Case Studies in Thermal Engineering最新文献

Incorporation of nano-encapsulated PCM in clay hollow blocks and cement layer for improving energy efficiency in buildings: A numerical approach 在粘土空心砌块和水泥层中加入纳米封装PCM以提高建筑能源效率：数值方法

IF 6.4 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2025-06-25 DOI: 10.1016/j.csite.2025.106526

Raouf Hassan , Ali B.M. Ali , Omar Al-Khatib , Ibrahim Mahariq

{"title":"Incorporation of nano-encapsulated PCM in clay hollow blocks and cement layer for improving energy efficiency in buildings: A numerical approach","authors":"Raouf Hassan , Ali B.M. Ali , Omar Al-Khatib , Ibrahim Mahariq","doi":"10.1016/j.csite.2025.106526","DOIUrl":"10.1016/j.csite.2025.106526","url":null,"abstract":"<div><div>The growing global demand for building energy highlights the need for advanced materials that enhance thermal performance and reduce greenhouse gas emissions. This study explores the integration of NEPCM into clay hollow blocks and an external cement layer to improve the energy efficiency of building envelopes. Unlike prior studies that rely on simplified thermodynamic models, this research employs a detailed numerical approach based on modified PDEs and effective property models that account for the latent heat behavior of the NEPCM core. Results indicate that increasing φ from 0 % to 10 % delays T<sub>si</sub> peaks by up to 0.8 h, maintains it between 23.3 °C and 26.6 °C, and reduces q<sub>si</sub> by approximately 13 %. Furthermore, P<sub>d</sub> exhibits a parabolic response to ΔT<sub>s</sub>, achieving a maximum reduction of 16 % at ΔT<sub>s</sub> = 20 °C with φ = 10 %. These findings underscore the potential of NEPCM-integrated building materials to support sustainable and thermally adaptive building design.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"73 ","pages":"Article 106526"},"PeriodicalIF":6.4,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144470249","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

An in-depth analysis of residential E-cooling demand in The Netherlands 荷兰住宅电子制冷需求的深入分析

IF 6.4 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2025-06-23 DOI: 10.1016/j.csite.2025.106469

Jim de Wind , Joel Alpízar-Castillo , Julian Visser , Laura Ramírez-Elizondo

{"title":"An in-depth analysis of residential E-cooling demand in The Netherlands","authors":"Jim de Wind , Joel Alpízar-Castillo , Julian Visser , Laura Ramírez-Elizondo","doi":"10.1016/j.csite.2025.106469","DOIUrl":"10.1016/j.csite.2025.106469","url":null,"abstract":"<div><div>The magnitude and effect of residential E-cooling demand on the Dutch energy market have not been studied in the literature. However, due to rising temperatures and the increase in the adoption of heat pumps, the effects of residential e-cooling demand are expected to rise sharply in the upcoming decades. First, a thermodynamic model of different Dutch residential buildings described the magnitude and patterns of residential E-cooling. Second, the effects of E-cooling on the distribution network were tested using the IEEE 906-bus European LV network. Third, a country-wide simulation of the effect of residential E-cooling on the energy market was done in Plexos© from 2025 to 2050. The results showed a doubling of the cooling demand between 2025 and 2030 and a maximum annual cooling demand of approximately 0.4 TWh. In addition, it was shown how the demand for residential cooling could decrease local power quality when more than 40 % of households actively cool their houses simultaneously, increasing network costs. Finally, it was also proven how power prices could increase due to higher demand and how revenue for specific generation components could double or decrease by 20% during heat waves when accounting for residential E-cooling demand.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"73 ","pages":"Article 106469"},"PeriodicalIF":6.4,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144366557","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

Characteristics prediction and optimization for fan duct surface heat exchanger using regional heat transfer correlation and NSWOA aided by Sobol’ Sobol辅助下基于区域传热关联和nswaa的风机表面换热器特性预测与优化

IF 6.4 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2025-06-23 DOI: 10.1016/j.csite.2025.106563

