A pressure exchange ejector invented by George Washington University’s Professor Charles Garris has been considered a novel concept for energy conversion and utilization of two working fluids. One of the applications of the pressure exchange ejector involves taking the captured waste heat from the car’s engine to assist in running its air conditioning system. This study involves implementing the pressure exchange ejector in a modified vapor compression air conditioning system and determining its feasibility with performance and sizing for a typical midsize sedan. The specific midsize sedan chosen in the analysis is the inline six-cylinder BMW 530i sedan. The analysis involves comparing previous results and data of high and low cooling loads from the conventional automotive air conditioning (A/C) system using R-134a refrigerant with a new steam pressure exchange ejector A/C system. The pressure exchange (PE) ejector similar to the conventional ejector can be represented by the turbomachinery analog. Desirable theoretically efficiencies of the PE ejector using the turbomachinery analog are varied to determine the minimal efficiency required to run the ejector air conditioning system. The performances of the ideal and minimum condition for the PE ejector A/C system are determined to view the potential and feasibility of the system. The system consists of environmentally friendly steam as a refrigerant and replaces the conventional A/C system’s engine driven compressor with an ejector and a second loop for waste heat recovery from the car’s engine exhaust system. Simulation tests of varying ejector efficiency under the designed A/C system and vehicle conditions are conducted through computational heat transfer and thermodynamic analysis using MATLAB/Simulink. The software is a numerical calculation and visualization software program where various environmental, thermodynamic, heat transfer, and sizing conditions can be monitored. Engine exhaust heat and conventional air conditioning results and properties are obtained through previous experiments and analysis at respected universities and laboratories.

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