Banca de QUALIFICAÇÃO: AUGUSTO VEIGA DE SOUZA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : AUGUSTO VEIGA DE SOUZA
DATE: 23/03/2023
TIME: 14:00
LOCAL: CEFET Campus II
TITLE:

THERMODYNAMIC ANALYSIS AND OPTIMIZATION OF A MODIFIED CASCADE REFRIGERATION SYSTEM USING A TWO-PHASE EJECTOR FOR LOW GWP FLUIDS

KEY WORDS:

Ejector Sizing, Cascade Cooling, Optimization, Exergetic Destruction,Low-GWP refrigerants.

PAGES: 77
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUMMARY:

Cascade refrigeration systems (CRS) employ in series two or more single-stage units that are thermally coupled with the cascade condenser/evaporator. Different refrigerants are used in each of the circuits, depending on the optimum characteristics of the refrigerant for a particular application. An efficient method to improve system performance and reduce energy losses through the expansion process can be employed by using a two-stage ejector (also called an expander ejector) together with a conventional throttling valve. In this context this work performed a thermodynamic analysis and optimization of a modified cascade refrigeration cycle with a two-phase ejector for different fluids with low global warming potential (GWP). The mathematical models of the SRC and the ejector was developed in MATLAB software. The fluid properties are provided through a link to the REFPROP library. A multiobjective particle swarm optimization (PSO) method was performed in order to find the point of maximum efficiency of the modified cascade cycle with the ejector.

COMMITTEE MEMBERS:
Interno - PAULO EDUARDO LOPES BARBIERI
Presidente - RALNEY NOGUEIRA DE FARIA
Interno - TIAGO DE FREITAS PAULINO