Article
Chemistry, Inorganic & Nuclear
K. W. Wang, Ting Yan, L. C. Meng, W. G. Pan
Summary: The development of composite phase change materials (CPCMs) has the potential to enhance thermal conductivity and prevent leakage, thus improving the heat storage performance and contributing to efficient energy use and sustainable development.
DALTON TRANSACTIONS
(2023)
Article
Energy & Fuels
Zeyang Kang, Sihan Huang, Xiangyang Liu, Ying Zhang, Maogang He
Summary: Suitable eutectic point, high specific heat capacity, large latent heat, low cost and other factors were considered to design a new type of molten salt in this work, and composite phase change materials (CPCM) were prepared for the utilization of solar energy by thermal energy storage. The designed molten salt is NaF-Na2CO3-Na2SO4 eutectic salt with high liquidus specific heat capacity and latent heat, and expanded graphite and graphene nanoplatelets were used to improve its structural stability and thermal conductivity. The addition of these nanomaterials greatly enhanced the thermal conductivity of the composites. The prepared molten salt and composites have a promising application prospect in high-temperature energy storage.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Energy & Fuels
Yingjie Huo, Ting Yan, Xiaole Chang, Weiguo Pan
Summary: In this study, a CuS with a flower ball shape was synthesized and loaded onto cotton yarn to develop a photosensitive interfacial material with excellent photothermal conversion properties. Four sandwich-shaped photothermal composite phase change materials (CPCMs) were prepared using different ratios of expanded graphite (EG) and 1-octadecanol (OC). The developed CPCMs exhibited good thermal storage performance, photothermal conversion efficiency, and thermal stability, showing potential for solar thermal storage applications.
Article
Thermodynamics
Xiaoxue Luo, Shibo Cao, Jin Hu, Changzhen Zou, Xiaochun Han, Haotong Jing, Yu Fang
Summary: This study investigates the effect of density and size of expanded graphite (EG) on phase change materials (PCM). It is found that EG with a density of 200 kg m-2 and a size of 50 mesh has better adsorption ability for PCM and can be used to prepare shape-stabilized PCM with higher latent heat value and lower undercooling.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Energy & Fuels
Xiaoling Tan, Hongen Nian, Jinhong Li, Yongquan Zhou, Fayan Zhu, Xiang Li
Summary: The addition of lotus root starch can significantly enhance the melting enthalpy of composite phase change materials, facilitate the formation of hydrogen bonds, improve water retention capacity and thermal properties, presenting promising applications in heat storage.
Article
Energy & Fuels
Xiaofeng Ran, Haoran Wang, Yajuan Zhong, Feng Zhang, Jun Lin, Hua Zou, Zhimin Dai, Baolin An
Summary: Eutectic chloride salts in combination with ?-alumina and expanded graphite have been successfully developed as composite phase change materials with good thermal properties and chemical compatibility. Thermal cycling tests at high temperatures demonstrated enhanced thermal performance of the composite PCMs, with significant improvement in thermal conductivity due to the addition of EG.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2021)
Article
Green & Sustainable Science & Technology
Niangzhi Lin, Chuanchang Li, Dongyao Zhang, Yaxi Li, Jian Chen
Summary: The tailored phase change cold storage material SBCKN, composed of SSD, B, CMC, KCl, and NH4Cl, successfully suppressed supercooling and phase separation, with a melting phase change temperature of 8.01 degrees C. Addition of EG improved shape stability and thermal conduction properties, resulting in SBCKN/EG(5) with a lower melting phase change temperature, higher latent heat of melt values, and increased thermal conductivity. The composites demonstrated good chemical stability and potential application in cold chain transportation, with the mechanism of phase transition process further investigated.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
Article
Green & Sustainable Science & Technology
Pushpendra Kumar Singh Rathore, Shailendra Kumar Shukla
Summary: This study investigated the combined effect of loading Expanded Graphite and Expanded Vermiculite on the low-cost PCM, and explored the performance of ss-CPCM. The experiment found that adding 7% EG can increase the thermal conductivity of ss-CPCM, significantly improve its heating and cooling rates, and demonstrate good thermal stability and the ability to regulate indoor temperature.
Article
Energy & Fuels
Shubhma Dilip Saraf, Debabrata Panda, Krunal M. Gangawane
Summary: This experimental study introduces a composite phase change material (HNIPCM) with hybrid nanomaterials to resolve the disadvantages of pure phase change materials, and demonstrates its practical feasibility in solar water heater performance. By using expanded graphite and nickel ferrite nanoparticles as filler materials, the composite phase change material exhibits enhanced thermophysical properties. The results show that the composite material performs well in a solar water heater under specific conditions, such as a 45-degree inclination angle and a flow rate of 2.2 LPM.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Green & Sustainable Science & Technology
Ali Yousefi, Waiching Tang, Mehrnoush Khavarian, Cheng Fang
Summary: In this study, recycled expanded glass aggregate (EGA) was used as a PCM carrier to fabricate form-stable PCM composite, showing high absorption ratio and stability. Thermal performance measurements demonstrated that using EGA-PCM composite can significantly reduce the heat transfer rate of the cement mortar up to 47%.
Article
Chemistry, Physical
Zanshe Wang, Guoqiang Huang, Zhaoying Jia, Qi Gao, Yanping Li, Zhaolin Gu
Summary: This study developed a composite eutectic fatty acid system based on phase change materials, which can improve heat recovery. The experimental results showed that the composite PCMs with an appropriate amount of expanded graphite had stable phase transition temperature and latent heat, and higher thermal conductivity and thermal diffusion coefficient. In the prepared heat reservoir, the best heat storage and heat release performance were achieved when the ratio of expanded graphite was 10%.
Article
Chemistry, Physical
Erin Blackley, Trinny Lai, Adewale Odukomaiya, Paulo Cesar Tabares-Velasco, Lance M. Wheeler, Jason Woods
Summary: This study presents a new PCM composite consisting of calcium chloride hexahydrate, strontium chloride hexahydrate, and surface-modified expanded graphite. By using a nonionic surfactant, the concerns related to salt hydrates are addressed, while excellent cycling stability is achieved on a larger scale.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Energy & Fuels
Loka Prakash Vandana, Ravi Ramadoss
Summary: This study synthesized modified graphite through the ultrasonic dispersion method in brewed wine solution with myristic acid to create a conduction of heat mechanism with a greater affinity for saturated fats. The resulting graphite made a fatty acid hybrid phase change material with excellent overall thermal behavior. Various analysis techniques showed the physical adsorption synthesis rather than a chemical reaction, and the addition of graphite enhanced the heat capacity of the material after multiple heat storage and release cycles. The study also evaluated the thermal stability of the material and demonstrated the uniform distribution of graphite around the myristic acid's multi-pore structure.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Energy & Fuels
Qingqing Wang, Dan Zhou, Yuming Chen, Zhigen Wu
Summary: This study investigated the corrosion behavior of stainless steel 316 in a ternary nitrate salt mixture, revealing that temperature is the main factor affecting the average corrosion rate. Additionally, the addition of 10 wt% EG at 300 degrees Celsius significantly reduced the corrosion rate and thickness of the corrosion layer.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2021)
Article
Energy & Fuels
Tieying Wang, Kaichen Wang, Feng Ye, Yunxiu Ren, Chao Xu
Summary: The addition of expanded graphite led to changes in the morphology and pores of the composite, increasing surface area and pore size. Despite slight decreases in specific heat capacity and latent heat, the thermal conductivity of the composite increased with expanded graphite content. The composite with 6 wt.% expanded graphite exhibited excellent thermal storage property and thermal conductivity.
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)
