terça-feira, 22 de janeiro de 2013
EXPOSICION SOBRE UPS EN LA FACULTAD DE INGENIERIA ELECTRONICA DE LA UNIVERSIDAD NACIONAL MAYOR DE SAN MARCOS 17 ENERO 2013 LIMA PERU
SI QUIERES BAJAR LA EXPOSICION COMPLETA LO TIENES EN LA SIGUIENTE DIRECCION A PALESTRA COMPLETA PODES BAIXAR NO SIGUENTE ENLACE
terça-feira, 1 de janeiro de 2013
MOURA, Johnson Pontes. – Construction and termic evaluation of a solar cooker of the type box. Program of Master Degree of Chemical Engineering – UFRN – Natal/RN – Brazil.
type box. Program of Master Degree of Chemical Engineering – UFRN – Natal/RN – Brazil.
The present work presents a contribution in the study of modelings of transference of heat for
foods submitted to the experimental tests in the considered solar oven, where the best
modeling for the beefburger of chicken in study was evaluated, comparing the results,
considering this food as a half-infinite (1er object considered model) and, after that,
considered the chicken beefburger as a plain plate in transient regimen in two distinct
conditions: not considering and another model considering the contribution of the generation
term, through the Criterion of Pomerantsev.
The Sun, beyond life source, is the origin of all the energy forms that the man comes using
during its history and can be the reply for the question of the energy supplying in the future, a
time that learns to use to advantage in rational way the light that this star constantly special
tax on our planet. Shining more than the 5 billion years, it is calculated that the Sun still in
them will privilege for others 6 billion years, or either, it is only in the half of its existence and
will launch on the Earth, only in this year, 4000 times more energy that we will consume.
Front to this reality, would be irrational not to search, by all means technical possible, to use
to advantage this clean, ecological and gratuitous power plant. In this dissertation evaluate the
performance of solar cooker of the type box.
Laboratory of Solar Energy of the Federal University of the Great River of North - UFRN was
constructed by the group (LES) a model of solar stove of the type box and was tested its
viability technique, considering modeling foods submitted when baking in the solar oven, the
cooker has main characteristic the easiness of manufacture and assembly, the low cost (was
used material accessible composition to the low income communities) and simplicity in the
mechanism of movement of the archetype for incidence of the direct solar light.
They had been proposals modeling for calculations of food the minimum baking time,
considering the following models of transference of heat in the transient state: object the halfinfinite,
plain plate and the model of the sphere to study the necessary temperature for the it
bakes of bread (considering spherical geometry). After evaluate the models of transmission of
heat will be foods submitted you the processes of to it bakes of, the times gotten for the
modeling with the experimental times of it bakes in the solar oven had been compared
demonstrating the modeling that more good that it portraies the accuracies of the results of the