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Performance investigation of a helium compression system driven by a revamped rolling piston type rotor compressor 改进的滚动活塞式转子压缩机驱动的氦气压缩系统性能研究
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2026-02-01 Epub Date: 2025-11-20 DOI: 10.1016/j.ijrefrig.2025.11.020
Jiayuan Cao , Xiaofeng Xu , Liang Zhang , Yujuan Xia , Hanyi Liu , Yang Yang
Low-temperature refrigeration is indispensable for cryogenic applications like superconductivity and helium liquefaction, and its efficiency hinges on helium compression. This study is critical as it addresses the long-standing gap of rolling piston type rotary compressors (RPTRCs) in helium compression, a key advance for diversifying cryogenic compression technologies. Currently, helium compression relies mostly on scroll or screw compressors, limiting equipment miniaturization and cost-effectiveness; RPTRCs’ poor heat dissipation and high discharge temperatures have excluded them, hindering field progress. To address these challenges, we modified an RPTRC with oil-injection cooling, optimized exhaust, and an external heat exchanger, then built an experimental setup. The tests encompassed rotational speeds ranging from 50 to 100 rps, oil injection volumes between 3.5 to 4.5 L, and inlet water temperatures of 18–24 °C at flow rates of 1–3 L·min-1. The results demonstrated that the modified RPTRC maintained a discharge temperature below 100 °C; specifically at a speed of 100 rps, the exhaust pressure stabilized around 27.2 bar while achieving a volumetric efficiency increase of approximately 10.5 %. Notably, using an oil volume of 4.5 L reduced the exhaust temperature by 12.3 %, although it resulted in an increase in input power by 8.8 %. Furthermore, adjusting inlet water parameters enhanced volumetric efficiency by up to 5 % due to reductions in oil viscosity. This work first validates RPTRCs for helium two-phase compression, provides critical empirical data, and expands cryogenic compressor options, significantly advancing low-temperature refrigeration research and application.
低温制冷对于超导和氦液化等低温应用是必不可少的,其效率取决于氦压缩。这项研究解决了滚动活塞式旋转压缩机(RPTRCs)在氦气压缩方面长期存在的空白,是低温压缩技术多样化的关键进展。目前,氦气压缩主要依赖于涡旋或螺杆压缩机,限制了设备的小型化和成本效益;RPTRCs的散热性差和放电温度高,阻碍了它们的发展。为了应对这些挑战,我们对RPTRC进行了改进,加入了喷油冷却、优化排气和外部热交换器,然后建立了一个实验装置。试验条件为转速为50 ~ 100 rpm,注油量为3.5 ~ 4.5 L,进水温度为18 ~ 24℃,流速为1 ~ 3 L·min-1。结果表明:改性后的RPTRC放电温度保持在100℃以下;特别是在100转/秒的速度下,排气压力稳定在27.2巴左右,同时实现了约10.5%的容积效率提高。值得注意的是,使用4.5 L的油量使排气温度降低了12.3%,尽管它导致输入功率增加了8.8%。此外,由于降低了油的粘度,调整进水参数可使容积效率提高5%。这项工作首次验证了RPTRCs用于氦两相压缩,提供了关键的经验数据,扩展了低温压缩机的选择,显著推进了低温制冷的研究和应用。
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引用次数: 0
Theoretical analysis of the enhancement effect of the combination of ultrasonic oscillation and atomization on the falling film absorption process of ammonia water and optimization of the combined parameters 超声振荡与雾化组合对氨水降膜吸收过程增强作用的理论分析及组合参数的优化
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2026-02-01 Epub Date: 2025-11-26 DOI: 10.1016/j.ijrefrig.2025.11.027
Chuang Pan , Jinlei Li , Runfa Zhou , Shuhong Li , Yanjun Li , Jun Wu , Gui Li
As the core component of the ammonia-water absorption refrigeration system (AARS), the falling film absorber plays a crucial role in enhancing the absorption process, which significantly impacts the improvement of the system's performance. In this paper, a novel absorber that combines ultrasonic oscillation and atomization to enhance the falling film absorption process of ammonia water is proposed. This innovative approach can simultaneously increase the mass transfer area and the driving force for mass transfer. Moreover, a theoretical model of this new absorber is established to analyze its absorption enhancement effect. The results demonstrate that the combined enhancement effect of oscillation and atomization on absorption is superior to that of atomization or oscillation alone. When the total power of the atomizer and oscillator for a single falling film tube is 2 W, the droplet diameter is 17 μm, and the atomization rate is 0.54, the maximum absorption effect is increased by 44.95 %. This study provides a new perspective for the structural optimization of absorbers and the effective improvement of the performance of AARS systems.
