International Journal of Refrigeration-revue Internationale Du Froid最新文献_第7页

Evolution of subcritical and transcritical cycles and the quantitative influence of heat exchangers configuration on CO2 automotive heat pumps 亚临界和跨临界循环的演变以及换热器配置对CO2汽车热泵的定量影响

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.2025.03.036

Yichen Zhang , Jianmin Fang , Xiang Yin , Bin Chen , Feng Cao , Xiaolin Wang

{"title":"Evolution of subcritical and transcritical cycles and the quantitative influence of heat exchangers configuration on CO2 automotive heat pumps","authors":"Yichen Zhang , Jianmin Fang , Xiang Yin , Bin Chen , Feng Cao , Xiaolin Wang","doi":"10.1016/j.ijrefrig.2025.03.036","DOIUrl":"10.1016/j.ijrefrig.2025.03.036","url":null,"abstract":"<div><div>Traditional CO<sub>2</sub> heat pumps are designed to operate using transcritical cycles to achieve optimal heating performance. However, in scenarios where the inlet air temperature is low, these systems may inadvertently transition to subcritical cycles. This transition is particularly influenced by the sensitivity of the working medium state before the expansion valve (EXV) to the rejection pressure, and system performance can drop if it operates improperly. To well address this problem, a mathematical model was established to reveal the underlying reason for optimal operation between subcritical and transcritical CO<sub>2</sub> cycles. The heat transfer in the gas cooler was first evaluated and analyzed. The effect of parameters, including air flow rate, inlet and supply air temperature, on heat transfer performance were investigated. Moreover, the evolution boundary between subcritical and transcritical CO<sub>2</sub> cycles were summarized. The quantitative influence of heat exchanger configuration on the evolution characterize was further analyzed, and the impact weights of various parameters under different heat exchanger designs on the anticipated operating pressure were studied. Based on simulation results, the inlet air temperature had the highest influence on the sub-transcritical cycle evolution, accounting for > 81 % across various systems. This study explained why different system designs correspond to different optimal pressure correlation equations for both transcritical and subcritical CO<sub>2</sub> cycles, as these were affected by the unique characteristics of sub- to trans-critical evolution for electric CO<sub>2</sub> heat pumps in winter. It provides new insights into achieving universal optimal operation of CO<sub>2</sub> heat pumps for low-temperature heating applications.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"175 ","pages":"Pages 424-436"},"PeriodicalIF":3.5,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143882143","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

Quantitative evaluation of environmental influence of heat emission from lake water heat pump 湖泊水源热泵放热对环境影响的定量评价

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.2025.03.027

Jinghui Luo , Shicheng Xin , Yunxin Huang , Qiuming Hu , Jinggang Wang , Changjian Zhang

{"title":"Quantitative evaluation of environmental influence of heat emission from lake water heat pump","authors":"Jinghui Luo , Shicheng Xin , Yunxin Huang , Qiuming Hu , Jinggang Wang , Changjian Zhang","doi":"10.1016/j.ijrefrig.2025.03.027","DOIUrl":"10.1016/j.ijrefrig.2025.03.027","url":null,"abstract":"<div><div>In the context of global warming and the energy crisis, Lake Water Heat Pumps (LWHP) show significant advantages in sustainable energy but raise concerns about thermal pollution affecting aquatic ecosystems and system efficiency. This study uses China's <em>Environmental Quality Standards for Surface Water</em> to establish thermal balance through the water surface temperature method. It examines LWHP discharge impacts on lake water temperature and defines a thermal pollution rate based on the lake's thermal load capacity. Using the Nanjing LWHP project as a case study, lake water temperature was measured, and thermal load capacity was analyzed to calculate thermal pollution rates for the coldest and hottest weeks. Results show a vertical temperature gradient in the lake affects refrigerant cooling efficiency and COP variation. The thermal load capacity of the lake is higher in winter than in summer. During the hottest week, the maximum thermal pollution rate for the Nanjing LWHP system is 0.58, and during the coldest week, it is 0.38, neither causing thermal pollution. This study is significant for the rational use of LWHP systems, aquatic ecosystem protection, and sustainable energy technology advancement.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"175 ","pages":"Pages 288-298"},"PeriodicalIF":3.5,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143848015","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 制冷系统中流致噪声的声学特性调优

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 , Wenbin Zhang , Jilai Cao , 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

Analysis of power consumption influencing factors in different modes of semiconductor factory refrigeration station based on association rule mining 基于关联规则挖掘的半导体工厂制冷站不同模式功耗影响因素分析

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-03-23 DOI: 10.1016/j.ijrefrig.2025.03.032

