Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Total Equivalent Warming Impact of alternative refrigerants for replacement of R-22
Submission Author:
Willian Moreira Duarte , MG , Brazil
Co-Authors:
Leonardo Victor Silva Martins, Luiz Machado, Tiago de Freitas Paulino, Juan Jose Garcia Pabon, Willian Moreira Duarte
Presenter: Willian Moreira Duarte
doi://10.26678/ABCM.COBEM2023.COB2023-1234
Abstract
The Montreal Protocol and its amendments have been increasingly restricting the use of refrigerant fluids, considering the significant environmental impact they can cause. However, a large portion of refrigeration and air con- ditioning units in developing countries like Brazil still operate with R-22, and discarding these equipments solely due to the refrigerant would result in not only economic but also environmental damages. In order to reuse these equipments, it is interesting to evaluate alternative refrigerants that, with minor modifications to the system, enable their reuse. There- fore, this study compared the coefficient of performance (COP) of R-22 and some of its alternatives as well as the Total Equivalent Warming Impact. The refrigerants considered were R-407C, R-444B, and R-454C. For this purpose, a lumped model was used for the heat exchangers and the model described in the Canadian standard AHRI 540 was used to the compressor. The average difference of COP was -9.24%, -5.02%, and -13.91% for R-407C, R-444B, and R-454C fluids, respectively. Total Equivalent Warming Impact found was 12.32, 12.37, 9.84 and 10.12 for the refrigerants R-22, R-407C, R-444B, and R-454C, respectively. In conclusion, considering the conditions and data of the study, the best refrigerant for retrofit of R-22 is the R-444B.
Keywords
R-22, Retrofit, TEWI, Modeling and Simulation
