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Abstract :
Very few studies have been reported on the fundamental mechanism analysis the augmentation of heat and mass transfer for the convection and condensation processes in the slit finned tube heat exchanger under dehumidifying conditions. By developing a 3D numerical model for the condensation of the sli...
Keyword :
condensation dehumidifying condition field synergy principle heat and mass transfer slit fin surface
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GB/T 7714 | Wang Limin , Shao Yaru , Tang Chunli et al. Numerical investigation on heat and mass transfer of slit finned tube heat exchanger with humid flue gas [J]. | Asia‐Pacific Journal of Chemical Engineering , 2022 , 17 (2) . |
MLA | Wang Limin et al. "Numerical investigation on heat and mass transfer of slit finned tube heat exchanger with humid flue gas" . | Asia‐Pacific Journal of Chemical Engineering 17 . 2 (2022) . |
APA | Wang Limin , Shao Yaru , Tang Chunli , He Yang , Jin Wanlong , Che Defu . Numerical investigation on heat and mass transfer of slit finned tube heat exchanger with humid flue gas . | Asia‐Pacific Journal of Chemical Engineering , 2022 , 17 (2) . |
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The reliable thermal conductivity of lithium-ion battery is significant for the accurate prediction of battery thermal characteristics during the charging/discharging process. Both isotropic and anisotropic thermal conductivities are commonly employed while exploring battery thermal characteristics. However, the study on the difference between the use of two thermal conductivities is relatively scarce. In this study, the isotropic and anisotropic thermal conductivities of the four commercially available lithium-ion batteries, ie, LiCoO2, LiMn2O4, LiFePO4, and Li (NiCoMn)O-2, were reviewed and evaluated numerically through the heat conduction characteristics inside the battery. The results showed that there are significant differences in the temperature distribution in the battery caused by the isotropic and anisotropic thermal conductivities, which could affect the layout and cooling effectiveness of battery thermal management system. Furthermore, the effective thermal conductivities of porous electrodes and separator were determined to establish thermal conductivity bounds of lithium-ion batteries combined with the thicknesses of battery components. The thermal conductivity bounds could be applied to evaluate the rationality of the thermal conductivity data used in battery thermal models.
Keyword :
lithium-ion battery porous material thermal characteristics thermal conductivity bounds
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GB/T 7714 | Wei, Lichuan , Lu, Zhao , Cao, Feng et al. A comprehensive study on thermal conductivity of the lithium-ion battery [J]. | INTERNATIONAL JOURNAL OF ENERGY RESEARCH , 2020 , 44 (12) : 9466-9478 . |
MLA | Wei, Lichuan et al. "A comprehensive study on thermal conductivity of the lithium-ion battery" . | INTERNATIONAL JOURNAL OF ENERGY RESEARCH 44 . 12 (2020) : 9466-9478 . |
APA | Wei, Lichuan , Lu, Zhao , Cao, Feng , Zhang, Liyu , Yang, Xi , Yu, Xiaoling et al. A comprehensive study on thermal conductivity of the lithium-ion battery . | INTERNATIONAL JOURNAL OF ENERGY RESEARCH , 2020 , 44 (12) , 9466-9478 . |
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Abstract :
Understanding the dynamics of water droplets impacting upon a solid surface is of importance from both fundamental and practical standpoints. While the impact dynamics of a water droplet upon a heated surface has been extensively studied, the impact characteristics of droplets upon a cold surface remain elusive. Here, we report the formation of a triple condensate halo observed during a water droplet impacting at low velocity upon a cold surface. Due to the interplay of droplet impact and vapor mass diffusion during the droplet spreading and cooling processes, two condensation stages occur, engendering this unique condensate halo with three distinctive bands. We further examine experimentally the effects of droplet impact velocity (in terms of Weber number) and substrate temperature on the three bands of condensate halo. We also provide scaling analyses to explain the experimental results. Our experimental investigation and theoretical analysis reported in this study reveal insights into the droplet impact dynamics and the associated condensation heat transfer. Published under license by AIP Publishing.
