International Journal of Refrigeration-revue Internationale Du Froid最新文献_第3页

A comprehensive variable refrigerant flow heat recovery model for building performance simulation 一种用于建筑性能模拟的综合变冷媒流热回收模型

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-06-23 DOI: 10.1016/j.ijrefrig.2025.06.023

Aziz Mbaye , Massimo Cimmino

{"title":"A comprehensive variable refrigerant flow heat recovery model for building performance simulation","authors":"Aziz Mbaye , Massimo Cimmino","doi":"10.1016/j.ijrefrig.2025.06.023","DOIUrl":"10.1016/j.ijrefrig.2025.06.023","url":null,"abstract":"<div><div>A comprehensive, physics-based, and modular Variable Refrigerant Flow with Heat Recovery (VRF-HR) model is developed for multi-year simulations of large-scale VRF systems. The model is designed to simulate various operational modes, including single-mode (cooling-only, heating-only) and heat recovery mode, across any number of indoor units (IUs), outdoor units (OUs), and compressors. A parameter-estimation procedure leveraging manufacturer data is implemented to calibrate the model, ensuring accurate system representation. A machine learning-based control strategy is introduced to emulate real-world compressor selection for partial load operation. The model is validated using two years of operational data from a large-scale VRF system serving the first floor of the former ASHRAE Headquarters Building in Atlanta, USA, which consists of 22 indoor units, 2 outdoor units, and 8 compressors. Results demonstrate that the manufacturer-tuned model accurately predicts total energy consumption, achieving a relative error of 9.5 %, an NMBE of 6.2 %, and a CVRMSE of 27.2 % over the first year. For the second year, the model achieves a CVRMSE of 25.3 %, an NMBE of 5 %, and a relative error of 7 %, meeting ASHRAE calibration criteria.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"178 ","pages":"Pages 51-70"},"PeriodicalIF":3.5,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144563265","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

Effect of ultrasonic oscillation combined with atomization on enhancing ammonia-water falling film process and performance of absorption refrigeration system 超声振荡结合雾化对提高吸收式制冷系统氨-水降膜过程及性能的影响

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-06-21 DOI: 10.1016/j.ijrefrig.2025.06.021

Chuang Pan , Jinlei Li , Runfa Zhou , Shuhong Li , Yanjun Li , Jun Wu , Gui Li

{"title":"Effect of ultrasonic oscillation combined with atomization on enhancing ammonia-water falling film process and performance of absorption refrigeration system","authors":"Chuang Pan , Jinlei Li , Runfa Zhou , Shuhong Li , Yanjun Li , Jun Wu , Gui Li","doi":"10.1016/j.ijrefrig.2025.06.021","DOIUrl":"10.1016/j.ijrefrig.2025.06.021","url":null,"abstract":"<div><div>The ammonia-water absorption refrigeration system (AARS) can utilize low-grade heat sources to drive the generation of high-grade energy. The enhancement of the coupled heat and mass transfer is the key to improving the system performance, thereby reducing energy consumption and the size of components. High-frequency ultrasonic waves can generate fine droplets, increasing the mass transfer area of gas-liquid contact. Medium and low-frequency ultrasonic oscillations can enhance the disturbance and heat and mass transfer within the falling film solution, increasing the driving potential for mass transfer, and thus realizing the improvement of the system performance. Therefore, a thermodynamic mathematical model of the system was established, and the reliability of the model was verified through a constructed experimental system. The coefficient of performance (<em>COP</em>) and exergy efficiency (<em>COE</em>) were used to describe the system energy consumption and irreversible losses. The size reduction rate was used to measure the reduction of the system size, and economic evaluation indicators were used to assess the investment and operating costs of the system operation. The results show that the installation of atomizers and oscillators has a positive impact on the system performance, making the system more compact and efficient. The <em>COP</em> can be improved by up to 37.12 %, the irreversible losses can be reduced by up to 43.82 %, the size of the main components can be reduced by up to 39.5 %, and the annual operating cost can be reduced by up to 30.85 %, providing a strong basis for the practical application of ultrasonic waves in AARS.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"177 ","pages":"Pages 417-435"},"PeriodicalIF":3.5,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144491104","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 serpentine-looped minichannel pulsating heat pipe heat exchanger with horizontal installation for full-year efficient heat recovery in air conditioning 卧式蛇形环小通道脉动热管换热器全年高效热回收试验研究

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-06-17 DOI: 10.1016/j.ijrefrig.2025.06.019