降膜吸收器作为氨-水吸收式制冷系统(AARS)的核心部件,对强化氨-水吸收式制冷系统的吸收过程起着至关重要的作用,对系统性能的提高具有重要影响。本文提出了一种超声振荡与雾化相结合的新型吸收体,以增强氨水的降膜吸收过程。这种创新的方法可以同时增加传质面积和传质驱动力。建立了新型吸波器的理论模型,分析了其吸波增强效果。结果表明,振荡和雾化联合作用对吸收的增强效果优于单独的雾化或振荡。当雾化器和振荡器的总功率为2 W,液滴直径为17 μm,雾化率为0.54时,最大吸收效果提高了44.95%。该研究为吸波器的结构优化和AARS系统性能的有效提高提供了新的视角。
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引用次数: 0
Performance study of a novel two-bed thermochemical cooling system for low temperature application: Modelling and Validation 新型低温双床热化学冷却系统的性能研究:建模与验证
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2026-02-01 Epub Date: 2025-11-22 DOI: 10.1016/j.ijrefrig.2025.11.022
Sannapareddy Anilkumar, E.Anil Kumar
Conventional vapor compression systems require significant electrical energy to achieve low evaporator temperatures, which limits their application in low-resource or off-grid scenarios. Sorption-based cooling systems offer a promising alternative by utilizing low-grade thermal energy, reducing dependency on electricity. This study investigates a two-bed thermochemical sorption system to overcome the inherent trade-off in single-bed systems, where achieving low evaporator temperatures typically demands high regeneration temperatures. Four high temperature salt (HTS) and medium temperature salt (MTS) pairs, MnCl2-SrCl2, MnCl2CaCl2, MgCl2-SrCl2, and MgCl2CaCl2 were selected using thermodynamic and kinetic data. Performance of these pairs with optimised two tube-bundle reactor configuration is evaluated using a transient numerical model. The two-bed system achieved evaporator temperatures down to -30 °C with regeneration temperatures as low as 130 °C. MnCl2-SrCl2 showed the highest overall performance of specific cooling power of 57 W/kg, cooling capacity of 854 W and coefficient of performance of 0.14, while MgCl2 pairs performance is low due to its slow kinetics. Overall, analysis revealed that limiting system operation to 70 % of the maximum sorption capacity improves energy efficiency by maintaining faster reaction rates.
传统的蒸汽压缩系统需要大量的电能才能达到较低的蒸发器温度,这限制了它们在低资源或离网情况下的应用。基于吸附的冷却系统通过利用低等级热能,减少对电力的依赖,提供了一个有前途的替代方案。本研究研究了一种双床热化学吸附系统,以克服单床系统固有的权衡,在单床系统中,实现低蒸发器温度通常需要高再生温度。根据热力学和动力学数据选择了MnCl2-SrCl2、MnCl2CaCl2、MgCl2-SrCl2和MgCl2CaCl2 4对高温盐和中温盐。采用瞬态数值模型对优化后的双管束反应器结构进行了性能评价。双床系统实现蒸发器温度低至-30°C,再生温度低至130°C。MnCl2-SrCl2表现出最高的综合性能,比冷功率为57 W/kg,制冷量为854 W,性能系数为0.14,而MgCl2由于其动力学慢,性能较低。总的来说,分析表明,通过保持更快的反应速率,将系统运行限制在最大吸附容量的70%可以提高能源效率。
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引用次数: 0
Coupled design and optimization of the turboexpander-compressor for full-range high efficiency in reverse brayton cycles 反布雷顿循环全范围高效涡轮膨胀-压缩机耦合设计与优化
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2026-02-01 Epub Date: 2025-12-05 DOI: 10.1016/j.ijrefrig.2025.12.004
Yu Tian, Guoyuan Ma
As an environmentally benign natural refrigerant, air has emerged as a promising alternative for sustainable refrigeration systems, where the expander-compressor performance represents the critical limiting factor. This paper proposes a coupled design method for compressors and expanders in air refrigeration cycles, featuring identical pressure ratios, flow similarity, and high-efficiency operation across all working conditions. The imperialist competitive algorithm was implemented with annual system efficiency as the objective function to optimize the turboexpander-compressor. Experimental validation confirms the accuracy of the one-dimensional loss model and computational fluid dynamics simulation, demonstrating the feasibility of the proposed methodology. Under summer conditions of Beijing (2023), the designed system achieves an average turboexpander-compressor system efficiency of 2.759. Results indicate that the ratio of pressure ratio between the compressor and expander remains within 0.9–1.05, satisfying the identical pressure ratio design requirement. The system maintains high efficiency even under peak cooling demand, effectively mitigating performance degradation in high-load scenarios.