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GB/T 7714 | Zhao, Yugang , Zhu, Fangqi , Zhang, Hui et al. Triple condensate halo from a single water droplet impacting upon a cold surface [J]. | APPLIED PHYSICS LETTERS , 2019 , 114 (18) . |
MLA | Zhao, Yugang et al. "Triple condensate halo from a single water droplet impacting upon a cold surface" . | APPLIED PHYSICS LETTERS 114 . 18 (2019) . |
APA | Zhao, Yugang , Zhu, Fangqi , Zhang, Hui , New, Tze How , Jin, Liwen , Yang, Chun . Triple condensate halo from a single water droplet impacting upon a cold surface . | APPLIED PHYSICS LETTERS , 2019 , 114 (18) . |
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Abstract :
The relationship between lithium-ion battery performance and operating temperature is of significance in designing battery thermal management system (BTMS). In this study, two different thermal conditions, namely constant temperature condition and near-adiabatic condition are established to explore charging/discharging characteristics and heat generation behaviors of the lithium-ion battery with Li(NixCoyAlz)O-2 cathode. The objective of creating near-adiabatic condition is to discover the effect of the heat generated by battery itself on charging/discharging characteristics. The experimental results show that the battery charging characteristics are nearly independent on the charging temperature ranged from 20 degrees C to 40 degrees C, while the battery charging/discharging performance degrade dramatically for the battery temperature lower than 20 degrees C. Although the heat generated by battery itself may accelerate battery degradation during cycling due to the adverse effect of excessive temperature, however it improves the discharging performance in a suitable temperature range. This implies that a battery pack may have an excellent discharging performance without BTMS intervention at a moderate discharging rate (e.g., 0.5 C). The irreversible heat could be regarded as the sole heat source term to simplify the battery thermal model due to negligible thermal effect caused by the small amount of reversible heat when the battery is discharged at higher discharging rates.
Keyword :
Charging/discharging characteristics Heat generation behavior Lithium-ion battery Temperature-dependent
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GB/T 7714 | Lu, Z. , Yu, X. L. , Wei, L. C. et al. A comprehensive experimental study on temperature-dependent performance of lithium-ion battery [J]. | APPLIED THERMAL ENGINEERING , 2019 , 158 . |
MLA | Lu, Z. et al. "A comprehensive experimental study on temperature-dependent performance of lithium-ion battery" . | APPLIED THERMAL ENGINEERING 158 (2019) . |
APA | Lu, Z. , Yu, X. L. , Wei, L. C. , Cao, F. , Zhang, L. Y. , Meng, X. Z. et al. A comprehensive experimental study on temperature-dependent performance of lithium-ion battery . | APPLIED THERMAL ENGINEERING , 2019 , 158 . |
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Abstract :
Although much work has been done on the optimization of the recuperative heat exchangers, little attention has been paid to the optimization of rotary regenerative air preheater (RAPH) in coal-fired power plants. It is known that the ammonium bisulfate deposition (ABS) can adversely affect the safe operation of RAPH, so an improved Radian number was proposed to estimate the impact of ABS in the optimization of RAPH. The thermal hydraulic calculation program integrated with genetic algorithms was developed to conduct optimizations of RAPH. The design parameters included rotor radius, each fluid sector angle and each matrix layer height. The multi-objective optimization was carried out to maximize the effectiveness and to minimize the pressure drop from the perspective of users, while the single-objective optimization was performed to minimize the weight of the heat transfer elements from the perspective of manufacturers. The improved Radian number is more reasonable to reflect the ABS deposition compared with the original Radian number. The designer can estimate the ABS deposition status using the improved Radian number not only in the operating process but also in the design process of RAPH. The range of optimal solution becomes smaller but the rank of the Pareto solution stays unchanged with the decrease in the restriction of improved Radian number. The optimization with larger rotor radius restriction could obtain better Pareto results. The total weight of heat transfer elements could be reduced by at least 26.5% compared with that of the original design by using genetic algorithm. © 2018
Keyword :
Ammonium bisulfate Coal-fired power plant Recuperative heat exchangers Rotary air preheater Single objective optimization Thermal-hydraulic calculations Thermal-hydraulic performance Weight
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GB/T 7714 | Wang, Limin , Bu, Yufan , Li, Dechao et al. Single and multi-objective optimizations of rotary regenerative air preheater for coal-fired power plant considering the ammonium bisulfate deposition [J]. | International Journal of Thermal Sciences , 2019 , 136 : 52-59 . |
MLA | Wang, Limin et al. "Single and multi-objective optimizations of rotary regenerative air preheater for coal-fired power plant considering the ammonium bisulfate deposition" . | International Journal of Thermal Sciences 136 (2019) : 52-59 . |
APA | Wang, Limin , Bu, Yufan , Li, Dechao , Tang, Chunli , Che, Defu . Single and multi-objective optimizations of rotary regenerative air preheater for coal-fired power plant considering the ammonium bisulfate deposition . | International Journal of Thermal Sciences , 2019 , 136 , 52-59 . |
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Abstract :
Battery thermal management is critical for the success of all electric vehicles due to the effects of extreme temperature on performance, reliability and lifespan of batteries. In this study, the three-dimensional model of a stagger-arranged battery pack was developed to investigate the effects of cooling channel size and air supply strategy on the thermal behavior of battery pack. The thermal resistance model of single irregular air passage was used to validate the numerical scheme. It was found that the appropriate cooling channel size of 1 mm for 18650 lithium-ion battery was achieved based on the three key parameters, namely, the maximum temperature, the space utilization and the energy efficiency factor. The numerical results illustrate that the best cooling performance can be achieved when airflow inlet and outlet are located on the top of battery pack. The cooling energy efficiency beta decreases markedly with the increase of battery numbers along horizontal direction. As the ratio of the length of batteries along horizontal direction to battery diameter equals to 36.10, the lowest value of beta is still acceptable. The analysis indicates that packing more battery along flow direction is an appropriate solution in terms of battery power density and cooling requirement.
