Bilinear reduced order approximate model of parabolic distributed solar collectors

Evaluation of Surface Slope Irregularity in Linear Parabolic Solar Collectors

The paper describes amethodology, very simple in its application, for measuring surface irregularities of linear parabolic collectors. This technique was principally developed to be applied in cases where it is difficult to use cumbersome instruments and to facilitate logistic management. The instruments to be employed are a digital camera and a grating. If the reflector surface is defective, t...

Approximate controllability for linear degenerate parabolic problems with bilinear control

In this work we study the global approximate multiplicative controllability for the linear degenerate parabolic Cauchy-Neumann problem  vt − (a(x)vx)x = α(t, x)v in QT = (0, T )× (−1, 1) a(x)vx(t, x)|x=±1 = 0 t ∈ (0, T ) v(0, x) = v0(x) x ∈ (−1, 1) , with the bilinear control α(t, x) ∈ L(QT ). The problem is strongly degenerate in the sense that a ∈ C([−1, 1]), positive on (−1, 1), is all...

Robust control of solar plants with distributed collectors

This paper presents a robust control scheme for a distributed solar collector (DSC) field. As DSC are systems subjected to strong disturbances (mainly in solar radiation and inlet oil temperature), a series feedforward is used as a part of the plant, so that the system to be controlled has one input (fluid flow) and one output (outlet temperature) as the disturbances are partially compensated b...

Approximate Deconvolution Reduced Order Modeling

This talk proposes an approximate deconvolution reduced order model (AD-ROM). The new AD-ROM is developed within the large eddy simulation reduced order modeling (LES-ROM) framework, in which a differential filter is used to define the large ROM structures and the AD approach is used to solve the ROM closure problem. The AD-ROM is tested in the numerical simulation of a three-dimensional flow p...

Low Temperature Solar Collectors