JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2019
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IF 2.298
Yibo Fang,Zanjun Gao,Kangli Bao,Jiongliang Huang,Xiaosheng Ji,Xiaohong Han,Guangming Chen
The working pairs of HFCs + organic absorption solvents are commonly used in absorption systems. In this work, the vapor–liquid equilibrium (VLE) data of HFC-32 + DMETrEG at (293.15–343.15) K and HFC-32 + NMP at (323.15–343.15) K were measured in a dual cycle apparatus. The VLE data were correlated by Antione-type equation, NRTL, and PR + MHV1 + NRTL model, respectively. The predicted VLE data showed a good agreement with the experimental VLE data. NRTL model was recommended to predict the VLE data and characteristic of solution for HFC-32 + DMETrEG and HFC-32 + NMP, compared to PR + MHV1 + NRTL model. The comparison of VLE characteristics for five binary mixtures (HFC-32 + DMETrEG, HFC-32 + NMP, HFC-32 + DMF, HFC-32 + DMAC, and HFC-32 + DMEDEG) was carried out. The compared results showed that the system pressures of HFC-32 + DMETrEG and HFC-32 + NMP were lower than other three mixtures, and the negative deviations from Raoult’s law of HFC-32 + DMETrEG and HFC-32 + NMP were larger than the others, which indicated that the two mixtures were more suitable as the working fluids for absorption system.
研究领域:
化学工程
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热力学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
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2023
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IF 9
Qiang Ji,Yikai Wang,Yonggao Yin,Mu Wang,Chunwen Che,Bowen Cao,Wanhe Chen
The compression-absorption cascade system (CACS) is an efficient way to use waste heat or renewable energy. However, most of the current studies are all based on heating scenarios, and the cooling characteristics of CACS have not been reported. In terms of absorption working pairs, ionic liquids (ILs) have great potential to become alternative working fluids for absorption systems , but one of the factors restricting the large-scale application is their high price. Seeking effective strategies to reduce economic constraints while ensuring the excellent performance of IL working pairs will become a hot topic in the future. In order to overcome the application limit of ILs, a feasible strategy is proposed which the relatively cheap salt is used to replace part of the expensive IL and they are employed together as the absorbent. In this work, the vapor-liquid equilibrium data of novel IL working fluid LiBr/[EMIM][OAC]/H 2 O is measured experimentally, and the cooling performance of CACS with the proposed working pair is analyzed. The results show that the cooling efficiency of CACS is 0.738–0.849, which is commonly higher than traditional absorption chillers. As for comparing with reference working fluids, the novel working pair can improve the maximum performance by 1.80%–46.81%. In addition, the crystallization problem can be overcome to some extent compared with LiBr/H 2 O under the same absorption ability, and as for comparing with [EMIM][OAC]/H 2 O, the economic limitation can be alleviated. This work can be used to ease the economic limit of ILs due to the immature market right now, and give a reference for seeking a satisfactory cooling method of buildings in the context of carbon neutrality.
研究领域:
能源工程
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制冷技术
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Refrigeration
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2025
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IF 3.8
Yutong Gong,Feng Liu,Jun Sui,Yanlong Lv,Yuhao Wang
To explore the application performance of ternary ionic liquid-based working pairs in absorption heat transformers, this study measured the saturated vapor pressure of H 2 O/LiBr+[EMIM][Ac], H 2 O/LiBr+[BMIM][I], and H 2 O/LiBr+[EPy][Br] solutions at temperature ranging from 25 to 200°C under different concentrations. The experimental data were correlated with an absorption heat exchanger model using the Non-Random Two-Liquid (NRTL) activity coefficient model and enthalpy calculation equations. Sensitivity analyses were conducted on condensation, evaporation/generation, and absorption temperature, with comparisons made to the conventional LiBr/H 2 O working pair. The results demonstrated that the traditional LiBr/H 2 O solution exhibited higher coefficients of performance (COP) and exergetic efficiency (ECOP) under varying condensation, evaporation, and absorption temperatures, but its applicable heat source temperature range was narrow, and it showed no advantage under high output temperature requirements. In contrast, the three ternary IL working pairs exhibited lower COP and ECOP values compared to LiBr/H 2 O, but H 2 O/LiBr+[BMIM][I] and H 2 O/LiBr+[EPy][Br] demonstrated broader applicable heat source and output temperature ranges. Among them, H 2 O/LiBr+[BMIM][I] exhibited the best performance, achieving superior system efficiency at heat source temperatures above 102°C, making it suitable for systems operating with unstable waste heat sources. Additionally, H 2 O/LiBr+[BMIM][I] achieved the highest optimal ECOP of 0.58 at an absorption temperature of 215°C, meeting high output temperature demands and offering significant temperature lift advantages. This study provides critical insights for the application of ternary ionic liquid working pairs in absorption heat transformers. Future research could incorporate system structure optimization and environmental-economic analysis to provide stronger scientific foundations for the application of ternary ionic liquid working pairs.
研究领域:
化学工程
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热力学
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能源系统
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传热学
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离子液体
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制冷与空调
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2021
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IF 2.694
Gongran Ye,Yibo Fang,Yalun Li,Zhikai Guo,Lin Wang,Xiaohong Han
The absorption refrigeration system (ARS) was important for energy saving, which can be driven by low-grade energy. In this work, the mixtures of trans-1,3,3,3-tetrafluoropropene (R1234ze(E)) + N-methyl-2-pyrrolidone (NMP) and R1234ze(E) + triethylene glycol dimethyl ether (DMETrEG) were considered as the promising new working fluids for ARS. The vapor–liquid equilibrium (VLE) data of R1234ze(E) + DMETrEG and R1234ze(E) + NMP binary mixtures were measured using a liquid-recirculation apparatus from 293.15 to 353.15 K. The VLE data were correlated by the five-parameter non-random two-liquid activity coefficient model, and the correlated results showed a good agreement with the experimental VLE data. The average absolute relative deviation and maximum absolute relative deviation of the pressure were 1.70 and 5.11% for R1234ze(E) + NMP and 1.30 and 3.22% for R1234ze(E) + DMETrEG, respectively. The two binary mixtures exhibited positive deviations from Raoult’s law.
研究领域:
热力学
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化学工程
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制冷技术
✓ 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）