Keyword :
Battery thermal management Forced air cooling Numerical simulation Thermal resistance model
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GB/T 7714 | Lu, Zhao , Yu, Xiaoling , Wei, Lichuan et al. Parametric study of forced air cooling strategy for lithium-ion battery pack with staggered arrangement [J]. | APPLIED THERMAL ENGINEERING , 2018 , 136 : 28-40 . |
MLA | Lu, Zhao et al. "Parametric study of forced air cooling strategy for lithium-ion battery pack with staggered arrangement" . | APPLIED THERMAL ENGINEERING 136 (2018) : 28-40 . |
APA | Lu, Zhao , Yu, Xiaoling , Wei, Lichuan , Qiu, Yalin , Zhang, Liyu , Meng, Xiangzhao et al. Parametric study of forced air cooling strategy for lithium-ion battery pack with staggered arrangement . | APPLIED THERMAL ENGINEERING , 2018 , 136 , 28-40 . |
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Abstract :
The sewage flow rate of the urban drainage system is relatively large and generally stable, its sewage temperature range varies relatively lightly and maintains 10 similar to 15 degrees C in winter. The sewage in the drainage system can be the low grade thermal source for building heating and cooling. Sewage source heat pump technology can efficiently extract or discharge the amount of heat from the sewage in the drainage system for building heating or cooling. The field test of the actual operation thermal performance of the sewage source heat pump were carried out and investigated. The sewage source heat pump system were continuously measured for 72 hours. Based on the test datum, the average COP of the heat pump was 4.5. The relationship between energy consumption of system and energy consumption of transportation are analyzed. The analysis shows that the pump of this system cannot match the load change well and the use of variable frequency pump can improve the energy efficiency of the system. Before the use of the sewage source heat pump system, the traditional coal-fired boiler and air-cooled chiller are the heating and cooling system of this building. Compared with the traditional coal-fired boiler and air-cooled chiller, the advantages of sewage source heat pump system in energy saving, economy and environmental protection are analyzed. The results show that: Compared with the original system, direct heat exchange type sewage source heat pump system can save 53% of the primary energy consumption, reduce the annual operating cost by 11%, increase the initial investment by a factor of 14.3%, and the payback period of incremental investment is about 4.7 years. This method not only has better energy saving, saving capital benefit, but also can reduce the local pollutant emission, and has better environmental emission reduction benefits. (C) 2017 The Authors. Published by Elsevier Ltd.
Keyword :
Cooling Energy saving Heating Sewage source heat pump
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GB/T 7714 | Zhang, Qunli , Wang, Zhiming , Yin, Chaohui et al. Field Test Analysis of a Urban Sewage Source Heat Pump System Performance [C] . 2017 : 131-136 . |
MLA | Zhang, Qunli et al. "Field Test Analysis of a Urban Sewage Source Heat Pump System Performance" . (2017) : 131-136 . |
APA | Zhang, Qunli , Wang, Zhiming , Yin, Chaohui , Nie, Qian , Jin, Liwen . Field Test Analysis of a Urban Sewage Source Heat Pump System Performance . (2017) : 131-136 . |
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Abstract :
The ancient architectures of tower buildings type are representative in ancient architectures in Beijing, and compared with other types of ancient architectures, they are characterized by long distance from ground, high height of building itself, and large inner space. For the ancient architectures of tower buildings type, a proposal using floor-type fan coil air-conditioner for control of physical environment is suggested, and simulation calculation for indoor temperature field for one ancient architecture of tower building in Beijing is done using CFD software, with calculation content comprising the indoor temperature field and velocity field when the system is used in summer. The result shows that: adopting floor-type fan coil air-conditioner for summer conditions and adjusting blast amount of fan coil and blasting parameters can make air temperature agreeable and comfortable. (C) 2017 The Authors. Published by Elsevier Ltd.
