A comparative analysis of configurations of linear Fresnel collectors for concentrating solar power

Linear Fresnel collector arrays present some relevant advantages in the domain of concentrating solar power because of their simplicity, robustness and low capital cost. However, they also present important drawbacks and limitations, notably their average concentration ratio, which seems to limit significantly the performance of these systems. First, the paper addresses the problem of characterizing the mirror field configuration assuming hourly data of a typical year, in reference to a configuration similar to that of Fresdemo. For a proper comparative study, it is necessary to define a comparison criterion. In that sense, a new variable is defined, the useful energy efficiency, which only accounts for the radiation that impinges on the receiver with intensities above a reference value. As a second step, a comparative study between central linear Fresnel reflectors and compact linear Fresnel reflectors is carried out. This analysis shows that compact linear Fresnel reflectors minimize blocking and shading losses compared to a central configuration. However this minimization is not enough to overcome other negative effects of the compact Fresnel collectors, as the greater dispersion of the rays reaching the receiver, caused by the fact that mirrors must be located farther from the receiver, which yields to lower efficiencies.

Fresnel-based modular solar fields for performance/cost optimization in solar thermal power plants: A comparison with parabolic trough collectors.

Linear Fresnel collectors are identified as a technology that should play a main role in order to reduce cost of Concentrating Solar Power. An optical and thermal analysis of the different blocks of the solar power plant is carried out, where Fresnel arrays are compared with the most extended linear technology: parabolic trough collectors. It is demonstrated that the optical performance of Fresnel array is very close to that of PTC, with similar values of maximum flux intensities. In addition, if the heat carrier fluid flows in series by the tubes of the receiver, relatively high thermal efficiencies are achieved. Thus, an annual solar to electricity efficiency of 19% is expected, which is similar to the state of the art in PTCs; this is done with a reduction of costs, thanks to lighter structures, that drives to an estimation of LCOE of around 6.5 c€/kWh.

Disaster food stamp program handbook.

Mode of access: Internet.

The Wedgwood handbook. : A manual for collectors. Treating of the marks, monograms, and other tests of the old period of manufacture /

"First published London, 1875. Reprinted, 1963."

Migratory-bird hunting stamp : hearings before a subcommittee of the Committee on Agriculture, House of Representatives, Seventy-third Congress, second session, on H.R. 5632. January 31, 1934.

Mode of access: Internet.

Sources and collectors for use in calutrons /

Includes bibliographical references.

Food stamp program operations in New York State : report of the administration of the food stamp program within the State of New York.

Cover title.

Stamp book of birds : a put-together book.

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Multinational Species Conservation Funds Semipostal Stamp Act of 2009 : report (to accompany H.R. 1454) (including cost estimate of the Congressional Budget Office).

Mode of access: Internet.

One penny stamps. A popular explanation of the statute requiring a stamp duty of one penny on receipts and orders for money,

Mode of access: Internet.

Handbook for shell collectors; illustrations and descriptions of shells from all parts of the world.

Mode of access: Internet.

Map stamps of the world; a cooperative project of the Carto-Philatelists, the Map Stamp Unit of the ATA.

Mode of access: Internet.

Experimental verification of a standard test procedure for solar collectors /

Includes bibliographical references.

Uncertainty in determining thermal performance of liquid-heating flat-plate solar collectors /

"Issued April 1981."