作为一种对环境无害的天然制冷剂,空气已成为可持续制冷系统的一种有前途的替代方案,其中膨胀机-压缩机的性能是关键的限制因素。本文提出了一种空气制冷循环中压缩机和膨胀机的耦合设计方法,该方法在所有工况下都具有相同的压比、流量相似和高效运行。采用帝国主义竞争算法,以系统年效率为目标函数,对汽轮膨胀-压缩机进行优化。实验验证了一维损失模型和计算流体动力学模拟的准确性,证明了所提方法的可行性。在北京(2023年)夏季条件下,设计的系统平均效率为2.759。结果表明,压气机与膨胀机的压比保持在0.9 ~ 1.05之间,满足相同压比的设计要求。即使在峰值制冷需求下,系统也能保持高效率,有效缓解高负荷场景下的性能下降。
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引用次数: 0
Simulation study of a CO2 scroll compressor with main and pre-discharge valves 带主排气阀和预排气阀的CO2涡旋压缩机仿真研究
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2026-02-01 Epub Date: 2025-11-19 DOI: 10.1016/j.ijrefrig.2025.11.016
Yixin Liu, Xiangji Yue, Zhijun Zhang, Jiawei Guo
The over-compression phenomenon in CO₂ scroll compressors, compared to those using conventional refrigerants, significantly impairs performance. To address this issue, a three-dimensional simulation model of a CO₂ scroll compressor incorporating pre-discharge valves was developed to mitigate the impact of the over-compression phenomenon on compressor performance. Simulation results indicate that, compared to scroll compressors without a pre-discharge valve (NPDV) structure, those with a pre-discharge valve (PDV) structure exhibits a reduction of 4.4 MPa in the maximum pressure and 25 K in the maximum temperature within the compression chamber. The range of the over-compression effect has been reduced from 251 - 425°to 373 - 425°, and the pre-compression phenomenon is improved. Additionally, the pre-discharge valve structure reduces the impact of the gas on the main discharge valve. It also decreases both the axial and radial clearance gas leakage velocities, with the average mass flow rate of axial clearance leakage reduced by 12 %. As a result of the pre-discharge valve structure, the inlet mass flow rate increases by 4.2 % and the volumetric efficiency improves by 3.2 %. Moreover, the discharge temperature, torque, and shaft power of the scroll compressor are reduced by 5 K, 1.39 N·m, and 99 W, respectively.
