Optimization of a liquid injection NH3/CO2 cascade refrigeration system. Energetic, exergetic and environmental assessment

IF 6.9 2区环境科学与生态学 Q1 ENGINEERING, CHEMICAL

Process Safety and Environmental Protection Pub Date : 2025-02-09 DOI:10.1016/j.psep.2025.106862

Malek Hamzaoui , Ali Grine , Samir Tiachacht , Hani Beltagy

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Abstract

This article presents an in-depth numerical study on optimizing the operation of a liquid-injection cascade refrigeration system. The main objective is to determine the optimal operating point that maximizes the COP within the temperature ranges of 30°C <T_C< 60°C and −55°C<T_E< -30°C. A comprehensive mathematical model was developed to simulate the thermodynamic behavior of the system, taking into account the liquid injection processes. Optimization, based on a bio-inspired metaheuristic algorithm (Puma), was used to determine the optimal operating parameters, such as T_3L, the injection pressures and flow rates. The results show that liquid injection significantly improves system performance by reducing energy consumption, exergy destruction, and compressor discharge temperature. Additionally, an environmental analysis based on the Total Equivalent Warming Impact (TEWI) was conducted to assess the environmental impact of the system. The results show that the optimized system has a lower TEWI compared to conventional systems, highlighting its potential for reducing greenhouse gas emissions. Finally, correlations providing T₃_L, injection pressures, flow ratios, and optimal COPs are provided to give valuable information for the design and operation of more efficient and environmentally friendly liquid-injection cascade refrigeration systems.

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来源期刊

Process Safety and Environmental Protection 环境科学-工程：化工

CiteScore

11.40

自引率

15.40%

发文量

929

审稿时长

8.0 months

期刊介绍： The Process Safety and Environmental Protection (PSEP) journal is a leading international publication that focuses on the publication of high-quality, original research papers in the field of engineering, specifically those related to the safety of industrial processes and environmental protection. The journal encourages submissions that present new developments in safety and environmental aspects, particularly those that show how research findings can be applied in process engineering design and practice. PSEP is particularly interested in research that brings fresh perspectives to established engineering principles, identifies unsolved problems, or suggests directions for future research. The journal also values contributions that push the boundaries of traditional engineering and welcomes multidisciplinary papers. PSEP's articles are abstracted and indexed by a range of databases and services, which helps to ensure that the journal's research is accessible and recognized in the academic and professional communities. These databases include ANTE, Chemical Abstracts, Chemical Hazards in Industry, Current Contents, Elsevier Engineering Information database, Pascal Francis, Web of Science, Scopus, Engineering Information Database EnCompass LIT (Elsevier), and INSPEC. This wide coverage facilitates the dissemination of the journal's content to a global audience interested in process safety and environmental engineering.