APPLICATION OF ENERGY-EFFICIENT ICE-ACCURACKING TECHNOLOGIES IN AIR CONDITIONING SYSTEMS
An analytical model for the flow of heat carrier in natural-circulation (thermosiphon) solar water heaters is presented. A differential equation for the flow velocity is derived, accounting for the gravitational driving head due to density differences between hot and cold fluid a...
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| Datum: | 2025 |
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| Hauptverfasser: | , |
| Format: | Artikel |
| Sprache: | Ukrainian |
| Veröffentlicht: |
Institute of Renewable Energy National Academy of Sciences of Ukraine
2025
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| Schlagworte: | |
| Online Zugang: | https://ve.org.ua/index.php/journal/article/view/566 |
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| Назва журналу: | Vidnovluvana energetika |
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Vidnovluvana energetika| Zusammenfassung: | An analytical model for the flow of heat carrier in natural-circulation (thermosiphon) solar water heaters is presented. A differential equation for the flow velocity is derived, accounting for the gravitational driving head due to density differences between hot and cold fluid and for hydraulic losses (friction and local resistances). The time evolution of the temperature difference between the heated and cold sections of the loop is characterized and described by a generalized gamma-like function with a controllable peak. Using the derived model, the unsteady velocity and volumetric flow rate of the circulating fluid are simulated numerically. Graphs of are provided, as well as a surface illustrating the relationship between flow rate, time, and temperature head. The conclusions highlight the scientific novelty of the results, their practical significance for designing efficient thermosyphon solar heaters, and directions for further research, including accounting for nonlinear fluid properties and system optimization. |
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