Applied Mechanics and Materials Vols. 121-126

Abstract: In Taiwan, AC systems in buildings with central air conditioning account for over 45% of the total electricity consumed. Inefficient and poorly designed AC systems in existing buildings waste considerable amounts of money and energy. Therefore, retrofitting AC systems has become a widely adopted strategy to save energy while maintaining a comfortable indoor thermal environment. This study analyzes the potential energy savings and payback period of retrofitting AC systems in public buildings. In addition to the required Building Energy Management System (BEMS), several measures are introduced to reduce energy consumption during retrofitting. The main measures include testing, adjusting, and balancing (TAB) of existing AC systems; replacing over-designed chillers with chillers with smaller capacity; installing frequency conversion in original systems, such that they become variable water volume (VWV) and variable air volume (VAV) systems; and utilizing CO2 concentration control and pre-cooling air systems. Based on analytical results, we conclude that AC system retrofitting can reduce total energy usage by 11.75%, while the average payback period for a retrofit project is 4.71 years, demonstrating that AC system retrofitting in Taiwan is economically sound.

Abstract: Based on the principle and specifications of Environmental Durability Test on automobile engine ECU, an open, intelligent and practical ECU durability testing system (EDTS) is designed. The system consisted of a simulation platform and a testing management software. The platform provided stimulating sensor signals and simulation loads, and an online automotive environment was built. The management software sent various instructions to set up the platform and read the ECU running status data. And this EDTS has been applied to test a kind of domestic automobile engine ECU．The experimental results shows that the mean time to failure (MTTF) of ECU samples was improved and the testing period was shortened greatly.

Abstract: To provide a more accurate prediction of building energy consumption, it is necessary to take into account the influence of the microclimate around a building establishing through the interaction with other buildings or the natural environment. This paper presents a method for the quantitative assessment of building performance under any given urban context by linking the urban microclimate model ENVI-met to the building energy simulation (BES) program EnergyPlus. The full microclimatic factors such as solar radiation, thermal radiation, outdoor air temperature, humidity, and wind speed have been considered in the proposed scheme. The method outlined in this paper could be useful for urban and building optimal design.

Abstract: Super Critical Water Oxidation is an innovative and high technology. This article discussed properties of Super Critical Water (SCW), the reaction mechanism, technological process, strength and weakness of Super Critical Water Oxidation (SCWO).The future of SCWO is also prospected.

Abstract: Coke combustion process, the constant proportion of the combustion air-fuel ratio control results in low combustion efficiency and fault-prone, difficult to adapt to changes in complex working conditions. Application of intelligent technology of case-based reasoning, fuzzy control, proposed for intelligent energy saving air-fuel ratio control method. Based on current trends in working conditions and combustion process in case of failure, predict the typical faults with case-based reasoning technology to the combustion process. On this basis, through case-based reasoning algorithm realize the real-time air-fuel ratio correction. Based on fuzzy-PID temperature cascade control we can obtain the appropriate flue gas flow and flue suction and realize the stability of the combustion process to achieve optimal control.

Abstract: Gob-side entry retaining is an advanced and green mining technology, which can avoid using pillar and island working face, reduce driving workload, alleviate the tension between extraction and driving, and achieve a Y-type ventilation. The coal mine in this research successfully reserved a 485m roadway in No.10302 fully mechanized coal face by employing wide lane driving, pre-driven roadway, pre-controlling immediate roof in the roadway, and gob-side entry retaining by walling up with multi-standard concrete block using break-joint vertical stacking technology. From doing so, the supporting effect is significant, the roadway is integrated and the stable wall is free of distortion or cracking. This research paves a new way for gob-side entry retaining of fully mechanized mining in China.

Abstract: the inking system is one of the important components of an offset printing machine and an inking system with good performances is the necessary condition for high quality printing. In this paper, the Reynolds equation for ink transfer was deducted on the basis of the elastohydrodynamic lubrication theory and the relation model between parameters of the roller, speed, pressure and ink thickness in gap of rollers was established by applying the Hertz contact theory, so as to obtain the minimum film thickness equation in gaps of rollers. The influences of roller speed, pressure and size on ink thickness in gaps of rollers were analyzed. In addition, the ink transfer model was modified under the condition of considering retention of ink in gaps of rollers by using Roland700 as the object and the influences of printing speed on inking characteristics were analyzed by applying the method of computer simulation. The results showed that the longer was the inking stabilization time of the system was, the higher the printing speed was.

Abstract: Proton exchange membrane fuel cells have been receiving more and more attention these recent years. It is expected to improve the output power of the fuel cell, so it is important to understand what are the relevant factors affecting the output power. Simulation can provide valuable insight and guidance for design, performance optimization, and cost reduction of fuel cells. Some factors which affect the generated output of proton exchange membrane fuel cell are study in this paper, and simulation results are shown and analyzed. It helps to understand the mechanism of the fuel cell and lay a good foundation for improving the output power.

Abstract: Because of mine production, the open-pit enission of coal gangue solid waste and surface subsidence are one of important causes to failure the mining area land and environment, so the key technology, processes and equipment of filling mining to replace coal have been developed, which convergences the existing system of mining technology, And the stability theory of the control of filling mining rock movement and the method of surface subsidence prediction have been established, which provides a scientific basis for equipment Selection and the design of subsidence control; the key technologies of filling mining to replace coal is successfully applicated, which significantly improves the recovery rate of coal resources in China and constructs the new coordinated development model that is combined by the underground disposal of coal waste, mining subsidence control and the “under three”safe coal mining, through the above, the target of green mining and the coordinated development of mining social, economic and environmental will be achieved.

Abstract: Aimed to ground source heat pump’s low coefficient of performance in severe cold climate areas, solar assisted GSHP system with seasonal soil heat storage has been advanced. Simulation analysis was done for the underground heat exchanger using finite element method. Changing types of soil and material of U-tube, suitable kind of soil and material of U-tube were found for GSHP system. The analysis result shows that seasonal soil storage can solve the problem of large heat load in heating period and little cold load in cooling period for severe cold areas. It provides theoretical basis for residential use.