与使用常规制冷剂的CO₂涡旋压缩机相比,CO₂涡旋压缩机的过压缩现象严重影响了性能。为了解决这一问题,开发了包含预排气阀的co2涡旋压缩机的三维仿真模型,以减轻过压缩现象对压缩机性能的影响。仿真结果表明,与不带预排气阀结构的涡旋式压缩机相比,带预排气阀结构的涡旋式压缩机最大压力降低4.4 MPa,压缩室最高温度降低25 K。超压缩效应范围由251 ~ 425°减小到373 ~ 425°,预压缩现象得到改善。另外,预排气阀结构减少了气体对主排气阀的冲击。同时降低了轴向间隙和径向间隙气体泄漏速度,轴向间隙泄漏的平均质量流量降低了12%。采用预排气阀结构后,进口质量流量提高4.2%,容积效率提高3.2%。涡旋压缩机排气温度降低5 K,转矩降低1.39 N·m,轴功率降低99 W。
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引用次数: 0
Numerical and experimental assessment of the CO2 ejector for a small-scale refrigeration system for mobile/automotive applications 小型移动/汽车制冷系统CO2喷射器的数值和实验评估
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2026-02-01 Epub Date: 2025-11-17 DOI: 10.1016/j.ijrefrig.2025.10.028
Jakub Bodys , Michal Palacz , Michal Haida , Francesco Fabris , Antonio Rossetti , Jacek Smolka
The design of small-scale CO2 ejectors with throat diameters below 1 mm for mobile CO2 refrigeration units is demanding particularly when prototypes are required in limited quantities for pilot deployment. In this study, a numerical analysis was performed to evaluate design constraints, focusing on six key dimensions of the motive nozzle and mixing section. Simulations were conducted at motive conditions of 86 bar and 35 C and two suction nozzle conditions representative of low-temperature (LT) and medium-temperature (MT) evaporator outlets. The optimized geometry achieved efficiencies of approximately 20 % at pressure lifts of 4-5 bar, fulfilling the cooling power requirements under rated conditions (ambient 30 C). Experimental tests on a dedicated lab-scale test rig validated the design and provided insight into manufacturing tolerances and general performance characteristics. Ejectors demonstrated mass entrainment ratios between 0.45 and 0.50 at the design point (86 bar, 35 C motive; -21 C LT and -10 C MT evaporation). Flow stability varied between configurations: the MT ejector exhibited higher stability, whereas the LT ejector–despite more fluctuation–achieved higher efficiency ( ∼ 26 %). Manufacturing quality was assessed using numerical sensitivity analysis, revealing that deviations in tolerance and surface roughness could lead to reductions of up to 9 % in motive and suction nozzle mass flow rates. These novel findings underscore the critical importance of precision machining for scaled-down CO2 ejector components and demonstrate the feasibility of integrating such systems into compact mobile refrigeration applications.
用于移动式CO2制冷装置的小型CO2喷射器的喉道直径小于1 mm,其设计要求很高,特别是在需要少量样品用于试验部署的情况下。在这项研究中,进行了数值分析,以评估设计约束,重点是六个关键尺寸的喷嘴和混合段。模拟在86 bar和35°C的动力条件下进行,并在低温(LT)和中温(MT)蒸发器出口的两种吸嘴条件下进行。在4-5 bar的压力提升下,优化的几何形状使效率提高了约20%,满足了额定条件下(环境30°C)的冷却功率要求。在专门的实验室规模测试台上进行的实验测试验证了设计,并提供了对制造公差和一般性能特征的深入了解。弹射器在设计点的质量夹带比在0.45到0.50之间(86 bar, 35°C动机;-21°C LT和-10°C MT蒸发)。流动稳定性因配置而不同:MT喷射器表现出更高的稳定性,而LT喷射器尽管波动更大,但效率更高( ~ 26%)。使用数值灵敏度分析评估了制造质量,结果表明公差和表面粗糙度的偏差可能导致动力和吸入喷嘴质量流量减少高达9%。这些新发现强调了精密加工的重要性,缩小了二氧化碳喷射器部件,并证明了将此类系统集成到紧凑的移动制冷应用中的可行性。
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引用次数: 0
A novel dual pressure-temperature interpolation model for mathematically exact adsorption equilibrium for performance simulation of integrated absorption-adsorption refrigeration system using the MIL-101(Cr)/water pair 基于MIL-101(Cr)/水对的综合吸附-吸附制冷系统性能模拟,建立了数学精确吸附平衡的双压力-温度插值模型
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2026-02-01 Epub Date: 2025-12-01 DOI: 10.1016/j.ijrefrig.2025.11.032
N.U. Qadir , H. Bahaidarah
None of the adsorption equilibrium models for both conventional and non-conventional adsorbent materials reported so far in literature represent a close-to-exact correlation with the equilibrium isotherm measured via experimentation. This not only affects the accuracy of performance simulation of adsorption refrigeration system negatively but also the subsequent assessment of feasibility of the system in commercial applications. A dual pressure-temperature interpolation model resulting in a close-to-exact degree of correlation with experimentally acquired equilibrium isotherm greater than all the previously reported models has been proposed which is applicable to both conventional and non-conventional adsorbent materials. Based on the proposed experimentally validated model, the numerical performance prediction of an integrated absorption-adsorption refrigeration system with a hydrostable Metal Organic Framework, MIL-101(Cr), as adsorbent and water as refrigerant has been presented. In addition, a completely novel model to accurately predict the transient dynamics of mass recovery cycle has further been developed. Results demonstrate that the refrigeration system based on the proposed adsorption equilibrium model for the silica-gel/water pair is characterized by a coefficient of performance numerically predicted to be 152 % and 115 % greater than the corresponding system based on the MIL-101(Cr)/water pair in the stand-alone and integrated configurations respectively. The outcome of the study suggests that MOFs can turn out to be outstanding potential adsorbents for adsorption refrigeration systems provided the intrinsic deficiency of lower thermal conductivity can be resolved without compromising their inherent water uptake.
