Article
Thermodynamics
Xiangshan Gai, Jingge Song, Lixin Wang, Boshu He
Summary: This study investigates a heat pipe-assisted finned adsorber unit tube (AUT) for a vehicle adsorption cooling system (ACS). A numerical model combined with experimentally validated heat pipe model and adsorption isotherm model is developed to analyze the adsorption/desorption characteristics of the system. Specific cooling power (SCP), coefficient of performance (COP), and adsorber bed to adsorbent mass ratio (AAMR) are quantified to evaluate the cooling capacity and system performance. The results show that the heat pipe significantly improves the SCP and COP of the adsorber. Smaller adsorbent particle size and larger cyclic water uptake lead to better system performance. The heat pipe-assisted finned adsorber offers a viable solution for onboard ACS.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Stefano Brandani, Enzo Mangano, Giulio Santori
Summary: This study measured the adsorption equilibrium data of Water/AQSOA-FAM-Z02 using two gravimetric systems under different temperatures and humidity levels. It was found that the data conformed to the IV type adsorption isotherm. The Rigid Adsorbent Lattice Fluid dual site model used in the study was able to reproduce the experimental results and showed an open hysteresis at 1% RH. The improved model, which considered the non-desorbing fraction of pores, successfully reproduced the experimental desorption curves. The obtained isosteric heats of adsorption exhibited a complex concentration dependence.
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2022)
Article
Environmental Sciences
Rameez Ahmad Aftab, Sadaf Zaidi, Mohd Danish, Sayed Mohammad Adnan, Khursheed B. Ansari, Mohammad Danish
Summary: This study applied support vector regression (SVR) to predict phenol adsorption on activated carbon in RPB, finding that the SVR model and ANN model had similar predictive performance, with the ANN model slightly outperforming the SVR model. In the test dataset, the coefficient of determination (R-2) and root mean square error (RMSE) values for the MR RPB adsorption model were 0.934 and 0.149, while for the SVR and ANN-based models, these values were 0.996 and 0.045, and 0.998 and 0.027, respectively.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Thermodynamics
Dong-min Kim, Joong Kim, Jungchul Lee, Bong Jae Lee
Summary: The effective thermal conductivity of LaNi5 powder packed bed was analyzed using a miniaturized guarded hot-plate apparatus in this study. Calibration experiment and uncertainty analysis were conducted to validate the accuracy of the apparatus. The study estimated the effect of particle size on the contact factor of the packed bed and analyzed the impact of contact factor and gas thermal conductivity on the characteristic length of the gas film using the Yagi and Kunii model.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
H. Wang, Z. G. Qu, Y. Yin, J. Q. Bai, C. He
Summary: A predictive model for effective thermal conductivity of an adsorption bed was developed, considering the impact of the adsorbed phase on gas phase thermal conductivity. The study revealed three distinct regions in the thermal conductivities of the zeolite adsorbent particles and bed, with identified inflection point temperatures. The model showed that gas adsorption effects can be ignored above certain inflection point temperatures, and ignoring the coupled effect of adsorption phase and gas phase can lead to overestimation of the ETC.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Environmental Sciences
Mohd Danish, Khursheed B. Ansari, Mohammad Danish
Summary: In this study, models were used to analyze the adsorption of Pb(II) from an aqueous solution using a nanostructured gamma-alumina adsorbent in a packed bed adsorber. The simulation results successfully predicted various parameters of the adsorption process and were validated using statistical measures.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Jose M. Obon, Jose A. Fernandez-Lopez, Mercedes Alacid, Jose M. Angosto
Summary: This study compared the performance of a spinning submerged filter adsorber and a fixed bed adsorber in continuous antibiotic removal. It was found that the fixed bed adsorber packed with coarse powder activated carbon was the most efficient adsorber for treating wastewater spiked with high concentrations of antibiotics. The spinning submerged filter adsorber using a lower concentration of powder activated carbon also achieved high removal effectiveness. This adsorption unit can be adapted to the effluent micropollutant concentrations, making it a promising alternative for adsorption processes.
Article
Construction & Building Technology
Dongsheng Li, Congliang Huang
Summary: A novel porous carbon material was developed from pressed and carbonized pine sawdust, showing excellent thermal insulation performance and environmental friendliness. The carbonized pine sawdust packed (CPP) bed exhibited low thermal conductivity, high porosity, hydrophobicity, reusability, and structural stability.
ENERGY AND BUILDINGS
(2022)
Article
Energy & Fuels
David Gavino, Eduardo Cortes, Jesus Garcia, Ignacio Calderon-Vasquez, Jose Cardemil, Danilo Estay, Rodrigo Barraza
Summary: A discrete 1-D Eulerian and 3-D Lagrangian model is proposed to analyze heat transfer in packed beds composed of spherical particles. The model simulates particle behavior and provides detailed information about heat transfer. Comparison with experimental data indicates good accuracy. A sensitivity analysis demonstrates the importance of selecting an appropriate Nusselt number.
