作者机构：
[Zhang H.; Wu Q.D.; Peng B.; Dong J.H.] Institute of Processing Technologies of Materials, Central South University of Forestry and Technology, Changsha, 410004, China
会议名称：
1st International Conference on Advanced Composites for Marine Engineering, ICACME 2013
作者机构：
[吴庆定; 张红; 彭博] Hunan Provincial Key Laboratory of Engineering Rheology, Institute of Processing Technologies of Materials, Central South University of Forestry & Technology, Changsha, 410004, China
通讯机构：
[Wu, Q.-D.] H;Hunan Provincial Key Laboratory of Engineering Rheology, China
摘要：
Two-dimensional numerical simulation of heat storage characteristics in a horizontal rectangular enclosure heated from below by natural convection has been investigated with the microencapsulated phase change material (PCM) slurry. Effects of PCM on heat storage and heat transfer are discussed, in which PCM slurry exhibits the pseudoplastic non-Newtonian fluid behavior and a peak value in the specific heat capacity with latent heat in phase temperature range. And their characteristics between the slurries with and without phase change of PCM are compared in the phase change temperature range. And vertical temperature distributions at the middle position are given. This paper shows streamlines and isotherms in the enclosure for phase change process.
期刊：
International Conference on Wavelet Analysis and Pattern Recognition,2012年:296-301 ISSN：2158-5695
通讯作者：
Liu, Y.-Y.(liuyy@csu.edu.cn)
作者机构：
[Shu-Xia Jiang] School of Traffic and Logistics, Central South University of Forestry and Technology, Changsha, China;[Hong Zhang] School of Mechanical and Electrical Engineering, Central South University of Forestry and Technology, Changsha, China;[Yuan-Yuan Liu] School of Mathematics and Statistics, Central South University, Changsha 410075, China;[Shu-Xia Jiang] School of Traffic and Transportation Engineering, Central South University, Changsha, China
会议名称：
2012 International Conference on Wavelet Analysis and Pattern Recognition
会议时间：
July 2012
会议地点：
Xi'an, China
会议论文集名称：
2012 International Conference on Wavelet Analysis and Pattern Recognition
摘要：
A novel signal processing method, called sensitive frequency band (SFB) selection, is proposed based on the correlation coefficients between the original signal and its reconstructed approximation and detail parts. By identifying the noised-related and fault-related SFBs, the SFB selection method can be used to reduce noise and extract fault feature effectively for a signal. This method is applied to analyze the engine injector-pulse-width waveforms, and it works well for engine waveform analysis and fault diagnosis. This study will also supply a good reference for signal processing in the other research fields.
摘要：
<jats:p>The microencapsulated phase change material (PCM) slurry is a kind of mixture with the PCM microcapsule particles and water. The actual PCM in the microcapsule is composed of several kinds of paraffin waxes (mainly nonadecane), and the membrane is a type of melamine resin. This study is focused on preparation, characterization, and thermal properties of the microencapsulated (PCM) slurry. The microencapsulated PCM particles are prepared by in-situ polymerization method. Four different levels of mass concentration <jats:italic>C<jats:sub>m</jats:sub></jats:italic> of the PCM will be used such as <jats:italic>C<jats:sub>m</jats:sub></jats:italic>=10%, 20%, 30% and 40%, respectively. The diameter of the particles is distributed in the range of 0µm~4.5µm, and most (61%) of them occur in the range of 0.5µm~1.5µm. The average volumetric diameter of the PCM microcapsule particle is about 0.78µm. And the average membrane thickness is about 11nm.Thermal properties of the microencapsulated PCM slurry are determined using differential scanning calorimeter (DSC). From DSC analysis, the melting and freezing temperatures and the latent heats of <jats:italic>C<jats:sub>m</jats:sub></jats:italic>=30% are measured as 38°C and 25°C, and 37.9 kJ/kg, respectively. The rheological properties are measured by a rotating cylinder type of rheometer, which the slurry shows the pseudo plastic non-Newtonian fluid behavior with the power-law fluid index <jats:italic>n</jats:italic>.</jats:p>
作者机构：
[Zhang, Yanlai; Zhang, Minglong; Zhang, Hong; Li, Lijun] Cent South Univ Forestry & Technol, Coll Mech & Elect Engn, Changsha 410004, Hunan, Peoples R China.;[Wang, Shuangfeng; Rao, Zhonghao] South China Univ Technol, Sch Chem & Chem Engn, Minist Educ, Key Lab Enhanced Heat Transfer & Energy con, Guangzhou 510640, Peoples R China.