Zhe Xu , Zongling Yu , Xin Ning , Changyin Zhao , Zhihua Zhu , Zhibin Feng

{"title":"Characteristics prediction and optimization for fan duct surface heat exchanger using regional heat transfer correlation and NSWOA aided by Sobol’","authors":"Zhe Xu , Zongling Yu , Xin Ning , Changyin Zhao , Zhihua Zhu , Zhibin Feng","doi":"10.1016/j.csite.2025.106563","DOIUrl":"10.1016/j.csite.2025.106563","url":null,"abstract":"<div><div>Fan duct surface heat exchanger is a new type air-oil heat exchanger adopted in aero-engine lubricating oil system in recent years. A characteristics prediction method based on regional heat transfer correlation is proposed for it to realize heat transfer capacity and oil-side pressure drop calculation, which is validated by conducting thermodynamic experiment. Compared to experimental data, the average relative errors of heat transfer capacity and oil-side pressure drop prediction are 9.39 % and 8.39 %, respectively, which indicates that this method is feasible and reliable. A heat transfer unit response model between nine configuration parameters and heat transfer efficiency, weight is constructed by combining Taguchi and Particle Swarm Optimization-trained Adaptive Neuro-Fuzzy Inference System, and based on it, a characteristics optimization method based on Non-dominated Sorting Whale Optimization Algorithm aided by Sobol’ is proposed to simultaneously realize heat transfer enhancement, flow resistance reduction, and lightweight design. Compared to the original configuration, heat transfer capacity of the selected optimal solutions increases by 12.42 % averagely, while oil-side pressure drop and weight separately decrease by 37.64 % and 12.70 % on average, which indicates that this method is effective and helpful and can provide beneficial guidance for heat exchanger design.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"73 ","pages":"Article 106563"},"PeriodicalIF":6.4,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144470110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on the two thermodynamic states of large-scale RF plasma discharge 大规模射频等离子体放电两种热力学状态的研究

IF 6.4 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2025-06-23 DOI: 10.1016/j.csite.2025.106486

Yue Niu, Weimin Bao, Donglin Liu, Xiaoping Li, Yanming Liu

{"title":"Study on the two thermodynamic states of large-scale RF plasma discharge","authors":"Yue Niu, Weimin Bao, Donglin Liu, Xiaoping Li, Yanming Liu","doi":"10.1016/j.csite.2025.106486","DOIUrl":"10.1016/j.csite.2025.106486","url":null,"abstract":"<div><div>This study focuses on argon discharge in the inductively coupled plasma (ICP) generator of the Experimental Research Apparatus for Electromagnetic Science of Hypersonic Vehicle Plasma in Near-Space. Discharge models under local thermal equilibrium (LTE) and thermodynamic nonequilibrium (NLTE) conditions are developed to reveal the discharge behavior of a high-power ICP generator under different thermodynamic states. In the LTE model, electrons and heavy particles are assumed to share the same temperature, i.e., the plasma temperature. Compressible turbulent flow is described using the Navier–Stokes equations, and electron density is calculated using the Saha equation. In contrast, the NLTE model assumes different temperatures for electrons and heavy particles. The electron density is obtained by solving the drift–diffusion equation, while heavy particle transport is modeled using a mixture-averaged diffusion coefficient approach. The results show that from the coil region to the outlet, the peak plasma temperature in the LTE model decreases by 6.4%, whereas in the NLTE model, the gas and electron temperatures decrease by 12.7% and 26.2%, respectively. The peak electron density decreases by 42% in the LTE model and by as much as 80% in the NLTE model. Comparison with spectroscopic diagnostic results indicates that the normalized trends of electron temperature and electron density are more consistent with the LTE model predictions. These findings provide theoretical insight for optimizing the design of ICP generators.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"73 ","pages":"Article 106486"},"PeriodicalIF":6.4,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144469984","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

Applications of the addition of hydrogen peroxide solution on methane premixed combustion 过氧化氢溶液在甲烷预混燃烧中的应用

IF 6.4 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2025-06-23 DOI: 10.1016/j.csite.2025.106403

