APPLIED THERMAL ENGINEERING
·
2022
·
IF 6.465
Chunting Zhou,Fengze Lv,Zihan Wan,Yanan Wang,Chunhuan Luo
To improve the flexibility of absorption thermal energy storage (ATES) cycle, including lower the generation temperature, larger the operating temperature region and combined cooling and heating for 24 h, a double-effect/two-stage absorption refrigeration and thermal energy storage hybrid cycle using LiBr/H 2 O and LiBr-[BMIM]Br/C 2 H 5 OH working fluids is proposed in this paper. The cycle includes an absorption heat pump (AHP) sub cycle and an ATES sub cycle. Based on the measured thermophysical properties, the thermodynamic performance of this new cycle under different working conditions was calculated by MATLAB. According to the results, the hybrid cycle obtained a low generation temperature of 385 K, attributed to the utilization of the low-temperature working fluid LiBr-[BMIM]Br/C 2 H 5 OH. Moreover, the evaporation temperature of 268.15 K expanded the operating region of the hybrid cycle, and the highest COP and ESD of 2.37 and 394 kJ·kg −1 were obtained at that temperature, respectively. More importantly, the cycle realized combined cooling and heating all day long, with a cooling output temperature range of 268.15–278.15 K and a heating output temperature range of 321–344 K, which can fully meet the demands of commercial and civilian applications. To further verify the feasibility of the cycle, the model sensitivity and chemical potential achieved in the hybrid cycle were analyzed.
研究领域:
能源工程
·
热力学
✓ 已验证
DOI
高影响因子
ENERGY CONVERSION AND MANAGEMENT
·
2024
·
IF 9.9
Xiaoran He,Bing Xue,Ruixun Wei,Kanglong Liao,Guangyao Li,Taibao Zhao
Adsorption heat pump is a promising technology to generate steam from the recovery of low-grade waste heat. Although the direct contact heat exchange method has been proposed in the adsorption heat pump, the presence of free water within the adsorbents limits the improvement of system performance. In this work, a shell-core structure was prepared using a hydrothermally stable zeolite 13X as the core and a hydrophobic bio-based polyurethane as the shell through a drum coating method. The Scanning Electron Microscopy results proved the successful preparation of shell-core zeolites with a shell layer thickness ranging from 7.5 to 9.0 μm. Thermogravimetric analysis results showed that the shell-core zeolite exhibited good thermal stability up to 300 °C. The water content is reduced by 69 % compared to unmodified zeolite 13X. Cyclic operation based on a packed bed of the shell-core zeolite showed 218 ∼ 233 °C steam generated from hot water at 72 °C, while 140 °C hot dry gas was used for regeneration. The steam temperature and generation rate of the shell-core zeolite were increased by 22.7 % and 21.6 %, respectively. The mass of free water within the packed bed was greatly reduced by 49.3 %, which resulted in a 49.4 % reduction in regeneration consumption. The Coefficient of Performance for Heating and Specific Heating Power of the shell-core zeolite were maximized by 91 % and 12.3 %, respectively. The tiny protrusions on the surface of the silicon dioxide-modified shell and the air within the pores created an air film that effectively prevented liquid water. Consequently, water could only enter the adsorbent in the form of water vapor. Overall, shell-core zeolite is a suitable adsorbent that can greatly reduce regeneration energy consumption and effectively improve system efficiency. It is foreseeable that the adsorbent preparation method presented in this work will provide a means for advancing the fields of coated slow-release fertilizers and gas separation.
研究领域:
材料科学
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能源工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Refrigeration
·
2025
·
IF 3.8
Yanlong Lv,Yutong Gong,Feng Liu,Yuhao Wang,Yunze Hao,Jiyuan Zhou,Jun Sui
Imidazolium-based ionic liquids exhibit significant potential as working fluids in absorption heat transformers, owing to their superior solubility and thermal stability. In this study, the corrosion rates of nine imidazolium-based ionic liquids, with mass concentrations ranging from 30% to 70%, were systematically evaluated. Based on these corrosion rate evaluations, further thermodynamic assessments were conducted on four key working pairs, namely [EMIM][MeSO 3 ]+H 2 O, [EMIM][Ac]+H 2 O, [EMIM]Cl+H 2 O, and [EMIM][DEP]+H 2 O, involving parameters including density, viscosity, specific heat capacity, and thermal stability. Polynomial fitting was applied using the least squares method. The results showed that the density, viscosity and specific heat capacity of these four working pairs were in the range of 0.98-1.18 g·cm −3 , 0.5-15.5 mPa·s and 2.3-4.0 J·g −1 ·°C −1 , respectively. Furthermore, all four ILs presented a significant thermal stability below 250°C, further confirming their suitability for heat pump technology. Among these four working pairs, both [EMIM][MeSO 3 ]+H 2 O and [EMIM]Cl+H 2 O exhibited lower viscosities and specific heat capacities. However, it should be noted that [EMIM][MeSO 3 ]+H 2 O demonstrated a substantially higher corrosion rate (reaching up to 734.84 μm∙y −1 ), making [EMIM]Cl+H 2 O the preferable option for most absorption transformers. This study establishes an experimental basis for the feasibility of the application of ionic liquids in absorption heat transformer cycle and provides data to support the selection of cleaning working pairs.
