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

Numerical simulation of flow and heat transfer characteristics of microchannels with ribbed structures of bionic fish fins 仿生鱼鳍肋状微通道流动与传热特性的数值模拟

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-07-12 DOI: 10.1016/j.ijrefrig.2025.07.012

Chenlei Zhao, Lijuan He, WenXi You, XinYu Meng, Zhi Li

{"title":"Numerical simulation of flow and heat transfer characteristics of microchannels with ribbed structures of bionic fish fins","authors":"Chenlei Zhao, Lijuan He, WenXi You, XinYu Meng, Zhi Li","doi":"10.1016/j.ijrefrig.2025.07.012","DOIUrl":"10.1016/j.ijrefrig.2025.07.012","url":null,"abstract":"<div><div>In order to improve the heat dissipation performance and comprehensive performance, a new type of bionic fish fin-rib microchannel heat sink is designed. The microchannel heat sink adopts symmetrical fish fin sidewalls and contains rectangular ribs in the channel. In this paper, the flow and heat transfer characteristics of smooth linear microchannels (MC), rectangular-rib smooth linear microchannels (MC-RP), fish fin microchannels (FN) and fish fin-rib microchannels (FN-RP) are studied by numerical methods, and the influence mechanism of the composite structure of micro-ribs and fish fin channels on the flow and heat transfer performance enhancement of microchannel heat exchangers is explored. The results show that the comprehensive evaluation coefficient of the fish fin-rib microchannel is the best among the four channels, reaching 1.82 at <em>Re</em> = 800. The effects of rectangular, diamond, teardrop- shaped and fish fin-shaped ribs on the microchannel are further studied, and the fish fin ribs are the best.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"178 ","pages":"Pages 298-311"},"PeriodicalIF":3.5,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144656970","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

Assessment of refrigerant emissions from air conditioners in Brazil 巴西空调制冷剂排放评估

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-07-10 DOI: 10.1016/j.ijrefrig.2025.07.010

Conrado Augustus De Melo

{"title":"Assessment of refrigerant emissions from air conditioners in Brazil","authors":"Conrado Augustus De Melo","doi":"10.1016/j.ijrefrig.2025.07.010","DOIUrl":"10.1016/j.ijrefrig.2025.07.010","url":null,"abstract":"<div><div>Refrigerant fluids have a high global warming potential and consequently contributes to maintaining high levels of radiative forcing into the atmosphere. This paper aims to present knowledge regarding the conditions of refrigerant emissions from leakage and disposal of air conditioners in the Brazilian household sector. There is a significant grow in the ownership of air conditioners and it represents an increase in emissions of hydrochlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs) that are used in air conditioners that operate in the country. A methodological approach is developed and applied to estimate the current emissions and to simulate scenarios where each refrigerant and its respective global warming potential is accounted. Additionally, the impacts of the Kigali amendment and the current regulations are assessed. The main finding is that the ratification of the Kigali amendment should reduce the refrigerant emissions from 2.8 million tons of CO<sub>2e</sub> in 2024 to 1.2 million tons of CO<sub>2e</sub> in 2050. Moreover, is also verified the need of further developments in promoting training, certifications and regulations in order to promote a more effective reverse logistic to recover and recycle refrigerants in servicing and disposal of air conditioners. New surveys and scientific researches also are recommended to tackle the lack of data and statistics related to refrigerants leakage in Brazil and to provide innovative solutions to minimize this source of emissions.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"178 ","pages":"Pages 280-288"},"PeriodicalIF":3.5,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144634440","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 evaluation of nanorefrigerant-enhanced cascade refrigeration system 纳米制冷剂增强级联制冷系统的热力学评价

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-07-09 DOI: 10.1016/j.ijrefrig.2025.07.009

Hande Ufat

引用次数: 0

Numerical analysis on ejector performance with varying geometric parameters of chevrons 不同形线几何参数下喷射器性能的数值分析

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-07-08 DOI: 10.1016/j.ijrefrig.2025.06.028

Gokhul K. , S. Soma Sundaram

{"title":"Numerical analysis on ejector performance with varying geometric parameters of chevrons","authors":"Gokhul K. , S. Soma Sundaram","doi":"10.1016/j.ijrefrig.2025.06.028","DOIUrl":"10.1016/j.ijrefrig.2025.06.028","url":null,"abstract":"<div><div>The entrainment ratio of the ejector in an ejector refrigeration system (ERS) directly depends on the mixing between the primary fluid (generator) and the secondary fluid (evaporator). In this analysis, the effect of variation of chevron tip angle <span><math><mi>β</mi></math></span> for a fixed number of chevrons N on the entrainment ratio has been studied. The analysis has been conducted in a steady state by solving the compressible and turbulence equations and rotational periodic boundary conditions with water vapor as the working fluid. The shear layer thickness for the chevron tip angle 60° is not only higher but also conserved downstream, resulting in the highest entrainment ratio of 0.4705. The variation of secondary fluid flow angle for different chevron tip angles is a significant parameter for the increment in the entrainment ratio. Also, the optimum L/D<span><math><mtext>%</mtext></math></span> for the given working and geometry conditions lies within the range of 68% <span><math><mrow><mo>±</mo><mspace></mspace><mn>5</mn><mtext>%</mtext></mrow></math></span> for all numbers of chevrons. There has been no improvement in the entrainment ratio with the variation in the penetration angle <span><math><mi>α</mi></math></span>.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"178 ","pages":"Pages 180-191"},"PeriodicalIF":3.5,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144595621","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

