Beam Characterization and Improvement with a Flux Mapping System for Dish Concentrators

Abstract

A flux mapping system able to measure the flux distribution of dish/Stirling systems in planes perpendicular to the optical axis was built and operated at the Plataforma Solar de Almerı´a (PSA). It uses the indirect measuring method with a water-cooled Lambertian target placed in the beam path and a CCD-camera mounted on the concentrator taking images of the brightness distribution of the focal spot. The calibration is made by calculating the total power coming from the dish and relating it to the integrated gray value over the whole measurement area. The system was successfully operated in a DISTAL II stretched membrane dish and in the new EURODISH in order to characterize their beams and improve the flux distribution on their receivers.

Experimental flux measurement of a high-flux solar simulator using a Lambertian target and a thermopile flux sensor

“…Accurate boundary conditions are imperative in any analysis, and the development of solar receivers demands precise knowledge of the radiative input and its distribution at the focal plane of the receiver. Therefore, this paper addresses the design and implementation of a flux measurement system to accurately characterize the flux distribution of the high-flux solar simulator at KTH based on a Lambertian target [2] and a thermopile flux sensor. The system allows obtaining a twodimensional flux profile at the focal plane of the HFSS and is designed so that it is possible to acquire a threedimensional flux profile by moving the target away from the focal plane in the future.…”

Concentrated Radiation Measurement System for Solar Furnace

“…The end of the bar is fixed to the output shaft of a stepper motor, which drives the bar to rotate in the focal plane by the control of the computer. Because of the high reflectivity, it is able to resist flux density about 10MW/m 2 without cooling water [2]. …”

Experimental and numerical characterization of a new 45 kW_el multisource high-flux solar simulator

“…As indicated in Fig. 1(d), the arrangement of the radiation modules allows positioning of the camera coaxially with the HFSS, avoiding the need for a geometric transformation of the raw images [15,16]. The GS live images are first used to manually adjust the orientation of each radiation module and the position of the lamp relative to the reflector, to maximize the radiative flux at the focus.…”