Keyword :
Ancient architecture high and large space numerical simulation temperature field
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GB/T 7714 | Zhang, Qunli , Jiao, Yuqing , Cao, Mingkai et al. SIMULATION ANALYSIS on SUMMER CONDITIONS of ANCIENT ARCHITECTURE of TOWER BUILDINGS BASED on CFD [C] . 2017 : 313-319 . |
MLA | Zhang, Qunli et al. "SIMULATION ANALYSIS on SUMMER CONDITIONS of ANCIENT ARCHITECTURE of TOWER BUILDINGS BASED on CFD" . (2017) : 313-319 . |
APA | Zhang, Qunli , Jiao, Yuqing , Cao, Mingkai , Jin, Liwen . SIMULATION ANALYSIS on SUMMER CONDITIONS of ANCIENT ARCHITECTURE of TOWER BUILDINGS BASED on CFD . (2017) : 313-319 . |
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The polyethylene glycol (PEG-1000) was selected as phase change material (PCM) and the expanded perlite (EP), the granular activated carbon (GAC), the powdered activated carbon (PAC) and the expanded graphite (EG) were selected as porous adsorption materials. The composite phase change material (CPCM) was prepared by the physical adsorption method. The composite phase change materials compound with the polyethylene glycol and the expanded graphite were picked by comparing and analyzing the adsorption capacity of such four types of porous materials. And then the composite building material for theunal storage mixed with the CPCM and the cement, water-reducer, early strength agent was prepared in the pressure condition of -0.05Mpa and the constant temperature condition of 70 degrees C. Its thermal physical properties, the structural stability and the compression resistance capability of different quality proportion specimens were experimental researched. The results show that such composite building materials with CPCM appears light density, high thermal conductivity, large heat storage capacity and good stability, and its compression resistance capability can satisfy the requirement of ordinary mortar building material. (C) 2017 The Authors. Published by Elsevier Ltd.
Keyword :
building material expanded graphite phase change material polyethylene glycol thermal storage
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GB/T 7714 | Zhang, Qunli , Rao, Yang , Jiao, Yuqing et al. PREPARATION and PERFORMANCE of COMPOSITE BUILDING MATERIALS with PHASE CHANGE MATERIAL for THERMAL STORAGE [C] . 2017 : 125-130 . |
MLA | Zhang, Qunli et al. "PREPARATION and PERFORMANCE of COMPOSITE BUILDING MATERIALS with PHASE CHANGE MATERIAL for THERMAL STORAGE" . (2017) : 125-130 . |
APA | Zhang, Qunli , Rao, Yang , Jiao, Yuqing , Li, Liyan , Li, Yinlong , Jin, Liwen . PREPARATION and PERFORMANCE of COMPOSITE BUILDING MATERIALS with PHASE CHANGE MATERIAL for THERMAL STORAGE . (2017) : 125-130 . |
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Abstract :
Biomass hot blast stove is one energy source which is aimed to provide clean hot air, it is widespread and has great potential for being generated from biomass. Under the equal condition of heating load between biomass hot blast stove and natural gas blast stove, this paper investigated the economic feasibility and adaptability of a method that using biomass hot blast stove instead of natural gas blast stove. Based on the technological process and the design parameters demand such as air supply temperature, heating capacity, air flow volume of the existed natural gas hot blast stove heating project, the mathematical model and some indexes for evaluating the technical and economic feasibility of the biomass heating way were established, the difference of the technical maturity, initial investment, annual operating cost, operation maintenance, operational risk and allowance policy within the two heating way were comparative analysed, the sensitivity of factors influencing annual total investment of the biomass hot blast stove was analysed. The results show that, the ratio represented by Q(zs)/Q(zt) of annual total investment between biomass hot blast stove and natural gas hot blast stove was only 0.56 under the equal heating load, the sensitivity of factors influencing annual total investment of the biomass hot blast stove was the biomass fuel, and the many problems about biomass hot blast stove like the technology is still immature, operational risk is relatively large, policy direction is unclear, regional differences and other factors were existence. If the operation of the biomass hot blast stove is safety and the biomass fuel of the biomass hot blast stove is plenty, we will recommend using biomass hot blast stove when the ratio of Q(zs)Q(zt) was less than 1, and using natural gas blast stove when the ratio of Q(zs)/Q(zt) was more then 1.(C) 2017 The Authors. Published by Elsevier Ltd.
Keyword :
Biomass energy Biomass hot blast stove Economic analysis Feasibility analysis Heating
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GB/T 7714 | Zhang, Qunli , Ji, Yingying , Jin, Liwen . TECHNICAL ECONOMY FEASIBILITY ANALYSIS of BIOMASS STOVE HEATING SYSTEM [C] . 2017 : 144-149 . |
MLA | Zhang, Qunli et al. "TECHNICAL ECONOMY FEASIBILITY ANALYSIS of BIOMASS STOVE HEATING SYSTEM" . (2017) : 144-149 . |
APA | Zhang, Qunli , Ji, Yingying , Jin, Liwen . TECHNICAL ECONOMY FEASIBILITY ANALYSIS of BIOMASS STOVE HEATING SYSTEM . (2017) : 144-149 . |
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