bluuebunny/crossref_metadata_2025 huggingface dataset:
Market Analysis and Policy Design of LED Industry in Jiangsu Province
Authors: Jiang Guo Gang , Wang Di , Chen Jing
Published: June 2012

Jiangsu’s LED industry has some bottleneck such as the low capacity of upstream R & D and the lack of core technology and other issues. This paper argues that the key to LED industry develop in Jiangsu Province is establish a relatively sound government guidance mechanism, and put forward the system strategies from the angle of government subsidies, technological innovation, financial supporting, human resources training and international exchange, so that can promote LED industry development in Jiangsu Province, seize the top technology in domestic and international, foster the new economy growth in Jiangsu Province from long-term, achieve emission reduction target, and realize sustainable economy and society development in Jiangsu Province.
Simulation Test of Dynamic Water Pressure for Warm Mix Asphalt
Authors: Ge Zhe Sheng , Zhang Long
Published: June 2012

Warm mix asphalt may have water damage because of the low construction temperature of warm mix asphalt and the slowrate of water evaporation in aggregate. Simulation test system of dynamic water pressure for asphalt which is independent development by south china university of technology is used for evaluating the water damage resistance of warm mix asphalt under high temperature and comparatively analyzing the influence of aggregate modifying agent on the water damage resistance of warm mix asphalt. Test results show, The loss of the splitting strength is obviously decreased on 15°C and water damage resistance of warm mix asphalt is significantly improved after asphalt specimens of warm mix SMA-13 with aggregate modifying agent through 3h simulation test of dynamic water pressure on 60°C；Research results have an important meaning on reducing the early disease of warm mix asphalt in high temperature and rainy
Studies on the Design of New Countryside Green House of Hubei Province
Authors: Hua Qiu Yue , Jiang Bo
Published: June 2012

based on the analysis of the impact of the climatic characteristics of Hubei on the green house of rural areas and adoption of the method of architectural design and green energy saving with low technicalization and cost, the purpose of building energy conservation will be achieved, which is suitable for the development and promotion of the energy saving buildings in rural areas.
Study of Mechanical Properties and Physical Properties of Rubberized Portland Cement Concrete
Authors: Li Wei , Wang Xiao Chu , Liu Hong Tao
Published: June 2012

This test summers up the research situation of rubber powder modifier. According to tests of density, flexural strength, compressive strength and cleavage strength, this test analyzes the basic mechanical properties and the variation of rubberized portland cement concrete which is mixing the silica fume modifier. The results show that the flexural strength, compressive strength and cleavage strength of concrete may increase when silica fume concrete admixture modifiers is mixed in cement concrete. The workability, density, flexural strength, compressive strength, ratio of compressive strength and cleavage strength of rubberized portland cement concrete gradually reduced with the increase in dosage of rubber. The rubber particles mixed with concrete which can when the rubber particle size is not more than 30% of the dosage of coarse aggregate, the fine pavement of rubberized portland cement concrete can be got.
Visual Comfort Control for Building Energy Management System
Authors: Lin Shin Yen , Chen Wei Yuan
Published: June 2012

In this paper, we propose a two-stage energy saving control algorithm to resolve the visual comfort control problem of building energy management systems (BEMS). The first stage control method consists of a fuzzy controller to control the venetian blind so as to exploit the outdoor luminance as much as possible while avoiding the sun glare. To remedy the possible imperfection caused by the fuzzy controller, a follow up fine tuning step is designed to adjust the outputs of the venetian blind resulted from the fuzzy controller. The second stage control is to determine whether to turn on the light based on the luminance measured by the sensor after the first stage control so as to save electricity. We have simulated the proposed two-stage control algorithm and demonstrate that the electricity saving can be up to 61% in the tested room.
Analysis of the Application of Green Energy CL Structural System
Authors: Wang Dong Li , Yang Gui Fang , Li Tong
Published: June 2012

This paper describes the CL structural system and its evolutive history. By compared with other materials, the CL structural system has the following characteristics such as to reducing the weight of building, expanding area of the house, saving energy, extending the using life. The paper based on interrelated research, illustrated the application and effect of the CL structure in Qinhuangdao. In the paper, The author also explained the scope of the application of the CL structure and proposed to promote the application.
Numerical Analysis on Heat Transfer Characteristics of Double Ventilation Glass with Hot Channel
Authors: Qi Han Bing , Wang Yu Shi , Wang Qiu Shi , Wang Jing , Li Dong
Published: June 2012

The structural characteristics and heat transfer characteristics of double ventilation glass with hot channel are analyzed, whose heat transfer model is set up, we simulate air distribution of double ventilation glass with hot channel using Computational Fluid Dynamics (CFD) scheme as a simulation technique. The results show that the requirement of supplying air can be realized in winter, when the heating plates are set up in the hot channel, the air temperature of outlet is 290 K, and the flow rate of outlet is 1.03 m/s; which can be realized in summer, when the cooling plates are set up in the hot channel, the air temperature of outlet is 290 K, and the flow rate of outlet is 1.12m/s.
Research on Thermal Storage Effect of Floor Heating System with Phase Change Energy Storage
Authors: Feng Guo Hui , Huang Kai Liang , Liu Xin , Li Hui Xing
Published: June 2012

