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Single and multi-objective optimizations of rotary regenerative air preheater for coal-fired power plant considering the ammonium bisulfate deposition EI Scopus
期刊论文 | 2019 , 136 , 52-59 | International Journal of Thermal Sciences
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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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Parametric study of forced air cooling strategy for lithium-ion battery pack with staggered arrangement EI SCIE Scopus
期刊论文 | 2018 , 136 , 28-40 | APPLIED THERMAL ENGINEERING
WoS CC Cited Count: 11 SCOPUS Cited Count: 11
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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 :

Numerical simulation Forced air cooling Battery thermal management 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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PREPARATION and PERFORMANCE of COMPOSITE BUILDING MATERIALS with PHASE CHANGE MATERIAL for THERMAL STORAGE EI CPCI-S Scopus
会议论文 | 2017 , 143 , 125-130 | Joint Conference of the World Engineers Summit / Applied Energy Symposium and Forum - Low Carbon Cities and Urban Energy (WES-CUE)
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Abstract :

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 :

expanded graphite polyethylene glycol building material thermal storage phase change material

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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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SIMULATION ANALYSIS on SUMMER CONDITIONS of ANCIENT ARCHITECTURE of TOWER BUILDINGS BASED on CFD EI CPCI-S Scopus
会议论文 | 2017 , 143 , 313-319 | Joint Conference of the World Engineers Summit / Applied Energy Symposium and Forum - Low Carbon Cities and Urban Energy (WES-CUE)
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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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 numerical simulation high and large space 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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Field Test Analysis of a Urban Sewage Source Heat Pump System Performance EI CPCI-S Scopus
会议论文 | 2017 , 143 , 131-136 | Joint Conference of the World Engineers Summit / Applied Energy Symposium and Forum - Low Carbon Cities and Urban Energy (WES-CUE)
WoS CC Cited Count: 1 SCOPUS Cited Count: 2
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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 :

Sewage source heat pump Cooling Energy saving Heating

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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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TECHNICAL ECONOMY FEASIBILITY ANALYSIS of BIOMASS STOVE HEATING SYSTEM EI CPCI-S Scopus
会议论文 | 2017 , 143 , 144-149 | Joint Conference of the World Engineers Summit / Applied Energy Symposium and Forum - Low Carbon Cities and Urban Energy (WES-CUE)
SCOPUS Cited Count: 1
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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 Feasibility analysis Heating Economic analysis

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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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Thermal Management of Densely-packed EV Battery With Forced Air Cooling Strategies EI CPCI-S Scopus
会议论文 | 2016 , 88 , 682-688 | Applied Energy Symposium and Summit - Low Carbon Cities and Urban Energy Systems (CUE)
WoS CC Cited Count: 14 SCOPUS Cited Count: 17
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Abstract :

The modern development of electric vehicle requires higher power density to be packed into a battery pack. It is always expected that the battery can be arranged as much as possible, however, which leads to the serious thermal management issue due to the heat generation inside the battery packs. As extreme temperature affects performance, reliability, safety and lifespan of batteries, thermal management of battery system is critical to the success of all electric vehicles. The objective of this study is to explore the air cooling capability on the temperature uniformity and hotspots mitigation of a compact battery pack subject to various air flow paths, airflow rates. The numerical results show that the improvement of effective heat transfer areas between air-coolant and battery surfaces is able to obviously lower the maximum temperature and improve the maximum temperature difference in the densely-packed battery box. (C) 2016 The Authors. Published by Elsevier Ltd.

Keyword :

forced air cooling numerical simulations battery packs thermal resistance model

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GB/T 7714 Lu, Z. , Meng, X. Z. , Wei, L. C. et al. Thermal Management of Densely-packed EV Battery With Forced Air Cooling Strategies [C] . 2016 : 682-688 .
MLA Lu, Z. et al. "Thermal Management of Densely-packed EV Battery With Forced Air Cooling Strategies" . (2016) : 682-688 .
APA Lu, Z. , Meng, X. Z. , Wei, L. C. , Hu, W. Y. , Zhang, L. Y. , Jin, L. W. . Thermal Management of Densely-packed EV Battery With Forced Air Cooling Strategies . (2016) : 682-688 .
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A parametric investigation of heat transfer and friction characteristics in cylindrical oblique fin minichannel heat sink (vol 68, pg 567, 2014) SCIE Scopus
期刊论文 | 2015 , 88 , 101-101 | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | IF: 2.857
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GB/T 7714 Fan, Yan , Lee, Poh Seng , Jin, Li-Wen et al. A parametric investigation of heat transfer and friction characteristics in cylindrical oblique fin minichannel heat sink (vol 68, pg 567, 2014) [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2015 , 88 : 101-101 .
MLA Fan, Yan et al. "A parametric investigation of heat transfer and friction characteristics in cylindrical oblique fin minichannel heat sink (vol 68, pg 567, 2014)" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 88 (2015) : 101-101 .
APA Fan, Yan , Lee, Poh Seng , Jin, Li-Wen , Chua, Beng Wah , Zhang, Ding-Cai . A parametric investigation of heat transfer and friction characteristics in cylindrical oblique fin minichannel heat sink (vol 68, pg 567, 2014) . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2015 , 88 , 101-101 .
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Microfluidic concentration of sample solutes using Joule heating effects under a combined AC and DC electric field EI SCIE Scopus
期刊论文 | 2015 , 85 , 158-165 | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | IF: 2.857
WoS CC Cited Count: 4
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Abstract :

