International Journal of Refrigeration-revue Internationale Du Froid最新文献

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Thermodynamic analysis and optimization of an ejector refrigeration system for sustainable cooling applications
IF 3.5 2区 工程技术
International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-04-01 DOI: 10.1016/j.ijrefrig.2025.03.004
Nawel Khaldi, Safa Sdiri, Mariem Lazaar
{"title":"Thermodynamic analysis and optimization of an ejector refrigeration system for sustainable cooling applications","authors":"Nawel Khaldi,&nbsp;Safa Sdiri,&nbsp;Mariem Lazaar","doi":"10.1016/j.ijrefrig.2025.03.004","DOIUrl":"10.1016/j.ijrefrig.2025.03.004","url":null,"abstract":"<div><div>Leveraging low-grade waste heat as an energy source has gained significant interest in recent years. Among the promising technologies for this purpose, heat-driven ejector refrigeration systems have emerged as potential solutions for industrial and commercial cooling applications. While these systems hold significant potential, their widespread adoption has been hindered by relatively low coefficients of performance (COP) and the use of environmentally harmful refrigerants.</div><div>This study aims to investigate and optimize ejector refrigeration systems to enhance energy efficiency and ensure sustainable cooling solutions. It involves evaluating the influence of operating parameters and refrigerant selection on system performance, modeled using the Engineering Equation Solver (EES). A comparative analysis of the refrigerants R134a and the environmentally friendly R1234yf is conducted, focusing on key parameters to identify optimal system conditions. Our findings reveal that condensation and evaporation temperatures are crucial factors influencing system performance. While both R134a and R1234yf exhibit similar trends, R1234yf demonstrates superior entrainment ratios under specific operating conditions, making it a promising alternative for sustainable refrigeration systems.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"174 ","pages":"Pages 372-387"},"PeriodicalIF":3.5,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dispersion stability and thermal conductivity of modified ZnO/HFE-7100 nano-coolant
IF 3.5 2区 工程技术
International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-03-26 DOI: 10.1016/j.ijrefrig.2025.03.039
Yuxin Yang , Rixin Zhang , Rui Liang , Yike Gao , Chenyang Zhang , Junwei Cui , Shengshan Bi
{"title":"Dispersion stability and thermal conductivity of modified ZnO/HFE-7100 nano-coolant","authors":"Yuxin Yang ,&nbsp;Rixin Zhang ,&nbsp;Rui Liang ,&nbsp;Yike Gao ,&nbsp;Chenyang Zhang ,&nbsp;Junwei Cui ,&nbsp;Shengshan Bi","doi":"10.1016/j.ijrefrig.2025.03.039","DOIUrl":"10.1016/j.ijrefrig.2025.03.039","url":null,"abstract":"<div><div>In this work, ZnO nanoparticle was surface modified with the PFPE-acid as ligand. The modified ZnO particle size was about 30 nm measured by SEM. The modified ZnO/HFE-7100 nano-coolants with mass fractions of 0.10 % - 0.40 % were prepared and characterized, and their dispersion stabilities were evaluated by visual sedimentation and UV spectrophotometer. Then the thermal conductivities of these nano-coolants were measured using a visualized transient hot-wire system. Results show that the thermal conductivity of the modified ZnO/HFE-7100 nano-coolants increased with the increasing mass fraction of nanoparticles and temperature, and 4.94 %-16.24 % enhancement were found compared to the base fluid. Based on the experimental data, a thermal conductivity model of nano-coolant was developed, and the deviation of the calculated thermal conductivity from the experimental value was less than ± 1.10 %.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"175 ","pages":"Pages 39-46"},"PeriodicalIF":3.5,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Energy consumption prediction of cold storage based on LSTM with parameter optimization
IF 3.5 2区 工程技术
International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-03-25 DOI: 10.1016/j.ijrefrig.2025.03.033
Yabo Wang , Junhao Chen , Bo Cao , Xinghua Liu , Xingjian Zhang
