Active Filters Application for Energy Losses Reduction in Three-Phase Power Supply Systems

Efficiency Improvement of Eco-Friendly Solar Heat Supply System as a Building Coating

“…In the case when the covering is the Grafplast PDA on the solar collector and using Prandelli/Tuborama pipes with diameters of 0.016 m and 0.025 m with radiation intensities of 500 W/m 2 and 1000 W/m 2 , the efficiency of the solar collector is visible in Figures 12 and 13, respectively, when the heat carrying flow rate is equals 1-G = 0.0125 kg/s; 2-G = 0.00833 kg/s; and 3-G = 0.00417 kg/s. The analysis of diagrams (Figures [7][8][9][10][11][12][13] shows that the diameter of the tubes and the distance of their arrangement have a minor effect. That is why it is convenient to present the Grafplast-coated panel efficiency depending only on the heat flow and mass flow rate of the heat carrier.…”

“…However, the diameter of the pipes and the distance between them does not significantly increase the efficiency coefficient of the solar collector and the SHS system. The consolidated nomogram of the system efficiency coefficient was constructed and presented in the publication [11]. It considers the types of coatings and pipes.…”

“…They can be obtained from metrological stations, but these are few in number and record daily, monthly average daily amounts, or full monthly amounts of solar energy only. However, these data can also be obtained from the relevant literature [11,12].…”