STAR Protocols
·
2023
·
IF 0
Zhipeng Luo,Jiayun Wang,Yu Pan,Peng Gao,Hua Zhang,Ruzhu Wang
Summary Desiccant-coated heat exchangers provide a practical solution for the efficient removal of moisture from the air. Here, we present a protocol to synthesize an ultra-hygroscopic polymer to develop a LiCl loaded in curdlan hydrogel (LiCl@Cur)-coated heat exchanger for deep dehumidification. We describe steps for preparing the curdlan gel solution, hydrogel, LiCl solution, and LiCl@Cur. We then detail procedures for preparing curdlan-coated and LiCl@Cur-coated heat exchangers. The coated heat exchanger described in this protocol has a maximum dehumidification capacity of 12 g/kg. For complete details on the use and execution of this protocol, please refer to Pan et al. (2023). 1
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
PubMed
Micromachines
·
2023
·Vol. 14
·期 3
·704
·
IF 3.4
Wenbo Su,Xiangyou Lu,Yunxiang Shu,Xianshuang Liu,Wen Gao,Jianjie Yao,Zhuang Niu,Yuanlai Xie
The self-cleaning ability of superhydrophobic metal surfaces has attracted extensive attention. The preparation of superhydrophobic material using the coating method is a common processing method. In this experiment, aluminum fins were processed by laser etching and perfluorinated two-step coating. The aluminum surface was modified using a femtosecond laser and 1H,1H,2H,2H- perfluorooctane triethoxysilane (PFOTES). A superhydrophobic aluminum surface with excellent mechanical stability and self-cleaning properties was obtained with the superhydrophobic contact angle (WCA) of 152.8° and the rolling angle (SA) of 0.6°. The results show that the superhydrophobic surface has an excellent cleaning effect compared with an ordinary surface in unit time. Then, a wear resistance test of the superhydrophobic surface was carried out by using the physical wear method. The results show that physical wear had a low influence on the hydrophobic property of the specimen surface. Finally, the Vickers hardness analysis found that the superhydrophobic surface hardness was significantly better than the ordinary surface hardness compared with the superhydrophobic surface hardness. Based on the excellent self-cleaning properties, wear resistance, and robustness of superhydrophobic materials, the laser-etched and perfluorinated superhydrophobic aluminum fins designed and manufactured in this study have broad application prospects in improving the heat transfer efficiency of finned heat exchangers.Keywords:self-cleaning;aluminum;femtosecond laser;durability;finned heat exchanger;superhydrophobicity
研究领域:
材料科学
·
表面工程
·
传热学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Liuyan Yin,Xingui Zhou,Jinshan Yu,Honglei Wang
Ceramic foam with excellent mechanical performance, high thermal conductivity and high surface area-to-volume ratio is thought to have great potential in heat exchanger application. In this study, silicon nitride (Si 3 N 4 ) foams with ultrathin cell walls were prepared by using a protein foaming method via increasing the air fraction of foamed slurry. Cell thickness of these Si 3 N 4 foams was only 2–3 µm and the pores in the Si 3 N 4 foams fabricated here exhibited polyhedral shapes. Thermal conductivities of these Si 3 N 4 foams ranged from 2.427 W m −1 K −1 to 3.154 W m −1 K −1 , whereas compressive strengths of these Si 3 N 4 foams are in the range from 12.85 MPa to 19.99 MPa. Moreover, compressive load–displacement curves of the Si 3 N 4 foams generally exhibit cellular behavior.
