Advanced Materials Research Vols. 374-377

Abstract: With the energy crisis,energy saving becomes a worldwide topic,Construction as the three major energy-consuming industries naturally become the focus of energy conservation. 95% of our existing buildings are high energy consumers, Therefore, the natural energy-saving building become the important work of building energy efficiency. In this paper, through the study of energy-saving status , China proposed a large number of problems about the introduction of EPC as an energy-saving mode in the process of emergence. And makes recommendations for the development of energy companies to adapt to the Chinese market better.

Abstract: The primary objective of this research was to evaluate the effectiveness of a magnetic ion exchange process (MIEX) in removing inorganic anions from municipal secondary effluent. Municipal secondary effluent drew from Gaobeidian wastewater treatment plant treating about 800,000 m3/day domestic wastewater. In the pilot experiment, MIEX resin removed 37.01% phosphorus, 31.62% nitrate, 36.06% ammonium and 64.34% sulphate from municipal secondary effluent. Phosphorus concentration in resin influent influenced reclaimed water treatment efficiency. Phosphorus removal rate was positively correlated with the concentration in influent. If phosphorus concentration in influent was >0.82mg/L, phosphorus removal of >52% was achieved. Nitrate and sulphate removal had same variation laws. 18.92% average removal rate of nitrate in middle period was lower than 35.06% and 39.25% average removal rates in earlier and latter periods respectively. The average removal rates of ammonium in three periods were 83.03%, 43.51% and 84.29% respectively. Removed ammonium of each sample was about 0.250mg/L, average removal rate was 36.06%. Lower ammonium concentration in influent could cause higher removal rate. Otherwise, magnetic ion exchange process could increase turbidity and could not disinfect, the resin effluent will be treated with coagulation-sedimentation and ozonation for groundwater recharge research with reclaimed water.

Abstract: According to the sloping roof engineering characteristics of multi-storied buildings, summarized from architectural design, structural design and other aspects, the roof forms, slope, structure, drainage organization, ventilation, lighting, lightning protection and other related issues were discussed in this paper. The common problems about changing the plane roof to the sloping roof in the old buildings, such as deal with the water tanks, inner courtyard and solar water heaters of the old buildings were also investigated in this paper. The design methods and ideas of dealing with the sloping roof series’ design problems were proposed. Some reasonable suggestions about structural analysis methods, key parts of the sloping roof, cornice and plinth were given as references for the future selection of sloping roof scheme, design and other aspects of treatment.

Abstract: At present, the use of sun-shading system in China has developed rapidly. Requirements and calculation methods for sun-shading system were proposed in the current thermal design code for civil building and the design standards for energy efficiency. But thermal performance of these structures is still lack of testing and evaluation methods. Based on relevant engineerings and researches results from domestic and international, this paper has proposed test method for measuring the SHGC of sun-shading system using calibrated hot box. This paper has established a good foundation for further research on evaluation method for sun-shading system.

Abstract: With the accelerated development of urbanization human’s activities are playing an increasing negative impact on ecological security of atmospheric environment especially for urban movement. In order to manage the statement of urban ecological security of air environment as well as its spatial and temporal trends, several measures and methods for resolving the issues are provided in the paper. An assessment system is established with 19 factors and 4 sub-systems based on the atmospheric environment characteristics of Changde through adopting the Pressure-State-Danger-Response (P-S-D-R) model. For guaranteeing the reliability of results two methods are used to determine the weight. The final assessment results indicate that from 2005 to 2009 the composite index for ecological security of atmospheric environment in Changde lies between 0.27-0.87 and the overall trend of quality for ecological security improves gradually which turns to fluctuate between less and more secure and the security threat is not avoided.

Abstract: In this paper, CFD simulations of the wind environment of four typical urban spaces in Shenzhen are introduced. The boundary conditions for these numerical experiments and the criteria of assessment are chosen according to the geographical and meteorological characteristics of the city. The effects of different building configurations on air ventilation are discussed, which may probably give some useful information to urban planners when more comfortable and healthier spaces are expected.

Abstract: A commercial zeolite pellet is formed by binding large numbers of small crystals with microporous material. Its Micro-structure has great affects on the gas adsorption process. In this paper, the physical and mathematic models of the adsorption process for a single pellet are established. The N2 adsorption properties in a 5A zeolite pellet are studied. Very detailed results of intra-pellet adsorption process are obtained. The impacts of crystal size, pellet porosity, diffusion coefficient of the binding materials and crystals on the adsorption rate are studied.

Abstract: In this paper we contrast the velocity fields of uniform and non-uniform porous filter media in folding-type air filters under different porosity conditions by numerical simulation. In addition, the non-uniformity of those velocity fields are measured and calculated. The results show that the non-uniformity of air flow velocity is related to pressure drop, and regarding the media whose porosity is above 95% (Δ＞95%), an effective way to improve the velocity uniformity and reduce the pressure drop is to increase the porosity of filter media and make the media capture particles evenly.

Abstract: For comparing the difference between Salt ponding test and ASTMC1202 test, the same batch of specimens divided into two groups are tested, and the chloride ion diffusion coefficient was calculated with the corresponding theory. The results indicate that the concentration gradient is larger, the concentration decreased faster and the slope of figure is more steep in salt ponding test, and the chloride ion diffusion is deeper for the role of the electric field in ASTM test. Although the diffusion mechanism is different in two kinds of test, there is little difference between the two groups of test diffusion coefficient.

Abstract: This paper demonstrated a new approach to the utilization of steel slag and provided a pattern for steel slag ceramic synthesis. Based on previous research on steel slag (converter slag) applied as raw material of ceramic and directed at content of steel slag CaO-MgO-Al₂O₃(5wt%)-SiO₂ system phase diagram was utilized in steel slag ceramic formula designing and augite region was selected. Bending strength of sample could reach 62.26MPa which was higher than national standard. When the content of steel slag was 40wt%, the steel slag ceramic would perform rather high bending strength. Through XRD patterns demonstrated the dominated crystal phases of all ceramic samples were pyroxene group crystals, akermanite existed in some samples also. But bending strengths of ceramics containing akermanite were lower than of samples containing pyroxene purely. Hence, diopside could be considered as the factor of improving ceramic bending strength.