迄今为止,文献报道的常规和非常规吸附剂材料的吸附平衡模型都没有与实验测量的平衡等温线表现出接近精确的相关性。这不仅会对吸附式制冷系统性能模拟的准确性产生负面影响,也会影响后续对吸附式制冷系统商业应用可行性的评估。本文提出了一种双压力-温度插值模型,该模型与实验获得的平衡等温线的相关程度接近于精确,比以往报道的所有模型都要大,适用于常规和非常规吸附材料。基于所建立的实验验证模型,提出了以水稳定金属有机骨架MIL-101(Cr)为吸附剂、水为制冷剂的吸附剂-吸附-吸附一体化制冷系统的数值性能预测。此外,还建立了一个全新的模型,可以准确地预测质量回收循环的瞬态动力学。结果表明,基于所提出的硅胶/水对吸附平衡模型的制冷系统的性能系数数值预测分别比基于MIL-101(Cr)/水对的制冷系统在单机和集成配置下高152%和115%。研究结果表明,如果能在不影响其固有吸水性的情况下解决导热系数较低的固有缺陷,mof可以成为吸附式制冷系统中出色的潜在吸附剂。
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引用次数: 0
Measurement of gaseous speed of sound for R1234ze(E) and R1234ze(E)+R1336mzz(E) binary mixture using a cylindrical resonator 用圆柱形谐振器测量R1234ze(E)和R1234ze(E)+R1336mzz(E)二元混合物的气体声速
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2026-02-01 Epub Date: 2025-12-01 DOI: 10.1016/j.ijrefrig.2025.11.031
Ying Tan, Xiayao Peng, Yuanyuan Duan, Zhen Yang, Qiang Song
Trans-1,3,3,3-tetrafluoropropene (R1234ze(E)) and trans-1,1,1,4,4,4-hexafluoro-2-butene (R1336mzz(E)), along with their mixtures, represent a new generation of low-global-warming-potential working fluids with significant promise. This study aimed to measure the gaseous speed of sound using Cylindrical Fixed-Path Interferometry. The core component, the cylindrical resonator, had its length and radius precisely calibrated using argon. Combining the calibrated dimensions with the measured resonance frequency, we determined the speed of sound of R1234ze(E) in the temperature range of 313.15 K∼363.15 K and the pressure range of 50 kPa∼1030 kPa with a relative extended uncertainty (k = 2) of 0.029 %. Our comparison with the available speed of sound data revealed that the multiparameter equation of state for R1234ze(E) exhibits a systematic positive bias in the pressure range of 0∼1000 kPa for speed of sound calculation. From the measured speed of sound of R1234ze(E), we calculated its ideal-gas heat capacity and acoustic second virial coefficients. These coefficients were subsequently regressed to obtain molecular parameters for the hard-core square-well molecular potential model, enabling the derivation of the density second virial coefficients. Furthermore, the speed of sound of R1234ze(E)+R1336mzz(E) binary mixture was measured in the temperature range of 313.15 K∼363.15 K and the pressure range of 59 kPa∼800 kPa with a relative extended uncertainty (k = 2) of 0.064 %. By integrating the mixture speed of sound with the pure component properties, we determined the acoustic second virial coefficients of R1234ze(E)+R1336mzz(E). These results provide essential data support for developing a specialized thermodynamic model for the mixture.
