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

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Experimental study on the matching relationship of gas wave oscillation tube under liquid-carrying condition 载液条件下气体波振荡管匹配关系的实验研究
IF 3.5 2区 工程技术
International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-09-18 DOI: 10.1016/j.ijrefrig.2024.09.018
Peiqi Liu , Haitao Wang , Yang Yu , Yiming Zhao , Zewu Wang , Haigui Fan , Dapeng Hu
{"title":"Experimental study on the matching relationship of gas wave oscillation tube under liquid-carrying condition","authors":"Peiqi Liu ,&nbsp;Haitao Wang ,&nbsp;Yang Yu ,&nbsp;Yiming Zhao ,&nbsp;Zewu Wang ,&nbsp;Haigui Fan ,&nbsp;Dapeng Hu","doi":"10.1016/j.ijrefrig.2024.09.018","DOIUrl":"10.1016/j.ijrefrig.2024.09.018","url":null,"abstract":"<div><div>The gas wave oscillation tube (GWOT) transfers energy directly between gases of varying pressures using non-constant motion waves, and its low rotational speed operation offers a broader application potential in two-phase refrigeration compared to turbomachinery. The GWOTs achieve a high performance by optimizing the relationship between tube length, deflection displacement, rotational speed, and incident excitation wave (S1) velocity. However, under the liquid-carrying conditions, the optimizing matching relationship of the GWOTs deviates, leading to a decline in performance, so it is necessary to explore the matching relationship of the high performance of the GWOTs under the liquid-carrying conditions. This study focuses on \"spoon\" GWOTs, analyzing the impact of rotational speed, liquid-carrying capacity, and deflection displacement on their refrigeration performance under a fixed tube length through experimental analysis. It is found that the refrigeration efficiency at the design parameters of the GWOTs decreases by a maximum of about 25 % with the increase in the amount of liquid-carrying capacity within the study area of this paper, while the refrigeration efficiency can be improved by a maximum of about 8 % by varying the rotational speed. The findings provide valuable insights for enhancing the liquid-carrying performance of the GWOTs and promoting the application expansion of GWOTs in the field of gas-liquid two-phase.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142428044","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
Evaluation and development of flow condensation correlations using the data from low GWP refrigerants in an axial micro-fin aluminum tube 利用轴向微鳍铝管中低全球升温潜能值制冷剂的数据,评估和开发流动冷凝相关性
IF 3.5 2区 工程技术
International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-09-18 DOI: 10.1016/j.ijrefrig.2024.09.016
Yifeng Hu, Samuel Fortunato Yana Motta, Cheng-Min Yang
{"title":"Evaluation and development of flow condensation correlations using the data from low GWP refrigerants in an axial micro-fin aluminum tube","authors":"Yifeng Hu,&nbsp;Samuel Fortunato Yana Motta,&nbsp;Cheng-Min Yang","doi":"10.1016/j.ijrefrig.2024.09.016","DOIUrl":"10.1016/j.ijrefrig.2024.09.016","url":null,"abstract":"<div><div>To mitigate global warming, the world is transitioning to refrigerants with low global warming potential (GWP). Supporting this shift requires a model that can accurately predict the heat transfer and pressure drop of new refrigerants, crucial for designing efficient heat exchangers. Existing models, however, are largely based on currently deployed refrigerants and primarily developed for unexpanded micro-fin tubes with spiral angles of 6° to 30°. Their applicability to new refrigerants, especially in expanded micro-fin tubes, is uncertain. This study assesses the performance of four well-known condensation models for six emerging refrigerants—R-32, R-454B, R-454C, R-455A, R-1234yf, and R-1234ze(E)—against experimental data. Initially, the Han and Lee (2005) model shows the best prediction accuracy with a mean absolute deviation (MAD) of 22.1 %. To enhance the accuracy of heat transfer models for new refrigerants and geometries with large temperature glides, two approaches are proposed. The first approach applies a simple correction factor, reducing the MAD of the Cavallini et al. (2009) model from 68.2 % to 15.4 %. The second approach uses the variable metric method for minimization, fitting new constants to the data. This optimization results in the Kedzierski and Goncalves (1997) model achieving the highest accuracy, with a MAD of 13.1 %. For pressure drop models, the Cavallini et al. (1997) model is the most accurate with a MAD of 6.4 %, followed by the Haraguchi et al. (1993) model with a MAD of 9.4 %. Due to its simplicity, the Haraguchi et al. (1993) model is a practical option for predicting frictional pressure drop.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142428510","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
