JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2016
·
IF 1.835
Xiaohong Han,Zhangzhang Yang,Zanjun Gao,Wenjie Guan,Guangming Chen
Fluoroethane (HFC-161) is one of the most promising alternative refrigerants because of its excellent environmental and thermodynamic properties. It was considered as one of the most promising absorption working fluids in the absorption refrigeration. To make a better application of the refrigerant in absorption refrigeration systems, suitable absorbents should be selected for matching HFC-161. Vapor–liquid equilibrium (VLE) data is the key of the chemical engineering simulation and the refrigeration cycle calculation. On the basis of these, the vapor–liquid equilibrium data for the mixture of HFC-161 + dimethyl ether triethylene glycol were obtained at temperatures from 293.15 to 353.15 K by using a recirculation apparatus. The VLE data were then correlated by the Peng−Robinson (PR) equation of state combined with the modified Huron-Vidal first order (MHV1) mixing rule and nonrandom two liquid (NRTL) model. The experimental results had a good consistency with calculated values. Phase behaviors of HFC-161 combined with different absorbents were compared in this paper.
研究领域:
化学工程
·
制冷技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Jin Wang,Longhui Fang,Yutao Ban,Xiangyang Liu,Maogang He
Due to their high global warming potential (GWP), hydrofluorocarbons (HFCs) are included in various regulations as substances to be phased down. Gas separation membrane technology is expected to provide a better choice for refrigerant separation. In this study, a series of metal-organic frameworks (MOFs)/ polydimethylsiloxane (PDMS) mixed matrix membranes (MMMs) were prepared for the separation of the refrigerant blend R454A (GWP = 145), which consists of a near-zeotropic difluoromethane (R32, GWP = 675) and 2,3,3,3-tetrafluoropropene (R1234yf, GWP = 4). ZIF-71-NH 2 was prepared for the first time by solvent-assisted ligand exchange (SALE), and then ZIF-71-NH 2 @ Ionic Liquid (IL) was prepared by embedding [C 2 mim][BF 4 ] into the pores of ZIF-71-NH 2 by capillary action method. The results showed that a hydrogen bonding network was established between the amino group and PDMS, which improved the interfacial compatibility, and reduced the pore size of ZIF-71, which contributed to an excellent gas separation performance of ZIF-71-NH 2 /PDMS MMMs. Restricting [C 2 mim][BF 4 ] to the ZIF-71-NH 2 pore can further reduce its pore size, and enhance R32/R1234yf separation performance due to the high selective solubility for R32 and R1234yf. The selectivity of 10 wt% ZIF-71-NH 2 /PDMS MMM is 25.6 % over that of 10 wt% ZIF-71/PDMS MMM. The selectivity of ZIF-71-NH 2 @IL/PDMS MMM is 38.3 % higher than that of ZIF-71-NH 2 /PDMS MMM. The ZIF-71-NH 2 /PDMS and ZIF-71-NH 2 @IL/PDMS MMMs exhibited the most excellent R32/R1234yf separation performance compared with the data currently published in the literature. Moreover, both designed MMMs demonstrated excellent resistance to ageing.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
Journal of the American Chemical Society
·
2024
·
IF 14.4
Bingjie Wang,Xinyang Liu,Fengxia Hu,Jian-tao Wang,Junsen Xiang,Peijie Sun,Jing Wang,Jirong Sun,Tongyun Zhao,Zhaojun Mo,Jun Shen,Yunzhong Chen,Qingzhen Huang,Baogen Shen
Adiabatic demagnetization refrigeration (ADR) based on the magnetocaloric effect (MCE) is a promising technique to achieve cryogenic temperature. However, magnetic entropy change (ΔSM), the driving force of ADR, remains far below theoretical −ΔSM = nRln(2J + 1)/MW for most magnetic refrigerants. Here, we report giant MCE in orthorhombic EuCl2, where a ferromagnetic ground state with excellent single-ion behavior of Eu2+ and free spins has been demonstrated by combining ab initio calculations with Brillouin function analysis and magnetic measurements. Consequently, a record-high −ΔSM ∼ 74.6 J·kg–1·K–1 (1.8 K) at 5 T was experimentally achieved, approaching 96% of the theoretical limit (77.5 J·kg–1·K–1). At a lower field of 1 T, EuCl2 also achieves the highest-ever record of −ΔSM ∼ 36.8 J·kg–1·K–1. Further, direct quasi-adiabatic demagnetization measurements demonstrate that its large −ΔSM allows EuCl2 to maintain a long holding time at sub-Kelvin temperature (∼346 mK), surpassing all previously reported materials. These superior magnetocaloric performances position EuCl2 as an attractive cryogenic refrigerant.