{"title":"Energy consumption prediction of cold storage based on LSTM with parameter optimization","authors":"Yabo Wang ,&nbsp;Junhao Chen ,&nbsp;Bo Cao ,&nbsp;Xinghua Liu ,&nbsp;Xingjian Zhang","doi":"10.1016/j.ijrefrig.2025.03.033","DOIUrl":"10.1016/j.ijrefrig.2025.03.033","url":null,"abstract":"<div><div>In refined energy management, accurate energy consumption prediction is crucial for fault diagnosis, optimizing system operations based on peak electricity prices, and reducing costs. This study proposes a short-term energy consumption prediction model for cold storage refrigeration systems based on Long Short-Term Memory (LSTM) neural networks. Tailored to the load features of cold storage, the model incorporates compressor unit operating features and air cooler features specific to cold storage factors, rarely addressed in other refrigeration scenarios, as inputs and replaces personnel activity features with time features. This allows the model to predict energy consumption for the next hour while analyzing the impact of each feature on model performance. Results show that compressor unit operating features and air cooler features are essential for prediction accuracy; without these features, the model's R² is only 0.739 and 0.854. Furthermore, compared to models like CNN, BILSTM, and GRU, the LSTM model demonstrates a significant advantage in predictive accuracy, with R² improved by 0.306 to 0.475, confirming its efficiency and reliability in cold storage energy consumption prediction. By introducing an LSTM model that incorporates specific features of cold storage, this study achieves an innovative breakthrough in prediction accuracy for high-energy-consumption cold storage, laying a solid foundation for energy management applications in this field.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"175 ","pages":"Pages 12-24"},"PeriodicalIF":3.5,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Tuning the sound characteristics of flow-induced noise generated in a refrigeration system
IF 3.5 2区 工程技术
International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-03-24 DOI: 10.1016/j.ijrefrig.2025.03.035
Weixing Yang , Wenbin Zhang , Jilai Cao , Maoxun Sun
{"title":"Tuning the sound characteristics of flow-induced noise generated in a refrigeration system","authors":"Weixing Yang ,&nbsp;Wenbin Zhang ,&nbsp;Jilai Cao ,&nbsp;Maoxun Sun","doi":"10.1016/j.ijrefrig.2025.03.035","DOIUrl":"10.1016/j.ijrefrig.2025.03.035","url":null,"abstract":"<div><div>Refrigeration equipment is extensively utilized in residential, commercial and industrial applications, but the issue of flow-induced noise problems remains a tragic problem. The jet flow noises generated by refrigerants have drawn considerable attentions in noise control engineering to mitigate acoustic instability. The jet flow and phase transition in mufflers can lead to flow separation and vortex shedding, resulting in a substantial decrease in acoustic attenuation performances. In this work, the acoustic attenuation performances of a novel acoustic muffler used at the junction between capillary and evaporator were systematically investigated. The proposed acoustic muffler can weaken the jet flow noise by damping the vortices and flow oscillations with an enhanced design, which exhibits superior attenuation performances with the jet flow Mach Number from 0 to 0.15. Compared to the multi-stage pipes under the identical operating condition, the sound pressure level of the improved acoustic muffler exhibits a reduction of average 10 dBA within the frequency range of 1000 Hz to 4500Hz. The results show outstanding noise-attenuation performance and may inspire the development of highly efficient and broadband acoustic mufflers for weakening the jet flow noise in refrigeration systems.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"175 ","pages":"Pages 1-11"},"PeriodicalIF":3.5,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Energy utilization of CO2 thermal management system for electric vehicles in cold climate: Assessment of different heat source modes
IF 3.5 2区 工程技术
International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-03-21 DOI: 10.1016/j.ijrefrig.2025.03.025
Haixu Teng , Ming Li , Jun Wang , Shuangyuan Xiong , Chunhong Lu , Zhanzhuo Song , Haikang Chen , Yan Jiang
