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This article is cited in 1 scientific paper (total in 1 paper)
A discrete model of the heat exchange process in rotating regenerative air preheaters
A. A. Azamov, M. A. Bekimov Institute of Mathematics, National University of Uzbekistan named by after Mirzo Ulugbek
Abstract:
We propose a mathematical model of the heat transfer process in a rotating regenerative air preheater of a thermal power plant. The model is obtained by discretizing the process as a result of averaging both temporal and spatial variables. Making a number of simplifying assumptions, we write a linear discrete system $z(n+1)=Az(n)+r(n)$ of order $2m$ with a monomial $2m\times2m$ matrix $A=(a_{ij})$ in which $a_{ij}=\alpha_i$ for $i=1$, $j=2m$ and for $i=2,\ldots, 2m$, $j=i-1$, whereas all the other elements are zero. Using the relation $A^{2m}=\left(\prod_{i = 1}^{2m}{\alpha _{i}}\right)E$ and the Cauchy formula, we study the stability, periodicity, and convergence of the Cesaro means and other properties. We also consider the identification problem consisting in finding unknown coefficients $\alpha_i$, $i=1,2,\ldots, 2m,$ from the values $z(1), z(2), \ldots, z(2m)$ of the trajectory. Under the assumption $r(n)=r=const$ for $n=1,2,\ldots, 2m$, we transform the problem to the matrix equation $AY=B$, where the square matrix $Y$ is composed of the columns $y_1=t=r-(E-A)z_0$, $y_2=Ay_1+t$, $\ldots$, $y_{2m}=Ay_{2m-1}+t$ and $B=[t-y_2, t-y_3, \ldots, t-y_{2m-1}]$. A recurrent relation is derived for $\det Y$. It is proved that, if $\Delta=\alpha_1\alpha_2\ldots\alpha_m-\alpha_{m+1}\alpha{m+2}\ldots \alpha_{2m}\neq 0$, then $\det Y\neq0$ and $A=BY^{-1}$.
Keywords:
heat transfer process, cyclic process, monomial matrix, averaging, linear discrete equation, Cauchy formula, steady state behavior, periodic mode, Ces'aro mean, identification.
Received: 21.11.2016
Citation:
A. A. Azamov, M. A. Bekimov, “A discrete model of the heat exchange process in rotating regenerative air preheaters”, Trudy Inst. Mat. i Mekh. UrO RAN, 23, no. 1, 2017, 12–19
Linking options:
https://www.mathnet.ru/eng/timm1380 https://www.mathnet.ru/eng/timm/v23/i1/p12
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Abstract page: | 255 | Full-text PDF : | 68 | References: | 47 | First page: | 11 |
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