Yu Sun, Xinyi Zhang, Yongqi Zeng, Yuhang Zhang, Dong Huang, Rijing Zhao

{"title":"Experimental study on serpentine-looped minichannel pulsating heat pipe heat exchanger with horizontal installation for full-year efficient heat recovery in air conditioning","authors":"Yu Sun, Xinyi Zhang, Yongqi Zeng, Yuhang Zhang, Dong Huang, Rijing Zhao","doi":"10.1016/j.ijrefrig.2025.06.019","DOIUrl":"10.1016/j.ijrefrig.2025.06.019","url":null,"abstract":"<div><div>The heat recovery technology is considered to be one of the effective energy-saving means for buildings. The heat pipe, as a simple passive device with high thermal conductivity, has been widely used in heat recovery applications. Due to the opposite positions of cold and heat sources in winter and summer, vertical or inclined heat pipe heat exchangers can be difficult to operate in a certain seasonal condition. The horizontal heat pipe heat exchanger can solve this problem, but suffers from low heat transfer efficiency. The horizontal air-to-air finned heat exchanger is proposed based on the serpentine-looped minichannel pulsating heat pipe (SLMPHP) for efficient heat recovery in air conditioning. The SLMPHP heat exchanger is experimentally studied including the effects of the filling ratio, air flowrate and indoor and outdoor temperatures. The internal oscillation behaviors are also explored using Power Spectrum Density (PSD) method. Results show that the optimal range of the filling ratio for the SLMPHP is 45–65 % with greater oscillation intensity, and the maximum temperature effectiveness can reach 83.8 % in summer and 84.5 % in winter under horizontal installation, respectively. A thermal resistance map of SLMPHP heat exchanger is also presented for analysis and further prediction of its heat transfer performance to provide a guideline for the SLMPHP application in building heat recovery.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"178 ","pages":"Pages 71-87"},"PeriodicalIF":3.5,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144557679","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

Phase change nanoemulsions developed by a modified phase inversion temperature method for low-temperature thermal energy storage 采用改进的相变温度法制备了用于低温储热的相变纳米乳

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-06-17 DOI: 10.1016/j.ijrefrig.2025.06.020

Songping Mo , Wenke Cheng , Junhao Chen , Yuxuan Lin , Zicai Pan , Zhi Yang , Lisi Jia , Yanping Du , Ying Chen

{"title":"Phase change nanoemulsions developed by a modified phase inversion temperature method for low-temperature thermal energy storage","authors":"Songping Mo , Wenke Cheng , Junhao Chen , Yuxuan Lin , Zicai Pan , Zhi Yang , Lisi Jia , Yanping Du , Ying Chen","doi":"10.1016/j.ijrefrig.2025.06.020","DOIUrl":"10.1016/j.ijrefrig.2025.06.020","url":null,"abstract":"<div><div>Phase change nanoemulsions based on high-concentration ethylene glycol (EG) solutions have been developed for low-temperature thermal energy storage (TES). To address the challenge of poor nanoemulsion stability at high EG concentrations, a modified phase inversion temperature method was proposed. Through optimization of processing parameters and nanoemulsion formulation, nanoemulsions with improved stability were successfully achieved. Comprehensive stability tests confirmed their enhanced long-term storage stability. Thermal cycling tests performed over 300 cycles demonstrated that droplet sizes stabilized around 150 nm, with a polydispersity index <0.02. Notably, the sample containing 40 wt % EG demonstrated minor decreases in melting and freezing enthalpies of 2.7 % and 0.8 %, respectively, indicating its high thermal cycling performance. Furthermore, the energy storage capacities of nanoemulsions with 30, 40, and 50 wt % EG significantly exceeded those of the base fluids by 94.60 %, 93.89 %, and 105.85 %, respectively. These results underscore the significant potential of these nanoemulsions for application in low-temperature TES systems.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"178 ","pages":"Pages 9-22"},"PeriodicalIF":3.5,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144523622","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

Employing cooling/power cycle in a sustainable geothermal scheme integrated desalinated water-based H2 production/liquefaction; AI-aided multi-facet optimization and economic examination 采用冷却/动力循环的可持续地热方案集成了脱盐水基制氢/液化；人工智能辅助的多方面优化和经济性检验

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-06-17 DOI: 10.1016/j.ijrefrig.2025.06.016

Tianwen Yin , LeI Chang , Sinan Q. Salih , Ahmad Almadhor , Mohamed Shaban , Essam R. El-Zahar , Ashit Kumar Dutta , Barno Abdullaeva , H. Elhosiny Ali , Hind Albalawi

