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Type: Artigo de periódico
Title: Influence Of The Temperature On The Latent Heat Of Vaporization Of Moisture From Cowpea (vigna Unguiculata (l.) Walp.), Always-green Variety [influência Da Temperatura Do Ar De Secagem No Calor Latente De Vaporização De água Em Feijão Macassar (vigna Unguiculata (l.) Walp.), Variedade Sempre-verde]
Author: Da Silva W.P.
E Silva C.M.D.P.S.
Precker J.W.
E Silva D.D.P.S.
Abstract: In order to determine the energy needed to artificially dry an agricultural product the latent heat of vaporization of moisture in the product, H, must be known. Generally, the expressions for H reported in the literature are of the form H = h(T)f(M), where h(T) is the latent heat of vaporization of free water, and f(M) is a function of the equilibrium moisture content, M, which is a simplification. In this article, a more general expression for the latent heat of vaporization, namely H = g(M,T), is used to determine H for cowpea, always-green variety. For this purpose, a computer program was developed which automatically fits about 500 functions, with one or two independent variables, imbedded in its library to experimental data. The program uses nonlinear regression, and classifies the best functions according to the least reduced chi-squared. A set of executed statistical tests shows that the generalized expression for H used in this work produces better results of H for cowpea than other equations found in literature.
Rights: aberto
Identifier DOI: 10.1590/S0100-69162008000200012
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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