Thermodynamic analysis of a modified two-stage transcritical CO2 refrigeration cycle with an ejector and a subcooler 带喷射器和过冷却器的改进型双级跨临界二氧化碳制冷循环的热力学分析
IF 3.5 2区 工程技术
International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-09-18 DOI: 10.1016/j.ijrefrig.2024.09.019
Huanmin Li, Qiuyue Huang, Jianlin Yu
{"title":"Thermodynamic analysis of a modified two-stage transcritical CO2 refrigeration cycle with an ejector and a subcooler","authors":"Huanmin Li,&nbsp;Qiuyue Huang,&nbsp;Jianlin Yu","doi":"10.1016/j.ijrefrig.2024.09.019","DOIUrl":"10.1016/j.ijrefrig.2024.09.019","url":null,"abstract":"<div><div>In the application scope of large-scale supermarkets, the practicality of transcritical CO<sub>2</sub> refrigeration device has been confirmed to be quite satisfying. A modified two-stage transcritical CO<sub>2</sub> refrigeration cycle with an ejector and a subcooler (MTC) is proposed in this paper. In the modified cycle, the ejector recovers expansion works and reduces irreversible losses in the throttling process. The subcooler provides subcooling degree for the CO<sub>2</sub> entering the low-temperature (LT) evaporator, thus increasing the refrigeration capacity and improving the COP of the modified cycle. Thermodynamic analysis has shown that the exergy efficiency <span><math><mrow><mo>(</mo><msub><mi>η</mi><mrow><mi>e</mi><mi>x</mi></mrow></msub><mo>)</mo></mrow></math></span> and COP of MTC under given operating condition has been enhanced by 13.7 % and 14.2 % compared to BTC. The discharge temperature at the outlet of high-pressure compressor in MTC is decreased by 8.3℃. Under typical operating condition, the optimal discharge pressure of MTC is 9.07 MPa, which is lower than that of BTC. The correlation to calculate optimal discharge pressure for single-stage CO<sub>2</sub> refrigeration cycle is also suitable for MTC under given operating conditions. The MTC has also shown better performance under variable operating conditions. For MTC, when the temperature at the outlet of gas cooler increases from 35 – 45℃, the COP and <span><math><msub><mi>η</mi><mrow><mi>e</mi><mi>x</mi></mrow></msub></math></span> are enhanced by 14.1 % - 16.1 % and 12.8 % - 14.2 % compared to BTC, respectively. When gas cooler outlet pressure decreases from 11.0 to 7.5 MPa, the COP and <span><math><msub><mi>η</mi><mrow><mi>e</mi><mi>x</mi></mrow></msub></math></span> are enhanced by 14.0 % - 22.8 % and 13.4 % - 18.7 %. As the evaporating temperature at the cold side of subcooler increases from -25 to -15℃, the COP and <span><math><msub><mi>η</mi><mrow><mi>e</mi><mi>x</mi></mrow></msub></math></span> increase from 1.82 to 1.98 and 27.4 % to 29.7 %. With the ratio of refrigeration capacity (<span><math><msub><mi>R</mi><mrow><mi>e</mi><mi>c</mi></mrow></msub></math></span>) between medium-temperature evaporator and low-temperature evaporator varies from 0.7 to 1.2, the COP and <span><math><msub><mi>η</mi><mrow><mi>e</mi><mi>x</mi></mrow></msub></math></span> are improved by 10.7 % - 16.3 % and 10.7 % - 15.4 % compared to BTC. There is the maximum exergy loss at gas cooler in the MTC, whereas that of BTC is located in the expansion valve before LT evaporator. The economic analysis shows the cost per unit of exergy of MTC is decreased by 11.5 % under typical operation condition. According to simulation results, the modified cycle has better performance in severe working conditions such as high gas cooler outlet temperature and low gas cooler outlet pressure in the given range of working conditions compared to BTC.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142428513","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
Carbon emission scenario analysis of data centers in China under the carbon neutrality target 碳中和目标下的中国数据中心碳排放情景分析
IF 3.5 2区 工程技术
International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-09-18 DOI: 10.1016/j.ijrefrig.2024.09.017
Feng Zhou , Ruimin Wang , Guoyuan Ma
{"title":"Carbon emission scenario analysis of data centers in China under the carbon neutrality target","authors":"Feng Zhou ,&nbsp;Ruimin Wang ,&nbsp;Guoyuan Ma","doi":"10.1016/j.ijrefrig.2024.09.017","DOIUrl":"10.1016/j.ijrefrig.2024.09.017","url":null,"abstract":"<div><div>The low-carbon transformation of data centers is of great significance to achieve the goals of carbon peaking and carbon neutrality. This study compared and analyzed the overall situation of data centers in China. Based on China's CO<sub>2</sub> emission and intensity targets in key years, the four variables of energy efficiency improvement rate, nonfossil energy consumption proportion, negative emission technology intensity, and waste energy utilization rate were introduced, and a net zero emission path model of data centers was established. Using scenario analysis to predict the total CO<sub>2</sub> emissions and emission intensity from 2021 to 2060, three emission reduction path scenarios were obtained. Results showed that the energy consumption of data centers increased gradually, the carbon emissions first increased and then decreased, and the power usage effectiveness (PUE) of the data centers decreased gradually. The carbon peak time of the three scenarios is 2030, and the time for carbon neutrality is 2055, 2053, and 2051 in three scenarios. The data center industry should further improve the energy efficiency utilization rate, increase the proportion of nonfossil energy consumption, strengthen the technological innovation of carbon capture and storage, enhance the level of carbon sink, and optimize the utilization rate of waste energy.