研究领域:
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Suzhou Dai,Yonggao Yin,Yikai Wang,Xuanlin Liu,Maurizio Peruzzini,Francesco Barzagli
Chemical heat pump based on ammonium carbamate (AC) is a promising low-grade heat utilization technology. It is essential to know the chemical equilibrium properties in the application of AC-based technologies. AC is usually mixed with solvents to realize circulation. However, the existing studies mainly focus on AC in the solid phase. Therefore, the influence of solvents on the chemical equilibrium of AC was experimentally investigated in this work. The results confirm the solvent effect on the equilibrium pressure of AC in the range of 10∼90 °C. For solvents capable of dissolving AC, the equilibrium pressure increases with both AC concentration and temperature. The solvent effect is mainly due to the influence on both the reaction enthalpy and entropy change terms. An equilibrium pressure–temperature–concentration relationship of AC solution is established. These results provide essential parameters for the design and operation of low-grade heat management and utilization systems based on AC.
研究领域:
热力学
·
化学工程
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2025
·
IF 6.3
Yingzheng Yuan,Xi Man,Hao Lu,Ziye Ling
Sodium acetate trihydrate (SAT) is a promising phase change material for thermal energy storage, but its application is limited by its phase change temperature, subcooling, phase separation, and leakage. In this study, we successfully addressed these challenges by forming a binary eutectic with tetraethylammonium chloride (TEAC) and incorporating additives and a support material. The addition of 15 wt% TEAC reduced the phase change temperature to 49.2 °C while maintaining a high latent heat of 184.9 J/g. Further improvements were achieved by adding 1 wt% sodium tetraborate decahydrate (STD) as a nucleating agent to reduce subcooling and 1 wt% carboxymethyl cellulose (CMC) as a thickener to prevent phase separation. The issue of leakage was resolved by adsorbing the eutectic salt onto silicon dioxide (SiO 2 ), resulting in a shape-stable composite with minimal leakage. The optimized SAT-TEAC/SiO 2 composite phase change material demonstrated excellent thermal stability and retained its phase change properties even after 1000 thermal cycles. This new composite material shows great promise for thermal energy storage and solar heat pump systems due to its enhanced performance and stability.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Kaile Shi,Rui Wang,Honghai Wang,Chunli Li,Jiapeng Liu
1,4-Butanediol (BDO) is crucial for biodegradable plastics production and other specialty chemicals, making it essential for numerous industrial applications. However, the synthesis of BDO via the Reppe process introduces impurities such as ethylene glycol, 3-methyl-1,5-pentanediol, and 1,6-hexanediol, and developing efficient BDO purification processes is necessary. Vapor-liquid equilibrium experiments were performed to obtain thermodynamic data, which were then correlated to determine the binary interaction parameters of the thermodynamic models. Batch distillation experiments were further conducted to validate the vacuum distillation for BDO purification. The benchmark separation process involved direct and indirect distillation columns, followed by dividing wall column (DWC) and heat pump (HP) implementations. Evaluation results revealed that the heat pump-assisted indirect distillation sequence (IDS-HP) achieved a remarkable 52% reduction in total annual cost, and the thermodynamic efficiency improved from 9.9% to 45.2%. The heat pump-assisted DWC (DWC-HP) demonstrated the potential to achieve net-zero CO 2 emissions. This research provides both theoretical and experimental foundations for the purification of BDO.
研究领域:
化学工程
·
分离过程
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热力学
·
过程优化
·
可持续技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2025
·
IF 2.1
Yufan Yang,Muran He,Yichan Zhang,Chunting Zhou,Chunhuan Luo
The cis-1-chloro-3,3,3-trifluoropropene (R1233zd(Z)) and tetraethylene glycol dimethyl ether (TEGDME) system has been proposed in this study as a potential alternative absorption working pair. The vapor pressure, density, viscosity, and specific heat capacity of the R1233zd(Z)/TEGDME system were measured systematically. The mixing enthalpy and specific enthalpy were calculated by the NRTL model. Regression equations for the measured values were obtained by a least-squares method. Compared with the LiBr/H2O system, the generation temperature of the R1233zd(Z)/TEGDME system is reduced by 12 °C and the viscosity by about 50%. R1233zd(Z)/TEGDME has strong practical application significance in the absorption heat pump system.
