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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
THERMO-ECONOMIC AND ENVIRONMENTAL ANALYSIS OF A VAPOR COMPRESSION REFRIGERATION SYSTEM USING R744 AS A REPLACEMENT FOR R134A
Submission Author:
Cleison Henrique de Paula , MG
Co-Authors:
Cleison Henrique de Paula, Leonardo Victor Silva Martins, Willian Moreira Duarte, Antônio Maia
Presenter: Cleison Henrique de Paula
doi://10.26678/ABCM.ENCIT2020.CIT20-0135
Abstract
This paper presents a mathematical model to design a vapor compression refrigeration system that simultaneously produces chilled water (5°C) for an indirect expansion air-conditioning system and hot water (40°C) for bath. Besides, the proposed model uses commercial diameters in the modeling of the heat exchangers and volumetric and global efficiency curve obtained from commercial compressors available in the market. The environmental analysis was performed based on TEWI (total equivalent warming impact), while the thermo-economic analysis was performed based on COP (Coefficient of Performance), Exergy Efficiency and Total plant cost rate. The thermo-economic and environmental analysis indicated that the system with R744 has lower energy, exergy and economic performance and higher environmental performance for an evaporation temperature of -3°C and condensation/gas cooling temperature of 45°C. Therefore, the system operating with R744 is not suitable to replace the system with R134a because the system with R744 is more expensive.
Keywords
TEWI, COP, Exergy efficiency, Total plant cost rate, Vapor Compression refrigeration System
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