Elsevier

Energy Reports

Volume 8, November 2022, Pages 1114-1123
Energy Reports

Research paper
Optimization of motive nozzle position in a modified two-phase ejector expansion household refrigeration cycle using an artificial neural network

https://doi.org/10.1016/j.egyr.2021.12.033Get rights and content
Under a Creative Commons license
open access

Highlights

  • An experiment was conducted with various ejector designs and working conditions.

  • An ANN model of a household refrigeration cycle with an ejector was developed.

  • The effects of the NXP on the performance were analyzed under various conditions.

  • The correlation for the optimum NXP was proposed using the developed ANN model.

  • The optimum NXP was proposed according to the operating and geometrical conditions.

Abstract

Two-phase ejectors are highly useful devices because they can recover and use the energy lost in the expansion process of the refrigeration cycle. However, in a small-sized household refrigeration cycle, a modified ejector cycle is required due to the low operating pressure and mass flow rate. In this study, a dual evaporator ejector cycle (DEEC), which is advantageous for household refrigeration, was applied. In the DEEC, unlike the conventional ejector cycle, the motive nozzle exit position (NXP) considerably affects the cycle performance. The objective of this study was to optimize the NXP of a DEEC for a household refrigeration cycle with low-pressure refrigerants via an artificial neural network (ANN) model. Using the developed model, the DEEC pressure lifting ratio and coefficient of performance (COP) were analyzed under various operating and ejector geometry conditions. Moreover, the optimal NXP of a small-sized household DEEC was proposed using the developed correlation to achieve maximum performance under different operating conditions. The COP of the DEEC with the optimized NXP is 2.3% and 8.4% higher than those of the DEEC with the conventional NXP and the baseline cycle, respectively. These results validate the ANN model used for optimization and serve as design guidelines for obtaining optimized NXPs and cycle performance with increased energy efficiency.

Keywords

Two-phase ejector
Nozzle exit position
Dual evaporator ejector cycle
Optimization
Artificial neural network

Cited by (0)