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142441987","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 assessment of a multilayered packed-sphere La–Fe–Si active magnetic regenerator 多层填料球 La-Fe-Si 有源磁性再生器的实验评估
IF 3.5 2区 工程技术
International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-09-17 DOI: 10.1016/j.ijrefrig.2024.09.011
Hígor F. Teza, Bernardo P. Vieira, Paulo V. de Faria, Gislaine Hoffmann, Jaime A. Lozano, Jader R. Barbosa Jr.
{"title":"Experimental assessment of a multilayered packed-sphere La–Fe–Si active magnetic regenerator","authors":"Hígor F. Teza,&nbsp;Bernardo P. Vieira,&nbsp;Paulo V. de Faria,&nbsp;Gislaine Hoffmann,&nbsp;Jaime A. Lozano,&nbsp;Jader R. Barbosa Jr.","doi":"10.1016/j.ijrefrig.2024.09.011","DOIUrl":"10.1016/j.ijrefrig.2024.09.011","url":null,"abstract":"<div><div>This study investigates the performance of a multilayered packed-bed active magnetic regenerator (AMR) using spheroidal particles with first-order magnetocaloric properties. The hydraulic performance is assessed via the interstitial friction factor, showing significant underestimation by the Ergun Equation at high mass flow rates. Coefficient adjustments are made to accurately represent the AMR pressure drop, considering particle nonuniformity and structural components, such as layer mesh dividers. This facilitates the pressure drop modeling and provides a means to check the AMR integrity on a routine basis, without requiring AMR disassembly. The thermal performance, evaluated in terms of the regenerator effectiveness, shows a satisfactory cooling potential for practical applications but emphasizes the need for flow control to prevent effectiveness imbalance between hot and cold flows, crucial for optimal operation. The cooling capacity and maximum temperature span are also evaluated, demonstrating that higher mass flow rates yield higher cooling capacities with lower temperature spans, while lower rates achieve higher spans. Varying the blow fraction shows that regenerators at 50% blow fraction achieve 10% higher cooling capacities than at 37.5%. Increasing operational frequency improves cooling by increasing the number of cycles and reducing losses, resulting in a 15% capacity increase between 0.25 and 0.50 Hz. However, this trend may reverse at higher frequencies beyond the experimental limits. While this study improves the understanding of the hydraulic and thermal performance of packed-bed AMRs, its findings underscore the importance of flow balance and frequency in achieving optimal performance, thus providing insights for future system improvements.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142428485","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
Enhancing efficiency of large cold store refrigeration systems through automated fault identification and intelligent energy optimization 通过自动故障识别和智能能源优化提高大型冷库制冷系统的效率
IF 3.5 2区 工程技术
International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-09-16 DOI: 10.1016/j.ijrefrig.2024.09.002
Zongsheng Zhu , Xinghua Liu , Xiaoming Wang , Bin Liu
{"title":"Enhancing efficiency of large cold store refrigeration systems through automated fault identification and intelligent energy optimization","authors":"Zongsheng Zhu ,&nbsp;Xinghua Liu ,&nbsp;Xiaoming Wang ,&nbsp;Bin Liu","doi":"10.1016/j.ijrefrig.2024.09.002","DOIUrl":"10.1016/j.ijrefrig.2024.09.002","url":null,"abstract":"<div><div>Refrigeration systems in large cold stores frequently operate suboptimally due to component faults, leading to significant energy wastage and high carbon emissions. This study introduces a novel procedure that leverages data mining to automatically analyze and identify faults, thereby enhancing the intelligence of refrigeration equipment. The research focused on abnormal suction temperatures of compressors during the defrosting of air coolers in a large cold store. Through theoretical analysis and key data acquisition, the root cause of defrosting issues was traced to the abnormal operation of gas-powered suction stop valves, causing leakage of high-pressure hot gas. Clustering methods, Self-Organizing Maps (SOM), were utilized to classify system states and achieved high accuracy rates of 88.6 % to 93.8 % for the three fault modes during the defrosting process, respectively. The resolution of defrosting faults resulted in an energy consumption reduction of up to 18.3 %, aligning with global sustainability initiatives. The study also evaluated the carbon emission reduction, providing a comprehensive approach to improving the efficiency and environmental impact of cold store operations.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142428507","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
