Análise da eficiência exergética de um sistema de refrigeração VRF com diferentes tipos de refrigerantes
Variable Refrigerant Flow (VRF) air conditioning systems are currently being more used worldwide due to the recent search for more efficiency improved systems, which reflects direct on electric energy savings. The environmental impact of refrigerants used in air conditioning systems has increased th...
| Autor principal: | Santos, André Guidelli Camilo dos |
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| Formato: | Trabalho de Conclusão de Curso (Graduação) |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2020
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/10629 |
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| Resumo: |
Variable Refrigerant Flow (VRF) air conditioning systems are currently being more used worldwide due to the recent search for more efficiency improved systems, which reflects direct on electric energy savings. The environmental impact of refrigerants used in air conditioning systems has increased the discussions to find substitute refrigerants for conventional processes. In this work, an analysis of the exergetic efficiency of a VRF system adapted from Yildiz (2015) is proposed, with different types of refrigerants, in order to have an analysis of the losses and locations of improvement of the system, as well as to discuss about the choice of its refrigerant, with the prospect of its exergetic efficiency, as well its environmental impact. For such purpose, the system under study was constructed through a mathematical model for an exergetic analysis, its solution, originally for the R410a fluid, being extended to other cooling fluids of interest. Fluid data were obtained from the REFPROP program. It was found that R290 fluid did not reach cycle-feasible pressure and temperature values, and that the energy efficiencies were practically the same for all tested fluids. HFO fluids obtained exergetic efficiencies similar to R410a. The R459A, R454B and R446A fluids were suggested as substitutes for R410a, as they presented higher efficiency values and lower GWP, in addition to being characterized by a higher level of safety. |
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