研究领域:
材料科学
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物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Guo Haowen,Wu Xilei,Zhuang Yuan,Guo Zhikai,Han Xiaohong,Chen Guangming
With the development of the alternative refrigerant technology, the thermophysical properties of hydrofluoroolefin (HFO) refrigerants have attracted much attention. Among these thermophysical properties, the thermal conductivity of refrigerants is a key parameter of phase change and convective heat transfer process of refrigeration cycle and also an important basis for the selection of alternative refrigerants. Therefore, studies on the thermal conductivity of refrigerants are of great significance. At present, many studies emphasized on the thermal conductivity of refrigerants, but there is no public report on the investigation of the saturated liquid thermal conductivity of HFO-1336mzz(E). On the basis of the current state, the thermal conductivities of HFO-1336mzz(E) by means of the general models were first predicted, then the thermal conductivities of the saturated liquid phase of HFO-1336mzz(E) in the temperature range of 253.15–353.15 K were measured based on the transient hot wire method. A comparison of prediction and experimental data was developed, and a special equation of the saturated liquid thermal conductivity for HFO-1336mzz(E) was recommended.
研究领域:
热力学
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制冷技术
✓ 已验证
DOI
高影响因子
International Journal of Refrigeration
·
2017
·
IF 2.779
Lingnan Lin,Hao Peng,Zheng Chang,Guoliang Ding
Nanolubricant–refrigerant mixture used in vapor-compressor refrigeration system undergoes continuous alternation processes of condensation and evaporation, during which it degrades gradually as a result of the nanoparticle deposition. This paper quantitatively evaluates the degradation of nanolubricant–refrigerant mixture during continuous alternation processes of condensation and evaporation, and investigates the effects of lubricant mass fraction, nanoparticle mass fraction, heating condition, and cooling condition on degradation. TiO 2 /NM56/R141b is chosen as the nanolubricant–refrigerant mixture for experiments. The experimental conditions cover lubricant mass fraction of 5–20%, nanoparticle mass fraction of 0.2–1.0%, heating temperature of 50–80 o C, and cooling temperature of 5–15 o C. The experimental results show that nanolubricant–refrigerant mixture degrades by 28–77% after 20 alternation times under present experimental conditions; besides, the degradation in long-term period can be reduced at conditions of higher lubricant mass fraction, lower nanoparticle mass fraction, lower heating temperature, or lower cooling temperature.
研究领域:
热力学
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材料科学
·
制冷工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2023
·
IF 3.9
Gongran Ye,Mingxi Ye,Xilei Wu,Yuhao Yan,Hongsheng Ouyang,Xiaohong Han
Reclamation of mixed refrigerants can effectively reduce high global warming potential (GWP) fluorinated gases (F-gases) emissions. Two organic liquids (OLs), Dimethylformamide (DMF) and N, N-Dimethylacetamide (DMAC), were proposed to explore the possibility of separating high GWP and near-azeotropic mixture R410A (50 wt% R32 (difluoromethane) + 50 wt% R125 (pentafluoroethane)) by absorption. Solubilities of R125 in DMF and DMAC were measured from 283.15 to 333.15 K and well correlated with the five-parameter non-random two-liquid (NRTL) activity coefficient model. Ideal selectivity for R32 + R125 of DMAC were higher than that of DMF. Five ionic liquids (ILs) and DMAC on the Pareto front showed good overall performance (integration of capacity and selectivity) for separating R410A, and in the area below the Pareto front, the overall performances of the other solvents were not as good as those from the Pareto front. Subsequently, based on DMAC, 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF 6 ]), 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide ([EMIM][Tf 2 N]) and 1-ethyl-3-methylimidazolium thiocyanate ([EMIM][SCN]), the extractive distillation processes for R410A separation were simulated and evaluated in Aspen Plus. Results showed DMAC was a suitable choice of extractant nowadays due to the lower viscosity and consumption than ILs and the mature corresponding R410A separation process. ILs may be the mainstream extractant for R410A separation in the future, once the price of some ILs such as [BMIM][PF 6 ] can be reduced to $30/kg, the separation process using ILs as extractants will cost less than that of DMAC. Heat pump technology can be further applied for energy integration in the corresponding process of ILs with high ideal selectivity such as [EMIM][SCN]. Thermodynamic and economic analysis of OLs and ILs could provide the key information for the separation of commercial refrigerant R410A, which can also be used as a benchmark to screen more efficient extractants.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
