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Strojarstvo : časopis za teoriju i praksu u strojarstvu, Vol. 54 No. 6, 2012.

Preliminary communication

Influence analysis of the characteristic coefficients of solar domestic water systems tested according to the Standard ISO 9459-2 regarding its long term prediction

Jonathan Vera ; Solar Thermal Energy Department, National Renewable Energy Centre (CENER), Sarriguren, Spain
Isidoro Lillo ; Thermodynamic and Renewable Energies Group (GTER), University of Seville, Seville, Spain
Jaime Olmo Fernández ; Thermodynamic and Renewable Energies Group (GTER), University of Seville, Seville, Spain
Fabienne Sallaberry ; Solar Thermal Energy Department, National Renewable Energy Centre (CENER), Sarriguren, Spain

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Abstract

The Solar Thermal Testing Laboratory shared by CENER and GTER in Seville performs outdoor efficiency tests for factory-made solar systems according to the international standard ISO 9459-2.This method (CSTG acronym for “Collector and System Testing Group”, also called the input-output method) consists of three different parts: one part for determining mixing in the storage tank during draw-off, another part for determining daily system performance, and a part for the determination of storage tank heat losses. From the so-called CSTG test, the following coefficients are obtained: the characteristic coefficients of the solar system in the daily performance (a1, a2, a3), the normalized draw-off temperature profile (f(V)), the normalized mixing draw-off temperature profile (g(V)) and the storage tank heat loss coefficient (Us).After having tested some solar systems according to the CSTG method, the long term prediction of the system output is performed using a simulation program. Using the obtained test results as a starting point, we vary the parameters stepwise and observe how this influences the solar fraction fsol. Therefore, the purpose of the present paper is to analyze the influence of those parameter variations on the solar fraction fsol obtained from the long-term prediction in different reference locations (Stockholm, Würzburg, Davos and Athens) and for various solar systems with a different volume/area ratio.

Keywords

Solar system; ISO Standard testing; Certification

Hrčak ID:

98209

URI

https://hrcak.srce.hr/98209

Publication date:

21.12.2012.

Article data in other languages: croatian

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