CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2023
·
IF 3.9
Jiguang Huang,Haiping Chen,Jihao Yang,Ziwei Du,Heng Zhang,Zhaohao Li
Transport membrane condenser can efficiently recover water and heat from wet flue gas . Ceramic membrane is the heat and mass transfer medium in the process. However, the relationship between membrane property and the recovery performance is only partially reported based on current research state. This work focuses on the effects of permeability, material, and ceramic particle size of membrane on the water and heat recovery. Membranes were prepared from three different sizes of coal fly ash and an alumina powder. Water and heat recovery performances of the membranes are experimentally compared. Results indicate that increasing membrane permeability improves water and heat recovery because the resistance of heat and mass transfer is reduced. The alumina membrane performs 3–10% more water recovery than the coal fly ash-based membrane while thermal conductivity of the alumina membrane was 11.5 times that of the coal fly ash-based membrane. Increasing ceramic particle size shows two opposite effects on the water and heat recovery, promotion because of the permeability rising, and undermine because of the thermal conductivity reduction. Low-cost membranes with high permeability and high thermal conductivity are recommended in transport membrane condenser application.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Jiguang Huang,Heng Zhang,Yuntao Zhang,Dehua Liang,Haiping Chen
Water recovery from flue gas with transport membrane condenser (TMC) has gained much attention in recent years. It has great potential in water conservation and air pollution control. However, effects of porosity and pore size variation of macroporous membranes on TMC application have not been revealed. Coal fly ash (CFA) is used as main raw material to prepare various tubular macroporous ceramic membranes for TMC application. The extrusion method is adopted. Characterization of membranes are conducted for structural parameters evaluation. Prepared membranes were used for TMC application to experimentally study the water and heat recovery performance. Influences of temperatures and flowrates of flue gas and cooling water on recovery performance have been investigated. Increasing cooling water flowrate and flue gas temperature, as well as decreasing cooling water temperature can promote water and heat recovery performance of TMC. The highest water recovery efficiency is 79.21%. Although membrane pore size increasing improves water and recovery, the average pore size should be less than 2 μm to avoid transmembrane gas permeation. Results indicate that CFA membrane is suitable for TMC application and provides investment reduction.
研究领域:
环境科学
·
材料科学
·
化学工程
·
能源工程
·
膜科学与技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Huangying Wu,Guopeng Chen,Shangzhen Xie,Kang Xiang,Yipeng Fan,Zhiguang Guo
With the ever-fast development of devices and their high requirements, such as the increased working speed of computers, high energy density of batteries, and high energy transfer efficiency of solar photovoltaic panels, excessive heat is generated, which may lead to performance degradation, system crashes, or even damage. Therefore, effective thermal management systems are needed to control the temperature of the device and avoid energy waste. This study proposes an integrated thermal management system, which contains a hygroscopic hydrogel and a thermoelectric generator (TEG). The hygroscopic hydrogel regenerates by adsorbing water molecules from the atmosphere after losing water, making it reusable and long-lasting without the need for replacement. When a TEG is combined with a 5-mm-thick hydrogel as the thermal management structure, it is able to reduce the surface temperature of the heat source by 32 °C and convert the waste heat to electricity with a 0.20 V output under a 3-W input power for the heat source. Based on this excellent performance, this novel integrated thermal management structure provides a new perspective for future thermal management strategies, particularly for the effective thermal management of heating devices such as solar panels, energy storage batteries, and large electrical equipment.
研究领域:
材料科学
·
能源工程
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Qiang Jiang,Yu Shi,Yichao An,Liang Zhang,Jun Li,Xun Zhu,Qiang Liao
The all-aqueous thermally regenerative battery has the advantages of high open-circuit voltage, high power density, and high Coulombic efficiency, providing a promising way for low-temperature waste heat recovery. In this study, a passive membraneless thermally regenerative flow battery driven by capillary force and gravity is proposed to reduce the cost of construction and operation. The feasibility of power generation and the influence of key parameters (height difference, support electrolyte concentration, etc.) on the battery performance are studied. The results showed that a laminar flow induced by a fiber-based microfluidic reactor could effectively separate the catholytes and anolytes, and the battery could achieve long-term power production and obtain a maximum power density of 15.2 mW cm–2. The performance of the battery first increased and then decreased with the inlet height, and the optimal height was 3 mm. This is mainly due to the fact that the inlet height affects the flow rate of the electrolyte, which affects the mass transfer and laminar flow effect in the porous electrode. Within a certain range, as the concentration of the supporting electrolyte increases, the conductivity of the electrolyte is significantly improved, although the flow rate decreases to a certain extent due to the increase in viscosity, resulting in a further improvement in the battery performance. Through the above optimization, the maximum power density of the battery obtained in this study is 24.9 mW cm–2, and the maximum theoretical thermal efficiency can reach 1.26% (the relative Carnot efficiency can reach 10.6%).
