Case Studies in Thermal Engineering最新文献

英文中文

Experimental Investigation on Heat Transfer Performance and Temperature Uniformity of Two-Phase Cooling in Microchannels with Different Cross-Section Geometries 不同截面几何形状微通道两相冷却换热性能及温度均匀性的实验研究

IF 6.8 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering

Pub Date : 2026-01-28 DOI: 10.1016/j.csite.2026.107740

Jingya Qi, Jun Zhang

引用次数: 0

Performance investigation and multi-objective optimization of hydrophilic polymeric membrane condenser for recovering flue gas moisture and heat 烟气湿热回收用亲水性聚合物膜冷凝器性能研究及多目标优化

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering

Pub Date : 2026-01-28 DOI: 10.1016/j.csite.2026.107756

Si-Min Huang, Zilong Wang, Zhuo Ning, Liehui Xiao

In recent years, the recovery of moisture and heat from flue gas utilizing hydrophilic ceramic membrane condenser (HCMC) has garnered significant attention due to its high recovery performance, achieved by the mechanisms of moisture condensation and condensed water penetration. However, the exorbitant cost of ceramic membranes imposes limitations on the widespread application of HCMC. In recent studies, a novel device called the hydrophilic polymeric membrane condenser (HPMC) has been introduced for effectively capturing moisture and heat. However, the previous experimental investigations possess certain limitations such as restricted module size and a disparity with actual operating conditions. In addition, conflicts exist among the performance characteristics of HPMC, and due to the presence of numerous influencing factors, multi-objective optimization research is necessary. Therefore, the present study establishes a computational model to examine the effectiveness of HPMC, encompassing recovery performance and flow resistance performances. The NSGA-II method is employed to perform multi-objective optimization, integrating the EWM and TOPSIS methods to derive the optimal solution. The findings indicate that the increase in flue gas flow rate has a negligible impact on recovery performance, but it would lead to an elevated pressure drop of the flue gas. The rise of flue gas temperature can enhance the recovery performance, resulting in a maximum recovered water flux of 8.52 kg/(m²·h) and recovered heat flux of 21.63 MJ/(m²·h), respectively. The optimal pressure drop of the flue gas and recovered water per volume for HPMC are determined to be 3219.5 Pa and 976.2 kg/(m³·h), respectively.

近年来，利用亲水性陶瓷膜冷凝器（HCMC）回收烟气中的水分和热量受到了广泛的关注，因为它通过凝结水分和凝结水渗透机制实现了高回收性能。然而，陶瓷膜的高昂成本限制了HCMC的广泛应用。在最近的研究中，一种新型的装置被称为亲水性聚合物膜冷凝器（HPMC），用于有效地捕获水分和热量。然而，以往的实验研究存在一定的局限性，如限制模块尺寸和与实际操作条件的差距。此外，HPMC的性能特性之间存在冲突，影响因素众多，需要进行多目标优化研究。因此，本研究建立了一个计算模型来检验HPMC的有效性，包括恢复性能和流动阻力性能。采用NSGA-II方法进行多目标优化，将EWM和TOPSIS方法相结合，得到最优解。研究结果表明，烟气流量的增加对回收性能的影响可以忽略不计，但会导致烟气压降升高。烟气温度的升高可以提高回收性能，最大回收水通量为8.52 kg/(m2·h)，最大回收热通量为21.63 MJ/（m2·h）。确定了HPMC的最佳烟气压降为3219.5 Pa，回收水为976.2 kg/（m3·h）。

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引用次数: 0

Effects of building thermal performance and HVAC control on indoor comfort and energy use 建筑热工性能和暖通空调控制对室内舒适性和能源利用的影响

