Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Theoretical performance evaluation of the new zeotropic refrigerant R457B and its blends in a vapor compression refrigeration cycle
Submission Author:
Leonardo Nascimento , MG , Brazil
Co-Authors:
Leonardo Nascimento, Luís Antônio Bortolaia
Presenter: Leonardo Nascimento
doi://10.26678/ABCM.COBEM2023.COB2023-0422
Abstract
Refrigerants with low global warming potential (GWP) are widely studied for application in refrigeration systems. However, refrigerants with high GWP have been broadly used in heating, ventilation, air conditioning and refrigeration systems (HVAC-R). As evidenced in the Paris Agreement, there is an estimated increase of approximately two degrees celsius in the temperature of the globe. Thus, in order to ensure a sustainable development of the refrigeration area, this paper presents an energy and exergy analysis of the new zeotropic refrigerant R457B and it’s blends in a vapor compression refrigeration system. The main goal is to analyze the drop-in possibility of R134a and for this purpose the First and Second Law of Thermodynamics are applied. The simulation is carry out in MATLAB, where performance and flammability are analyzed. The selected blends have GWP and RF (refrigerant flammability) lower than 150 and 30 kJ/g. All the refrigerants reduced the coefficient of performance (COP) when compared to R134a, nevertheless, RGTB4 (R32/1234yf/152a wt% of 3.0/35.0/62.0) reduced the COP by only 1.4%. In addition, although RGTB4 led to a 2.9% drop in volumetric refrigeration capacity, GWP was reduced by around 13 times compared to R134a, making it a suitable blend for drop-in.
Keywords
blend, COP, GWP, RF, Temperature