研究领域:
能源科学
·
环境工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED THERMAL ENGINEERING
·
2021
·
IF 5.295
Kai-Qi Zhong,Yang Xiao,Xing Lu,Jun Deng,Lan Yin,Yuan Tian,Chi-Min Shu
The current prevention and control countermeasures for underground coal fire principally rely on various cooling and inhibiting methods. However, because tremendous thermal energy is locked in underground coalfield fires, thermal energy extraction and utilisation is a sustainable and environmentally friendly approach. In this study, a waste heat recovery system based on a two-phase closed thermosyphon-assisted thermoelectric generator technique was established for exploiting the thermal reservoir in underground coalfield fires. To enhance thermal extraction, nanofluid working fluid was used. The optimal concentration of the copper oxide (CuO) nanoparticle in the two-phase closed thermosyphons at three heat source temperatures (100, 200, and 300 °C) was found to be 5.0, 5.0, and 10.0 mass%, respectively. Proper addition of CuO enhanced the thermal transfer in the two-phase closed thermosyphon by 27.90%. Furthermore, the increase in the heat source temperature was positively related to the thermal extraction effect of the two-phase closed thermosyphon. With an optimised two-phase closed thermosyphon, the thermoelectric generator system, combined with forced air cooling, provided an output power of 0.1432–3.1360 W with a thermoelectric conversion efficiency of 0.54%–1.83% for heat sources ranging from 100 to 300 °C.
研究领域:
能源工程
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2023
·
IF 11.1
Qingyang Luo,Xianglei Liu,Haichen Yao,Peidong Wei,Jiawei Li,Yang Tian,Yimin Xuan
Latent thermal energy storage (TES) techniques utilizing phase change materials (PCMs) provide a promising way to mitigate the discrepancy between the intermittent nature of solar energy supply and consistent demand for human society. However, the development is hindered by the slow charging/discharging rates of the low thermal conductivity PCMs. Meanwhile, the high value-added utilization of waste plastic is receiving increasing attention as an environmentally sustainable strategy. In this regard, waste polyvinyl chloride (PVC) is recovered as SiC skeletons to obtain green phase change composites (PCCs) for waste heat recovery. After being infiltrated with paraffin wax (OP44E), proposed PCCs demonstrate a high retention ratio of latent heat up to 91.1% and a thermal conductivity of 2.4 W·m −1 ·K −1 , which is benefitted from limited expansion and impurity remove process, respectively. With the elevated thermal conductivity and spectral absorptance , proposed PCCs exhibit superior solar-thermal energy storage rates. Furthermore, numerical simulation of the thermal charging/discharging performance and flow characteristics is carried out for the packed bed TES system . The results reveal a reduction in charging and discharging time by 21% and 41.1% for proposed PCCs, respectively. This work introduces a novel strategy for recycling waste heat via high-performance TES and repurposing waste plastics simultaneously.
研究领域:
能源与环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Shiyang Li,Longdou Tu,Yeqiang Lu,Mingjie Lin,Junmei Ma,Chaojie Bai,Congjie Gao,Lixin Xue
A novel strategy was developed to build high-performance thin film composite (TFC) total heat exchange membranes (THEMs) by in situ growing ZIF-8 crystalline micro-leaves (ZIF-L) from Polyethyleneimine (PEI) coated on polysulfone (PSF) ultra-filtration substrates. It was found that flexible PEI polymeric chains could tightly cross-link and seal large masses of ZIF-L micro-leaves (ZIF/PEI wt. ratio up to 18.5) to thwart CO 2 permeation, on top of PSF substrate. Such PEI cross-linking could also effectively open up the internal channels of ZIF-L micro-leaves to enhance moisture permeance and latent heat recovery without trading off CO 2 gas barring property. ZIF-L in varied shapes protruded into the air stream could provide ultra-rough surfaces with increased surface area for improved total energy recovery efficiency. Optimized PEI/ZIF-L TFC THEMs showed ultra-low CO 2 permeance of 0.5–8 GPU and ultra-high total heat recovery rates of 68–74%.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2021
·
IF 17.881
Xilong Kang,Shuhai Jia,Renyi Xu,Saibei Liu,Jun Peng,Hongqiang Yu,Xing Zhou
Waste heat is very abundant and widespread in our lives. Using pyroelectric generators (PEG) to capture the ambient heat energy is meaningful. Here we fabricated a highly efficient PEG using nanocomposite . The nanocomposite was made of P(VDF-TrFE-CFE) and barium strontium titanate (BST) nanoparticles and boron nitride (BN) nanosheets , which has excellent thermal conductivity and high polarization. The output current density of PEG can reach 1.7 μA/cm 2 , it is a great improvement for PEG devices. In addition, we present a new evaluation method for standardizing the performance of a PEG, which is use η (the ratio between the power density and the heat flux) as the thermos-electric conversion efficiency of PEG. Furthermore, a PEG-unit was designed and fabricated, which was cleverly connected by PEG and a plane spiral spring, it can better utilize external vibration to realize waste heat recovery without auxiliary device. The PEG-unit can be used for energy recovery in the process of train running and it can light up the LED lamp bead for 10 s within five minutes operation.