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering

Pub Date : 2026-01-28 DOI: 10.1016/j.csite.2026.107763

Joowook Kim , Sohyun Park , Doosam Song

Thermal comfort significantly impacts indoor environmental quality, influencing occupant health, productivity, and building energy efficiency. Conventional HVAC control strategies primarily utilize dry-bulb temperature (DBT) setpoints; however, this approach often neglects radiant temperature variations, resulting in uneven thermal comfort conditions across indoor spaces. This study investigates the influence of building thermal performance on indoor thermal comfort through field measurements conducted in two office buildings characterized by differing insulation properties, window performance, and airtightness levels. Additionally, building energy simulations were performed to comparatively assess the effectiveness of operative temperature (OT) control versus DBT control. The findings reveal that inadequate thermal envelope performance leads to pronounced radiant temperature discrepancies between perimeter and interior zones, exacerbating occupant discomfort and increasing energy demand. While OT-based control strategies enhance thermal comfort by accounting for radiant temperature effects, they simultaneously elevate energy consumption, especially in buildings with inferior insulation and envelope performance. Nevertheless, improvements in envelope performance significantly reduce the energy consumption disparity between OT and DBT control methods, enabling high-performance buildings to achieve optimal thermal comfort and energy efficiency simultaneously. Considering the extensive proportion of aging building stock in South Korea characterized by suboptimal thermal envelopes, this research underscores the critical need for retrofitting strategies, including enhanced insulation, advanced glazing technologies, and improved airtightness. Ultimately, integrating advanced HVAC control approaches with robust building envelope upgrades is essential to sustainably balance indoor thermal comfort and energy efficiency.

热舒适显著影响室内环境质量，影响居住者健康、生产力和建筑能源效率。传统的HVAC控制策略主要利用干球温度（DBT）设定值；然而，这种方法往往忽略了辐射温度的变化，导致室内空间的热舒适条件不均匀。本研究通过对两栋具有不同隔热性能、窗户性能和气密性水平的办公大楼进行实地测量，探讨了建筑热工性能对室内热舒适的影响。此外，还进行了建筑能量模拟，以比较评估工作温度（OT）控制与DBT控制的有效性。研究结果表明，不充分的隔热性能导致周边和内部区域之间明显的辐射温度差异，加剧了居住者的不适，增加了能源需求。虽然基于ot的控制策略通过考虑辐射温度效应来提高热舒适性，但同时也增加了能耗，特别是在保温和围护结构性能较差的建筑中。然而，围护结构性能的改进显著减少了OT和DBT控制方法之间的能耗差异，使高性能建筑能够同时实现最佳的热舒适和能源效率。考虑到韩国大量老化建筑的特点是不理想的热围护结构，本研究强调了对改造策略的迫切需要，包括增强绝缘、先进的玻璃技术和改进的气密性。最终，将先进的暖通空调控制方法与坚固的建筑围护结构升级相结合，对于可持续地平衡室内热舒适和能源效率至关重要。

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引用次数: 0

Heterostructure photonic crystal selective thermal emitter for laser and infrared camouflage with heat dissipation 用于激光和红外伪装的异质结构光子晶体选择性热发射器

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering

Pub Date : 2026-01-27 DOI: 10.1016/j.csite.2026.107758

Long Wang , Wenhao Wang , Liuying Wang , Lijun Yang , Gu Liu , Chaoqun Ge , Tonghao Liu , Bin Wang , Yuanxi Chang , Cuiping Zhang , Haoqiang Ai , Xiaohu Wu

Multispectral camouflage faces growing urgency due to multimodal detection threats. To meet the spectral requirements for different bands, artificially designed selective spectral properties are needed. However, achieving a balance among simplicity of configuration, durability, spectral selectivity, and large-scale potential remains challenging, as well as achieving passive radiative cooling for effective thermal management. Here, we present a Ge (635 nm)/ZnS (1152 nm)/Ge (1260 nm)/ZnS (1141 nm)/Ge (656 nm) heterogeneous photonic crystal (HPC) selective thermal emitter for achieving low thermal emissivity camouflage (

ε_{3 - 5}

= 0.28,

ε_{8 - 14}

= 0.24), low laser reflection at 10.6 μm (0.29), and radiative cooling within non-atmospheric window (0.70 at 5–7.5 μm). This emitter shows a 25 °C radiative cooling reduction than traditional low-emissivity Cu films at 350 °C. The emitter also has good angle and polarization independence, environmental durability, and can be manufactured on a large scale. This technology offers a cost-effective way for multispectral-compatible camouflage design and creates new opportunities for combining camouflage with thermal management.

