使用 R134a、R1234yf 和 R513A 的光滑管和微鳍管中流动沸腾传热的实验比较

IF 3.5 2区 工程技术 Q1 ENGINEERING, MECHANICAL International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-08-31 DOI:10.1016/j.ijrefrig.2024.08.028
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引用次数: 0

摘要

为了满足对环境可持续和高效制冷系统的迫切需求,本研究调查了低全球升温潜能值制冷剂 R1234yf 和 R513A 与高全球升温潜能值制冷剂 R134a 的性能对比,重点关注光滑管和微鳍管中流动沸腾时的传热系数(HTC)和压降。实验装置包括内径 6.14 毫米、长度 500 毫米的管子。收集数据的工作条件范围很广,包括质量通量(170 至 495 kg/m²s)、热通量(10 至 40 kW/m²)、饱和温度(15 °C 和 25 °C)以及蒸汽质量(0.15 至 1.0)。在质量流量为 170 kg/m²s、热流量为 23 kW/m²、饱和温度为 15 °C 的特定情况下,结果表明,与光滑管材相比,微鳍管的 HTC 增强率高达 64%。不过,R134a 的 HTC 比 R1234yf 和 R513A 高,分别高出约 5 % 和 3 %。相比之下,R134a 的压降比 R1234yf 高约 8%。在光滑管中,R134a 的压降略高于 R513A,而在微鳍管中,两者的趋势相似,但差异更为明显。这项研究全面探讨了微鳍管在使用这些制冷剂时的性能,为设计先进的制冷系统提供了重要的启示,从而在环境责任与能源效率之间取得平衡。这些发现与预测的相关性进行了验证,显示出良好的一致性。
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Experimental comparison of flow boiling heat transfer in smooth and microfin tubes using R134a, R1234yf, and R513A
Addressing the urgent need for environmentally sustainable and efficient refrigeration systems, this study investigates the performance of low-GWP refrigerants R1234yf and R513A in comparison to the high-GWP refrigerant R134a, focusing on the heat transfer coefficient (HTC) and pressure drop during flow boiling in smooth and microfin tubes. The experimental setup involves tubes with a 6.14 mm internal diameter and 500 mm length. Data were collected across a broad range of operating conditions, including mass fluxes from 170 to 495 kg/m² s, heat fluxes from 10 to 40 kW/m², saturation temperatures of 15 °C and 25 °C, and vapor qualities from 0.15 to 1.0. In a specific case with a mass flux of 170 kg/m² s, heat flux of 23 kW/m², and a saturation temperature of 15 °C, the results indicate that the microfin tube achieves an HTC enhancement of up to 64 % compared to smooth tubes. However, R134a exhibits a higher HTC than R1234yf and R513A, approximately 5 % and 3 % higher, respectively. In contrast, R134a presents a higher pressure drop than R1234yf by about 8 %. While the pressure drop for R134a is slightly higher than R513A in the smooth tube, the microfin tube shows similar trends but more pronounced differences. This study comprehensively explores microfin tube performance with these refrigerants, offering critical insights for designing advanced refrigeration systems that balance environmental responsibility with energy efficiency. These findings were validated against predicted correlations, showing good agreement.
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来源期刊
CiteScore
7.30
自引率
12.80%
发文量
363
审稿时长
3.7 months
期刊介绍: The International Journal of Refrigeration is published for the International Institute of Refrigeration (IIR) by Elsevier. It is essential reading for all those wishing to keep abreast of research and industrial news in refrigeration, air conditioning and associated fields. This is particularly important in these times of rapid introduction of alternative refrigerants and the emergence of new technology. The journal has published special issues on alternative refrigerants and novel topics in the field of boiling, condensation, heat pumps, food refrigeration, carbon dioxide, ammonia, hydrocarbons, magnetic refrigeration at room temperature, sorptive cooling, phase change materials and slurries, ejector technology, compressors, and solar cooling. As well as original research papers the International Journal of Refrigeration also includes review articles, papers presented at IIR conferences, short reports and letters describing preliminary results and experimental details, and letters to the Editor on recent areas of discussion and controversy. Other features include forthcoming events, conference reports and book reviews. Papers are published in either English or French with the IIR news section in both languages.
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