Inverse illumination method for characterization of CPC concentrators

Optical simulation of Rondine®PV solar concentrators by two inverse characterization methods

“…The original inverse method developed by Parretta et al [17][18][19][20][21][22][23][24][25] for the characterization of solar concentrators is the simplest among the many methods based on measurements with a charge coupled device (CCD) camera. Here we summarize the main features of this method.…”

“…The optical efficiency and flux distribution on the receiver will be evaluated therefore as a function of the orientation of the beam with respect to a reference frame fixed to the concentrator, and as a function of wavelength, if the experimental apparatus is provided for spectral measurements. The 'optical characterization' of a solar concentrator can be performed following different approaches [6][7][8][9][10]; here we will focus our attention on the so-called 'inverse' method of characterization [17][18][19][20][21][22][23][24][25]. It is the opposite of the commonly used 'direct' method, where the angle-resolved transmission efficiency is obtained by irradiating the input aperture with a parallel beam of known irradiance and measuring the output flux for all the significant incidence directions, polar and azimuthal.…”

Direct and Inverse Methods of Characterization of Solar Concentrators

“…With the "inverse" methods we test the concentrator by irradiating the output aperture, therefore reversing the light path occurring during normal operation. The inverse method, IM, as introduced in [5], is an alternative way to obtain the angle-resolved optical efficiency of a concentrator. It is characterized by a remarkable rapidity of measurements and by a simple apparatus with respect to direct method (DM).…”

“…4b) produces an irradiance distribution E inv rel (δ, φ) whose profile, corrected by the cos -4 (δ) factor, gives the relative radiance L inv rel (δ, φ) of concentrator towards (δ, φ) direction. It can be demonstrated [5,6] that L inv rel (δ, φ) is equivalent to the relative "direct" angle-resolved transmission efficiency η dir The validity of equivalence:…”

Design and analysis of a CPC with single vacuum tube for linear Fresnel reflector system

“…国内外学者 对 CPC 进行了较多的研究, 如 Muschaweck 等人 [14] 用数值和光线跟踪法对一种在实际工作环境下的 CPC 进行了优化. Parretta 等人 [15] 采用太阳能模拟器 对 CPC 表面光学特性进行了试验分析; 陈华林等 人 [16]…”