Al2O3/R1234yf、TiO2/R1234yf和CuO/R1234yf纳米制冷剂的密度研究

IF 4.2 Q2 NANOSCIENCE & NANOTECHNOLOGY
Bibin Bs, Edison Gundabattini
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引用次数: 2

摘要

纳米强化制冷剂是制冷系统中很有前途的传热流体之一。它有能力提高蒸汽压缩制冷和空调系统的效率。在换热应用中,流体的密度对确定各种换热特性(如雷诺数、努塞尔数、摩擦系数和压力损失)起着至关重要的作用。与热导率和粘度相比,纳米流体密度的测定在研究中受到的关注很少。研究了悬浮在2,3,3,3-四氟丙烯(R1234yf)中的氧化铝(Al2O3)、二氧化钛(TiO2)和氧化铜(CuO)纳米颗粒的液气密度。采用Pak和Cho模型,分别考察了基础制冷剂中颗粒体积浓度在1% ~ 5%和温度在273 ~ 323 K范围内变化时纳米制冷剂的密度。通过不同研究人员对不同纳米制冷剂的实验研究,对模型进行了验证。分析结果表明,在5%颗粒浓度下,CuO/R1234yf纳米制冷剂的液、气密度分别比Al2O3/R1234yf高10.3%和62.93%。从液体和蒸汽密度的角度来看,CuO/R1234yf纳米制冷剂优于Al2O3/R1234yf和TiO2/R1234yf。结果还表明,在308 K时,加入R1234yf纳米制冷剂的CuO液相密度比R134a和R141b分别提高了12.99%和8.65%。因此,CuO/R1234yf显著提高了制冷系统的性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigation on the density of Al2O3/R1234yf, TiO2/R1234yf and CuO/R1234yf nano-refrigerants
Nano-enhanced refrigerant is one of the promising heat transfer fluids in refrigeration systems. It has the capability to boost the efficiency of vapour compression refrigeration and air conditioning systems. In heat transfer application, the density of the fluid plays a crucial role in identifying various heat transfer characteristics such as the Reynolds number, Nusselt number, the friction factor and the pressure loss. Compared to thermal conductivity and viscosity, determining the density of nanofluids has received very less attention in research. The liquid and vapour densities of alumina (Al2O3), titanium dioxide (TiO2) and cupric oxide (CuO) nanoparticles suspended in 2,3,3,3-tetrafluoropropene (R1234yf) are investigated in this study. The Pak and Cho model was adopted to examine the densities of nano-refrigerants as the volume concentration of particles in the base refrigerant and temperature varies from 1% to 5% and 273 to 323 K respectively. The models are validated using the experimental studies conducted by various researchers on different nano-refrigerants. The analysis results indicated that the liquid and vapour densities of CuO/R1234yf nano-refrigerant are 10.3% and 62.93% greater than that of Al2O3/R1234yf at 5% particle concentration. From the liquid and vapour density point of view, the CuO/R1234yf nano-refrigerant is superior over Al2O3/R1234yf and TiO2/R1234yf. Results also indicated that at 308 K the liquid phase density of CuO added with R1234yf nano-refrigerant is higher by 12.99% and 8.65% than R134a and R141b respectively. Hence CuO/R1234yf significantly enhances the performance of refrigeration systems.
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来源期刊
CiteScore
6.00
自引率
1.70%
发文量
24
期刊介绍: Proceedings of the Institution of Mechanical Engineers Part N-Journal of Nanomaterials Nanoengineering and Nanosystems is a peer-reviewed scientific journal published since 2004 by SAGE Publications on behalf of the Institution of Mechanical Engineers. The journal focuses on research in the field of nanoengineering, nanoscience and nanotechnology and aims to publish high quality academic papers in this field. In addition, the journal is indexed in several reputable academic databases and abstracting services, including Scopus, Compendex, and CSA's Advanced Polymers Abstracts, Composites Industry Abstracts, and Earthquake Engineering Abstracts.
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