通讯机构：
[Zhang, Yanlai] C;Cent South Univ Forestry & Technol, Coll Mech & Elect Engn, Changsha 410004, Hunan, Peoples R China.
会议名称：
2011 International Conference on Advanced Engineering Materials and Technology, AEMT 2011
会议时间：
29 July 2011 through 31 July 2011
会议地点：
Sanya, PEOPLES R CHINA
会议主办单位：
[Zhang, Yanlai;Zhang, Hong;Li, Lijun;Zhang, Minglong] Cent South Univ Forestry & Technol, Coll Mech & Elect Engn, Changsha 410004, Hunan, Peoples R China.^[Rao, Zhonghao;Wang, Shuangfeng] South China Univ Technol, Sch Chem & Chem Engn, Minist Educ, Key Lab Enhanced Heat Transfer & Energy con, Guangzhou 510640, Peoples R China.
会议论文集名称：
Advanced Materials Research
关键词：
Microcapsule slurry;Natural convection heat transfer;Phase change material (PCM);Solid phase state
摘要：
<jats:p>This experiment on natural convection heat transfer with the PCM microcapsule slurry for a solid phase state of the PCM were performed at a horizontal rectangular enclosure heating from below and cooling from top. In the present study, important parameters affecting the natural convection heat transfer of the slurry with the PCM were taken into account such as the mass concentration of the PCM microencapsulated into the slurry, the temperature difference between heating plate and cooling plate, the Rayleigh number <jats:italic>Ra</jats:italic> and the aspect ratio (width/height) of the horizontal rectangular enclosure. The heat transfer characteristics of the PCM microcapsule slurry on natural convection were concluded from predicted conditions simplified by classifying the temperature ranges into three sub-regions, in which the PCM in the slurry was in only solid phase state, phase change state or solid-liquid coexistence state and only liquid phase state of the PCM in the microcapsule, respectively. The upper cooling plate was fixed at a constant temperature in each region, and the lower heating plate temperature was varied by carefully adjusting the electric power input of an electric plate heater. And experiment was done under the thermal steady condition in the PCM microcapsule slurry. Emphasis was given on phase changing temperature range, and experiments had been performed for four kinds of enclosures with various heights.</jats:p>
会议名称：
International Conference on Green Power, Materials and Manufacturing Technology and Applications, GPMMTA2011
会议时间：
15 July 2011 through 18 July 2011
会议地点：
Chongqing, PEOPLES R CHINA
会议主办单位：
[Zhang, Yanlai;Zhang, Hong;Li, Lijun;Zhang, Minglong] Cent South Univ Forestry & Technol, Springer Coll Mech & Elect Engn, Changsha 410004 17, Hunan, Peoples R China.^[Rao, Zhonghao;Wang, Shuangfeng] South China Univ Technol, Minst Educ, Key Lab Enhanced Heat Transfer & energy Conservat, Guangzhou 510640, Guangdong, Peoples R China.
会议论文集名称：
Applied Mechanics and Materials
关键词：
Heat transfer coefficient;Microcapsule slurry;Nusselt number;Phase change material;Rayleigh number;Solid phase state
摘要：
A numerical investigation on natural convection heat transfer in a 2-dimensional enclosure heated from below has been conducted with mieroencapsulated phase change material (PCM) slurries. The microencapsulated PCM slurry exhibits pseudoplastic non-Newtonian fluid behavior and has a peak value in the specific heat capacity. The viscosity of the slurry is assumed to follow the Ostwald-de Wade power law fluid model with the power-law index n and the consistency coefficient K. Both dynamic and heat transfer characteristics arc discussed on Rayleigh-Benard natural convection. Characteristics on natural convection heat transfer have been numerically investigated for different value of the width-height aspect ratio of the enclosure. According to the comparison of the two kinds of fluid with PCM and without PCM, the start of natural convection is earlier for the fluid with PCM.