反式-1,3,3,3-四氟丙烯(R1234ze(E))和反式-1,1,1,4,4,4-六氟-2-丁烯(R1336mzz(E))及其混合物代表了具有重大前景的低全球变暖潜势的新一代工作流体。本研究旨在利用圆柱固定路径干涉测量法测量声速。核心部件圆柱形谐振器的长度和半径使用氩气进行了精确校准。结合校准尺寸和测量的共振频率,我们确定了R1234ze(E)在温度范围313.15 K ~ 363.15 K和压力范围50 kPa ~ 1030 kPa下的声速,相对扩展不确定度(K = 2)为0.029%。我们与现有声速数据的比较表明,R1234ze(E)的多参数状态方程在0 ~ 1000 kPa的压力范围内显示出系统的正偏置。根据实测的R1234ze(E)的声速,计算了其理想气体热容和声二次维里系数。随后对这些系数进行回归,得到硬岩心方孔分子势模型的分子参数,从而推导出密度次维里系数。此外,R1234ze(E)+R1336mzz(E)二元混合物的声速在313.15 K ~ 363.15 K和59 kPa ~ 800 kPa的压力范围内测量,相对扩展不确定度(K = 2)为0.064%。通过对混合声速与纯分量性质的积分,确定了R1234ze(E)+R1336mzz(E)的二次维里系数。这些结果为建立专门的混合物热力学模型提供了必要的数据支持。
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引用次数: 0
Experimental investigation of helium gas heat exchangers for vibration and thermal noise control in closed-cycle cryostats 封闭循环低温恒温器中氦气换热器振动和热噪声控制的实验研究
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2026-02-01 Epub Date: 2025-12-06 DOI: 10.1016/j.ijrefrig.2025.12.006
Shuo Yang , Hejun Hui , Yanyang Jiang , Meng Guo , Zhenhua Jiang , Yinong Wu , Shaoshuai Liu
Closed-cycle cryostats are widely employed in quantum precision measurement and superconducting quantum computing, where vibration and temperature stability critically affect performance. Gifford–McMahon (GM) cryocoolers, widely used as cold sources, suffer from low-frequency mechanical vibrations and cold head temperature fluctuations, which limit their applicability in precision experiments. To address this challenge, a helium gas heat-exchange chamber was proposed, fully enclosing the GM cold head to eliminate the rigid mechanical connection and enable heat transfer through helium. By employing helium as a non-rigid thermal transfer medium, the chamber enables efficient heat conduction while simultaneously attenuating vibration noise. In this study, the vibration isolation and thermal conduction characteristics of the helium gas heat exchange chamber were systematically investigated. Experimental results show that the chamber effectively isolates the 60 μm peak-to-peak vibration of the GM second-stage cold head, reducing the transmitted vibration to about 400 nm, while maintaining efficient thermal conduction. A minimum temperature of 3.4 K was achieved, with temperature fluctuations suppressed to 0.02 K. These results confirm the dual role of the helium gas heat exchange chamber in vibration isolation and thermal stabilization, providing valuable guidance for the design and optimization of low-vibration closed-cycle cryostats.