研究领域:
化学工程
·
热力学
·
制冷技术
✓ 已验证
产品关联
DOI
高影响因子
Food Chemistry-X
·
2025
·
IF 8.2
Zhanxia Liu,Hongbin Wu,Yinglin Du,Xinwen Jin,Tarun Belwal,Hui Yang,Xizhe Fu
This study aimed to explore the impact of different harvest maturity stages (white, semi-ripe, and fully ripe) and various drying methods [freeze drying (FD), freeze drying followed by heat pump drying, and FD followed by far-infrared drying (FD-FID)] on the quality and aroma profile of gray jujube powder. The results demonstrated that both the harvest maturity stage and drying methods significantly ( P < 0.05) influenced the physical properties, chemical composition, and aroma profile of gray jujube powder. Notably, the combination of semi-ripe stage and FD-FID method effectively reduced browning while improving solubility, hygroscopicity, and antioxidant activity of the jujube powder, contributing to the overall enhancement of product quality. In addition, gas chromatography–mass spectrometry analysis of volatile compounds of gray jujube powder revealed differences in aroma profiles across maturity stages and drying methods. This study provides insights into how harvest timing and drying strategies can be synergistically optimized to improve the quality and aroma profile of gray jujube powder, offering a theoretical foundation and practical guidance for industrial processing.
研究领域:
食品科学
·
农业工程
·
采后技术
·
分析化学
·
风味化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Jingli Han,Yuanyuan Fan,Gangqiang Yu,Xuzhao Yang,Yingying Zhang,Junfeng Tian,Guoxuan Li
The ethanol (EtOH) dehydration process using ionic liquids (ILs) as entrainers by extractive distillation integrated with a heat pump was systematically investigated from the molecular level to the process scale. [BMIM][Cl] was selected as the appropriate entrainer from a variety of [Cl]−-based ILs by achieving vapor–liquid equilibrium (VLE) experiments for binary systems of EtOH–IL and water (H2O)–IL. The VLE behavior of a ternary EtOH–H2O–IL system demonstrates that the azeotropic phenomenon of the binary EtOH–H2O system is effectively broken in the presence of IL. Moreover, the UNIFAC model was successfully extended to predict the VLE of the EtOH–H2O–IL system. The microscopic mechanism of the EtOH–H2O separation with [BMIM][Cl] as an entrainer at the molecular level was identified by performing molecular dynamics simulations. It is found that hydrogen bond interactions of EtOH/H2O–[BMIM]+ and −[Cl]− play crucial roles in breaking the azeotropic phenomenon. The equilibrium stage model for the ethanol dehydration process with [BMIM][Cl] as an entrainer was established, wherein the binary group interaction parameters of the UNIFAC model were embedded. The process simulation and optimization were performed at the industrial scale. The extractive distillation process intensified with the heat pump technology has better economic and environmental efficiencies when compared with the conventional one. The total annual cost and CO2 emission of the former are reduced by 27.01 and 80.46%, respectively, compared with those of the latter. In short, the process intensification technology for ethanol dehydration by using ILs as entrainers integrated with the heat pump proposed in this work is in line with sustainable chemical separation processes, which can be directly extended to other extractive distillation processes with ILs.
研究领域:
化学工程
·
过程强化
·
分离科学
·
分子模拟
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Wei Li,Xiaoxiao Xia,Song Li
Exploring high-performing adsorption-driven heat pumps (AHPs) remains a challenging task owing to the low working capacity, high regeneration temperature, and low energy efficiency of conventional adsorbents. Quick discovery of the novel promising adsorbents could help to improve the coefficient of performance of AHPs for heating (COPH) and cooling (COPC). Herein, we reported an approach to identify the high-performing covalent–organic frameworks (COFs) for heating, cooling, and ice making by high-throughput computational screening based on grand canonical Monte Carlo simulations and, for the first time, machine learning. It was demonstrated that compared with metal–organic frameworks (MOFs), COFs were more suitable adsorbents of AHPs for cooling because of their weak interaction toward ethanol that favors stepwise adsorption. Structure–property relationship analysis revealed that the average enthalpy of adsorption commensurate with the enthalpy of evaporation will benefit the performance of AHPs besides the high working capacity and low step positions of adsorption isotherms. In order to reduce the computational cost of screening, a random forest model was developed to successfully predict the COPC of both COFs and MOFs.
研究领域:
材料科学
·
热能工程
·
计算化学
·
机器学习
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Shi Li,Xiahong He,Xuechun Zhang,Kin Weng Kong,Jianhua Xie,Jian Sun,Zhenxing Wang
Gastrodia elata Blume ( G. elata ) is a traditional medicinal and edible plant whose quality is significantly influenced by post-harvest processing. To obtain an optimal post-harvest processing method for G. elata , this study employed sensory evaluation, scanning electron microscopy (SEM), gas chromatography-ion mobility spectrometry (GC-IMS), and non-targeted metabolomics, in conjunction with an in vitro digestion model, to assess the impact of different processing and drying methods on the quality of G. elata . The findings showed that the steam treatment followed by heat pump drying resulted in the highest levels of total phenols, total flavonoids, and polysaccharides in G. elata , and caused more pronounced damage to its microstructure. This treatment also maintained the highest antioxidant activities and optimal acetylcholinesterase (AChE) inhibition capacity throughout in vitro digestion, meanwhile, effectively eliminating the unpleasant odor and achieving the highest sensory scores. Furthermore, non-targeted metabolomic analysis revealed noteworthy alterations in the metabolite profile of G. elata , mainly related to purine metabolism and the biosynthesis of amino acids pathways. This study provides valuable insights into the post-harvest processing of G. elata .
研究领域:
药理学
·
食品科学
·
植物科学
·
代谢组学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）