The floor heating system of phase change energy storage (FHSPC), performing well in storing and releasing thermal energy, plays a significant role in using solar energy and low-priced nocturnal electrical power for heating. However, due to such problems as ineffective package and insufficient overall integration of phase change material, research of FHSPC has not made progress in practical application. This paper researches thermal storage effect of a new floor heating system of phase change energy storage using solar hot water as the heat source and double layers of capillary network as the heat dissipation end. Differential scanning calorimeter was used to choose capric acid as the main energy storage material. For a steady heating cycle of heating for 8 hours and releasing for 16 hours, acceptable thermal condition is observed in the test room. The new FHSPC could provide long span intermittent heating with little heat loss, therefore the intermittent energy source can be well utilized
Strength and Toughness of Steel Fiber Reinforced Heavy Concrete
Authors: Kan Yu Cheng , Yang Hsuan Chih , Pei Kuang Chih
Published: June 2012

This paper presents an experimental study dealing with the toughness of heavy concrete based on the ASTM C1018. Mixtures including 0%, 0.5%, 1.0% and 1.5% of steel fiber content by volume are designated, which are developed based on a mixture used in Kuosheng nuclear power plant in Taiwan. Metallic aggregates of iron shots and iron ore take 48.8% by volume in that mixture. Test results reveal that the compressive strength and rupture modulus of heavy concrete turn out higher than those of normal concrete. In addition, flexural toughness of heavy concrete grow with the steel fiber fraction, which is valid and appropriate for construction of shielding structure and spent fuel cask.
Preparation of Unburned Brick from the High Titania Blast Furnace Slag and Styrene-Acrylate Emulsion
Authors: Kong Xiang Wen , Wang Dan
Published: June 2012

The unburned brick was prepared by using the high titania blast furnace slag as an aggregate, styrene-acrylate emulsion as cementing materials and two admixtures. Factors such as amounts of admixtures and styrene-acrylate emulsion, forming pressure and curing time on the properties of the products were studied. The optimal process conditions for preparing the brick sample were as follows: mass fractions of the slag, styrene-acrylate emulsion, admixture 1, admixture 2 and water were respectively 70%, 8%, 8%, 10% and 4%, forming pressure 30 MPa, curing time 7 d. The properties of the brick sample prepared under these process conditions are better than that of MU 25 in GB / T 2542 - 2003.
SCC Produced with Recycled Concrete Aggregates
Authors: Yong Yuan , Takao Ueda , Yu Chun Long
Published: June 2012

The major content in concrete is aggregates. Reduce its usage and replaced with recycled concrete aggregate (RCA) could not only mitigate consuming of natural resources but avoid the treatment of solid wastes. Furthermore, producing self-compacting concrete (SCC) with RCA is a way for traditional construction industry in saving energy and avoiding noise emission. To seek the proper way in preparation of SCC with RCA, preparation of RCA, composition design, microstructure evolution with hydration, and mechanical properties are investigated within this study. It is found that successful producing of SCC with RCA is not a complicated process.
Experimental Research the Pavement Performance on Chloride-Based Weak Saline Soil
Authors: Liu Jun Yong , Zhang Liu Jun , Yin Li Hua
Published: June 2012

The pavement performance (CBR and modulus of resilient) of the weak chloride-based saline soil was studied by experiment. Samples were made through the static pressure method and vibration method. The test results for the samples under the conditions of non-soaking and soaking made a comparative study. The weak saline soil was analyzed as embankment feasibility. The results showed that: the pavement performance of samples made by vibration method was superior to that of static pressure method; the CBR value and modulus of resilient of samples could meet standard requirements when degree of compaction met the standard requirements. Weak chloride-based saline soil proved to be the road embankment fillers.
Filling Technology and Disease Prevention Technology Research on Highway Rock Salt Embankment
Authors: Liu Jun Yong , Zhang Liu Jun , Zhang Wei
Published: June 2012

The engineering properties of rock salt in the salt lake region were studied by the geotechnical investigation, physical and mechanical tests and microstructural scanning. The results showed: the rock salt had many characteristics such as thicker layer, higher salt content, larger solubility, quicker leaching rate and easier dissolveing softening; natural rock salt close-grained microstructure and high limit compressive strength; rock salt did not soften and had smaller residual strain, which proved that rock salt was a suitable embankment packing in cyclic loading. Filling technology and disease prevention techniques of rock salt embankment are raised by combining new construction of the Qarham - Golmud highway and paving test road of rock salt embankment.
Assessment on Biogas Utilizations in Rural Areas in Urumqi, Xinjiang
Authors: Ma Xiao Li , Chang I Shin , Wu Jing
Published: June 2012