·
IF 6.9
Xiangyang Liu,Jin Wang,Longhui Fang,Yutao Ban,Maogang He
Due to the high Global Warming Potential (GWP) of hydrofluorocarbons (HFCs), the Kigali Amendment to the Montreal Protocol explicitly calls for the phase-out or limited use of HFCs, and the replacement of HFCs by hydrofluoroolefins (HFOs) is imminent. Therefore, it is particularly significant to develop new technology to separate valuable difluoromethane (R32, GWP = 675) from the near-azeotropic refrigerant blend R410A (GWP = 2088), because the traditional distillation is not applicable. In this work, aiming to enhance the separation performance of mixed matrix membrane (MMMs) for R410A, 5-fluorobenzimidazole was introduced into ZIF-71 by the solvent assisted linker exchange (SALE) method for the first time to reduce the pore size of fluorinated ZIF-71 by benzene rings and form hydrogen bonds between R32 with ZIF-71. A novel series of MMMs consisting of fluorinated ZIF-71 and Poly(ether-block-amide) ®1657 (Pebax®1657) polymer were prepared to separate the components of the R410A. The separation performance of the MMMs was investigated at different feed pressures and filler loading. The results showed that the introduction of 5-fluorobenzimidazole contributed to a significant increase in R32 permeability and R32/R125 selectivity of the MMMs compared to pure Pebax membrane. The 15 wt% ZIF-71-F/Pebax MMM showed the best separation performance with R32/R125 selectivity up to 26.6, four times that of pure Pebax membrane and twice that of ZIF-71/Pebax MMM. The ZIF-71-F/Pebax MMM have outstanding data on R32/R125 selectivity and no significant disadvantage in permeability, far exceeding the reported separation performance of membranes for R410A. This confirms that the application of fluorinated metal organic frameworks (MOFs) to the separation of refrigerant blends is a promising strategy.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
·
2015
·
IF 4.844
Hao Peng,Lingnan Lin,Guoliang Ding
The aggregation behavior of nanoparticles is related to the stability and the heat transfer performance of nanorefrigerant during long-term operation. The objective of this study is to experimentally investigate the influences of primary particle parameters and surfactant on the aggregation of nanoparticles in nanorefrigerant. The refrigerant and nanoparticles used for the nanorefrigerant preparation were R141b and TiO 2 , respectively. The primary particle size included 25, 40, 60 and 100 nm. The primary particle concentration was from 25 to 500 mg L −1 . Three surfactants including the anionic, cationic and nonionic surfactants were used in the experiments. The time evolution of particle sizes were measured by dynamic light scattering method. The experimental results indicate that the particle size can reach steady-state with the elapse of time. The steady-state hydrodynamic diameter increases by 127.6% with the increase of the primary particle size from 25 to 100 nm. The primary particle concentration has slight influence on the steady-state particle size. The influence of surfactant concentration on the steady-state particle size changes with the surfactant type.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CRYOGENICS
·
2022
·
IF 2.134
Yuwei Chen,Wang Liu,Jingcheng Feng,Ruixin Guo,Feidi Fan,Jun Shen,Guochun Zhang,Heng Tu
A series of lanthanide-rich oxyborates LiLn 6 O 5 (BO 3 ) 3 (LLnOB, Ln = Gd, Tb, Dy, and Ho) have been synthesized using high temperature solid state method. Their magnetic and magnetocaloric properties were investigated upon magnetic susceptibility ( χ ), magnetization ( M ), and isothermal magnetic entropy change ( −ΔS m ) measurements. The maximum − ΔS m, max of LiGd 6 O 5 (BO 3 ) 3 is 44.7 J kg −1 K −1 at 4 K and Δμ 0 H = 9 T, which is higher than the one of commercial Gd 3 Ga 5 O 12 (GGG, −ΔS m, max = 41.8 J kg −1 K −1 at 2 K for Δμ 0 H = 9 T). For LiHo 6 O 5 (BO 3 ) 3 , −ΔS m, max is 14.12 J kg −1 K −1 at 3 K and Δμ 0 H = 2 T, which is also larger than that of Ho 3 Ga 5 O 12 (HoGG, − ΔS m, max = 4.38 J kg −1 K −1 at 2 K for Δμ 0 H = 2 T) and Dy 3 Ga 5 O 12 (DGG, − ΔS m, max = 11.0 J kg −1 K −1 at 2 K for Δμ 0 H = 2 T). These results indicate that LiGd 6 O 5 (BO 3 ) 3 and LiHo 6 O 5 (BO 3 ) 3 may be competitive candidates for applications as magnetic refrigerants. Moreover, thermal stability, infrared spectrum (IR), and ultraviolet–visible-near-infrared diffuse reflectance spectrum (UV–Vis-NIR) were carried out to characterize the title compounds.