Annas Fauzy , Guan-Bang Chen , Ta-Hui Lin

{"title":"Applications of the addition of hydrogen peroxide solution on methane premixed combustion","authors":"Annas Fauzy , Guan-Bang Chen , Ta-Hui Lin","doi":"10.1016/j.csite.2025.106403","DOIUrl":"10.1016/j.csite.2025.106403","url":null,"abstract":"<div><div>In view of practical applications, this study experimentally and numerically investigated the combustion enhancement by hydrogen peroxide solutions on the flame speed of premixed methane-air flame. The experiment uses a conical flame with the addition (<span><math><mi>α</mi></math></span>) and purity (<span><math><mi>β</mi></math></span>) of hydrogen peroxide solution as the main parameter, ranging from <span><math><mrow><mn>0</mn><mtext>%</mtext><mo><</mo><mi>α</mi><mo><</mo><mn>20</mn><mtext>%</mtext></mrow></math></span> and <span><math><mrow><mn>60</mn><mtext>%</mtext><mo><</mo><mi>β</mi><mo><</mo><mn>80</mn><mtext>%</mtext></mrow></math></span>, respectively, from lean to rich. The flame speed was measured using the flame area method with the unburned gas temperature of 423 K. The numerical simulations were conducted using the FreeFlame model with detailed kinetic mechanisms. Numerical simulations showed that the flame speed increased quasi-linearly with the increase of <span><math><mi>α</mi></math></span> and <span><math><mi>β</mi></math></span>. Nevertheless, the experiment shows that the flame speed remains unchanged on <span><math><mrow><mi>β</mi><mo>=</mo><mn>60</mn><mtext>%</mtext></mrow></math></span>, while it increases on <span><math><mrow><mi>β</mi><mo>></mo><mn>70</mn><mtext>%</mtext></mrow></math></span> on various <span><math><mi>α</mi></math></span>. The experiment and numerical simulation consistently correlated the equivalence ratio of the maximum flame speed on various <span><math><mi>α</mi></math></span> and <span><math><mi>β</mi></math></span>. The flame speed from the experiment was underestimated compared with the numerical simulation, presumably owing to the early decomposition of hydrogen peroxide. Finally, using a hydrogen peroxide solution with <span><math><mrow><mi>β</mi><mo>></mo><mn>70</mn><mtext>%</mtext></mrow></math></span> is advisable to increase the overall flame speed of premixed methane-air flames.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"73 ","pages":"Article 106403"},"PeriodicalIF":6.4,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144366586","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

Advancing freeze desalination through ultrasound-enhanced modelling: Case studies and insights for commercial applications 通过超声波增强建模推进冷冻脱盐：商业应用的案例研究和见解

IF 6.4 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2025-06-21 DOI: 10.1016/j.csite.2025.106518

Symeon Savvopoulos , Anas AL-Aghbari , Khadije El Kadi , Denys Dutykh , Isam Janajreh

{"title":"Advancing freeze desalination through ultrasound-enhanced modelling: Case studies and insights for commercial applications","authors":"Symeon Savvopoulos , Anas AL-Aghbari , Khadije El Kadi , Denys Dutykh , Isam Janajreh","doi":"10.1016/j.csite.2025.106518","DOIUrl":"10.1016/j.csite.2025.106518","url":null,"abstract":"<div><div>Freeze desalination is a promising alternative to conventional methods, offering energy-efficient and environmentally friendly solutions for freshwater production. This study presents theoretical modeling of a crystallizer to investigate the dynamics of continuous freeze desalination enhanced by ultrasound vibrations. A mathematical framework combining Navier-Stokes perturbation analysis with crystallization kinetics analyzes the interplay between fluid flow, heat transfer, and crystal growth under varying conditions. The model provides rapid, reliable predictions to support commercial scalability. Results show that increasing vibration velocity amplitudes and extending residence time improve both crystal growth and desalination efficiency. For example, at a vibration velocity amplitude of 12 m/s and a residence time of 135 s, desalination efficiency approaches 50 %, highlighting ultrasound's role in enhancing salt exclusion and crystallization rates. Temperature profiles along the crystallizer indicate that longer residence times allow greater cooling and impurity rejection, with freezing temperatures near the mushy zone approaching the eutectic point. The framework supports the design of scalable systems and fast control strategies to mitigate disturbances, maintain stability, and respond to variable freshwater demands. By linking theoretical modeling with experimental insights, this study advances the development of efficient, commercially viable freeze desalination technologies, offering a sustainable approach to addressing global water scarcity.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"73 ","pages":"Article 106518"},"PeriodicalIF":6.4,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144329811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on the explosion characteristics of alcohol vapor cloud-feed powder dust cloud mixture during the deep processing of waste mash 废醪深加工中酒精蒸气云-进料粉尘云混合物爆炸特性的研究

