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Enhancement of convective heat transfer in a parabolic trough collector using vibrations - an introductory numerical analysis

Grzywnowicz Krzysztof, Bartela Łukasz, Remiorz Leszek, Stanek Bartosz

Journal of Power Technologies

2020

Vol. 100, nr 4

291--300

Energy generation systems based on renewable energy sources (RES) are rapidly gaining ground in the global power and heatmarket. Most of these systems are well-suited to distributed energy solutions, including distributed heat production. Individual users and local low-power plants can use solar thermal devices for the purpose of providing domestic hot water, heating and cooling. Nevertheless, the variability of solar irradiance can make it difficult to harvest energy efficiently all year round. Therefore, from the point of view of improving the overall, year-averaged operational parameters of a solar thermal device it isparamount to maximize the heat acquired from it at times ofhigh radiation flux. This paper discusses computational research on enhancing convective heat transfer in the absorber of a parabolic trough collector (PTC), through inducing vibrations of an immersed flat plate. The investigation identifies the influence of different amplitudes and frequencies of oscillatory motion on the absorber’s parameters, compares them with the construction of a classical absorber and considers flow turbulization. The results indicate there is only a limited application of vibrations to enhance operational parameters of solar thermal absorbers, with the best results obtained for thermal fluidflows of below 0.1 dms.