{"title":"Energy utilization of CO2 thermal management system for electric vehicles in cold climate: Assessment of different heat source modes","authors":"Haixu Teng ,&nbsp;Ming Li ,&nbsp;Jun Wang ,&nbsp;Shuangyuan Xiong ,&nbsp;Chunhong Lu ,&nbsp;Zhanzhuo Song ,&nbsp;Haikang Chen ,&nbsp;Yan Jiang","doi":"10.1016/j.ijrefrig.2025.03.025","DOIUrl":"10.1016/j.ijrefrig.2025.03.025","url":null,"abstract":"<div><div>To further improve the heating energy efficiency at low temperatures, this study analyzes the feasibility of a CO<sub>2</sub> electric vehicle (EV) utilizing different heat source (air source, waste heat-only, and dual-source) modes under low-temperature conditions. Initially, the difference in heating energy efficiency between air source and waste heat-only modes was compared at different supply air temperatures of -10°C. Concurrently, the dual heat source mode was evaluated at -20°C, emphasizing the impact of the electronic expansion valve 3 (EEV3) opening on heating performance at different constant coolant temperatures. This study presents an evaluation method for heating performance, and the temperature rise characteristics of a real vehicle in air source mode at -20°C are validated through environmental chamber experiments. The results indicate that the inner gas cooler outlet refrigerant temperature strongly correlates with the maximum heating capacity. When the supply air temperature is set to 50°C, the compressor power consumption in the waste heat-only mode decreases by 12.9 % compared with the air source mode, and the COP increases by 13.5 %. As the supply air temperature rises, the efficiency improvements of the COP gradually decrease. Compared with the air source mode, the heating capacity of the dual heat source mode increased by 6.4 %-19.2 %, the COP improved by 4.5 %-5.7 %, and the driving range improved by 9.4 %-15.6 %. This study demonstrates that the thermal management system can meet the temperature rise characteristics, and the maximum outlet air temperature of the air source mode reaches 56.83°C at -20°C.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"174 ","pages":"Pages 359-371"},"PeriodicalIF":3.5,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Exergy-energy, economic and environmental evaluation of a solid oxide fuel cell based trigeneration system using double effect vapor absorption refrigeration system
IF 3.5 2区 工程技术
International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-03-21 DOI: 10.1016/j.ijrefrig.2025.03.029
Yunis Khan , Pawan Kumar Singh , Aftab Anjum , K.K. Sivakumar , Shikha Gupta , Subhash Mishra
{"title":"Exergy-energy, economic and environmental evaluation of a solid oxide fuel cell based trigeneration system using double effect vapor absorption refrigeration system","authors":"Yunis Khan ,&nbsp;Pawan Kumar Singh ,&nbsp;Aftab Anjum ,&nbsp;K.K. Sivakumar ,&nbsp;Shikha Gupta ,&nbsp;Subhash Mishra","doi":"10.1016/j.ijrefrig.2025.03.029","DOIUrl":"10.1016/j.ijrefrig.2025.03.029","url":null,"abstract":"<div><div>In this work, a heat recovery steam generator (HRSG) and double-effect absorption refrigeration system (DVARS) have been implemented in conventional hybrid solid oxide fuel cell (SOFC)-gas turbines (GT) for applications like power generation, steam production, and cooling effects for industrial purposes. The performance of the proposed trigeneration system has been evaluated numerically on the basis of thermodynamic, economic, and environmental aspects using engineering equation software. The results show that by implementing the HRSG and DVARS in the conventional SOFC-GT system, energy efficiency, exergy efficiency, and the total cost of the proposed trigeneration plant (SOFC-GT-HRSG-DVARS) were enhanced by 36.51 %, 4.14 %, and 1.76 %, respectively. Additionally, cooling effects of 100 kW were obtained from the DVARS at 5 °C for general-purpose applications, and heating effects of 101.4 kW were obtained through the HRSG by generating saturated steam. However, the CO<sub>2</sub> emission per MWh of output energy was reduced by 26.73 %.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"174 ","pages":"Pages 343-358"},"PeriodicalIF":3.5,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Experimental improvement of a CO2 transcritical cycle using parallel compressor and integrated subcooler
IF 3.5 2区 工程技术
International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-03-20 DOI: 10.1016/j.ijrefrig.2025.03.019
R. Larrondo-Sancho, D. Sánchez, R. Cabello