Review
Green & Sustainable Science & Technology
Ignacio Calderon-Vasquez, Eduardo Cortes, Jesus Garcia, Valentina Segovia, Alejandro Caroca, Cristobal Sarmiento, Rodrigo Barraza, Jose M. Cardemil
Summary: Single-tank packed-bed storage system, coupled with renewable thermal energy sources, has been established as a promising alternative with a potential cost reduction of approximately 33% compared to two-tank systems. The performance of simulation models in packed-bed energy storage systems is significantly influenced by radiation heat transfer among particles, which should not be underestimated when analyzing operation temperatures above 750 degrees C.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Review
Green & Sustainable Science & Technology
Shuangjun Li, Xiangzhou Yuan, Shuai Deng, Li Zhao, Ki Bong Lee
Summary: CO2 adsorption capture technology using biomass-derived materials is considered a cost-effective and environmentally friendly method for mitigating climate change. From a thermodynamic perspective, this method is preferred and feasible for commercial-scale applications.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Thermodynamics
Ziya Zeng, Bingchen Zhao, Weidong Chen, Kian Jon Ernest Chua, Ruzhu Wang
Summary: Water-based adsorption thermal battery (ATB) has great potential in widespread applications, especially in space heating, for energy saving and low-grade heat energy utilization. Experimental results show that the output temperature and heating power can be stabilized by tuning the airflow rate in the loop-cycle ATB system. A computational model predicts an effective heating time of 8.6 h, a discharging threshold temperature of 24 degrees C, and a maximum heat discharging efficiency of 63.4% for the packed-bed ATB. The ATB is capable of achieving stable thermal outputs for space heating applications.
Article
Thermodynamics
Christian Odenthal, Jonas Tombrink, Freerk Klasing, Thomas Bauer
Summary: Various models for packed bed single tank molten salt storage systems have been compared, considering different use cases and considering the impact of heat losses and variable fluid properties. The results show that the choice of model significantly affects the outcome, and the results vary for different use cases. Therefore, selecting a reasonable level of modelling detail based on desired accuracy and computational effort is important.
APPLIED THERMAL ENGINEERING
(2023)
Article
Engineering, Chemical
Masoumeh Baghelani, Hossein Kazemian, Behrouz Bayati, Ehsan Noorollahi
Summary: The research investigates the adsorption behavior of methane, ethane, water, methyl mercaptan, and carbonyl sulfide on LTA zeolite for natural gas dehydration units. The study models the data using the Langmuir and Sips models, with the Sips model showing better agreement with simulation results. Increasing temperature decreases adsorption, while increasing pressure has an incremental effect on adsorption.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Energy & Fuels
Mohammad M. S. Al-Azawii, Sabah F. H. Alhamdi, Sasha Braun, Jean-Francois Hoffmann, Nicolas Calvet, Ryan Anderson
Summary: This paper presents experimental results comparing a new 100% recycled ceramic material, ReThink Seramic - Flora, with conventional alpha-alumina materials in thermal energy storage. The study shows that alumina beads have higher performance in terms of thermal exergy efficiency than ReThink Seramic - Flora.
JOURNAL OF ENERGY STORAGE
(2021)
Review
Thermodynamics
Shuling Guo, Ankuo Zhang
Summary: Low-temperature biopreservation is commonly used for medication storage to prolong their shelf life. However, cryo-injury can occur during cryopreservation, making it crucial to find a way to achieve long-term biopreservation without causing harm. The optimal storage temperature for different biomaterials should be investigated to improve storage efficiency. This review discusses the mechanisms of cryo-injury and biopreservation, as well as the reasons for storing biological tissues at various temperature zones. It provides valuable insights for the development of biostorage technology.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)
Article
Thermodynamics
M. Mohsin Tanveer, Craig R. Bradshaw, Joe Orosz, Greg Kemp
Summary: This study investigates the optimal geometric parameters for a spool compressor using simulation models, and the results indicate that a eccentricity ratio of 0.75 and L/D ratios between 1-1.5 can maximize the volumetric and isentropic efficiencies.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)
Article
Thermodynamics
Kongkuai Ying, Zhenhua Jiang, Wenting Wu, Jinjian Chu, Shaoshuai Liu, Yinong Wu
Summary: The Stirling/pulse tube cryocooler (SPC) is a highly efficient and long-lasting cryocooler for space applications. It has the ability to adjust the inter-stage refrigeration capacity dynamically by controlling the Stirling displacer in the first stage. This paper proposes an SPC with a second-stage active phase shifter (APS) that can control the phase difference at the second-stage hot end in real time. The experimental results show that the SPC with the APS can provide refrigeration capacity at different temperatures, with a minimum temperature of 13.5K.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)
Article
Thermodynamics
Ligeng Li, Hua Tian, Kai Liu, Yibo Wu, Xuan Wang, Xingyu Liang, Gequn Shu
Summary: This study focuses on improving the performance of carbon dioxide refrigeration systems by introducing a multi-ejector design with three controllable ejectors. Experimental analysis shows that the system's performance can be significantly improved by adopting an optimum pressure control strategy under different operating conditions.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)
Article
Thermodynamics
Joseph Al Khoury, Rabih Al Haddad, Ghiwa Shakrina, Christelle Bou Malham, Haytham Sayah, Chakib Bouallou, Maroun Nemer
Summary: This study investigates two implementation methods for calculating refrigerant thermodynamic properties and compares their performance. The results show that the implicit fitting method significantly speeds up simulation time and offers greater flexibility for modeling complex energy systems.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)
Article
Thermodynamics
Mariella Mateo-Villanueva, Rodolfo Echarri
Summary: This article details three models of different complexity levels for predicting the cold production of a solar cooling device and compares their advantages and disadvantages. The results show that the transient model underestimates the cold generation, while the equilibrium model and universal model overestimate it. The transient model is a useful tool for analyzing the impact of different variables in a solar adsorption refrigeration system, while the simpler models can be used for preliminary design and feasibility studies.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)
Article
Thermodynamics
Amin M. Elsafi, Majid Bahrami
Summary: The novel spherical micro-absorbers offer high sorption capacity and surface-to-volume ratios, solving issues such as solution carryover and corrosion associated with conventional absorbers.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)