{"title":"Employing cooling/power cycle in a sustainable geothermal scheme integrated desalinated water-based H2 production/liquefaction; AI-aided multi-facet optimization and economic examination","authors":"Tianwen Yin , LeI Chang , Sinan Q. Salih , Ahmad Almadhor , Mohamed Shaban , Essam R. El-Zahar , Ashit Kumar Dutta , Barno Abdullaeva , H. Elhosiny Ali , Hind Albalawi","doi":"10.1016/j.ijrefrig.2025.06.016","DOIUrl":"10.1016/j.ijrefrig.2025.06.016","url":null,"abstract":"<div><div>The sustainable nature of geothermal energy, combined with advances in power generation technologies, has allowed establishing sustainable energy supply programs. To respond to significant thermal losses, it is crucial to develop hybrid systems that minimize irreversibility through environmentally friendly methods, which is vital for the longevity of these energy conversion processes. Thus, this study introduces an innovative environmentally friendly thermal plan that identifies and addresses points of thermal losses in a geothermal power cycle. The process employs a multi-step approach for producing desalinated water, converting it into hydrogen, and subsequently liquefying hydrogen gas. The suggested scheme incorporates subsystems, encompassing a geothermal flash cycle, an organic flash cycle, a unit for thermally produced desalinated water, a combined cooling and power cycle, a water electrolysis module, and a Claude cycle. This research assesses the thermodynamic, cost, and sustainability viewpoints. The research’s primary aim is to optimize the system’s performance using an artificial intelligence-driven optimization algorithm. The optimization targets the cost of liquefied hydrogen and exergy efficiency as objective functions, employing artificial neural networks that achieve a regression coefficient of 1 to initiate the optimization process. Using the NSGA-II algorithm, four decision variables are utilized to map the Pareto front, revealing an optimum exergetic efficiency of 0.3208 and a liquefied hydrogen cost of 0.3676 $/lit. The hydrogen liquefaction rate is attained at 44.57 lit/h, resulting in a sustainability index of 1.472.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"177 ","pages":"Pages 436-455"},"PeriodicalIF":3.5,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144490980","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 energy and exergy assessments of a mechanical vapor compression refrigeration system having low-GWP alternative gas of pure R1234yf and its nanoparticle mixtures using artificial intelligence models 基于人工智能模型的低gwp纯R1234yf及其纳米颗粒混合物替代气体的机械蒸汽压缩制冷系统的实验能量和火用评估

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-06-17 DOI: 10.1016/j.ijrefrig.2025.06.017

Kayhan Dağıdır , Kemal Bilen , Andaç Batur Çolak , Ahmet Selim Dalkılıç

{"title":"Experimental energy and exergy assessments of a mechanical vapor compression refrigeration system having low-GWP alternative gas of pure R1234yf and its nanoparticle mixtures using artificial intelligence models","authors":"Kayhan Dağıdır , Kemal Bilen , Andaç Batur Çolak , Ahmet Selim Dalkılıç","doi":"10.1016/j.ijrefrig.2025.06.017","DOIUrl":"10.1016/j.ijrefrig.2025.06.017","url":null,"abstract":"<div><div>Concerns about the effects of current refrigerants on global warming and ozone depletion have accelerated the development of alternatives. In the current work, two different Artificial Neural Network (ANN) structures were established to estimate the parameters Coefficient of Performance (COP<sub>R</sub>), exergy efficiency (η<sub>ex</sub>), isentropic efficiency (η<sub>isen</sub>) and total exergy destruction (Ex<sub>dest_Total</sub>) as outputs based on the experimental data of the alternative refrigerant R1234yf containing aluminum oxide (Al<sub>2</sub>O<sub>3</sub>), graphene, and Carbon Nanotubes (CNTs) nanoparticles instead of the conventional refrigerant R134a in a mechanical Vapor Compression Refrigeration System (VCRS). In experimental cases, the use of pure R1234yf, R1234yf+Al<sub>2</sub>O<sub>3</sub>, R1234yf+graphene, and R1234yf+ CNTs instead of R134a was experimentally investigated with energy and exergy approaches at same system. In network topologies, 70 % of all data points were utilized for training, 15 % for validation, and 15 % for testing. Finally, the Levenberg-Marquardt learning algorithms with measured and calculated values as input parameters were assessed as the training ones in Multilayer Perceptron (MLP) models. The coefficients of determination were greater than 0.99. The average deviations were smaller than 0.01 %. The high-accuracy predictions enable rapid performance optimization of R1234yf-based nanorefrigerants, providing manufacturers with a validated tool to comply with impending refrigerant regulations while minimizing experimental costs and system redesign efforts. This AI framework bridges the gap between nanoparticle-enhanced thermodynamics and industrial deploy ability.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"178 ","pages":"Pages 105-121"},"PeriodicalIF":3.5,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144562887","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