{"title":"Experimental improvement of a CO2 transcritical cycle using parallel compressor and integrated subcooler","authors":"R. Larrondo-Sancho,&nbsp;D. Sánchez,&nbsp;R. Cabello","doi":"10.1016/j.ijrefrig.2025.03.019","DOIUrl":"10.1016/j.ijrefrig.2025.03.019","url":null,"abstract":"<div><div>Due to the low critical temperature of Carbon Dioxide (CO<sub>2</sub>), the simplest CO<sub>2</sub> transcritical refrigeration cycle is usually upgraded with different configurations to enhance the performance, increase the cooling capacity, and reduce the flash-gas generated during the expansion process. Considering this, different arrangements were proposed over time with excellent results but rarely compared in a unique refrigeration plant. The present work experimentally analyses and compares three-cycle arrangements for CO<sub>2</sub> transcritical cycles, adding an internal heat exchanger (IHX), a parallel compressor, and an integrated subcooler.</div><div>Taking the IHX arrangement as a reference, the parallel compression and the integrated subcooler are compared at the heat rejection temperatures of 20, 27, and 34°C for commercial refrigeration purposes. The combination of parallel compressor and IHX provides maximum coefficient of performance (COP) and cooling capacity improvements of 3.6 % and 18.5 %, respectively, while the combination of integrated subcooler and IHX boosts the COP and the cooling capacity by up to 11.0 % and 19.5 %, respectively. The results demonstrate the convenience of using these configurations, fairly comparing arrangements with the same refrigerating plant.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"175 ","pages":"Pages 63-73"},"PeriodicalIF":3.5,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143760892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Novel concept of magnetocaloric heat pipe and its micro-unit regeneration cycle
IF 3.5 2区 工程技术
International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-03-17 DOI: 10.1016/j.ijrefrig.2025.03.024
Fucheng Chen, Jianghong Wu
{"title":"Novel concept of magnetocaloric heat pipe and its micro-unit regeneration cycle","authors":"Fucheng Chen,&nbsp;Jianghong Wu","doi":"10.1016/j.ijrefrig.2025.03.024","DOIUrl":"10.1016/j.ijrefrig.2025.03.024","url":null,"abstract":"<div><div>Magnetocaloric Refrigeration (MR) presents a viable alternative to the Vapor Compression Cycle (VCC). The Active Magnetic Regenerator (AMR) has thus far been hindered by challenges related to low operational frequencies and inadequate heat transfer coefficients. The Micro-Unit Regeneration (MUR) cycle demonstrates nearly flawless performance within the caloric thermodynamic cycle, but its fully solid-state prototype suffers from extremely low thermal conductivity, rendering it impractical for real-world applications. This paper introduces a novel concept of Magnetocaloric Heat Pipe (MCHP). It integrates Magnetocaloric Effect (MCE) with phase change heat transfer to enhance heat transfer efficiency between Magnetocaloric Materials (MCMs). A MCHP-MUR cycle for magnetic heat pump is developed, a small temperature difference between micro-unit of MCMs drives the evaporation-condensation phase change heat regeneration. Additionally, a thermal resistance model of the MCHP unit and multi-stage MUR cycle are constructed for performance evaluation at 1.5 T magnetic intensity. Experimental results indicate that the heat transfer process, characterized by a small temperature difference of 4.0 K, can be completed and reach equilibrium within 0.5 s, which is a 99 % reduction in equilibrium time compared to solid-state heat conduction. A system temperature span of 3.2 K was attained in basic two-stage MCHP-MUR cycle. In numerical simulations, a dual 16-stage MCHP-MUR cycle demonstrated a maximum no-load temperature span of 25.3 K and a peak heating capacity of 3.5 W g<sup>-1</sup> at zero temperature span. The paper also offers recommendations and discussions that may inform the design and optimization of the innovative MCHP-MUR cycle.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"175 ","pages":"Pages 25-38"},"PeriodicalIF":3.5,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on the energy performance of a multi-mode split evaporative-cooling hybrid air-conditioning system
IF 3.5 2区 工程技术
International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-03-16 DOI: 10.1016/j.ijrefrig.2025.03.022
Yang Yang , Jun Zeng , Boyu Yang , Junsong Hu , Ziyan Zhang
