Dr. SOLI NESSRINE
University of Gabès, Tunisia
Title: Study of Munters-Platen cycle with Propylene as a refrigerant
Abstract：The human tendency consists in seeking a greater material comfort continuously and the field of the production of cold does not escape the rule. This tendency is evolved quickly, which requires more energy, therefore more terrestrial warming and climate change. Research again non-harmful refrigerant for the environment becomes more and more of a major importance.We proposes in this work the study of the operation of a refrigerating machine with absorption-diffusion with the mixture of hydrocarbons. It is about a refrigerating machine of low power (300 W) functioning on a level of temperature of the generator lower than 150 °C (fossil energy or solar energy) and operative with non-harmful fluid for the environment. A mixture of hydrocarbons (propylene / nonane) was considered and compared .We used helium as inert gas. The total pressure of operation is about 17.5 bar. A modeling on a software of flowsheeting Aspen Plus and Aspen Hysys was made. The mixture of hydrocarbon (propylene/n-nonane) proposed is a rather promising refrigerant as for the technical advantages which they offer, such as the use potential of a source of heat at a temperature not exceeding 150 °C and of the performances closed to those functioning with the mixtures usual(NH3-H2O-H2).
Global primary energy consumption increased by 1% in 2016, and oil remained the world’s leading fuel, accounting for a third of global energy consumption. Transport sector is the major consumer of oil and the major contributor to air pollution. It has been reported that in 2016 in China automobiles produced 44.725 MTs of emission pollutants, including 34.193 MTs of CO emission, 4.22 MTs of HC emission, 5.778 MTs of NOx emission and 0.534 MT of PM emission. Diesel automobiles, most of which are heavy duty diesel vehicles in China, released more than 90% of PM emission in the total emissions from automobiles, with only 10.2% share of the automobile ownership. The Euro 6 emission standard restrained PM to 0.01 g/kWh and NOx to 0.4 g/kWh for heavy duty diesel engines. Oxygenated fuel additives have already been confirmed to effectively reduce the soot or PM emissions. Enhancing the entrainment of oxygen from the in-cylinder charge gas is another approach. Polyoxymethylene dimethyl ethers (PODE), with the structure of (n: 1~8) and with no bond, is a promising blend for diesel due to the low viscosities and pour points, low distillation temperatures, high oxygen contents and high cetane numbers. PODE has higher intramolecular oxygen content and higher volatility than diesel. PODE blending can effectively reduce the soot emissions of diesel automobiles, while increase the NOx emission a little. EGR (exhaust gas recirculation) and SCR (Selective catalyst reduction) can balance the high NOx emission derived from PODE blending.
A.Prof. Baoping Cai（蔡宝平副教授）
China University of Petroleum, China
Title: Development of Subsea Systems for Offshore Oil and Gas Equipment
Abstract：We developed a high-reliability control system for 3000 m subsea blowout preventer stack for China National Offshore Oil Corp., and proposed a series reliability evaluation approaches for subsea equipment. We are working on Bayesian-network-based fault detection and diagnosis methodology and has developed two diagnosis systems for subsea blowout preventer and subsea Christmas tree system.
A. Prof. Samuel Simon Araya
Aalborg University, Denmark
Title: fuel cell diagnostics by means of electrochemical impedance spectroscopy
Abstract：As fuel cells improve in durability and are slowly deployed for various applications, their reliability and availably becomes of paramount importance to guarantee the desired power output whenever it is needed. Different faults can occur within the fuel cell system due to changes in operating conditions, and a continuous monitoring of its state of health along with a robust diagnostics system can be used to identify and isolate these faults before system failure happens. This presentation will focus on the use of electrochemical impedance spectroscopy for online fuel cell health monitoring and diagnostics.