Polyalphaolefin-based SiO2 nanolubricants: Thermo-physical and tribology investigations for electric vehicle air-conditioning system 聚烯烃基SiO2纳米润滑剂：电动汽车空调系统的热物理和摩擦学研究

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-07-05 DOI: 10.1016/j.ijrefrig.2025.07.008

N.N.M. Zawawi , W.H. Azmi , A.R.M. Aminullah , Hafiz Muhammad Ali

{"title":"Polyalphaolefin-based SiO2 nanolubricants: Thermo-physical and tribology investigations for electric vehicle air-conditioning system","authors":"N.N.M. Zawawi , W.H. Azmi , A.R.M. Aminullah , Hafiz Muhammad Ali","doi":"10.1016/j.ijrefrig.2025.07.008","DOIUrl":"10.1016/j.ijrefrig.2025.07.008","url":null,"abstract":"<div><div>The polyalphaolefins (PAO) lubricant oil exhibits promising potential as a substitute for lubricants used in electric vehicle air-conditioning systems employing R134a and R1234yf. This paper presents an experimental study on PAO lubricant’s thermo-physical and tribological properties when dispersed with SiO<sub>2</sub> nanoparticles. The dispersion of SiO<sub>2</sub> nanoparticles in the PAO lubricant was achieved using a two-step method, with volume concentrations ranging from 0.01 % to 0.10 %. The SiO<sub>2</sub>/PAO nanolubricants were visually observed, and their thermal conductivity, dynamic viscosity, coefficient of friction (COF), and wear scar diameter (WSD) were evaluated using appropriate instruments. The study found that the SiO<sub>2</sub>/PAO nanolubricant exhibited excellent stability, as indicated by a zeta potential value of over 60 mV. Additionally, a minimal amount of sedimentation was observed during the visual examination after 30 days of preparation. The SiO<sub>2</sub> nanolubricant exhibited a thermal conductivity of 4.42 % higher and a viscosity that is 8.72 % higher compared to pure PAO lubricant. The COF reduction exhibited the maximum value at 17.33 %, while the friction torque reduction reached its lowest value at 1.47 %. In conclusion, the SiO<sub>2</sub> nanoparticles significantly impact the PAO lubricant’s tribological properties, reducing friction and wear while improving the thermal conductivity with little drawback with viscosity increment.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"178 ","pages":"Pages 203-214"},"PeriodicalIF":3.5,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144604646","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

Solid-state magnetic refrigerator based on the demagnetizing effect 基于消磁效应的固态磁制冷机

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-07-05 DOI: 10.1016/j.ijrefrig.2025.06.022

C.R. Fernandes , R. Almeida , J.S. Amaral , J.H. Belo , J.O. Ventura , D.J. Silva

{"title":"Solid-state magnetic refrigerator based on the demagnetizing effect","authors":"C.R. Fernandes , R. Almeida , J.S. Amaral , J.H. Belo , J.O. Ventura , D.J. Silva","doi":"10.1016/j.ijrefrig.2025.06.022","DOIUrl":"10.1016/j.ijrefrig.2025.06.022","url":null,"abstract":"<div><div>With population growth, changes in lifestyle and global warming, the demand for ecological and low-energy consumption technologies is rising sharply. Magnetic refrigeration is a promising alternative to conventional refrigeration. However, several factors still impair its performance, thereby delaying commercialization. The use of thermal management elements (such as thermal switches) instead of thermal fluids for heat transfer can avoid some of the main issues arising from conduction/convection, fluid oscillation and mechanical friction. Furthermore, the rotating magnetocaloric effect can effectively solve the problem of the demagnetizing field commonly associated with this technology. Therefore, here we propose and numerically simulate a novel solid-state magnetic refrigerator based on the rotating magnetocaloric effect, generated by the alternated rotation of magnetocaloric material plates under a constant magnetic field. The performance of the proposed device improves with the decrease in the inverse aspect ratio of the magnetocaloric material plates, reaching a maximum no-load temperature span of 2.02 K. The implementation of asymmetric cycles can lead to enhancements of up to 30% in the temperature span, which compensates the use of low-intensity magnetic fields in future applications. This innovative and compact model enables the development of a novel class of magnetic refrigerators based on the rotating magnetocaloric effect.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"178 ","pages":"Pages 272-279"},"PeriodicalIF":3.5,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144631532","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

Numerical study on helium condensation in supersonic nozzles of various structures 不同结构超声速喷嘴内氦凝聚的数值研究