{"title":"Study on the energy performance of a multi-mode split evaporative-cooling hybrid air-conditioning system","authors":"Yang Yang ,&nbsp;Jun Zeng ,&nbsp;Boyu Yang ,&nbsp;Junsong Hu ,&nbsp;Ziyan Zhang","doi":"10.1016/j.ijrefrig.2025.03.022","DOIUrl":"10.1016/j.ijrefrig.2025.03.022","url":null,"abstract":"<div><div>Reducing energy consumption in buildings is a crucial component in the pursuit of carbon neutrality and sustainable social development. The air-conditioning systems account for a significant portion of a building's energy consumption and therefore require special attention to their energy efficiency. These air-conditioning systems that incorporate indirect evaporative cooling (IEC) technology are a viable energy-saving strategy. However, these hybrid systems are mainly designed for hot-dry climates, and limited research has focused on the coupling advantages of condenser pre-cooling and reheating energy recovery via IEC through different operating modes. In this paper, a novel multi-mode split evaporative-cooling hybrid air-conditioning system (MVC-IEC) is proposed, which utilizes the IEC cycle to achieve condenser pre-cooling and supply air reheating. Simultaneously, it features five operating modes to adapt to the changing ambient climatic conditions. Subsequently, the energy performance of the MVC-IEC system was primarily investigated under different operating conditions. The MVC-IEC demonstrates a more pronounced energy-saving advantage under high temperature, medium-low humidity and low reheat load conditions. In addition, the MVC-IEC has acceptable application potential in both hot-humid and hot-dry cities (Changsha, Nanjing, Zhengzhou and Xi'an). The seasonal COP for the MVC-IEC is reached by 3.9 − 4.6. And compared with MVC<img>HRC, the MVC-IEC achieves an energy-saving rate of 10.8 − 16.3 % and reduces carbon emissions by 0.42−0.80 kg/year.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"174 ","pages":"Pages 217-231"},"PeriodicalIF":3.5,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Performance evaluation of ejector-enhanced and gas-bearing-assisted vapor compression chilled water system
IF 3.5 2区 工程技术
International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-03-14 DOI: 10.1016/j.ijrefrig.2025.03.009
Shicheng Ying, Hang Yin, Guangbin Liu, Qichao Yang, Yuanyang Zhao, Liansheng Li
{"title":"Performance evaluation of ejector-enhanced and gas-bearing-assisted vapor compression chilled water system","authors":"Shicheng Ying,&nbsp;Hang Yin,&nbsp;Guangbin Liu,&nbsp;Qichao Yang,&nbsp;Yuanyang Zhao,&nbsp;Liansheng Li","doi":"10.1016/j.ijrefrig.2025.03.009","DOIUrl":"10.1016/j.ijrefrig.2025.03.009","url":null,"abstract":"<div><div>The centrifugal compressor with gas bearings is an important research direction of chiller, but the essential additional gas cycle for bearing and motor cooling still lead to the energy waste. Using an ejector to increase this gas pressure by recovering the energy of expansion process for inter-stage replenishment is a feasible solution. In this paper, a mathematical model of EGVC system (ejector-enhanced gas-bearing-assisted vapor compression chilled water system) is established and simulated comparing to the BGVC system (basic gas-bearing-assisted vapor compression chilled water system), and the performance under variable working conditions is obtained by 4E (energy, exergy, economic, environmental) analysis method. The results indicate that the ejector can reduce power consumption for gas compression and improving system performance. The COP increases while the exergy efficiency decrease with the evaporating temperature for both systems, but they show opposite changes with condensing temperature. Comparing to BGVC, the COP of EGVC increases by 1.29 %-1.52 % and the exergy efficiency increases by 1.02 %-1.21 % when the evaporating temperature rises from 1 °C to 9 °C, while they increase by 1.41 %-1.63 % and 1.12 %-1.31 % when the condensing temperature increases from 40 °C to 48 °C. The EGVC system is more suitable to the large bearing gas condition, and the COP and exergy efficiency improve by 1.49 %-2.20 % and 1.19 %-1.67 % when the proportion of gas for bearing to the total refrigerant rises from 1 % to 2 %. The cost and carbon emission of system also be reduced by using the ejector.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"174 ","pages":"Pages 185-203"},"PeriodicalIF":3.5,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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