Abstract
The object of research is the thermal efficiency of solar collectors based on aluminum structural heat pipes. Solar collectors with heat pipes have a structurally similar design. The heat-absorbing panel secures the heat pipes to the evaporation zone, and the condensation zones are located in the battery tank. The differences are only in the designs of the absorption panels, the areas of the condensation zones and the heat carriers of the heat pipes. One of the most problematic places of research is the justification and development of a new design of a heat-absorbing solar collector panel based on heat pipes.A review of the publications showed that a solar collector based on aluminum structural heat pipes operating in the two-phase thermosyphon mode has a heat loss when transmitting radiation heat exchange in the long-wavelength range between the absorbing flat panel and the heat pipe. The project of a solar collector with a new, absorbing solar rays panel is proposed. To analyze the efficiency of the solar collector based on aluminum structural heat pipes with a new absorption panel, two models of solar collectors were created – with a flat absorber panel and a cylindrical absorber panel.The models of solar collectors based on one aluminum structural heat pipe fixed on aluminum flat and aluminum cylindrical absorption surfaces are investigated by the method of thermophysical experiment.The results of studies of the efficiency of solar collector models are presented. The thermal efficiency of a new solar collector based on an aluminum structural heat pipe with a cylindrical absorbing panel in the initial period of heating water is up to 1 5 % higher than that of a solar collector with a flat absorbing panel, and at the end of heating up to 4 %. The cylindrical surface of the panel plays the role of a concentrator of the reflected part of the radiation and the own radiation of the panel in the region of the heat pipe.Further studies are planned to be conducted in the direction of optimization of the geometric parameters of the heat-absorbing surfaces of solar collectors.
Highlights
When creating heat and mass transfer devices using heat pipes (HP) or two-phase thermosiphons (TPT), it opens up great opportunities for solving problems in new energyefficient systems [1,2,3]
A new design of the solar collector element is developed and investigated, on the basis of which it is possible to increase the thermal efficiency of the solar collector based on aluminum structural heat pipes
It is shown that the thermal efficiency of a new solar collector based on an aluminum structural heat pipe with a cylindrical absorbing panel in the initial period of heating water is up to 6 % more than in a solar collector with a flat absorbing panel, and at the end of heating up to 1.5 %
Summary
When creating heat and mass transfer devices using heat pipes (HP) or two-phase thermosiphons (TPT), it opens up great opportunities for solving problems in new energyefficient systems [1,2,3]. There are various design solutions using HP and TPT in energy saving systems [1, 4, 5]. In systems operating using renewable energy sources [6, 7]. HP and TPT have a good prospect for use in solar energy systems. There is already an industrial production of HP (TPT) and solar collectors (SC) based on them [8]. In the SC HP and TPT, they provide simplification of the collection of structures, high modularity, maintainability and reliability. An active system uses an electric pump to circulate fluid through a manifold. The passive system does not have a pump and uses only natural circulation. SC with HP or TPT are structurally similar to execution
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