由于多模态探测威胁，多光谱伪装面临越来越紧迫的问题。为了满足不同波段的光谱要求，需要人为地设计选择性光谱特性。然而，实现简单配置、耐用性、光谱选择性和大规模潜力之间的平衡仍然具有挑战性，同时实现被动辐射冷却以实现有效的热管理。本文提出了一种Ge (635 nm)/ZnS (1152 nm)/Ge (1260 nm)/ZnS (1141 nm)/Ge （656nm）非均相光子晶体（HPC）选择性热发射器，用于实现低热发射率伪装（ε3−5 = 0.28,ε8−14 = 0.24）、10.6 μm（0.29）低激光反射和非大气窗口辐射冷却（5 - 7.5 μm 0.70）。在350°C时，该发射极的辐射冷却比传统的低发射率Cu薄膜降低了25°C。该发射极具有良好的角度和偏振无关性，环境耐久性，可大规模生产。该技术为多光谱兼容伪装设计提供了一种经济有效的方法，并为将伪装与热管理相结合创造了新的机会。

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引用次数: 0

Electrical and Thermal Performance of Double-Pass Bifacial Photovoltaic Thermal System in Tropical Climate 热带气候条件下双通道双面光伏热系统的电学和热学性能

IF 6.8 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering

Pub Date : 2026-01-27 DOI: 10.1016/j.csite.2026.107760

Ahmad Rajani, Dalila Mat Said, Zulkarnain Ahmad Noorden, Nasarudin Ahmad, Muhammad Subhan Arifin, Tinton Dwi Atmaja, Nia Nuraeni Suryaman, Muslizainun Mustapha, Hilmi Abyan Muzhaffar, Ahmad Fudholi, Randy Erfa Saputra

引用次数: 0

Effect of swirl and hot streak on unsteady thermal performances of film-cooled high pressure turbine rotor 旋流和热条纹对气膜冷却高压涡轮转子非定常热性能的影响

IF 6.8 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering

Pub Date : 2026-01-27 DOI: 10.1016/j.csite.2026.107753

Shenghui Zhang, Shuiting Ding, Chuangkai Liu, Xiaojun Yang, Tian Qiu, Chenyu Gan

引用次数: 0

IF 6.8 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering

Pub Date : 2026-01-27 DOI: 10.1016/j.csite.2026.107748

Yueping Qin, Jinchuan Sun, Chenyu Wang, Zhenming Ren, Yulong Li, Hairong Wang, Yi Xu

引用次数: 0

Design optimisation of air-forced heat sink to improve temperature gradient in power semiconductor modules 改进功率半导体模组温度梯度的空气热沉优化设计

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering

Pub Date : 2026-01-25 DOI: 10.1016/j.csite.2026.107746

Andrew Sharp , Shafiul Monir , Valentine Dumeril , Cedric Belloc , Mobayode Akinslou , Yuriy Vagapov

This paper presents a numerical optimisation of an air-forced heat sink design for application in cooling systems for power electronic devices. A three-phase inverter is a typical power electronic circuit which commonly employs three or six power semiconductor modules installed in a row on an air-forced heat sink. When power loss is evenly distributed among the modules, the temperature increases along the heat sink in the direction from the air inlet to the outlet, creating a thermal gradient across the power semiconductors. This thermal gradient is a negative factor, leading to mechanical stress in the semiconductor structure and reducing the device's reliability and lifespan. To improve the temperature gradient, the study proposes a modification to the standard heat sink design by introducing a V-shaped cut in the fin area near the inlet. This modification creates an inconstant distribution of thermal resistance along the length of the heat sink reducing temperature variation. Numerical simulations were conducted to identify the optimal V-shaped cut configuration providing minimal temperature differences between modules. The optimal value of the V-shaped cut was determined to be 0.255pu, while the standard deviation of the temperature difference between the power semiconductor modules was reduced from 2.194 to 0.183 at a heat flux of 100W per module. The results show that the optimised design significantly reduces the thermal gradient, ensuring a more uniform temperature distribution across the semiconductor modules.