Effects of solutes and additives on ice growth prevention in ice slurry production 溶质和添加剂对冰浆生产中防止冰生长的影响
IF 3.5 2区 工程技术
International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-09-16 DOI: 10.1016/j.ijrefrig.2024.09.009
Hiroyuki Kumano , Takashi Morimoto , Kohta Tanaka , Toshie Koyama , Masayuki Tanino
{"title":"Effects of solutes and additives on ice growth prevention in ice slurry production","authors":"Hiroyuki Kumano ,&nbsp;Takashi Morimoto ,&nbsp;Kohta Tanaka ,&nbsp;Toshie Koyama ,&nbsp;Masayuki Tanino","doi":"10.1016/j.ijrefrig.2024.09.009","DOIUrl":"10.1016/j.ijrefrig.2024.09.009","url":null,"abstract":"<div><div>Ice slurry is a promising functional fluid with high thermal energy density and high heat transfer rate. However, large ice particles in the ice slurry can cause blocking of tubes during ice slurry flow. Therefore, it is preferable to use fine ice particles to prepare ice slurry in many fields. In this study, ice slurries were generated from supercooled solutions containing additives, such as anti-freeze protein and polyvinyl alcohol, to prevent the increase in the ice particle size in the formation process of the ice slurry. The concentration of the solute and amount of the additive were varied as experimental parameters, and the size of the ice particles was evaluated. The average area of the ice particles decreased with the addition of the additives. In particular, anti-freeze protein was effective for generating fine ice particles in the ice slurry. However, the effects of the additives became weaker for higher concentration of the solute, and the size of the ice particles was almost the same regardless of the concentration of the solute and the amount of the additive. Moreover, it was found that particular properties, such as the freezing-point depression, kinematic viscosity of the solution, and effective latent heat of fusion, did not affect the size of the ice particles in the ice slurry generation process.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142428368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Frost crystal growth behavior on a hydrophilic surface over a wide range of cold surface temperature 大范围冷表面温度下亲水表面的结霜晶体生长行为
IF 3.5 2区 工程技术
International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-09-14 DOI: 10.1016/j.ijrefrig.2024.09.014
Yanxia Li, Zhenqiang Wang, Zhongliang Liu, Shengyuan Zhao
{"title":"Frost crystal growth behavior on a hydrophilic surface over a wide range of cold surface temperature","authors":"Yanxia Li,&nbsp;Zhenqiang Wang,&nbsp;Zhongliang Liu,&nbsp;Shengyuan Zhao","doi":"10.1016/j.ijrefrig.2024.09.014","DOIUrl":"10.1016/j.ijrefrig.2024.09.014","url":null,"abstract":"<div><div>The initial frosting phenomenon is a discontinuous phase nucleation process, the cold surface temperature and properties have a decisive influence on this phenomenon, especially in the initial frosting stage. With the development of aerospace and energy transportation technology, frost formation at low temperatures (-100 °C∼-30 °C) and ultra-low temperatures (-273 °C∼-100 °C) has gradually attracted the attention of researchers. In this paper, the initial frosting phenomena on hydrophilic surfaces with a contact angle of 10° (CA= 10°) and ordinary (CA= 95°) surfaces are studied experimentally in a wide range of cold surface temperatures (-190 °C∼-30 °C). Four modes are confirmed: cold surface condensation frosting, cold surface sublimation frosting, air boundary layer condensation frosting and air boundary layer sublimation frosting. It is also found that the four frosting modes do not appear in turn with the decrease of the cold surface temperature, but two or more frosting modes appear at the same time. And the surface contact angle has an important influence on the frosting mode. The initial frost crystal morphology mainly depends on the cold surface temperature and the corresponding frosting mode. Four different forms of frost crystals are observed: hexagonal prism (feather), branch (pine needle), cluster (shrub) and floc (grape), in which the cluster frost crystal is more sensitive to the surface contact angle and can appear in different temperature ranges due to different contact angles. Based on the statistics of the size, quantity, and distribution of the initial frost crystals, it is found that -70 °C is a major turning point for frost formation from the cold surface sublimation frosting to the air boundary layer sublimation frosting, and an important change has taken place near this point. Furthermore, it affects the shape and size distribution of frost crystals. These findings are of great significance for the study and understanding of frost crystal growth mechanism in the initial stage of frost formation at low and ultra-low temperatures.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142322673","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
