Numerical Investigation on the Performance of Two-Throat Nozzle Ejectors with Different Mixing Chamber Structural Parameters

Fatong Jia,Jing Xie,Dazhang Yang

doi:10.3390/en14216900

Abstract

In this study, the effects of the mixing chamber diameter (Dm), mixing chamber length (Lm) and pre-mixing chamber converging angle (θpm) were numerically investigated for a two-throat nozzle ejector to be utilized in a CO2 refrigeration cycle. The developed simulated method was validated by actual experimental data of a CO2 ejector in heat pump water heater system from the published literature. The main results revealed that the two-throat nozzle ejectors can obtain better performance with Dm in the range of 8–9 mm, Lm in the range of 64–82 mm and θpm at approximately 60°, respectively. Deviation from its optimal value could lead to a poor operational performance. Therefore, the mixing chamber structural parameters should be designed at the scope around its optimal value to guarantee the two-throat nozzle ejector performance. The following research can be developed around the two-throat nozzle geometries to strengthen the ejector performance.

Highlights

This study aimed to investigate the performance of two-throat nozzle ejectors employed in a vessel refrigeration system, which was installed between the intercooler and gas cooler to execute the first throttling process
The performance of a two-throat nozzle ejector changed with different dimensional parameters, including pre-mixing chamber converence angle, mixing chamber diameter and length, was studied under different working
The performance of a two-throat nozzle ejector changed with different dimensional parameters, including pre-mixing chamber converence angle, mixing chamber diameter and length, was studied under different working conditions

Summary

Introduction

Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Sustainable economy and societal development are limited by energy shortages and environmental pollution [1]. In terms of refrigeration systems, the use of traditional

Objectives

Results

Conclusion