Research Papers

Parametric Analysis of the Fixed Mirror Solar Concentrator for Medium Temperature Applications

[+] Author and Article Information
Ramon Pujol-Nadal

e-mail: ramon.pujol@uib.es

Andreu Moià-Pol

Departament de Física,
Universitat de les Illes Balears,
Ctra de Valldemossa km 7,5, 07122,
Palma de Mallorca, Illes Balears, Spain

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received January 10, 2013; final manuscript received November 12, 2013; published online December 19, 2013. Assoc. Editor: Werner Platzer.

J. Sol. Energy Eng 136(1), 011019 (Dec 19, 2013) (7 pages) Paper No: SOL-13-1015; doi: 10.1115/1.4026098 History: Received January 10, 2013; Revised November 12, 2013

The fixed mirror solar concentrator (FMSC) possesses a geometry that can produce thermal energy in medium temperature range. Due to its static reflector, the FMSC has several advantages when compared to other designs, such as being one of the best adapted for integration onto building roofs. An optical ray-tracing analysis of its geometry was presented in a previous paper (Pujol Nadal and Martínez Moll, 2012, “Optical Analysis of the Fixed Mirror Solar Concentrator by Forward Ray-Tracing Procedure,” Trans ASME J. Solar Energy Eng., 134(3), pp. 031009-1-14). The optical results were obtained in function of three design parameters: the number of mirrors N, the ratio of focal length and reflector width F/W, and the intercept factor γ (in order to represent different receiver widths). In this communication, the integrated thermal output of the same parameter combinations has been determined in order to find optimal values of the design parameters at a working temperature of 200 °C. The results were obtained for three different climates and two orientations (North-South and East-West). The results show that FMSC can produce heat at 200 °C with an annual thermal efficiency of 39, 44, and 48%, dependent of the location considered (Munich, Palma de Mallorca, and Cairo). The best FMSC geometries in function of the design parameters are exhibited for medium range applications.

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Fig. 1

Optical principle of the FMSC. The receiver moves along a circular path on the generating circle. The generating circle has a radius R, and the receiver is positioned by the θf angle. The position angle of the receiver is twice the transversal incidence angle (θf = 2θt). The receiver is rotated during the movement along the circle an angle θr = θt.

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Fig. 2

(a) Focal length F, reflector width W, and mirror number N. (b) Evacuated tube considered as a receiver.

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Fig. 3

θt and θl are the transverse and longitudinal angles that are the projected incidence angles on the two reference planes perpendicular and along the axis of the collector

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Fig. 4

Weather data considered: (a) monthly direct irradiation on a tilted 15 deg surface and south orientation; (b) monthly diffuse irradiation on a tilted 15 deg surface and south orientation; (c) monthly average temperature during solar hours

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Fig. 5

FMSC position defined by Tait–Bryan angles respect to the local coordiantes

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Fig. 6

Annual thermal efficiency referred to the direct irradiation on the reflector aperture by the number of mirrors N and for different γ values. FMSC with F/W = 2.0 in NS orientation and tilted angle of 15 deg. Weather in Palma de Mallorca.

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Fig. 7

Annual thermal efficiency for the three weather and two orientations proposed

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Fig. 8

Average values of the thermal efficiency of the two orientations and the three weather conditions for all cases studied



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