Application of experimental and numerical methodologies for the development of an absortion heat pump for solar-driven systems
(English) The topics explained in this thesis are organized in different chapters. A summary of the contents is given below: Chapter 2. Details of working pairs and properties with numerical modelling and experimental validation. Some thermodynamical/thermophysical properties of working fluid pairs...
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| Tipo de recurso: | tesis doctoral |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/400808 |
| Acceso en línea: | https://hdl.handle.net/2117/400808 https://dx.doi.org/10.5821/dissertation-2117-400808 |
| Access Level: | acceso abierto |
| Palabra clave: | Àrees temàtiques de la UPC::Enginyeria mecànica |
| Sumario: | (English) The topics explained in this thesis are organized in different chapters. A summary of the contents is given below: Chapter 2. Details of working pairs and properties with numerical modelling and experimental validation. Some thermodynamical/thermophysical properties of working fluid pairs are experimentally measured or mathematically modelled. The related properties are specific entropy, specific exergy, activity coefficients, electrical conductivity, surface tension, contact angle, and properties of nanofluid working pairs. Chapter 3. Measurement of minimum wetting rate and dry patch method modelling. Minimum Wetting Rate (MWR) is measured on vertical tubes with various solid materials, and the effect of super hydrophilic coating surface and surfactant is studied. The content in this chapter is focused on the flow pattern of falling film and effect from surface treating, surfactants to it. Chapter 4. Theoretical and numerical solutions of vertical falling film in mass and heat transfer problem. The heat transfer in the vertical falling film is investigated with analytical solutions, numerical modelling, and experimental validation. Also, falling film absorption is simulated using the smooth laminar theory for the working pairs LiBr-H2O and Carrol-H2O. Moreover, the impact of nanofluid with Al2O3 is also studied. The content in this chapter is focused on the heat and mass transfer of the verticalfalling film. Chapter 5. Numerical studies on an air-cooled absorption machine. Steady-state and dynamic simulations for the absorption system with different working pairs (LiBrH2O and Carrol-H2O) are carried out. Energy and exergy analysis is employed to demonstrate the effect of the working fluid pairs on the absorption system. In this chapter, the work will be focused on the energy and exergy analysis of the absorption system to locate an optimal operating condition or strategy. Chapter 6: Air-cooled absorption machine simulation with performance enhancement. Heat and mass transfer performance enhancements are employed in the simulation to predict enhanced performance. Surface treating components, surfactants, nanofluid, and mechanical vibration are studied to predict their effect on the final system performance. In this chapter, the work will be focused on the various methods of enhancements to the absorption system performance to achieve better performance. Chapter 7. Integration of the air-cooled machine in a solar heating/cooling system. An FPC with TIM and aerogel is demonstrated for this work and described with experimental results. Then the solar collector is introduced to the absorption system as the heat source, and the whole system is simulated with the same platform. Meteorology data from Spain are employed to predict a long-term (5 days) real-time performance (winter and summer seasons) of the solar-assisted absorption system and the solar fraction. Chapter 8: General conclusions and future work. |
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