Abstract
CFD analysis of operating condition effects on optimum nozzle exit position of a supersonic ejector using the refrigerant R134a
Highlights
The ejector has been widely employed in refrigeration, air conditioning, petroleum refining, desalination, chemical systems, and other fields as an energy-recovering device owing to its simple structure, safety, reliability, and low-grade energy for use as a power source [1]
This paper presents a computational fluid dynamics (CFD) model for studying the performance of the supersonic ejector of a refrigeration system using R134 as the working fluid
It is noted that the optimum nozzle position is highly dependent on operating conditions
Summary
The ejector has been widely employed in refrigeration, air conditioning, petroleum refining, desalination, chemical systems, and other fields as an energy-recovering device owing to its simple structure, safety, reliability, and low-grade energy for use as a power source [1] It is composed of four main parts: a nozzle, a suction chamber, a mixing chamber, and a diffuser. The mixture flows to the diffuser and its velocity falls gradually so that kinetic energy is converted into potential energy and a relatively high-pressure flow occurs [2] Several factors such as the compression ratio RCOM are used to assess the performance of an ejector refrigeration system. The design dimensions include the distance between the primary nozzle exit and the entrance of the mixing chamber, which is called the nozzle exit position (NXP) This distance is sometimes presented in its nondimensional form with respect to the throat diameter. A discussion about the CFD model basis and computed results is presented
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