Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
THERMO-ECONOMIC ANALYSIS OF LOW-GWP REFRIGERANTS IN CASCADE REFRIGERATION SYSTEMS WITH R744
Submission Author:
Paulo Eduardo Lopes Barbieri , MG , Brazil
Co-Authors:
Hugo José Abreu de Souza, Paulo Eduardo Lopes Barbieri, Ralney Faria, Tiago de Freitas Paulino
Presenter: Hugo José Abreu de Souza
doi://10.26678/ABCM.COBEM2021.COB2021-1445
Abstract
Cascade refrigeration systems are widely used in commercial refrigeration because of their compactness and their ability to provide two different cooling demands at medium and low temperature with high values of COP compared with single-stage vapor compression cycles. Thus, for low-temperature cycle, CO2 (R744) is commonly used due to its low-cost, environmental advantages and the high working pressures at low temperatures. For the high temperature cycle, R134a (GWP100: 1300) and R404A (GWP100: 3943), as well as its corresponding drop-ins, are the most used solutions due to its feasibility, availability and good performance. Because of environmental problems related to global warming and ozone depleting effects, research on alternative refrigerant has attracted interest. Despite the large number of works, there are a limited number of analyses that evaluate thermo-economically the use of low-GWP refrigerants in a cascade high temperature cycle. This paper presents a comparative study with different low-GWP refrigerants alternatives to replace R134a in an R134a/R744 cascade system. It considered R32, R450A, R454C, R513A, R1234yf, R290, R600a and R1270 as options in high temperature cycle. Evaluation and optimization of the thermodynamic and economic performance were conducted by EES (Engineering Equation Solver). From the simulations results is demonstrated that the use of R1270 is the best option for high temperature cycle.
Keywords
CASCADE REFRIGERATION, thermo-economic analysis, Low GWP Refrigerants, R744