As the effective and efficient means of resources utilization, biomass energy has become a very valuable and reliable source of alternative energy in China, especially for remote areas and countryside. First, in order to facilitate the development of biogas applications and promote the economic, social and ecological benefits from comprehensive utilization of biogas in rural areas in Urumqi (Capital of Xinjiang Uygur Autonomous Region, XUAR), the biogas potential was estimated, the biogas engineering construction and biogas comprehensive utilization were evaluated, and the existing problems of biogas development were analyzed, in this study. Second, countermeasures and recommendations were proposed in trying to resolved existing problems, based on international practical experience. And, according to local climatic situation and regional characteristics in Urumqi, ecological agriculture was proposed in this study as the development mode for the rural areas in Urumqi, based on the development of biogas technologies and international practical experience.
A Study on the Features of NO Formation in the Cylinder of Biodiesel Engine
Authors: Mei De Qing , Zhang Yong Tao , Yuan Yin Nan
Published: June 2012

Abstract. A thermal mechanism of NO formation is developed to predict NO emission in the diesel engine and the explanation of more NOx emissions from the biodiesel engine exhaust is put forward. The start of ignition of biodiesel engine is early and so the trigger temperature of NO formation in cylinder is reached early. The mean temperature in cylinder will decrease in biodiesel engine. However, the concentration of oxygen at the combustion area is high due to the oxygenated property of biodiesel. Both of the two ways contribute to the more NOx emissions from biodiesel engine exhaust.
Analysis and Calculation of Complete Combustion Level of Biodiesel Compared with Diesel
Authors: Ma Zhi Yi , Zhao Fu Lei , Li Ya Peng , Lv Meng , Xue Le , Zhang Teng
Published: June 2012

Many studies and experiments prove that biodiesel produces less CO, HC and smoke emissions, produces more NOX emission and burns more completely than diesel. Firstly, for evaluating complete combustion level for biodiesel compared with diesel, the paper indicates that heat release ratio can not act independently as the standard; secondly the second maximal heat release ratio and combustion beginning crank angles are combined with Peak heat release ratio; lastly, CAcenter(the corresponding crank angle of centric of instantaneous heat release ratio curve) is introduced and it is the best factor which can accurately reflect the complete combustion level of biodiesel.
Design of Biodiesel Production Processes by Base-Catalyzed Transesterification
Authors: Shi Hong Yan , Yuan Ming Zhe , Wang Tian Ran
Published: June 2012

A lot of efforts have been carried out to develop an alternative fuel for the current energy and environment questions. Biodiesel which is synthesized by transesterification of plant oils and animal fat is a real alternative fuel for its renewable and lower emissions. Currently, biodiesel production by the base-catalyzed transesterification of the vegetable oil and methanol is widely utilized in the world. This paper studies the design of biodiesel production with the glycerol phase separation processes, through installing a decanter between reactors and adding methanol and NaOH batch optimization operation to improve the biodiesel yield and the conversion rate of reactants. Simulation results show that biodiesel yield increased by 9.79% and triglyceride conversion rate increased by 6.99%.
Optimize the Process that choose the Acetic Acid to Pretreat the Straw Biomass of Raw Materials which Used to Photosynthetic Hydrogen Production
Authors: Jiang Dan Ping , Zhang Quan Guo , Shen Xiang Wei , Yue Jiang Zhi , Wang Yi
Published: June 2012

The main purpose of the pretreatment of straw raw materials which used to produce hydrogen is to remove lignin and hemicellulose, reduce the degree of crystallinity of cellulose, as well as improve the porosity of the matrix is the key technology of cellulose into hydrogen,which designed to improve the materials, low the production costs. This paper mainly studies how to process the optimization that used Straw biomass of raw materials which pretreated with acetic acid to hydrogen production. To optimize the process of pretreatment of acetic acid. separat the rate of sugar yield as the ability of straw biomass of raw materials to product hydrogen, The results show that: when the particle size of the agriculture as a straw is straw with 25% acetic acid used and the solid-liquid ratio is 1:20, to pretreat 30min at 121 °C, can get the highest sugar rate.
Study on the Energy-Efficient Production of Fuel Ethanol by Cassava Absorbent
Authors: Song Jia , Zhu Yue Lin , Zhang Si
Published: June 2012

The energy-efficient production of fuel ethanol though fixed-bed absorption by use of cassava absorbent was studied. The cassava absorbent was desiccated to absorb the water in the ethanol, making its quality score from 75%~95% up to 99.5%.The absorption performance of cassava power was investigated from the aspects of power size ,quality ratio of absorbent and solution, temperature of absorption and the ratio of airflow. The analysis of the result indicated that the best technological parameter for the above method were as follows: particle size was between 1.6mm and 2.5mm,quality ratio of absorbent and solution was equal to1:6, temperature of absorption was 90°C and the ratio of airflow was 105°C on the characterized temperature.
Research on Prediction of the Wind Power Installed Capacity in China Based on MV Optimum Combined Model
Authors: Niu Dong Xiao , Wang Guan Qing , Li Hong Juan , Zhang Hong Yun
Published: June 2012

In the background of global energy conservation and emission reduction, the wind as the most potential renewable energy for the development has been developed rapidly in multiple countries. In recent years, the wind power generation in China gets fast development supported by many national policies, and accumulative total installed capacity has reached the world's first in 2010. This paper makes the prediction through the gray model, the trend fitting model and MV optimum combined model respectively, and the result shows that the relative accuracy of MV method is higher than the other methods for the prediction of wind generating capacity in China.
A Simulation of PV Module and MPPT Control Based on Matlab/Simulink
Authors: Sun Kang Wen , Liu Chun Yang , Liang Gao Ming , Zhu Ming
Published: June 2012