本文提出了一种用于电力电子设备冷却系统的风冷散热器设计的数值优化方法。三相逆变器是一种典型的电力电子电路，通常采用3个或6个功率半导体模块，安装在一排空气散热片上。当功率损耗在模块之间均匀分布时，温度沿着散热器从空气入口到出口的方向升高，在功率半导体上产生热梯度。这种热梯度是一个负面因素，会导致半导体结构中的机械应力，降低器件的可靠性和寿命。为了改善温度梯度，研究提出了一种改进标准散热器设计的方法，在靠近进口的翅片区域引入一个v形切口。这种修改造成沿散热器长度的热阻分布不恒定，减少了温度变化。进行了数值模拟，以确定在模块之间温差最小的情况下的最佳v形切割配置。在每个模块的热流密度为100W时，v形切割的最优值为0.255pu，功率半导体模块之间的温差标准差从2.194降低到0.183。结果表明，优化设计显著降低了热梯度，确保了半导体模块之间更均匀的温度分布。

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引用次数: 0

Influence of MWCNT-enhanced diesel fuels on engine thermal efficiency and emission behavior: Experimental and multivariate analysis mwcnt增强柴油燃料对发动机热效率和排放行为的影响：实验和多变量分析

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering

Pub Date : 2026-01-24 DOI: 10.1016/j.csite.2026.107738

Mehmet Ali Kallioğlu , Hakan Karakaya

This study aims to improve diesel engine performance and reduce harmful emissions by adding multiwall carbon nanotubes (MWCNT) to Eurodiesel fuel. The experiments were conducted using four different engine loads (0.3, 1.0, 2.0 and 3.0 BMEP) and five different MWCNT concentrations (0, 25, 50, 75 and 100 ppm). Fuel combustion characteristics, engine efficiency and exhaust emissions were extensively analyzed. The experimental findings were modeled and optimized by response surface method (RSM) and central composite design (CCD) based on three different operating conditions. It was observed that MWCNT doping improves combustion characteristics by increasing combustion homogeneity due to its high surface area and thermal conductivity. Especially at 3.0 BMEP load condition and 75 ppm MWCNT content, 26.47 % increase in brake thermal efficiency and 21.88 % reduction in specific fuel consumption were achieved. Furthermore, CO and HC emissions were reduced by 28.57 % and 27.27 %, respectively. On the other hand, due to the increase in in-cylinder temperature and more efficient combustion, NO_x emissions increased by 9.30 % and CO₂ emissions increased by 12.5 %. According to the RSM analysis, the optimal MWCNT concentration was determined as 74.74 ppm and the ideal engine load as 1.71 BMEP. The generated models exhibited high accuracy; the lowest R² value was 80.60 % and the composite desirability value was 0.64. Overall, MWCNT nanoparticles stand out as an innovative additive that improves the efficiency of diesel engines and reduces emissions by improving fuel atomization and combustion quality.

本研究旨在通过在欧洲柴油燃料中添加多壁碳纳米管（MWCNT）来提高柴油发动机的性能并减少有害排放。实验采用4种不同的发动机负荷（0.3、1.0、2.0和3.0 BMEP）和5种不同的MWCNT浓度（0、25、50、75和100 ppm）进行。对燃料燃烧特性、发动机效率和废气排放进行了广泛的分析。采用响应面法（RSM）和中心复合设计（CCD）对三种不同工况下的实验结果进行建模和优化。观察到MWCNT掺杂由于其高表面积和高导热性，通过增加燃烧均匀性来改善燃烧特性。特别是在3.0 BMEP负载条件下，MWCNT含量为75 ppm时，制动热效率提高26.47%，比油耗降低21.88%。CO和HC排放量分别减少28.57%和27.27%。另一方面，由于缸内温度的提高和燃烧效率的提高，NOx排放量增加了9.30%，CO2排放量增加了12.5%。通过RSM分析，确定了最佳MWCNT浓度为74.74 ppm，理想发动机负荷为1.71 BMEP。生成的模型具有较高的精度；最低R2值为80.60%，综合期望值为0.64。总的来说，MWCNT纳米颗粒作为一种创新的添加剂脱颖而出，通过改善燃料雾化和燃烧质量来提高柴油发动机的效率，减少排放。

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引用次数: 0

Achieving Optimal Thermohydraulic Efficiency: Comparative Study of Semi-Cylindrical and Semi-Conical Coil Geometries for Heat Exchanger Design 实现最佳热工效率：换热器设计的半圆柱形和半圆锥形盘管几何形状的比较研究

IF 6.8 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering

Pub Date : 2026-01-24 DOI: 10.1016/j.csite.2026.107699

Hatem Gasmi, Khalil Hajlaoui, As'ad Alizadeh, Mazen M. Othayq, Abdellatif M. Sadeq, Walid Aich, Joy Djuansjah, Seyed Hossein Hashemi Karouei

引用次数: 0

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