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-07-05 DOI: 10.1016/j.ijrefrig.2025.07.003

Baosheng Chen , Shoucheng Cui , Nan Peng , Ercang Luo

引用次数: 0

Efficient utilization of energy enabled by form stable brine phase change cold storage gels with ultra-high latent heat towards green, safe and cost-effective fruit cold chain 高效利用能量，形成具有超高潜热的稳定盐水相变冷库凝胶，走向绿色、安全、经济的水果冷链

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-07-04 DOI: 10.1016/j.ijrefrig.2025.07.006

Shiya Lin, Yiqi Xie, Xianyang Chen, Pengcheng Lin, Ying Chen

{"title":"Efficient utilization of energy enabled by form stable brine phase change cold storage gels with ultra-high latent heat towards green, safe and cost-effective fruit cold chain","authors":"Shiya Lin, Yiqi Xie, Xianyang Chen, Pengcheng Lin, Ying Chen","doi":"10.1016/j.ijrefrig.2025.07.006","DOIUrl":"10.1016/j.ijrefrig.2025.07.006","url":null,"abstract":"<div><div>Advanced cold chain systems are essential for maintaining nutritional integrity and reducing spoilage in perishable fruits. However, conventional mechanical refrigeration incurs considerable energy consumption and operational costs. This study introduces a green, safe, and cost-effective alternative—Brine Phase Change Cold Storage Gels (BPCCSGs). With a low phase change temperature (−11.29 °C), high latent heat (242.14 J·g⁻¹), and elevated thermal conductivity (0.835 W·m⁻¹·K⁻¹), BPCCSGs are well-suited for cold chain applications involving subtropical fruits. Additionally, the risk of cold storage material leakage and its consequent detriment to fruit safety could be significantly reduced by using our state-of-the-art gel packaging technique. Gel-based encapsulation effectively minimized leakage risk and prevented potential contamination. Pre-charging BPCCSGs during off-peak hours significantly improved energy and cost efficiency (3.82 × 10⁻⁵ $·J⁻¹), while reducing environmental burden. Moreover, the improvement in thermal conductivity and the optimization of the spatial layout facilitated temperature uniformity of BPCCSGs at cold storage scenarios. Finally, the integration of a 5G-enabled sensor system enabled real-time monitoring of temperatures and locations. The system was successfully deployed in waxberry logistics, ensuring real-time traceability and maintaining fruit quality, highlighting its potential for next-generation cold chain systems.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"178 ","pages":"Pages 192-202"},"PeriodicalIF":3.5,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144604645","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 study on a low-heat-capacity non-uniform power distribution defrost heater for frost-free refrigerators 无霜冰箱用小热容非均匀配电除霜加热器试验研究

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-07-03 DOI: 10.1016/j.ijrefrig.2025.07.002

Hui Chen , Tian Wang , Pengcheng Zheng, Peng Yang, Yingwen Liu

{"title":"Experimental study on a low-heat-capacity non-uniform power distribution defrost heater for frost-free refrigerators","authors":"Hui Chen , Tian Wang , Pengcheng Zheng, Peng Yang, Yingwen Liu","doi":"10.1016/j.ijrefrig.2025.07.002","DOIUrl":"10.1016/j.ijrefrig.2025.07.002","url":null,"abstract":"<div><div>Refrigerators, among the most widely used refrigeration devices, face efficiency declines due to frost buildup on evaporators during repeated cooling cycles. Currently, steel tube defrost heaters (STDH) are employed to tackle this issue. However, the high heat capacity of the STDH results in slow heat transfer, leading to significant energy consumption for defrosting, which accounts for nearly 12.0 % of the total system energy consumption. To address this issue, this paper proposes a low-heat-capacity non-uniform power distribution defrost heater (LHNPDH). The LHNPDH features electric heating wires wound around the outer surface of the heater, enabling rapid transfer of defrosting heat. In addition, the power distribution of the heater can be adjusted across different regions by varying the winding density of the heating wire, thereby achieving on-demand defrosting. The experimental results demonstrate that, compared to STDH, LHNPDH can reduce the total defrosting cycle time by 25.1 %, decrease the temperature rise in the freezer compartment (FC) by 2.7 °C, lower the maximum FC temperature by 4.1 °C, and reduce defrosting energy consumption by 28.6 %. Therefore, the LHNPDH developed in this study can utilize and distribute defrost heat more rationally and efficiently, ultimately achieving an effective energy saving of 2.6 % for the refrigerator.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"178 ","pages":"Pages 122-132"},"PeriodicalIF":3.5,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144562888","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

Application and analysis of two-stage heat recovery and flash vaporization process in high-temperature heat pump systems for steam production 两级热回收与闪蒸工艺在高温热泵制汽系统中的应用与分析

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-07-03 DOI: 10.1016/j.ijrefrig.2025.07.001

Zheng Huang , Yanting Zhang , Lin Wang , Yunlong Zheng , Guanxiang Qiao

引用次数: 0