The simulation model of PV module, which is based on Simulink software, the mathematical model and the equivalent circuit of PV module, is established in this paper. This PV module model can be used to show the output characteristics of PV module under different irradiations and temperatures. Moreover, this model can be extended to various parameters of PV modules and used to study parallel and serial characteristics of PV module. The output characteristics of PV module, which is affected greatly by light irradiation and ambient temperature, has obvious non-linear features. Therefore, a maximum power point tracker (MPPT) is needed. Compared with perturbation and observation (P&Q) control method and other MPPT control methods, incremental conductance (IncCond) method may be unease to be adopted because it needs a high-performance controller which is costliness. However, as IncCond method is suitable for the irradiation situation of both rapid and slow changes, it has important research meanings. Meanwhile, aiming at the disadvantage of a fixed tracking step size, a improved control method is put forward and simulated in this paper. Finally the simuliation results verify the accuracy and superiority of the improved IncCond method.
An Inverter can be Used in Hybrid Wind-Solar Grid-Connected Power System
Authors: Tian Yang , Han Ru Cheng , Li Chen
Published: June 2012

With increasing concern of global warming, many are looking at sustainable energy solutions to protect the earth for the future generations.. This paper presents a new inverter which can be used in hybrid wind/photovoltaic grid-connected power system. This inverter allows the two sources to work separately or simultaneously depending on the availability of the energy sources. Harmonic content is detrimental for the Grid security. The introduction of the inverter can effectively reduce the harmonics generated by the system. Operational analysis of the proposed system will be discussed in this paper. Simulation results are given to highlight the merits of the proposed inverter.
Development of a Robotic Kite to Generate Electricity from Wind
Authors: Zhang Hong , Fitzpatrick Kyle , Bhatia Krishan
Published: June 2012

In the pursuit of renewable energy, high altitude wind is gaining increased attention for its better strength, steadiness, and coverage over the ground wind. In this paper, we will describe our development on EHAWK (Electric from High Altitude Wind with Kite), a robotic kite system to generate electricity from wind. So far we have designed and tested several generations of EHAWK systems and gained experiences on harnessing the high altitude wind on both experimental and theoretical fronts.
Large WTGS and the Operation Conditions Simulated
Authors: Wang Xing An , Zhang Ju Liang , Guo Gai Xia , Jin Hua Rong , Bao Gan Du
Published: June 2012

Due to the large WTGS experiment difficulties, running environment complex and changeable, running condition is not prediction and not reproducibility and other characteristics, so the wind power control system development and testing of extremely limited. This paper introduce a large-scale WTGS main control test system, of which the WTGS model is built to simulate operation conditions of wind farm. By this way, reproducing the operation conditions is available, testing and debugging WTGS can go well without the influence of the randomness and intermittence of wind.
Meteorological Data Acquisition System Based on Wind Power Prediction Methods and Research
Authors: Hu Wei Tong , Zhang Yu Xuan , Fan Li Guo
Published: June 2012

Wind energy as a clean and can continue to use the new energy is widely used in central and western regions of China. Wind power has a strong volatility, when the large capacity of wind power connected to the grid, this volatility has many negative effects on the safe and stable operation of the grid. Therefore, the wind power prediction system has become the most wind farm necessary security early warning systems. There is an important part of the system that is called the wind power meteorological data acquisition system and its function is to provide for the system the original meteorological data, meteorological data will become an important basis for the prediction function. This article will describe the developed by the Changchun Meteorological Instrument Research Institute, "AMS-II-E wind electric power meteorological data acquisition system", the composition and the core processing algorithms. The system has been equipped with 15 wind power plants in four provinces in China (Inner Mongolia, Jilin, Liaoning, Jiangsu).
A Combined Solar Disc Power Generation and Desalination System
Authors: Zhang Wen Qiang , Wen Hao Bai , Zhuang Fei Fei , Ren Shuo Jin , Wen Ye , Li Ke Liang , Xin Gong Ming
Published: June 2012

A system is designed to combine the solar disc power generation and desalination in this paper. The steam generated in the solar disc system goes into the low-parameter steam turbine to produce electricity. Then the exhaust steam heats seawater in the desalination device, acting as a low temperature heat reservoir which makes the seawater boils to dilute. A tracking system adopting the "Date-time - latitude-longitude - sunlight incident angle" match pattern is designed to track the position of the sun, in order to achieve the maximum solar power input.
Research of SC for Improving LVRT Capability of FSIG
Authors: Li Guo Qing , Wang Li Meng
Published: June 2012

The fast development of wind power generation brings new requirements for wind turbine integration to grid. In order to improve the lower voltage ride through(LVRT) capability of fixed speed induction generator(FSIG) in wind power generating systems, the mathematic model of FSIG, supercapacitor(SC) and converter is built in DIgSILENT in this paper. A control strategy for FSIG and SC based on wind farms is proposed to enhance the terminal voltage of point of common coupling (PCC) after the clearance of an external short circuit fault. The simulation results show that the terminal voltage of PCC can be significantly improved when there is extra active and reactive power compensation available from SC.
The Control Strategy Study of Doubly-Fed Wind Turbine Participated in Frequency Regulation
Authors: Zhou Xiao Hua , Wang Ming Qiang , Zou Wei Wei
Published: June 2012