Chuang Yang, Huanxin Chen

{"title":"Analysis of power consumption influencing factors in different modes of semiconductor factory refrigeration station based on association rule mining","authors":"Chuang Yang, Huanxin Chen","doi":"10.1016/j.ijrefrig.2025.03.032","DOIUrl":"10.1016/j.ijrefrig.2025.03.032","url":null,"abstract":"<div><div>At present, the energy consumption of room air conditioning in major rooms is relatively high, and the use of relevant methods to study the relationship between various parameters during the operation of the room refrigeration station is of great significance to the energy saving and regulation of the room air conditioning system. In this paper, a room refrigeration station in Xiamen is selected as the research object to study the real-time operation data of the system from March to June. After processing the outliers and missing values in the original dataset, the clustering algorithm K-means is first used to divide them into three categories, and the operating status and load size of chillers in various modes are preliminarily analyzed. Then, the association rule analysis algorithm Apriori is used to find the association rules between the parameters in each type of data, and the results show that the parameters that are more related to the system power are the outdoor temperature and the inlet and outlet temperature of the cooling water in the circulation. Using this result, the appropriate operating mode can be found by collecting system operating data, which can provide guidance for the energy-saving operation and regulation of the room's air conditioning.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"175 ","pages":"Pages 187-195"},"PeriodicalIF":3.5,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808157","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 寒冷气候下电动汽车CO2热管理系统的能量利用：不同热源模式的评价

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 , Ming Li , Jun Wang , Shuangyuan Xiong , Chunhong Lu , Zhanzhuo Song , Haikang Chen , 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 双效蒸汽吸收式固体氧化物燃料电池三联产系统的能源、经济和环境评价

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 , Pawan Kumar Singh , Aftab Anjum , K.K. Sivakumar , Shikha Gupta , 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 采用并联压缩机和集成过冷却器的CO2跨临界循环实验改进

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, D. Sánchez, 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

Simulation and experimental verification of cooling thermal performance of vertical tube downflow composite evaporative cooling tower 垂直管下流式复合蒸发冷却塔冷却热性能的仿真与实验验证

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-03-19 DOI: 10.1016/j.ijrefrig.2025.03.023

Tu Aimin , Lin Zhongxuan , Zhan Xuefeng , Yin Jiying , Liu Shijie , Zhu Dongsheng

{"title":"Simulation and experimental verification of cooling thermal performance of vertical tube downflow composite evaporative cooling tower","authors":"Tu Aimin , Lin Zhongxuan , Zhan Xuefeng , Yin Jiying , Liu Shijie , Zhu Dongsheng","doi":"10.1016/j.ijrefrig.2025.03.023","DOIUrl":"10.1016/j.ijrefrig.2025.03.023","url":null,"abstract":"<div><div>The thermal performance of a vertical tube downflow composite evaporative cooling tower(VTD-CECT) with three-dimensional tubes was simulated under engineering application conditions. The effects of different ambient air conditions, different hot water inlet temperatures, and different spray densities on the cooling performance of VTD-CECT were analyzed. The performance test of the experimental prototype was carried out and compared with the simulated values, and the results show that the established VTD-CECT thermal performance prediction model has a good prediction effect. Analyzed the impact of packing to enhance the cooling capacity of evaporative cooling tower, the results show that in the case of 50 % of the cooling airflow through the packing, in the range of adjustable test conditions can enhance the cooling capacity of the VTD-CECT 31.7 % ∼ 40.8 %, reduce the spray water temperature of 0.94 ∼ 2.79 °C, and the reduction in metal usage is significant. A methodology for evaluating the cooling capacity of closed cooling towers is proposed. This study can provide a reference for the engineering application of the VTD-CECT.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"175 ","pages":"Pages 85-94"},"PeriodicalIF":3.5,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143767842","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 the thermal performance of a dry-shipper used in deep frozen cold chain 用于深冻冷链的干式托运人的热性能评价

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-03-19 DOI: 10.1016/j.ijrefrig.2025.03.014

R.M.A. Spijkers , A. Damas , Z. Zhang , S. Vanapalli

{"title":"Assessment of the thermal performance of a dry-shipper used in deep frozen cold chain","authors":"R.M.A. Spijkers , A. Damas , Z. Zhang , S. Vanapalli","doi":"10.1016/j.ijrefrig.2025.03.014","DOIUrl":"10.1016/j.ijrefrig.2025.03.014","url":null,"abstract":"<div><div>A dry shipper is a vacuum insulated transport container with a liquid nitrogen filled porous lining inside to transport frozen biomedical samples. The current understanding of the thermal characteristics of vacuum insulated vessels is based on standard cryostats, where the liquid collects in a pool at the bottom accompanied by a stratified vapor above it, wherein the temperature increases with height. However, the behavior of a dry-shipper diverges significantly from these standard cryostats, since the liquid is contained within a porous lining rather than at the vessel’s base, stratification is absent. The current thermal models for standard cryostats cannot be applied to a dry-shipper due to the difference in temperature profile, therefore the thermal characteristics of a dry-shipper are investigated. We present experimental data of an instrumented dry-shipper subjected to various simulated conditions, namely the ambient temperature is varied from 295 K to 333 K and the positioning is varied from upright to an angle of 45°and 90°. We observed that the mass of the dry-shipper reduced linearly with time, which corresponds to a constant evaporation rate of the liquid nitrogen in the container. A simplified model is developed to predict the liquid nitrogen evaporation rate in the dry-shipper as a function of ambient conditions, giving indirect measurement of the liquid nitrogen in the container. This will aid shipping firms to plan the transport as well as develop smart versions of the dry-shipper.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"175 ","pages":"Pages 156-163"},"PeriodicalIF":3.5,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785135","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

Novel concept of magnetocaloric heat pipe and its micro-unit regeneration cycle 磁热管及其微单元再生循环的新概念

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, 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