研究领域:
能源科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Ze-Jin Xiong,Di Wu,Shu-Jie Hu,Meng-Yue Zhang,Hong Liu,Yuan Liu
Recovering low-grade heat from source-separated urine in eco-toilets reduces on conventional energy sources, lowers greenhouse gas emissions, and enhances energy efficiency, contributing to environmental protection and economic benefits. However, challenges such as the small volume, unstable source, and intermittent discharge of urine, result in rapid heat dissipation. Traditional wastewater heat recovery methods struggle to utilize this heat, hindering the exploration of multifunctional eco-toilets. In this study, thermoelectrochemical cell (TEC) was employed for in-situ low-grade heat recovery with simulated urine as heat source and air as the cold source, applying temperature gradient to drive thermoelectric conversion process. The impacts of flow rate and temperature gradient on the TEC performance were studied, and the process stability and environmental adaptability of TEC under dynamic environmental conditions (such as seasonal variations and toilet frequency) were evaluated. The results indicated that the TEC system achieved its maximum operational performance under optimal conditions of a flow rate of 40 mL/min and a temperature difference of 27°C, reaching a maximum Carnot efficiency of 0.0153%. The system demonstrated strong adaptability in high-temperature environments and quickly responded to heat input in simulations of varying toilet usage frequencies, maintaining stable operation under diverse conditions. These results highlight the potential of TEC for in-situ low-grade heat recovery from urine, with promising applications in dynamic real-world environments.
研究领域:
环境科学
·
能源工程
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zekai Mu,Xianglei Liu,Hang Shi,Chao Song,Chunzhuo Dang,Ke Gao,Nan Sun,Cheng Tian,Hangbin Zheng,Xinrui Wang,Yimin Xuan
By converting two greenhouse gases into fuels, CO 2 reforming of CH 4 via free and clean solar energy is a promising solution to the energy shortage and global warming problems simultaneously. However, serious challenges such as limited light-to-fuel efficiency, severe catalyst aggregation, and deactivation still exist for reactors employing traditional catalyst powders. Here, Ni/MgAlO x -LDH catalysts loaded Ni foam reactor with heat recovery is proposed for highly efficient and stable CO 2 reforming under direct concentrated solar irradiation. The temperature nonuniformity is reduced by 84.3% compared to powdered systems, which benefits from the high thermal conductivity of nickel foams. Overheating is also prevented, which leads to much less carbon deposition and relieved active sites aggregation. Ultrahigh light-to-fuel efficiency of 36.51% is achieved, which is much higher than that of traditional powdered systems (23.87%). Numerical simulation results have an excellent agreement with experiments and demonstrate that heat recovery can greatly improve CRM rates by 23.8%. This work opens new routes to achieve highly efficient, stable, and scalable solar-driven CO 2 reforming via Ni/MgAlO x -LDH catalysts loaded Ni foam reactors with heat recovery.
研究领域:
化学工程
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Xian Chang,Zixuan Lv,Hang Yu,Shiyang Li,Guojun Jiang,Congjie Gao,Lixin Xue
Thin Film Composite Polyamide (TFC-PA) Total Heat Exchange Membranes (THEMs) with ultrahigh sensible heat exchange efficiency, high enthalpy exchange efficiency, high CO 2 gas barrier property were successfully prepared by interfacial polymerization between m-phenylenediamine (MPD) and trimesoyl chloride (TMC). The performances of formed THEMs could be greatly impacted by their surface roughness , thickness, surface hydrophilicity, cross-linking degree and counter-ions retention controlled by the MPD concentration, TMC concentration, reaction time and post treatment procedures. Their H 2 O permeation coefficient could be improved by increasing the surface hydrophilicity and decreasing cross-linking degrees of the formed polyamide layers while their CO 2 barrier property could be improved by retaining more counter ions in PA layers. THEMs with ultrahigh sensible heat exchange efficiency of 95%+, high enthalpy exchange efficiency of 60%–65%, greatly improved CO 2 barrier property and superior mechanical strengths could be obtained for potential applications in ERV systems.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2024
·Vol. 11
·期 10
·2309052
·
IF 14.3
Yue Hou,Zhaoyu Li,Ziyu Wang,Xingzhong Zhang,Yang Li,Chang Li,Haizhong Guo,Hongyu Yu
Thermoelectric devices (TEDs) show great potential for waste heat energy recycling and sensing. However, existing TEDs cannot be self-adapted to the complex quadratic surface, leading to significant heat loss and restricting their working scenario. Here, surface-conformable origami-TEDs (o-TEGs) are developed through programmable crease-designed origami substrates and the screen-printing TE legs. Compared with “π” structured TEDs, the origami design (with heat conductive materials) changed the heat-transferring direction of the laminated TE legs, resulting in an enhancement in enlarging Δ T / T Hot and V out by 5.02 and 3.51 times. Four o-TEDs with different creases designs are fabricated to verify the heat recycling ability on plane and central quadratic surfaces. Demonstrating a high V out density (up to 0.98 −2 at Δ T of 50 K) and good surface conformability, o-TEDs are further used in thermal touch panels attached to multiple surfaces, allowing information to be wirelessly transferred on a remote display via finger-writing.
研究领域:
材料科学
·
能源工程
·
微纳制造
·
柔性电子
·
热力学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）