Traditional decoupling control strategy of doubly-fed induction generator (DFIG) wind turbine makes little contribution to system inertia and do not participate in the system frequency control, the synchronization of large-scale wind power requires wind turbine have the ability to participate in the regulation of power system frequency. This paper adds a frequency control segment to traditional DFIG wind turbine and considers the doubly-fed wind turbine operating on the state of the super-synchronous speed, by analysis the effect of inertia and proportional control strategies, a fuzzy control strategy which combines the advantages of the former two control strategies is proposed, simulation results show that this control strategy can more effectively improve the system frequency response.
Development of Creep Similar Material for Salt Rock Energy Storage Medium
Authors: Chen Jie , Jiang De Yi , Ren Song , Guo Song Tao , Deng Tao
Published: June 2012

The Jintan energy storage of salt rock in Jiangsu Province is a demonstration project; and the creep similar material is made up of fine iron, coarse salt rock, fine salt powder, epoxy rosin and ethylenediamine. According to the similarity theory and measured physical and mechanical parameters of salt rock from Jintan, the uniaxial compressive test, creep test, different material proportions are carried out on the similar material. And we found that the bulk density, Poisson’s ration, elastic modulus, compressive strength and deformation characters of the similar material are similarly with the Jintan salt rock. Especially, the creep behavior of similar materials can reflect the Jintan salt rock long-term creep with a relatively short time, which supplies reliable similitude model material for energy storage long-term creep test.
Novel Clathrate Materials for Hydrogen Storage: H2 Store in N2 Hydrate
Authors: Liu Chang Ling , Meng Qing Guo , Li Cheng Feng , Ye Yu Guang
Published: June 2012

In recent years, solid clathrate gas hydrates are considered to be promising materials for hydrogen storage because they can trap molecular hydrogen within their cages formed by a hydrogen-bond water network. In this paper, we firstly synthesized the nitrogen hydrates, and then used these hydrates for hydrogen storage. The H2 storage potential in these hydrates is investigated by Raman spectrometry technique. The spectral properties show that the multiple H2 occupancies of large cages of N2 hydrates have been realized under mild condition (16 MPa and 255 K) when exposing N2 hydrates in pressurized H2 gas. The results suggest that nitrogen clathrate hydrates are prospective media for H2 storage and may help to design and produce new hydrogen storage materials.
Numerical Investigation of Nanoparticle-Enhanced High Temperature Phase Change Material for Solar Energy Storage
Authors: Guo Cha Xiu , Wang Ya Hui
Published: June 2012

In order to store the solar energy efficiently, high temperature phase change material (HTPCM) through dispersion of nanoparticles is reported. Based on the enthalpy-porosity approach, the numerical model is first validated by comparing the results of the reference. Then the melting processes of HTPCM with different mass fraction nanoparticles in an enclosure are conducted. Results show that nanoparticles can greatly increase melting rate, compared with that of HTPCM, so nanoparticle-enhanced phase high temperature change material (NEHTPCM) has a promising application for solar energy storage.
Study on Application of Energy Storage System in PV System
Authors: Li Jian Lin , Ma Hui Meng , Xie Zhi Jia
Published: June 2012

Recently, a lot of PV power systems ranging from 1MW to 10MW have been built in China. However, the power grid can’t accept so much PV power because of their oscillated output power. PV systems are affected by the weather condition a lot, such as the sunlight and the temperature. Embedding energy storage system into PV system could improve the grid-access performance of PV systems as well as expand the functions of original PV systems, including regulating power quality of grid. In this paper, PV-storage topology is presented and the flow direction control (FDC) method is described. Based on the operation data of a 100kW PV system in a certain place of China, simulation studies are performed. The result of simulation verifies the possibility and necessity of building the energy storage system in the PV system. With the decline of the cost of energy storage system and PV system, the development of renewable energy in China will be accelerated and supported by the combination of PV system and energy storage system.
The Effect of Air Injector on the Performance of Airlift
Authors: Hu Dong , Tang Chuan Lin , Zhang Feng Hua
Published: June 2012

In order to investigate the air injection method on the performance of an airlift. For this purpose an air lift system with a riser 2000 mm long and 80 mm in diameter, was designed and tested. Seven different air injection methods were used at a constant submergence. The experimental results showed a marked effect on the airlift performance when operated with different air injection methods. The arrangement of five nozzles gives the best performance, and the one nozzle is the worst. Although the injection angle has a little effect on the airlift performance, but view the general conclusions as a whole, the best lifting efficiency can be obtained when the angle of the nozzle placed along the tangential direction of pipe wall is equal to 10º at a given air flow rate QG =37m3/h.
The Modal Analysis and Optimum Structure Design of Automobile Air Cleaner
Authors: Zhang Fang , Zhou Hong
Published: June 2012

