Jun Li

Thermal Storage Technology on Solar Energy Wood Drying in China

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.

Characterization and Thermal Properties of the Microencapsulated PCM Slurry

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 Cm of the PCM will be used such as Cm=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 Cm=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 n.

Mouse Deformation Design Based on CAE

For obtaining good quality plastic product of mouse,the solid sample of mouse was built, the top and down cover deformation of mouse were drawn as well,further more,the mouse assembly was also selected.Up and down cover of mouse moulds and the whole style mold were gotten by Pro/E,gate location of mouse up cover was analyzed,the project and net model were created,thus the joint of gate location area centre could be found,the pouring system location was set and optimized.

Agriculture Auto Workpiece Injection Mold Design Based on CAE

For reducing the mold manufacturing time as soon as possible, CAE technology is used to build work-piece three-dimensional draw, parting surface, gating system is designed, the mold’s moving process being simulated, especially liquid flowing system is emulated. If the parameters are set reasonable, the ideal mold can be made. Keywords:Injection mold; parting surface; gating system; liquid flowing system analysis.

Heat Transfer Characteristics of the Phase Change Material Microcapsule Slurry in Solid Phase State

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.

Numerical Simulation of Natural Convection Heat Transfer on Microencapsulated PCM Slurries

A numerical investigation on natural convection heat transfer in a 2-dimensional enclosure heated from below has been conducted with microencapsulated 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 Waele power law fluid model with the power-law index n and the consistency coefficient K. Both dynamic and heat transfer characteristics are discussed on Rayleigh-Bénard 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.

Natural Convection Heat Transfer of the PCM Microcapsule Slurry for a Solid Phase State in a Horizontal Rectangular Enclosure

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 Ra 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.

Study of Lost Foam Casting of Reaper Underpan

For obtaining higher quality casting, the lost foam casting is used to produce reaper underpan. While the raw materials are selected, the fireproof coating and sand are chosen well, the sand box is designed according to the technology, pouring system is calculated, under the above operation strictly, such as air hole can be avoided.

Punch Die of 385 Diesel Part Design Based on CAE Technology

For getting the higher quality,the paper analyses the punching order according to the part shape,then determines the die styles.The dies include blanking and bending steps,the bending dies are choosed carefully,from the part to its’extension size,then to cavity size and punch size,thus the general assembly drawing is tested whether it is right.

Engine Oil-dish Dies Design Based on CAE

For getting higher quality product and reducing cost, the article studies the CAE technology used in dies’ design, CAE will help to determine the flattened workpiece size, through workpiece igs file input, grids devided, concrete parameters set, workblank and drawing ribs created, drawing ribs load set, the workpiece produced process will be simulated, the final frame can be watched.while all are well designed, the qualified dies can be obtained.