研究领域:
材料科学
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物理学
·
化学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 33
·期 2
·2208206
·
IF 19.924
Chaolin You,Wenbin Wu,Wangsheng Yuan,Peng Han,QianYu Zhang,Xi Chen,Xinhai Yuan,Lili Liu,Jilei Ye,Lijun Fu,Yuping Wu
Traditional aqueous energy storage devices are difficult to operate at low temperatures owing to the poor ionic conductivity and sluggish interfacial dynamics in frozen electrolytes. Herein, the low-cost brine refrigerants for food freezing and preservation as electrolytes, and unexpectedly realize high ionic conductivity and stable operation of an aqueous storage device at low temperatures are demonstrated. A CaCl 2 brine refrigerant electrolyte (BRE) with a low freezing point −55 °C and high ionic conductivity (10.1 mS cm −1 at −50 °C) is developed for supercapacitors (SCs), which retains 80% of the room temperature capacity at −50 °C and exhibits ultra-long cycle life with excellent capacity retention of 92% over 98,500 cycles, outperforming the other SCs which can be operated below −40 °C in literature. Moreover, the SCs with MgCl 2 and NaCl BREs can also be operated successfully with excellent cycle stability and high-capacity retention at low temperatures of −30 and −20 °C, respectively. Fundamental correlation between various cations and their effect on the freezing point reduction of aqueous electrolytes is revealed via Raman investigation and molecular dynamics simulations. This study provides a rational design strategy for green, inexpensive, and safe low-temperature aqueous electrolytes for energy storage devices.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Yanjun Sun,Xingdan Wang,Qiming Wei,Xiaopo Wang
Owing to zero ozone depletion potential (ODP) and extremely low global warming potential (GWP), 2,3,3,3-tetrafluoroprop-1-ene (R1234yf) and trans-1,3,3,3-tetrafluoropropene (R1234ze(E)) as most potential refrigerants have attracted much interest in refrigeration and air conditioning (RAC). For a better insight into the refrigeration performance using R1234y and R1234ze(E) as refrigerants, the thermophysical properties of refrigerant/lubricant blends should be well understood, especially the viscosities of the refrigerant/lubricant blends. Using a self-designed-capillary apparatus, the viscosity measurements were performed for blends of POE85 oil saturated with R1234y and R1234ze(E) between 303.15 and 343.15 K. Viscosities of both R1234yf/POE85 and R1234ze(E)/POE85 have a similar trend. With an increase in solubility, the viscosity plunges dramatically at the beginning and then drops slowly. The results indicate that the refrigerant dissolved in oil has a large impact on the lubricant viscosity. The experimental data were successfully correlated by Eyring’s absolute rate theory coupled with modified two-suffix-Margules (Eyring-MTSM model).
研究领域:
热力学
·
制冷工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Sensor Research
·
2025
·
IF 3.5
Jiahong Wen,Yaxin Wang,Ruoning Chu,Jinhai Li,Ze Chen,Yongjun Zhang,Xiaoyu Zhao,Qi-Qi Fu
Freon refrigerants, whose leakage will cause serious safety and environmental issues, have an urgent need of developing leakage detection technologies. Conventional metal oxide semiconductor (MOS) gas sensors exhibit limited efficacy in detecting halogenated Freons due to their chemical inertness and weak charge-transfer interactions. While recent innovations employing mesoporous γ-Al 2 O 3 overlayers have enabled Freon detection via catalytic decomposition sensing mechanism, the achieved sensing performance remains suboptimal. In this work, this issue is addressed by engineering a Pd-doped mesoporous γ-Al 2 O 3 /SnO 2 (Pd-γ-Al 2 O 3 /SnO 2 ) gas sensor. The doped Pd atoms not only accelerate the decomposition of Freon molecules on the catalytic layer but also induce the Schottky-barrier effect in the SnO 2 sensing layer. Benefiting from the synergistic effect, the Pd-γ-Al 2 O 3 /SnO 2 gas sensor shows outstanding response, good stability, repeatability, selectivity, and rarely-reported universality in sensing different Freon gases. Notably, a valuable solution is demonstrated in the leakage detection of next-generation refrigerants, Freon R1234yf. The sensing mechanism is deduced by exhaust gas components identification. These results highlight the promising potential for addressing the real-world needs of Freon refrigerant leakage detection technology.
研究领域:
材料科学
·
化学传感器
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环境监测
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）