In this paper, a finite element model of an automotive air cleaner is established. Through the free modal analysis of this FEA model, combined with Modal Testing which modified the FEA model, different order modal frequency and modal characteristics are acquired, which supply the reference standard for dynamic design. According to the analysis, the local unreasonable structure will be optimized.
Evaporation Characteristics of Single Water Droplet in Ice Slurry Production System of Evaporative Supercooled Water
Authors: Yan Jun Hai , Zhang Xiao Song , Zhou Bin
Published: June 2012

To analyze the evaporation characteristics of single water droplet in the air with low temperature and low humidity, a theoretical model of droplet heat and mass transfer was proposed. The evaporation process of droplet in supercooled stage was simulated through theoretical model, results from modeling basically tallies with experiment, thus it is feasible to predict the evaporation characteristics of water droplet with smaller diameter by the mathematical model. The evaporative supercooled process of droplet in ice-slurry production system was calculated using the above-mentioned theoretical model. Results show that both the smaller droplet diameter and the lower droplet initial temperature can increase the cooling rate of water, in addition, the cooling rate can also be increased with the increase of air velocity or with the decrease of air temperature. Futhermore, droplet with lower supercooled temperature can be obtained with lower the air temperature. The initial droplet diameter less than 100µm can not only greatly improve the supercooling degree when the evaporative time of droplet is same, but also decrease the height of the ice making chamber.
Experimental Study on Ice Storage System for a Small High Temperature Cold Store
Authors: Cui Jian Ning , Liu Yi Tao , Han Xu
Published: June 2012

The ice storage system for a small high temperature cold store is introduced in details with the principle, structure, design and experimental methods. This system was tested in all possible conditions, and the performance in super cooling condition was compared with the ordinary condition. The results show that the cold store cooling system using ice storage technology could adapt to the power supply better, and reduce the power expense effectively.
Process Optimization of One-Stage Propane Pre-Cooled MRC Cycle for Small-Scale LNG Plant
Authors: Sun Heng , Shu Dan , Zhu Hong Mei
Published: June 2012

One-stage pre-cooled mixture refrigerant cycle can be applied in small-scale LNG plant and be special suitable for skit mounted LNG plant. It has different character with the C3MR cycle used in large-scale LNG plant. The optimization of the mixture refrigerant is carried out using HYSYS software. The effect of the main process parameters on the performance of the cycle is calculated and discussed. The result shows that appropriate ranges of the process parameters exist. Higher and lower values of the parameters will increase the energy consumption significantly. The results also indicate that the optimization of the one-stage pre-cooled mixture refrigerant cycle can obtain rather high energy efficiency that is competitive with that of the SMR which is widely employed in small-scale LNG plant.
ATC Enhancement with SVC and TCSC Using PTDF Based Approach in Deregulated Electricity Markets
Authors: Kumar Jitendra , Kumar Ashwani , Gao Wen Zhong , Yan Shi Jie , Wang Jian Hui , Gu Shu Sheng
Published: June 2012

In this paper, power transfer distribution factor based on AC load flow has been proposed for multi-transaction environment in the presence of FACTS devices viz. SVC and TCSC. The method can be implemented for any number of transactions occurring simultaneously between sellers and buyer buses with FACTS devices. The results have been determined for intact and line contingency cases. The results have also been obtained with DC method for comparison under intact and contingency cases. The proposed method have been applied for IEEE 24 bus RTS.
Overhead Line Fault Location Using Wavelet Packet Decomposition and Support Vector Regression
Authors: Fei Chun Guo , Su Bai Li
Published: June 2012

This paper realizes the fault location in overhead line by using wavelet packet decomposition (WPD) and support vector regression (SVR). All various types of faults at different locations and various fault inception angles on a 735kV-360km overhead line power system are used. The system only utilizes voltage signals with single-end measurements. WPD is used to extract distinctive features from 1/2 cycle of post fault signals after noises have been eliminated by low pass filter. A SVR is trained with features obtained from WPD and consequently used in precise location of fault on the transmission line. The simulation results show, fault location on transmission line can be determined rapidly and correctly irrespective of fault impedance.
Spatial Load Forecasting of Distribution Network Based on Intuitionistic Fuzzy Entropy and Fuzzy Clustering
Authors: Liu Lu Jie , Fu Yang , Ma Shi Wei , Hu Rong
Published: June 2012

Load density index method is one of widely used spatial load forecasting techniques in distribution planning. The determination of load density is a key task for this method. In order to overcome the drawback of traditional method which adopts analogy method to obtain load density and is hard to meet the demand of precision, a new approach based on intuitionistic fuzzy entropy and fuzzy clustering is proposed. The fuzzy clustering analysis is adopted to classify the set of load density and impacting factors into several grades. Then the intuitionistic fuzzy theory is utilized to describe the uncertainty that would appear in the load density selection. According to the intuitionistic fuzzy entropy the grade of load density can be selected, and the load density interval is available by the fuzzy clustering from the grade selected. An example is used to demonstrate the validity of the proposed method.
A Review on Application of Piezoelectric Energy Harvesting Technology
Authors: Sun Chun Hua , Shang Guang Qing , Tao Yi Yi , Li Zhi Rong
Published: June 2012