This paper reports both experimental and numerical studies of our proposed electrokinetic focusing technique. The technique utilizes a combined AC and DC field for enhancing Joule heating induced temperature gradient focusing (TGF) of sample solutes in a microfluidic device. Our experimental results show that introducing an AC field component can provide sufficient Joule heating to generate temperature gradient required for achieving TGF of sample solutes, while the electroosmotic flow is suppressed under the relatively high frequency of the AC electric field. Consequently, concentration enhancement of sample solutes is considerably increased by using the combined AC and DC electric field technique. A numerical model including a set of multi-physical governing equations is presented to describe the complex TGF of sample solutes under a combined AC and DC field, and a scaling analysis of the time scales of several transport processes is conducted to simplify the numerical model. The numerical predictions are found in reasonable agreement with the measured Joule heating induced temperature profiles and electrokinetic flow field but show less dispersive than the observed focusing band of sample solutes and slightly over-estimate the experimental concentration enhancement. Several factors such as mass dispersion and photobleaching effect can contribute to the discrepancies between the model predictions and the experimental results. (C) 2015 Elsevier Ltd. All rights reserved.

Keyword :

Microfluidic sample concentration Joule heating induced heat transfer Electrokinetic transport phenomena Temperature gradient focusing

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GB/T 7714 Ge, Zhengwei , Jin, Liwen , Yang, Chun . Microfluidic concentration of sample solutes using Joule heating effects under a combined AC and DC electric field [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2015 , 85 : 158-165 .
MLA Ge, Zhengwei et al. "Microfluidic concentration of sample solutes using Joule heating effects under a combined AC and DC electric field" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 85 (2015) : 158-165 .
APA Ge, Zhengwei , Jin, Liwen , Yang, Chun . Microfluidic concentration of sample solutes using Joule heating effects under a combined AC and DC electric field . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2015 , 85 , 158-165 .
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A parametric investigation of heat transfer and friction characteristics in cylindrical oblique fin minichannel heat sink EI SCIE Scopus
期刊论文 | 2014 , 68 , 567-584 | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | IF: 2.383
WoS CC Cited Count: 16 SCOPUS Cited Count: 16
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Abstract :

A novel cylindrical oblique fin minichannel heat sink was proposed and studied for cooling heat source with cylindrical surfaces. To optimize and analyze the heat transfer performance of the heat sink, a similarity analysis and parametric study on the geometric dimensions of the heat sink were performed. Three dimensional conjugated heat transfer simulation using CFD (Computational Fluid Dynamics) approach was used to analyze the laminar convective heat transfer and apparent friction characteristics for 43 different cylindrical heat sinks with varied geometric dimensions. The studies were performed by varying the oblique angle from 20 degrees to 45 degrees, secondary channel gap from 1 mm to 5 mm and Reynolds number from 200 to 900. In this paper, the flow distribution was also investigated and reported, as the secondary channel gap, oblique angle and Reynolds number were varied. Based on the 259 numerical data points, multiple correlations for the average Nusselt number and the apparent friction constant were formulated, verified and presented. The average deviation for the approximation of average Nusselt number is from -5.8% to 7.0% while it is from -5.1% to 7.1% for the apparent friction constant. These correlations can be used for further studies such as performance prediction or geometrical optimization. (C) 2013 Elsevier Ltd. All rights reserved.

Keyword :

Heat transfer Multiple correlation Secondary channel gap Apparent friction characteristics Oblique angle Cylindrical oblique fin minichannel

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GB/T 7714 Fan, Yan , Lee, Poh Seng , Jin, Li-Wen et al. A parametric investigation of heat transfer and friction characteristics in cylindrical oblique fin minichannel heat sink [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2014 , 68 : 567-584 .
MLA Fan, Yan et al. "A parametric investigation of heat transfer and friction characteristics in cylindrical oblique fin minichannel heat sink" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 68 (2014) : 567-584 .
APA Fan, Yan , Lee, Poh Seng , Jin, Li-Wen , Chua, Beng Wah , Zhang, Ding-Cai . A parametric investigation of heat transfer and friction characteristics in cylindrical oblique fin minichannel heat sink . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2014 , 68 , 567-584 .
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