The Temperature of the Liquid Flowing in the Solar Collectors Tubes
ISES Solar World Congress 2009: Renewable Energy Shaping Our Future: CD Proceedings 2009
Peteris Šipkovs, Gaļina Kaškārova, Kristina Ļebedeva, Mārtiņš Vanags, Lana Migla, Voldemārs Barkāns

The paper presents a mathematical description for the heat conduction proceeding on the plane surface of a solar collector’s absorber divided into three parts for each of which the Laplace equation with boundary conditions is formed. Applying definite approximations the authors have completely described mathematically the heat conduction process initiating in the plane part of a collector’s absorber, then passing to a tube and from the tube to the liquid flowing through it. An analytical expression is proposed for description of the temperature field in the collector’s absorber taking into account the difference between the temperatures in the absorber and the temperature of the liquid flowing through the tube of the absorber. After verification of the mathematical model as to its correlation with practice, measuring methodology has been worked out for optimising the parameters of the collector’s absorber. The expression found for the temperature of liquid consists of two terms. One of them is the initial temperature of liquid including the solar radiation density, the absorber plate thickness, the thermal conductivity of the absorber plate, and the distance between the tubes. The second term characterises the temperature variations under the influence of solar radiation and includes more detailed parameters of the absorber. Since the rate of change of the second term characterises the collector’s efficiency, by varying the parameters in this term the authors seek for the most efficient simulation model for the collector.


Atslēgas vārdi
solar collectors, absorber, liquid flowing

Šipkovs, P., Kaškarova, G., Ļebedeva, K., Vanags, M., Migla, L., Barkāns, V. The Temperature of the Liquid Flowing in the Solar Collectors Tubes. No: ISES Solar World Congress 2009: Renewable Energy Shaping Our Future: CD Proceedings, Dienvidāfrikas republika, Johannesburg, 11.-14. oktobris, 2009. Johannesburg: Document Transformation Technologies cc., 2009, 810.-815.lpp.

Publikācijas valoda
English (en)
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