In recent years, significant progress has been made with in-deep application of piezoelectric harvesting energy technology. To make the technology development more convenient, a comprehensive review on application of piezoelectric harvesting technology is made in the paper. Piezoelectric harvesting devices as power source from vibration, human motion and so on are expounded. The technology would bring fast increasing in systems of micro wireless sensor, integrated systems and self-power MEMS.
Long Term Forecast of Electric Load in Beijing
Authors: Yan Qing You , Liu Zhi Yu , He Si Qi
Published: June 2012

Accurate forecast of electric load provides scientific grounds for national departments to plan how to produce electric power or how to use it and it also benefits the maintenance and construction plan of power grid to improve power supply security. Now the demand of electric power in Beijing increases yearly due to sustained economic development, the electric-load-forecast is practical for Beijing to prepare future development of its electric power. This paper selected 1973~2008 data of Beijing to test the causality between economy and electric load. Then it established equation based on cointegration theory to forecast electric load in future years.
Collocation Trefftz Method for the Heat Conduction Issue in Irregular Domain with Non-Linear Boundary Condition
Authors: Fan Hong Ming , Yu Hang , Zhang Dan
Published: June 2012

Rules for nonlinear borders of irregular domain is the thorny issues when using analytical method for solving mathematical and physical equations. On the basis of solution in the form of separated variables, the border of arbitrary shape with non-orthogonal boundary will be separated into a limited number of discrete points, and then direct assignment for the form solution at each of the discrete points on the border according to boundary conditions, at every discrete points on the border can establish an equation. If the number of discrete points on the border is equal with truncated series after retained series, all coefficients of the form solution can be determined and the problem solved. This paper use Laplace equation as an example to illustrate Collocation Trefftz Method can solve certain steady heat conduction problems within irregular domain with non-linear border.
Analysis of Harmonic Detection of APF&SVG
Authors: Shen Jing Shuang , Jiang Chuan Wen , Liu Yu Jiao
Published: June 2012

This paper reviews the harmonic current detection algorithm of APF&SVG. And the new different research of each detection method is introduced. The advantage and disadvantage of each methods is also analyzed. It has provided some references to the electric current detection algorithm choice for the design of the APF and SVG.
Detecting the Number of Signals at Low Signal-to-Noise Ratios
Authors: Zhai Hong Cun , Xu Xiang Yi
Published: June 2012

To improve the multi-target detection performance of sensor arrays at low signal-to-noise ratios, a new method called DTAE（Detection Technique based on Approximate Eigenvectors）is proposed. In the proposed method, the approximate eigenvectors of the signal subspace corresponding to the estimate of the source cluster centroid are computed first, then the array output data are weighted by the approximate eigenvectors, finally the estimate of the number of signals is acquired by a certain criterion using the information of the peak-to-average power ratio of the weighted data in frequency domain. Simulations show DTAE demonstrates better detection performance than traditional methods such as EDT(Eigenvector Detection Technique) and AIC（Akaike Information Criterion）etc. at low SNR.
A Novel Control Strategy for Three-Phase Four-Wire STATCOM
Authors: Yun Wei Jun , Yao Gang , Zhou Li Dan , Chen Chen , Pan Jun Min
Published: June 2012

Nowadays Static Synchronous Compensator (STATCOM) has gradually become one of the representative techniques in the field of dynamic reactive power compensation in the power distribution system. This paper analyzed the topology and the voltage imbalance problem of the up and down capacitors on DC side of the three-phase four-wire STATCOM. In allusion to the imbalance problem of neutral point, a novel control strategy based on the control of zero-sequence current was proposed. By the triple close-loop control strategy, the STATCOM can achieve great control accuracy and dynamic performance. Simulation result proves that the proposed control method is effective.
Magnetic Induction Effect of Fe73.5Cu1Nb3Si13.5B9 Amorphous Ribbons by Mutual Induction
Authors: Jiang Da Guo , Ye Yuan Xiu , Wu Si Ying
Published: June 2012

Influence of frequency on the magnetic induction effect of Fe73.5Cu1Nb3Si13.5B9amorphous ribbons by mutual induction was studied.The results showed that the magnetic induction effect increased with the higher frequency; with the increased of frequency,after a bigger rangeability of magnetic induction effect,there was a smaller one.
AHP-Based Optimal Selection of Cold and Heat Sources for Pump System
Authors: Wang Jin Ling , Sun Li Ying , Liu Fei Xiong
Published: June 2012

The application of heat pump technology is one of the effective ways to realize energy conservation and emission reduction of air conditioning systems. In this paper a certain office building in Beijing is taken as an example, the annual cooling and heating load calculation is carried out. We select four cold and heat sources schemes to do comparative study, the four schemes are: air source heat pump, ground source heat pump, well water source heat pump and solar-ground coupled heat pump. The economy, characteristics and the impact on environment of each scheme are calculated and analyzed, and the Analytic Hierarchy Process (AHP) is used to comprehensively evaluate the four kinds of schemes. The results show that the comprehensive performance of well water source heat pump system is better than the other three schemes. Otherwise AHP provides a simple and practical method and basis for the heat and cold sources scheme selection and assessment.
Numerical Investigation of Recirculation of Air-Cooled Condensers for a Large Power Plant
Authors: Zhao Wan Li , Yan Wen Zhou , Xu Can Bing
Published: June 2012