Xi'an Jiaotong University,China
Title: Energy efficient indirect evaporative pre-cooled air conditioning system in humid tropical climate
Abstract：Evaporative cooling system is an environmentally-friendly and energy saving technology for air conditioning. However, in hot and humid climates, it is rather inefficient due to the high wet bulb temperature of the ambientair. In order to take advantage of indirect evaporative cooling (IEC) system in humid tropical climates, we present a hybrid system that combines IEC system and vapor compression system. The indirect evaporative heat exchanger is employed to pre-cool the ambient humid air before passing through the vapor compression system. A computational model has been developed for the evaporative pre-cooling process. Results have indicated that the humid outdoor fresh air can be pre-cooled to a temperature below its dew point temperature when the wet bulb temperature of the exhaust air is lower than the dew point temperature of the outdoor air. In addition, the use of IEC reduces the cooling load of the vapor compression system, as a result, the hybrid system has a large potential to reduce electricity demand and energy consumption
Title: Analysis on Simulated Test of Large-scale Efficient Roto-screen Separator
Abstract：With the help of the software EDEM, this paper analyzes the influence of kinematic parameters of large-scale efficient roto-screen separator on the average advance speed of the materials and the screening efficiency through simulation experiment. The results showed that the influence levels of the kinematic parameters are: turning radius > rotation speed > screen leaning angle; to achieve better screening effect, the turning radius, rotation speed and screen leaning angle should be set as 20mm, 450r/min and 6°~8°.
Title: Determination and Performance Analysis on Miniature and Electric Commercial Vehicle Frames of Carbon Fiber Materials in the Laying Mode
Abstract：The concept three-dimensional model of the mini commercial vehicle was established, and the vehicle parameters and calculation conditions were defined. The stress direction and value of the beam were calculated by Ansys workbench, and the laying method of the carbon fiber material of the beam was determined to be [0°\90°\ 45°\90°\0°] of the five-layer layup sequence, using the Abaqus software analyzes the frame made of carbon fiber composite material. It is found that the degree of Hill failure is 23.88% on the beam 3 under the working condition 1, and the damage of the beam 4 is 33.92% under the working condition 4, and the damage degree is less than 100%. The modal analysis results of the whole frame show that torsional mode and bending mode frequency of the first-order are 51.741 Hz and 62.286 Hz, exceeding 48% and 58% of the target value, respectively, which meet the target requirements. Carbon fiber materials provide an important basis for the application of miniature commercial vehicle frames.
Title: Experimental Research on Transient Electromagnetic Logging Method in Cased Holes
Abstract：Due to the strong shielding effect of steel casing and the limited space in cased hole, it is difficult to identify the formation resistivity distribution. Based on previous studies, a prototype transient electromagnetic logging tool and a cased hole model have been designed and built, feasibility experimental study in cased hole model was conducted by researching the responses received by the receivers with long source-receiver offset, some experimental achievements on transient electromagnetic logging in cased hole are presented. In the experimental research, three sets of experiments were conducted to study the characteristics of the measured responses with the changing of the vertical source-receiver offset, water level and water conductivity outside the casing. The experimental results indicates that: 1) the response inside the casing is strongly sensitive to the change of the source-receiver offset, both in amplitude and phase, so it’s hard to obtain useful information from the responses received at different source-receiver offset; and 2) the response difference curves, which are obtained from the responses measured by the same receivers, especially the ones with longer source-receiver offset, are sensitive to the change of the water level outside the metal casing during the water-injection process and the water conductivity during the salt-adding process. The results indicate that long source-receiver offset transient electromagnetic logging tool could be used to map formation conductivity outside the metal casing and further provide guidance for actual production in designing long source-receiver offset transient electromagnetic tools in numerous similar applications.
Title: Modified color for VO2/Au/VO2 sandwich structure-based smart windows
Abstract：VO2/Au/VO2 sandwiched structure was fabricated by rapid thermal annealing of sputtered V/Au/V sandwiched structure to modify the intrinsic unpleasant brown–yellow color of VO2 films based on the localized surface plasmon resonance (LSPR) for smart windows. The morphology, crystalline structures, and optical transmittance spectra of the sandwich structure were characterized by sanning electron microscopy, X-ray diffraction and UV-VIS-NIR spectrophotometry, respectively. The obtained results indicate that the VO2/Au/VO2 sandwich structure with different Au nanoparticles sizes shows different color from brown–yellow to blue–green due to the appearance and redshift of LSPR peak. Moreover, the phase-transition temperature for the optimized VO2/Au/VO2 sandwich structure was only 42.5 °C, far below 68 °C for bulky VO2. The optimized VO2/Au/VO2 thin films could simultaneously meet the requirements of comfortable color and a reduced phase-transition temperature, and these excellent features would benefit the practical application of VO2 thin film-based smart windows.