LSTM-Based Modeling and Cross-Correlation Sensitivity Analysis for Heat Pump Refrigerant Distribution 基于lstm的热泵制冷剂分布建模及相关灵敏度分析

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-06-16 DOI: 10.1016/j.ijrefrig.2025.06.006

Kosuke Miyawaki , Hongtao Qiao , Anna Sciazko , Naoki Shikazono

{"title":"LSTM-Based Modeling and Cross-Correlation Sensitivity Analysis for Heat Pump Refrigerant Distribution","authors":"Kosuke Miyawaki , Hongtao Qiao , Anna Sciazko , Naoki Shikazono","doi":"10.1016/j.ijrefrig.2025.06.006","DOIUrl":"10.1016/j.ijrefrig.2025.06.006","url":null,"abstract":"<div><div>This heat pump study introduces a Resonance-Based Sensitivity Analysis (RBSA) framework, which was inspired by the resonant characteristics of LSTM networks to visualize and interpret correlations between output features. First, we developed an LSTM network that predicts the time-series distribution of refrigerant within the system, focusing on refrigerant migration and its nonlinear dependency on the initial distribution in startup operation. A total of nine different datasets were employed, structured as a 3×3 matrix combining three levels of charged refrigerant, incrementing approximately 10wt% of system refrigerant, and three levels of initial refrigerant in evaporator from 30wt% to 70wt%. The prediction by the network achieved a coefficient of determination exceeding 95% in refrigerant distribution against validation data. Subsequently, targeted noise was applied to specific outputs of the trained network to analyze the intensity of inter-feature dependencies, demonstrating the utility of the RBSA approach in capturing causal relationships within the system. We investigated using both spike noise and persistent Gaussian noise in a comparative analysis to evaluate their distinct effects. During sensitivity evaluation with spike noise, we examined noise propagation between features using cross-correlation functions. The analysis revealed that the relationships between parameters maintained physical plausibility, even without an explicit physical model. We then introduced continuous white noise into the refrigerant distribution to examine its propagation effects and map how distribution fluctuations affected system operating parameters. The findings revealed that variations in refrigerant distribution substantially affect operating parameters such as mass flow rate, compressor input and condenser and evaporator capacity.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"177 ","pages":"Pages 351-363"},"PeriodicalIF":3.5,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144470886","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

Calorimetric determination of emissivity for metallic foils: An innovative approach for thermal analysis 金属箔发射率的量热测定：热分析的创新方法

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-06-15 DOI: 10.1016/j.ijrefrig.2025.06.018

Abdul Rehman Hashmi , Yunfei Gao , Jiahao Yu , Haoren Wang , Bo Wang , Fatima Saadat , Zhihua Gan

{"title":"Calorimetric determination of emissivity for metallic foils: An innovative approach for thermal analysis","authors":"Abdul Rehman Hashmi , Yunfei Gao , Jiahao Yu , Haoren Wang , Bo Wang , Fatima Saadat , Zhihua Gan","doi":"10.1016/j.ijrefrig.2025.06.018","DOIUrl":"10.1016/j.ijrefrig.2025.06.018","url":null,"abstract":"<div><div>In vacuum environments, thermal radiation significantly influences heat transfer, making accurate emissivity predictions crucial for improving the efficiency of refrigeration systems. However, emissivity is a highly sensitive parameter that is challenging to measure with precision due to the limited availability of reliable measurement methods. This paper introduces an innovative method for measuring the total hemispherical emissivity of metallic foils, specifically targeting highly reflective metals. In this study, the emissivity of the 99.9 % pure aluminum with a thickness of 25.4 μm was measured across a temperature range of 170.1 K to 283.8 K, varying from 0.0185 to 0.0205, with a comparative analysis revealing a 38.3 % difference between the shiny and matte sides of the foil. Additionally, the influence of absorber temperature was examined using an insulation layer. The experimental results were validated against published data within the same temperature range and further corroborated through simulations. This approach offers a reliable and precise method for measuring emissivity in highly reflective metals under low-temperature conditions.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"177 ","pages":"Pages 364-377"},"PeriodicalIF":3.5,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144470887","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