In order to minimize the recirculation to ensure normal operation of the air-cooled condensers (ACC) system, the recirculation phenomenon and its dependence on ambient winds are numerically simulated by using the computational fluid dynamics code, FLUENT. Under the constant ambient temperature, the effects of different wind speed and wind direction on the recirculation are qualitatively considered by applying the concept of the recirculation rate. The mechanism of occurrence of recirculation are presented and analyzed. It was found that when considering about the existing and normally operating power plants, the recirculation is more sensitive to wind direction and wind speed. Based on the above results, three improved measures increasing the wind-wall height and accelerating the rotational speed of the fans near the edge of the ACC platform and lengthen or widen the platform are developed to effectively reduce the recirculation.
Removal and Recovery of Silica Source from Geothermal Water Recycling System by Calcium Nitrate and Sodium Hydroxide
Authors: Bai Shu Qin , Yang Fan , Wang Yuan , Wang Kai Hua
Published: June 2012

In order to elucidate the possibility of removal of silicic acid from geothermal water, the calcium nitrate and sodium hydroxide as removing agent was investigated under various conditions. The initial concentration of silicic acid in geothermal water was 412 ppm as Si. The concentration of silicic acid decreased rapidly when the removing agent was added. Precipitation reaction for silicic acid reached equilibrium within 30 minutes and was independent of pH. The removing rate of silicic acid increased with increasing the pH of solution. The high concentration of silicic acid in geothermal water was perfectly removed by addition of calcium nitrate with molar ratio of Ca/Si over 2.1 at pH12. XRD pattern showed that the component of precipitation was calcium silicate hydrate Ca2SiO4・nH2O (CSH).
Simulation and Analysis on Heat Transfer Performance of Oscillating Heat Pipe with Single and Double Passageway
Authors: E Jia Qiang , Zhu Rong Jia , Zuo Hong Yan , Long Yan Ping , Hu Xiao Feng
Published: June 2012

A relative full-scale numerical simulation has been conducted on oscillating heat pipe(OHP) with single passageway(S-OHP)and double passageway(D-OHP). Mathematical model for studying the influence on the heat transfer performance of the number of passageway was built, including turbulence model, volume of fluid model, continue surface force model, and heat and mass transfer model caused by phase change, and all of which were based on the consideration of gas-liquid interface, wall adhesion angle, surface tension and process of phase change. Results showed that, on the one hand, strong coherence of the initial gas-liquid distribution, as well as the flow phenomena during boiling stage, were found between S-OHP and D-OHP, on the other hand, the heat-transfer capability of the D-OHP is slightly higher than the S-OHP.
Simulation and Investigation on Exergy Destruction Distribution in Single-Phase Heated Surfaces of Boiler under Transient Conditions
Authors: Guo Xi Yan , Fu Peng , Xu Hui , Li Ai Juan
Published: June 2012

The aim is to describe the irreversibility of energy system under transient conditions more scientifically and to lay foundation for further energy saving under transient conditions. On the basis of the existing research, a model for exergy destruction in single-phase heated surfaces of boiler under transient conditions was established. Taking a 1913t/h-boiler as an example, exergy destructions in single-phase heated surfaces of the boiler and their distributions among processes were calculated respectively. The results were compared with those calculated by models under steady conditions. The analysis shows that exergy destruction in each heated surface under transient condition is still mainly related to the difference of temperature and transferred heat. Some error occurs when models for steady conditions are used for simulation of transient conditions. The main reason is that the heat stored in metal as well as the time rate of exergy is ignored.
Theoretical Gasification Index Model for Actual Fuel Gasified with Air and Air/Steam
Authors: Li Hong Tao , Li Bing Xi , Xu You Ning , Zhang Ya Ning , Wang Lei
Published: June 2012

Based on mass balance, energy balance and chemical equilibrium, a theoretical gasification index model for actual fuel gasified with air and air/steam was established considering the key reactions of ultimate compositions in the fuel. The model can be used to predict the gasification index, such as the syngas composition, the syngas calorific value, gasification efficiency and syngas yield. The theoretical gasification indexes of some coal and biomass were obtained by this model. The simulated results show that: For the actual fuel, the syngas calorific value for air gasification is lower than that for air/steam gasification, and the syngas calorific value from coal is lower than that from biomass, whereas the syngas yield from coal is higher than that from biomass.
Experimental Study on LPG Composite Fuel Used on Spark Ignition Engine
Authors: Xue Yun , Liu Wu Quan , Lu Xue Cheng
Published: June 2012

Through researching and comparing the combustion characteristics of various gaseous fuels, this paper, based on the characteristics of gaseous fuels, proposes a LPG+H2 composite fuel scheme with liquefied petroleum gas (LPG) as a clean alternative fuel and hydrogen (H2) as an additive fuel on LPG engine, and completes an initial experiment on the gaseous LPG+H2 composite fuel used on engine. It also explores how the air-fuel ratio, ignition timing and ignition energy of the gaseous fuel with three different levels of H2 content influence the dynamic properties and emission characteristics of the engine.