Research Papers: Alternative Energy Sources

Computing the Exergy of Solar Radiation From Real Radiation Data

[+] Author and Article Information
Manuela Neri

Department of Industrial and
Mechanical Engineering,
University of Brescia,
Brescia 25121, Italy
e-mail: manuelaneri.brescia@gmail.com

Davide Luscietti

Department of Industrial and
Mechanical Engineering,
University of Brescia,
Brescia 25121, Italy
e-mail: davide.luscietti@unibs.it

Mariagrazia Pilotelli

Department of Industrial and
Mechanical Engineering,
University of Brescia,
Brescia 25121, Italy
e-mail: mariagrazia.pilotelli@unibs.it

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received November 23, 2016; final manuscript received May 11, 2017; published online June 8, 2017. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 139(6), 061201 (Jun 08, 2017) (7 pages) Paper No: JERT-16-1473; doi: 10.1115/1.4036772 History: Received November 23, 2016; Revised May 11, 2017

The decrease of fossil fuels availability and the consequent increase of their price have led to a rapid evolution of renewable market and policy frameworks in recent years. Renewable resources include solar radiation, which is of considerable interest as it is inexhaustible, free, and clean. In order to calculate how much work can be obtained from solar radiation, several methods have been proposed in the literature and are here reviewed. In this paper, a single exergy factor to be applied to the total radiation measured on horizontal surface in a given place is proposed. The factor is estimated from both direct and diffuse radiation.

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Grahic Jump Location
Fig. 1

Solar radiation scheme

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Fig. 2

The cyclic machine

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Fig. 3

Italian location analyzed: AG, AL, AN, AO, AP, AQ, BA, BL, BN, BO, BR, BZ, CA, CB, CL, CO, CS, CZ, EN, FE, FG, FI, FO, FR, GR, GE, GO, LI, MC, ME, MI, MN, NA, OR, PE, PG, PR, PT, PZ, RI, RM, RN, SO, SP, TA, TO, TN, TP, TR, VA, VE, VI

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Fig. 4

Exergy factor of direct solar radiation

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Fig. 5

Exergy factor of diffuse solar radiation

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Fig. 6

Exergy factor of total solar radiation

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Fig. 7

Total exergy factor as function of altitude

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Fig. 8

Total exergy factor as function of latitude

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Fig. 9

Total exergy factor as function of yearly air temperature average

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Fig. 10

Total exergy factors as function of the ratio between direct and diffuse radiation

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Fig. 11

Total exergy factor: comparison between data calculated by Pons [23] and data that calculated by the authors




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