研究领域:
材料科学
·
工程热物理
✓ 已验证
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2024
·Vol. 26
·期 22
·2401581
·
IF 3.4
Li Wan,Jinyin Wang,Wen Yue,Fankai Lin,Chuanhua Gao,XianJie Liu,Xin Min,Chengbiao Wang,ZhaoHui Huang
Geothermal energy, derived from the radioactive decay of elements within the Earth's core, is a renewable and clean energy source. The extraction of geothermal energy primarily depends on ground heat exchangers. To address the issue of incompatibility between corrosion resistance, high thermal conductivity, and mechanical performance in current ground heat exchangers, this study develops composites (PEPOE/SCA@SiC) composed of high-density polyethylene (HDPE) modified with toughener polyethylene-octene copolymer elastomer (POE) and silicon carbide (SiC) crystals modified with γ-aminopropyltriethoxysilane (SCA). HDPE offers excellent corrosion resistance, SiC crystals provide efficient phonon transport, and SCA improves the interface compatibility of the composite. The thermal conductivity of PEPOE/SCA@SiC reaches 3.83 W m − 1 K − 1 , with a maximum tensile strength of 20.3 MPa, a tensile elastic modulus of up to 498 MPa, and a maximum bending stress of 22.2 MPa with a bending elastic modulus of 561 MPa. Corrosion resistance tests indicate no signs of corrosion in PEPOE/SCA@SiC when exposed to geothermal simulation fluids at 90 °C for 30 days. This study demonstrates that PEPOE/SCA@SiC composites have substantial potential for application in ground heat exchangers, offering promising prospects for advancing sustainable use of geothermal energy and environmental protection.
研究领域:
材料科学
·
可再生能源
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED THERMAL ENGINEERING
·
2025
·
IF 6.9
Tingting Luo,Peng Pei,Shixun Hu,Chen Wang,Long Tang
Phase change materials (PCMs) are regarded as an effective backfill material with thermal regulation capability for borehole based shallow geothermal systems. However, the proportion of PCMs needs to be customized according to the thermal stability design of underground systems, which remains challenging. In this study, microencapsulated PCMs (MPCM) were synthesized via the sol–gel method using capric acid and lauric acid in a molar ratio of 13:7. The MPCM exhibited a phase change temperature of 19.39 °C, a latent heat of 141.2 J/g, and a microcapsule coating rate of 71.45 %. The MPCM was incorporated into backfill material to form a composite (MPCM sands) for borehole heat exchangers (BHEs). Its properties were characterized by DSC, multi-channel temperature tests, and 1 HNMR. Experimental results indicated that the composite with 10 wt% MPCM showed the smallest temperature variation under the same heat absorption. A numerical model of a single borehole under intermittent cooling operation was established, revealing that the 10 % MPCM sands composite exhibited superior overall thermal performance. Both experimental and simulation results suggest that the design of PCM-based backfill should comprehensively consider thermal conductivity, phase change temperature, phase change rate, and volume constraints to determine the optimal PCM proportion. The optimal 10 wt% MPCM composite thus achieved a coefficient of performance (COP) of 5.38 and a heat exchange rate of 98.44 W/m, effectively minimizing the potential for underground instability associated with material leakage.
✓ 已验证
产品关联
DOI
高影响因子
ENERGY CONVERSION AND MANAGEMENT
·
2025
·
IF 10.9
Xinyu Zhou,Yaohui Feng,Lurong Ge,Zixuan Su,Tianshu Ge
Desiccant coated heat exchanger (DCHE) is a promising and energy-efficient dehumidification unit, which uses cooling source to overcome sorption heat effect. Recently, metal–organic framework (MOF) is emerging in this filed due to its S-shaped isotherms, leading to reduced requirements for regeneration temperature differences. However, this unique characteristic of MOF also means that each adsorbent can only function under conditions where the relative humidity (RH) is limited, and adsorbents with high stepwise relative humidity are difficult to function under low humidity conditions. This work proposes a two-stage MOF-coated heat exchanger (MCHE), where the first stage utilizes MOFs that operate under high RH, while the second stage employs adsorbents capable of functioning at low RH, aiming to achieve efficient cascade dehumidification over a wide humidity range. MIL-101(Cr) and Al-fumarate were respectively selected for the first and second stages for experimental verification. The influence mechanisms of key parameters such as switching period, cooling/hot water temperatures, and air conditions were investigated. Compared with the single stage configuration, the two-stage MCHE in this work exhibits better heat and mass transfer performance, achieving a lower supply air temperature (2–3 °C lower) and a higher dehumidification efficiency (10 % higher). This study verifies the feasibility and applicability of the proposed system, providing a new approach for efficient dehumidification under wide humidity range.
