Applied Mechanics and Materials Vols. 316-317

Abstract: This paper presents the numerical simulation of groundwater flow and the prediction of drainage in the No.5 mine of the Feng-feng coal mine area, using the data from a water invasion. First of all, we build a mathematical model of groundwater flow according to the hydrogeological conditions. Then, the model is verified by the water invasion data. The measured and simulated water level fit well during the model verification. At last, the mine drainage was predicted using the established model. The results indicated that the coal mining below -100m would result in a large amount of drainage and relative high cost.

Abstract: To solve the problem of an ambulance interior noise, a multi-input and single-output linear system model is established based on the partial coherence analysis method. In this model, vibration acceleration signals of panels are treated as input, sound pressure signals is treated as output. The relevant influence among the system inputs are ruled out and the partial coherence function value is considered as an indicator to estimate the panels’ acoustic contribution to the field point. On the basis of analysis, the structural modification with damping materials is performed on the panels with greater contribution. The results show that panels’ acoustic contribution can be analyzed by partial coherence analysis method effectively and structural modification with damping materials based on the method has significant effect on reducing the vehicle interior noise and decreasing additional mass.

Abstract: In this paper, with the aid of energy consumption simulation software DeST-h, the annual air conditioning energy consumption of a typical residential building in Guangzhou was simulated to study the impact of window-wall ratio on the energy consumption under two different operation modes: natural and mechanical. It was revealed that increasing of south window-wall ratio, building energy consumption is increased under all mechanical mode, but reduces under nature priority mode.

Abstract: In this paper, it reveals that the ventilation using patterns can do much to the energy consumption for air-conditioning. In the simulation, it models the person behavior with their action for regulating indoor thermal environment by opening the window for natural ventilation, and compares the influence by ventilation in different patterns to the air conditioning energy consumption. The results show that in the pattern priority for using the natural wind it is helpful for reducing the energy consumption.

Abstract: In the present work, the emulsion fuels from bio-oil heavy fraction and 0# diesel were prepared by mechanical and ultrasound emulsification technologies. The relationship between stable time of emulsions and HLB value of emulsifier was investigated. Results indicated that lower mechanical stirring speeds and lower ultrasonic amplitudes lead to longer stable time of bio-oil heavy fraction emulsions. The stable time of emulsions reduced as HLB values increasing, and it reached a maximal value of 14 minutes under a HLB value of 1.8. Zetasizer Nano S90 was adopted to measure the droplet distribution of emulsions. The major droplet size of emulsions was smaller than 90nm. Meanwhile, the droplet distribution curve of ultrasound emulsions was much complex than those of mechanical emulsions.

Abstract: A greenhouse heating mode was proposed in this paper in order to reduce energy consumption and increase the efficiency of heating system for greenhouse. Considering experimental greenhouse practical operating conditions and various environmental factors, a warm air heating system, with heat source of biomass boilers, end heat abstractor of fan coils, was designed and some winter heating experiments was conducted. With the CFD method, the modelling of thermal environment inside the greenhouse in winter night was realized, temperature variation and distribution was simulated by STAR-CCM+. The simulation results were compared with experimental temperatures at the key positions in the greenhouse, and indicated that temperature errors of the monitoring points were less than 2K, relative error less than 8%, calculated root-mean-square error was 0.47K. Thus the validity of proposed model was certified.

Abstract: This paper given an online flow measurement method of large diameter pipe and low-head. This method can be applied to measure circulating water flow of thermal power plant. The characteristics of method is that: the measuring device adapted the method to solve the problem of the online flow measurement of circulating water, and to provide the necessary operating parameters for optimal operation of the unit cold-end system.

Abstract: Italy, like several Mediterranean countries, holds a very large number of cultural artifacts that are often exhibited and saved inside museums. Museums are usually part of historical buildings that, not rarely, originally had a different intended use and that have been currently transformed in place for conservation and for exhibition of works of art. The use of historical buildings as museums leads to limitations in the management and distribution of exhibition space, in design and managing HVAC systems and in the achievement of targets relating to the continuous monitoring of the microclimate for people comfort and for preservation of works of art. Moreover, the costs of the operation and maintenance of the HVAC system for this particular type of confined environment are often very expensive and the proper optimization of the required operations plays a main role. In this paper, authors propose a new decision support tool for curators regarding the operation and maintenance management of HVAC systems in museums especially in the case of their belonging to cultural heritage buildings.

Abstract: On-board gaseous emissions from diesel passenger car fueled with alternative fuels on different road types were studied using an On Board System (OBS2200) manufactured by HORIBA. The on-board testing shows that CO emissions from the car fueled with testing fuels on urban arterial road is highest while lowest on river-bridge. The car fueled with n-butanol diesel exhausts less CO relatively while increases THC emission. The biodiesel and n-butanol diesel increase NOX emission from the car while CTL and GTL can help the car reduce NOX emission. On urban arterial road and sub-arterial road CO2 emission is normally high while low on suburban freeway and river-bridge

Abstract: A three-dimensional Urea-SCR catalytic converter model was simulated with the method of CFD coupled with chemical reaction dynamic in this paper. With the modeling of urea solution injection and spray, the urea spray angle was optimized to reduce the urea wallfilm on the pipe wall. The flow fields and component distributions of a full scale Urea-SCR catalyst system were obtained to analyze the flow and chemical reaction characteristic of SCR system. Finally, an SCR system with a simple blade SCR mixer was simulated, the results indicated that the mixer can accelerate the evaporation and thermolysis of urea solution, and improve reductant uniformity and NOx conversion efficiency of Urea-SCR system.