IF 6.4 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2025-06-20 DOI: 10.1016/j.csite.2025.106538

Huiqiang Ma , Yihan Zhang , Yuyuan Zhang , Bo Liu , Daoyong Zhu , Kaili Xu , Yantao Yao , Junpeng Wang , Tengteng Hao , Jishuo Li , Haihan Zhang , Zongjun Cheng

{"title":"Study on the explosion characteristics of alcohol vapor cloud-feed powder dust cloud mixture during the deep processing of waste mash","authors":"Huiqiang Ma , Yihan Zhang , Yuyuan Zhang , Bo Liu , Daoyong Zhu , Kaili Xu , Yantao Yao , Junpeng Wang , Tengteng Hao , Jishuo Li , Haihan Zhang , Zongjun Cheng","doi":"10.1016/j.csite.2025.106538","DOIUrl":"10.1016/j.csite.2025.106538","url":null,"abstract":"<div><div>The explosion limits (LEL&UEL), maximum explosion pressure (<em>P</em><sub>max</sub>), and minimum ignition energy (MIE) of mixtures composed of four combustible feed dusts and inflammable alcohol vapor are investigated in a modified 20-L spherical explosion system and a modified MIE test system. The explosivity of vapor-dust mixtures is tested according to national standards GB/T16425, GB/T16426 and GB/T16428, using four combustible feed dusts mixed with inflammable alcohol vapor. The results show that adding low concentration alcohol vapor can broaden the range of explosion limits for feed dusts. Alcohol vapor affects both the <em>P</em><sub>max</sub> and MIE of feed dust in a unimodal pattern. There is a critical value for the increase of feed dust explosion parameters by alcohol vapor: 10 vol% alcohol vapor. Below this value, alcohol vapor increases the explosivity of feed dusts remarkably. Above this value, it reduces their explosivity. Finally, the influence of low concentration and high concentration alcohol vapor on feed dusts is examined from the ignition process of alcohol vapor-feed dust mixture. According to the experimental data, we also optimized the explosion discharge area of the auxiliary dust collector of the waste mash drying system. The research conclusion provides a technical means for the safety issues of gas-solid mixed dust removal systems.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"73 ","pages":"Article 106538"},"PeriodicalIF":6.4,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144335506","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

The thermal conductivity characteristics and prediction models of limestone sand-yellow soil mixtures 灰岩-砂黄混合土导热特性及预测模型

IF 6.4 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2025-06-20 DOI: 10.1016/j.csite.2025.106545

Xiong Liu , Ruiyong Mao , Zujing Zhang , Hongwei Wu , Xing Liang , Jing Chen

{"title":"The thermal conductivity characteristics and prediction models of limestone sand-yellow soil mixtures","authors":"Xiong Liu , Ruiyong Mao , Zujing Zhang , Hongwei Wu , Xing Liang , Jing Chen","doi":"10.1016/j.csite.2025.106545","DOIUrl":"10.1016/j.csite.2025.106545","url":null,"abstract":"<div><div>To optimize the backfilling of ground source heat pump drilling mud and boost the thermal conductivity of drilling materials, this study proposes using a mixture of limestone sand and loess, typical in karst regions, as backfill for buried pipe heat exchangers. Through indoor experiments, 152 limestone sand-loess mixtures were prepared and their thermal conductivities tested. Analyses explored the impacts of limestone sand content, moisture content, dry density, and particle size distribution. Results show that artificially graded materials generally outperform natural ones in thermal conductivity, with grading's influence decreasing as moisture rises. At 8 % moisture, grading increases thermal conductivity by 18.57 % (0.069–0.124 W/(m·K)); at 20 %, the increase is 7.63 %. High moisture and limestone sand content can yield a thermal conductivity of 1.508 W/(m·K). When using graded materials, geological conditions and aquifers should be considered, and they suit strata with moderate moisture. A backpropagation neural network - based predictive model for thermal conductivity, developed from experimental data, achieved 6.4 % average absolute percentage error, indicating good accuracy.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"73 ","pages":"Article 106545"},"PeriodicalIF":6.4,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144335501","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