研究领域:
化学工程
·
能源科学
·
环境工程
·
材料科学
·
热力学
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传热传质
·
功能材料
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2023
·
IF 5.4
Yunxiang Shu,Xiangyou Lu,Wansu Lu,Wenbo Su,Yingqing Wu,Honghong Wei,Dong Xu,Jie Liang,Yuanlai Xie
This paper uses a new method combining nanosecond laser processing technology and sol-gel to design and manufacture mechanically robust micro-nano structure and modified SiO 2 @PDMS coating on copper substrate. The superhydrophobic composite surface was successfully synthesized with a water contact angle of 159.5° and a sliding angle of 0.5°. The characterization of the prepared superhydrophobic surface #3 (laser-textured@SiO 2 @PDMS protective layer) was studied by optical profilometry, scanning electron microscopy, FT-IR spectroscopy, and X-ray photoelectron spectroscopy. The composite structure of micron/nano and organic/inorganic 3D interwoven network can be observed to improve the hydrophobic, wear-resistant, and compressive properties of the substrate surface. FT-IR spectra fully indicate the presence of PDMS and Si (CH 3 ) grafted onto SiO 2 particles on the copper surface, and the presence of Si O and Si C detected by XPS fully proves the FT-IR results. In addition, self-cleaning, wear resistance, anti-icing, corrosion resistance , and NaCl deliquescence behavior were evaluated. The results show that surface #3 can efficiently remove contaminants within 200 s. In the anti-icing experiment, the delayed icing time and ice adhesion strength of surface #3 are 3.33 times and 1.99 % of that of the ordinary copper surface, respectively, which can make the icicle slide easily. In the electrochemical test, the corrosion current density decreased by an order of magnitude, and the corrosion inhibition efficiency reached 90.57 %. Based on its excellent self-cleaning, mechanical robustness, anti-icing, and anti-corrosion properties, we believe that the composite modified surface of the laser-textured@SiO 2 @PDMS protective layer designed and manufactured in this study is expected to be used in engineering fields such as refrigeration heat exchangers .
研究领域:
材料科学
·
表面工程
·
腐蚀科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2022
·
IF 8.907
Sebastiano Tomassetti,Alessia Aquilanti,Pio Francesco Muciaccia,Gianluca Coccia,Christoph Mankel,Eduardus A.B. Koenders,Giovanni Di Nicola
The increasing use of renewable energy sources has highlighted the importance of energy storages, and in particular of latent heat thermal energy storages (LHTESs). Among the phase change materials (PCMs) that can be used in such systems, sugar alcohols (SAs) are considered potential substances that may lead to interesting applications in the LHTES sector. In this work, a detailed literature review analysis of six SAs (xylitol, sorbitol, erythritol, mannitol, inositol, dulcitol), their thermophysical properties, their thermal stability and their main LHTES applications is presented for the first time. The thermophysical properties under discussion include melting and crystallization temperatures , latent heats of melting and crystallization, specific heat, thermal conductivity , density and dynamic viscosity . Thermal stability was evaluated by taking into account studies of thermal endurance, degradation temperature and cycling stability. Differential scanning calorimetry (DSC), T -history, Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA) were considered as measurement techniques. Applications include the use of SAs in solar collectors and cookers, heat exchangers , porous materials, absorption cooling systems, mobilized thermal energy storages (M-TESs). New measurements of phase transition properties and degradation temperature for the studied SAs were also carried out by the authors of the present study. A good agreement between the proposed data and the literature values was found. The analysis reveals that some SAs may be considered suitable for low-to-medium temperature LHTES applications, provided that their drawbacks are adequately evaluated and addressed. To this purpose, the study also highlights the most critical aspects that should be considered when developing both fundamental research and engineering applications related to SAs.
研究领域:
能量存储
·
热能工程
·
材料科学
·
可再生能源
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）