A model-based design approach for low-pressure axial fan blades considering the air flow system characteristics 考虑气流系统特性的低压轴流风扇叶片模型设计方法
IF 3.5 2区 工程技术
International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-09-13 DOI: 10.1016/j.ijrefrig.2024.09.003
Gabriel L. Podgaietsky , Adriano F. Ronzoni , Christian J.L. Hermes
{"title":"A model-based design approach for low-pressure axial fan blades considering the air flow system characteristics","authors":"Gabriel L. Podgaietsky ,&nbsp;Adriano F. Ronzoni ,&nbsp;Christian J.L. Hermes","doi":"10.1016/j.ijrefrig.2024.09.003","DOIUrl":"10.1016/j.ijrefrig.2024.09.003","url":null,"abstract":"<div><div>The paper puts forward a computer methodology for designing low-pressure axial fan blades for small-capacity refrigeration applications. Based on the blade element theory (BET), the airfoil efficiency of the airfoil, the principles of mass and momentum conservation together with empirical correlations for the flow irreversibilities, a mathematical model was devised for screening the blade geometric parameters (e.g., radial chord and pitch variation, and hub radius) by varying the induction coefficient distribution for a given fan diameter, motor speed, and airflow system characteristic curve. The best blade configuration is selected by means of a tailor-made optimization algorithm and undergoes a series of linear transformations for translating the fan parametrization into a CAD drawing. Two new fan blades were designed, one for maximum blade efficiency (MBE) and another for maximum airflow rate (MAR). In comparison with the free-swirl design approach, a standard procedure adopted in the open literature, the proposed blades showed an efficiency and an airflow by 20 % (MBE) and 14 % (MAR) higher than the reference. The airflow characteristics of the new designs were also assessed by means of wind-tunnel testing, which confirmed an increase of 11 % in the case of MBE design, while an enhancement of 10 % was observed in the case of MAR design.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142428512","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
Simulation of diffusion of combustible refrigerants R1234yf and R290 leakage in automotive air conditioning 汽车空调中可燃制冷剂 R1234yf 和 R290 泄漏的扩散模拟
IF 3.5 2区 工程技术
International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-09-13 DOI: 10.1016/j.ijrefrig.2024.09.012
Linlin Wang , Yu He , Jiabao Ren , Dan Wang , Baomin Dai , Zhe Zhang
{"title":"Simulation of diffusion of combustible refrigerants R1234yf and R290 leakage in automotive air conditioning","authors":"Linlin Wang ,&nbsp;Yu He ,&nbsp;Jiabao Ren ,&nbsp;Dan Wang ,&nbsp;Baomin Dai ,&nbsp;Zhe Zhang","doi":"10.1016/j.ijrefrig.2024.09.012","DOIUrl":"10.1016/j.ijrefrig.2024.09.012","url":null,"abstract":"<div><div>Electric vehicles that utilize a heat pump system have a refrigerant charge increase of at least 400 g compared to traditional fuel vehicle air conditioning systems. If combustible refrigerants are used, the risk of combustion increases when the refrigerant leaks and spreads to the passenger compartment. This paper dynamically monitored the volume concentrations of combustible refrigerants R1234yf and R290 as they leaked and entered the passenger compartment accompanied by air supply by numerical simulation. The results indicated that refrigerants are more prone to accumulate in the rear row than in the front. After a leak, the average volume concentration of R1234yf at the four air outlets was 1.58 %, and 3.36 % for R290. at the breathing points of four passengers, the average volume concentration was 0.99 % for R1234yf and 2.39 % for R290. Near the feet of the passengers, the average volume concentration was 0.95 % for R1234yf and 2.27 % for R290. The highest volume concentration of R1234yf in the passenger compartment was below its LFL, whereas all monitoring points for R290 exceeded its LFL. Compared to experimental data, the difference in maximum refrigerant volume concentration was approximately 1.2 %.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142428045","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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