关键词：
Heat transfer;Phase change material;Thermal energy storage;Wood drying
摘要：
The article mainly discusses the application situation on the solar energy wood drying in China, and summarizes its advantages and problems in the real application. Because solar energy is low in thermal density, intermittent, and it is affected by weather, these have very big limitation to use solar energy in the actual production process. Based on these, it is introduced that the advantages of thermal energy storage technology in wood drying process of solar energy, the main application modes and the actual application status. It summarizes the major thermal energy storage materials and their basic characteristics, discusses the application prospect and the importance on the latent heat storage technology in wood drying.
期刊：
Applied Mechanics and Materials,2011年71-78:1187-1190 ISSN：1660-9336
通讯作者：
Zhang, Yanlai
作者机构：
[Zhang, Yanlai; Zhang, Minglong; Zhang, Hong; Li, Lijun] Cent South Univ Forestry & Technol, Coll Mech & Elect Engn, Changsha 410004, Hunan, Peoples R China.;[Zhang, Yanlai; Wang, Shuangfeng; Rao, Zhonghao] South China Univ Technol, Minist Educ, Sch Chem & Chem Engn, Key Lab Enhanced Heat Transfer & Energy Conservat, Guangzhou 510640, Peoples R China.
通讯机构：
[Zhang, Yanlai] C;Cent South Univ Forestry & Technol, Coll Mech & Elect Engn, Changsha 410004, Hunan, Peoples R China.
会议名称：
2011 International Conference on Green Building, Materials and Civil Engineering, GBMCE 2011
会议时间：
22 August 2011 through 23 August 2011
会议地点：
Shangri La, PEOPLES R CHINA
会议主办单位：
[Zhang, Yanlai;Zhang, Hong;Li, Lijun;Zhang, Minglong] Cent South Univ Forestry & Technol, Coll Mech & Elect Engn, Changsha 410004, Hunan, Peoples R China.^[Zhang, Yanlai;Rao, Zhonghao;Wang, Shuangfeng] South China Univ Technol, Minist Educ, Sch Chem & Chem Engn, Key Lab Enhanced Heat Transfer & Energy Conservat, Guangzhou 510640, Peoples R China.
会议论文集名称：
Applied Mechanics and Materials
关键词：
Heat transfer coefficient;Microcapsule slurry;Nusselt number;Phase change material;Rayleigh number;Solid phase state
摘要：
This experiment is performed to investigate heat transfer characteristics with the PCM microcapsule slurry in a solid phase state at a horizontal rectangular enclosure heating from below and cooling from top. Some important parameters are taken into account such as the mass concentration of the PCM, the temperature difference between heating plate and cooling plate, Nusselt number Nu, Rayleigh number Ra and the aspect ratio (width/height) of the horizontal rectangular enclosure. Experiment is done under the thermal steady condition in the PCM microcapsule slurry. Heat transfer coefficient is measured under various temperature differences in PCM mass concentrations of 10% and 20%. And relationship with Nusselt number Nu and Rayleigh number Ra is summarized to various heights H or the aspect ratio (width/height) Ar of enclosure.
关键词：
Numerical simulation;The linear air-conditioner compressor;The refrigerating performance;Varied operating condition
摘要：
This paper mainly introduces a novel linear air conditioner compressor which is driven by the linear oscillatory motor with two divided moving body, of which the Cylinder-piston assembly presents symmetrical distribution along the axial direction. The compressor dynamics equations were built and solved numerically with the fourth order Runge-Kutta method. in the meantime, this paper emphatically analyzes the influence of those factors, such as the intake pressure, the exhaust pressure, the suction gas superheat, the cooling degree, on the compressor performance at varied operating conditions. These works shows that improving the suction gas pressure and reducing the exhuast pressure can help to increase the refrigeration capacity and energy efficiency ratio of the air conditioner compressor. Those analysis results provide theory foundation for design,development, and engineering application of this linear air-conditioner compressor.