闭环低温恒温器广泛应用于量子精密测量和超导量子计算中,振动和温度稳定性对其性能有重要影响。吉福德-麦克马洪(Gifford-McMahon, GM)低温制冷机作为冷源被广泛应用,但其存在低频机械振动和冷头温度波动等问题,限制了其在精密实验中的适用性。为了解决这一挑战,设计了氦气换热室,完全封闭GM冷头,以消除刚性机械连接,并通过氦气进行传热。通过采用氦气作为非刚性传热介质,该腔室实现了高效的热传导,同时减弱了振动噪声。本文对氦气换热室的隔振和导热特性进行了系统的研究。实验结果表明,该腔室有效隔离了GM二级冷头60 μm的峰间振动,在保持高效热传导的同时,将传递振动减小到400 nm左右。最低温度为3.4 K,温度波动被抑制在0.02 K。这些结果证实了氦气换热室在隔振和热稳定方面的双重作用,为低振动闭式低温恒温器的设计和优化提供了有价值的指导。
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引用次数: 0
Experimental performance characterization of R-454B and R-410A in data center server rack mount cooling unit: Energy efficiency and environmental impact assessment R-454B和R-410A在数据中心服务器机架安装冷却单元中的实验性能表征:能效和环境影响评价
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2026-02-01 Epub Date: 2025-12-07 DOI: 10.1016/j.ijrefrig.2025.12.007
Türkan Üçok Erkek , Mehmet Erkek , Mehmet Bora Aydın , Koray Gezer
Data center cooling accounts for a substantial fraction of facility energy consumption, with environmental pressures driving the transition from high-GWP refrigerants to sustainable alternatives. However, rigorous experimental comparisons of next-generation refrigerants under realistic operational conditions remain limited, and existing benchmarking protocols often fail to account for ambient variability across test conditions. This study addresses these gaps by conducting a comprehensive experimental evaluation of an in-rack air-conditioning unit, comparing the conventional refrigerant R410A with the low-GWP alternative R454B (GWP = 466) across 24 tests spanning varied server loads and thermal conditions. The methodology integrates a transparent steady-state detection algorithm for time-series measurement processing, normalized Energy Efficiency Ratio (EER) calculations at fixed reference conditions to enable equitable cross-test comparison, and sensitivity analyses quantifying the influence of ambient and evaporator-side temperatures on system performance. Cooling capacity, raw and normalized EER, facility-level Power Usage Effectiveness (PUE), and Total Equivalent Warming Impact (TEWI) were derived for each refrigerant. Results demonstrate that R454B exhibits load-dependent performance advantages: under high-load conditions (9 kW), R454B achieved 38 % higher EER (∼5.8 vs. ∼4.2) and superior cooling capacity (13 kW vs. 9.5 kW median) compared to R410A, with reduced operational variability. However, under supply-air matched baseline conditions (16–20 °C), both refrigerants exhibited equivalent performance, confirming that R454B's efficiency gains emerge primarily under elevated thermal stress and higher refrigerant flow rates. PUE analysis showed equivalent facility-level efficiency, enabling R454B as a direct drop-in replacement. TEWI analysis revealed that indirect emissions dominate climate impact (>90 %), establishing operational efficiency optimization as the primary environmental lever, with refrigerant selection providing secondary benefits through GWP reduction. These findings support the adoption of R454B in high-load data center environments, while the transparent methodological framework provides a reproducible benchmark for condition-aware refrigerant evaluation in mission-critical cooling systems.
数据中心冷却占设施能源消耗的很大一部分,环境压力推动了从高gwp制冷剂向可持续替代品的转变。然而,在实际操作条件下对下一代制冷剂进行严格的实验比较仍然有限,现有的基准测试协议往往无法考虑测试条件下的环境变化。本研究通过对机架式空调机组进行全面的实验评估,将常规制冷剂R410A与低GWP替代R454B (GWP = 466)进行了24次测试,涵盖了不同的服务器负载和热条件,从而解决了这些差距。该方法集成了用于时间序列测量处理的透明稳态检测算法,固定参考条件下的归一化能效比(EER)计算,以实现公平的交叉测试比较,以及量化环境温度和蒸发器侧温度对系统性能影响的敏感性分析。每种制冷剂的制冷量、原始和标准化EER、设施级功率使用效率(PUE)和总等效变暖影响(TEWI)均得到了推导。结果表明,R454B具有负载相关的性能优势:与R410A相比,在高负载条件下(9 kW), R454B的EER比R410A高38% (~ 5.8 vs. ~ 4.2),冷却能力更强(13 kW vs. 9.5 kW中值),同时降低了运行变异性。然而,在送风匹配的基线条件下(16-20°C),两种制冷剂表现出相同的性能,这证实了R454B的效率提高主要是在更高的热应力和更高的制冷剂流量下实现的。PUE分析显示,R454B具有相同的设施级效率,可以直接替代R454B。TEWI分析显示,间接排放主导了气候影响(> 90%),将运行效率优化作为主要的环境杠杆,制冷剂选择通过降低全球升温潜能值提供次要效益。这些发现支持在高负载数据中心环境中采用R454B,而透明的方法框架为关键任务冷却系统的状态感知制冷剂评估提供了可重复的基准。
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International Journal of Refrigeration-revue Internationale Du Froid
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