Research and process optimization on frostless heat source tower heat pump system based on compound enthalpy enhancement 基于复合焓增强的无霜热源塔热泵系统研究与工艺优化

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-06-14 DOI: 10.1016/j.ijrefrig.2025.06.013

Lei Li , Huafu Zhang , Zhentao Zhang , Fuqiang Qi , Qiu Tu , Hongwei Wu , Junling Yang , Xuelai Zhang , Mingxin He

{"title":"Research and process optimization on frostless heat source tower heat pump system based on compound enthalpy enhancement","authors":"Lei Li , Huafu Zhang , Zhentao Zhang , Fuqiang Qi , Qiu Tu , Hongwei Wu , Junling Yang , Xuelai Zhang , Mingxin He","doi":"10.1016/j.ijrefrig.2025.06.013","DOIUrl":"10.1016/j.ijrefrig.2025.06.013","url":null,"abstract":"<div><div>Due to the problems of high pollution, strong corrosion and high regenerative energy consumption in traditional heat source tower, a compound enthalpy enhancement heat source tower heat pump system using potassium formate solution as antifreeze and integrated mechanical vapor compression solution regeneration system is propose. Using Aspen Plus simulations, this work systematically investigates the impacts of six key parameters: air inlet temperature, relative humidity, airflow velocity, solution-air temperature differential, antifreeze concentration, and spray density on heating performance and energy efficiency. The results demonstrate 15-20% efficiency improvements under elevated ambient temperatures (>15°C) and high humidity conditions (>70% RH). Optimal operational ranges are established as 1.9-2.3 m/s airflow velocity and 14-18 m³/(m²·h) spray density with >5°C thermal differential. The main contributions include developing an environmentally sustainable antifreeze solution implementation framework and establishing practical engineering guidelines for parameter optimization in cold climate applications. These findings provide critical insights for enhancing heat pump system efficiency while reducing corrosion risks and regeneration energy consumption by approximately 25-30% compared to conventional systems.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"177 ","pages":"Pages 320-337"},"PeriodicalIF":3.5,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144330556","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

Nonlinear dynamics and vibration mechanisms in air scroll compressors: A study on orbiting and fixed scroll pair 空气涡旋压缩机的非线性动力学与振动机理：轨道涡旋副与固定涡旋副的研究

IF 3.5 2区工程技术

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-06-10 DOI: 10.1016/j.ijrefrig.2025.06.009

Xiao-Liang Yang , Bin Peng , Ming-Lang Che , Jian-Fei Shi , Zhi-Xiang Liao , Yu-Bo Zhang

{"title":"Nonlinear dynamics and vibration mechanisms in air scroll compressors: A study on orbiting and fixed scroll pair","authors":"Xiao-Liang Yang , Bin Peng , Ming-Lang Che , Jian-Fei Shi , Zhi-Xiang Liao , Yu-Bo Zhang","doi":"10.1016/j.ijrefrig.2025.06.009","DOIUrl":"10.1016/j.ijrefrig.2025.06.009","url":null,"abstract":"<div><div>Scroll compressors exhibit significant potential for application. However, severe vibration issues substantially compromise their reliability. This study aims to unveil the nonlinear meshing vibration mechanisms of the orbiting and fixed scroll pair (OFSP) in air scroll compressor. A nonlinear dynamic model of the meshing vibration of OFSP incorporating radial clearance, time-varying meshing stiffness, friction, contact forces, and meshing errors is established. The meshing state and disengagement mechanism of OFSP are investigated based on phase trajectories and the time history of dynamic meshing force. The combined analysis using bifurcation diagrams and largest Lyapunov exponent (LLE) reveals the influence of the load factor and error fluctuation amplitude on the nonlinear dynamic behavior and stability of OFSP. Two distinct states are identified: complete engagement and engagement-disengagement. Key findings reveal that the dynamic meshing force demonstrates periodic variations across two distinct time scales, amplifying system complexity. The sudden change of the dynamic meshing force in the direction results in the two scrolls to disengage, deteriorating the dynamic performance. Crucially, lowering the load factor or increasing the meshing error amplitude induces a transition in OFSP from stable periodic motion to chaos through bifurcations, leading to greater disengagement severity. These insights provide critical guidance for optimizing air scroll compressor design to suppress vibration-induced failures.</div></div>","PeriodicalId":14274,"journal":{"name":"International Journal of Refrigeration-revue Internationale Du Froid","volume":"177 ","pages":"Pages 456-465"},"PeriodicalIF":3.5,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144502238","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