Preliminary design and key components validation of modular recuperated micro gas turbine for small unmanned systems 小型无人系统模块化回热式微燃气轮机初步设计及关键部件验证

IF 6.4 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2025-06-20 DOI: 10.1016/j.csite.2025.106547

Zuojun Wei , Wenhua Duan , Haotian Gao , Cunju Wei , Guangming Ren , Xiaohua Gan

{"title":"Preliminary design and key components validation of modular recuperated micro gas turbine for small unmanned systems","authors":"Zuojun Wei , Wenhua Duan , Haotian Gao , Cunju Wei , Guangming Ren , Xiaohua Gan","doi":"10.1016/j.csite.2025.106547","DOIUrl":"10.1016/j.csite.2025.106547","url":null,"abstract":"<div><div>This paper presents an overview of the preliminary design of a modular recuperated micro gas turbine for small unmanned systems, demonstrating the technical feasibility of this integrated power solution. Analysis identifies a pressure ratio near 5.0 as optimal and feasible for the high-power scheme, balancing flow-specific power and thermal efficiency. Electrical power outputs between 15 kW and 150 kW are achievable, with specific fuel consumption (SFC) lower than 0.225 kg/(kW∙h) for outputs exceeding 50 kW. At 150 kW point, thermal efficiency for electricity reaches 37.3 % with an SFC of 0.2294 kg/(kW∙h). The low-power scheme achieves 0.78 isentropic efficiency at a pressure ratio of 2.85, with turbine efficiency higher than 0.825. The high-power scheme's compressor achieves an efficiency of 0.798 with a pressure ratio of 5.08, and the turbine efficiency reaches 0.897. Experimental testing of the single-can combustor shows a total pressure loss of 3.29 % and combustion efficiency of 97.13 % at design point. The cross-corrugated primary surface recuperator achieves an effectiveness of 0.9195 and total pressure loss of 3.69 % at a heat-weight ratio of 7.76 kW/kg.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"73 ","pages":"Article 106547"},"PeriodicalIF":6.4,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144335500","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

Fuzzy LQR-Based Control to Ensure Comfort in HVAC System with Two Different Zones 基于模糊lqr的两区空调系统舒适性控制

IF 6.8 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2025-06-20 DOI: 10.1016/j.csite.2025.106544

Elif Çinar, Tayfun Abut

{"title":"Fuzzy LQR-Based Control to Ensure Comfort in HVAC System with Two Different Zones","authors":"Elif Çinar, Tayfun Abut","doi":"10.1016/j.csite.2025.106544","DOIUrl":"https://doi.org/10.1016/j.csite.2025.106544","url":null,"abstract":"Heating, ventilation, and air conditioning (HVAC) systems are control systems that ensure indoor temperature and air quality meet desired conditions. In this study, a novel control strategy is proposed for an HVAC system operating under two distinct environmental zones with variable flow rates, addressing control challenges arising from external disturbances such as ambient temperature and humidity changes. In the system design, mathematical models were obtained, including the heat losses of two zones to the outdoor environment, as well as the heat transfer dynamics in the cooling unit, fans, and air ducts. For system control, considering ambient temperature, humidity, and variable flow rate, the required airflow was achieved by controlling the dampers placed in the indoor air inlet ducts. The core novelty of this work lies in the development and comparison of advanced control algorithms, including the Linear Quadratic Regulator (LQR), a Particle Swarm Optimization (PSO)-based LQR, and a newly designed PSO-based Fuzzy LQR (FLQR) controller. Comfort conditions were achieved by cooling the temperatures of two different regions from the ambient temperature to approximately 7 <ce:sup loc=\"pre\">o</ce:sup>C. The proposed FLQR controller combines the adaptability of fuzzy logic with the optimization capabilities of PSO to enhance system responsiveness and occupant comfort. Simulation results show that the FLQR method improves comfort performance by 90.4% for Zone-1 and 88.1% for Zone-2 compared to conventional LQR. The effectiveness of the proposed method (FLQR) is demonstrated through a comprehensive performance evaluation using Mean Squared Error (MSE) metrics, confirming its potential for intelligent HVAC applications.","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"65 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144335502","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