Applied Mechanics and Materials Vols. 405-408

Abstract: The article deals with the use of flat layered structure with the structure-based panels for building of houses, making extensions to family houses or apartment with a flat roof. There are summarized the advantages and disadvantages of this structural system in comparison with other technologies of construction family houses and residential houses. The article is focused primarily on the suitability of the construction of self-help and the speed of construction.

Abstract: Flexible Graphite Composite (FGC) was prepared using flexible graphite as the basic material. The influence of the contents of binder and carbon fiber, and forming temperature and pressure was discussed on the mechanical properties. The experimental results showed that the optimum technologic conditions are binder A content 3%~10%, carbon fiber 0.5% ~1%, forming temperature 500°C~900°C, forming pressure 18MPa~25MPa. The density, tensile strength, compressive strength, and bending strength are optimal under these conditions.

Abstract: In this paper,the recovery fresh air heat pump units were used to heating in winter for a public building in the city of Jilin China,compared the original design of the engineering with the new design,analyzed the economy,energy saving and emission reduction of the new design scheme.The new design scheme can save standard coal consumption about 33.74 tons, operating cost saved about 28000 yuan, operation power less than the original scheme, it saved 83600 kWh and electricity 43900 million yuan.It reduced the pollutant emissions and saved the administrative costs. Using the new design scheme, system recovery period was 1.07 years.

Abstract: This paper uses the PHOENICS software to discusses a screen set mode's influence on the indoor mechanical ventilation, then calculated face wind speed, air temperature, air age and PMV. And analyzes the comparison of data, therefore concluded a reasonable way of setting screen in the office building.

Abstract: For the purpose of grid peak load shifting, chilled water storage has been paid more and more attentions to integrated with air-conditioning system. In this paper, a new air conditioning system with directly chilled water storage is given. With peak-valley Price, cost for power consumption can be saved 15%-20% by coordinated operation between chilled water storage system and air conditioning system. By sensitivity analysis of system economic performance on ratio of peak price to valley price, it is revealed that with much higher ratio of peak price to valley price, not only system economic performance can seldom be improved, but also chilled water storage is restricted for engineering utilization. This paper supplies theory reference for engineering application of chilled water storage technology.

Abstract: This paper does the simulation analysis of the annual energy consumption of an office building and the simulation of the whole GSHP(Ground Source Heat Pump) air conditioning system operation for two years. With the dynamic load, The simulation of the temperature field is done about the ground heat exchanger soil area with the radius of 2.5m during the heating period and the downtime. The result shows that soil temperature variation decreases gradually from the center to the distal end, in the first five days after shutdown, the soil temperature recovers faster, and then gradually becomes slowlier.

Abstract: Adding a compressor to basic in-counter-series triple-effect lithium bromide absorption refrigerating cycle is an effective solution to reduce the temperature of high pressure generator and slow down the corrosion situation. Exergy analysis based on thermodynamic analysis shows that the compressor placed between the low pressure generator and the condenser is the best, which help the system get the highest energy efficiency.

Abstract: To solve the technical problems existing in air purification, a multilevel air purification device was presented. And the new device is the combination of catalytic purifying technology of low-temperature plasma, nanoscaled titania and dual-band ultraviolet. For further studies on performance of the composite purification device, the device has been numerically simulated, through CFD simulation technology, by employing gas phase turbulence model, porous medium model and stochastic particle trajectory model. Contrast and analysis was made on velocity distribution, particle motion state and the pressure distribution of the internal flow field under different wind speed. The most appropriate wind speed could provide better centrifugal effect and less pressure loss. So some rules of velocity and pressure distribution in internal device were acquired.

Abstract: The paper mainly studied the gas forecasting in gas-consuming rush hour and long-term load forecasting.The paper analyzed the factors influencing the volume of gas forecasting in rush hour and forecast the volume of gas in rush hour using fuzzy method and RBF neural network. In long term city gas load forecasting, there are some characters such as longer time and uncertain demand increasing. A method is proposed to weakening the original data by using buffer operator before use GM(1,1)model. It indicated that the result acquired by these methods was satisfied with the requirement of engineering, and it was helpful to dispatchers.

Abstract: Direct reduced iron (DRI) shaft furnace flow field has important influence to the DRI production process, and the ventilation is a key factor for the velocity and pressure distribution of the gas flow in the furnace. At present works, the direct reducing gas velocity distribution and pressure distribution of DRI shaft furnace were studied with different ventilation. By the analysis of numerical simulation, the result was found that the direct reducing gas velocity increase with height in the shaft furnace reduction section. The velocity of the direct reducing gas augment with the increase of ventilation. The direct reducing gas pressure add with increasing height in the shaft furnace reduction section. With ventilation increasing, the pressure of the shaft furnace ventral part increase, and the pressure gradient increase in the direction of height in the DRI shaft furnace.