021.
Autor
Pereira Neto, Raimundo Vicente
Resumen
Studies on the thermal and economic feasibility of a solar box-type oven
made from recycled elements in disuse are presented. The solar furnace
manufacturing, assembly and operational processes are described. The device was
tested in two configurations, empty and loaded. Five tests were carried out:
stagnation, water heater, baking six cakes (4,500 g); two lasagnas (1,600 g) and
with a load of varied foods (3,200 g). A mathematical model was also developed,
based on the fundamental heat transfer equations, to estimate the temperatures
reached by the main elements of the oven. In addition, a comparative-qualitative
study was carried out between the studied device, the conventional gas stove and
the solar ovens developed by national and international researchers. The results
showed that the absorbing surface and the air reached temperatures of 144.2 ° C
and 124.5 ° C respectively, obtained in the vacuum test. The cakes were baked in
80 min; lasagna in 34 minutes and the simultaneous loading of a pizza, six breads,
two cakes, and ten breads, in 65 minutes. Still, the tests of stagnation and water
heater presented the following figures of merit, F1 = 0.0728 °C m2
/W. and F2 = 0.534
°C m2
/W respectively. The mathematical model showed good agreement between
the theoretical and experimental results. The comparative study showed the
superiority between the proposed solar oven and the others analyzed. It was also
demonstrated the viability of the solar oven to produce several foods
simultaneously. Therefore, it can be used as a food manufacturer, which could be
sold by people with low purchasing power, to generate jobs and income.
Keyword: solar energy, box solar oven, food baking, low cost, material reuse.