Applied Mechanics and Materials Vols. 448-453

Abstract: This paper studies the insulation properties of masonry filling paraffin composite phase change material. With high density polyethylene (HDPE) as wrapping materials and solid-liquid mixing paraffin as phase change materials, solid-liquid mixed paraffin phase change material with different amount of admixture is prepared, and the problem of flowing after paraffin phase change is then solved. The phase change temperature and the phase change latent heat of composite phase change material with different amount of admixture are tested. The results showed that the composite material with 30% of 52 # solid paraffin, 70% of liquid paraffin, 70% of HDPE coating performs best as to the phase transition temperature and latent heat. On this basis, This paper studies the composite phase change wall with phase change materials 0%, 33%, 66% and100%. Results show that the composite phase change material wall’s heat preservation performance has significantly improved. the temperature fluctuation range of internal and external wall surface is 4.2 °C lower than unfilled wall.

Abstract: Energy-saving and environmental protection has become the theme of the 21st century. Greenhouse is an energy-intensive industries. Every year, 35% of energy consumption on agricultural production is used for greenhouse heating in the world, which accounts for 15-40% of the cost of greenhouse production. For improving energy efficiency and protecting the environment, the reasonable control of greenhouse environmental parameters is significant. The design of solar greenhouse real-time environment monitoring and automatic control system is based on 8051 single-chip in the thesis. The temperature and humidity signal are obtained from DS18B20 digital temperature sensor and IH3605 humidity sensor. When the greenhouse temperature exceeds the set temperature, the device can be started by perform timely processing, then the user can read LED digital display temperature and humidity values.

Abstract: Using orthogonal design method of four factors and three levels, make a mix ratio experiment on sleeper concrete of China's railway sleepers, used steam curing concrete early compressive strength (stripping strength) as evaluation index. Study on different experimental factors of water-cement ratio, sand ratio, fly ash and admixture differently influenced on the early strength of sleeper concrete and analyze the difference impact of each factor and level for the orthogonal experiment. The result shows that the admixture is the main factor for early strength of concrete, followed by fly ash, water-cement ratio and sand ratio. It can provide technical guidance for railway sleeper field and has practical value.

Abstract: In the era of increasingly accelerating globalization context, traditional culture was faced with enormous challenges and new development opportunities, how to inherit and carry forward the fine traditions of the national architectural culture, is one problem that many architects thinking about. This paper attempted to apply the ecological experience of traditional residences as the breakthrough, according to the ecological construction experience of Chinese traditional residences, detailed analyze the siting and groups construction, space and form construction, materials and details construction etc. and other aspects of ecological construction features and design laws, hoped to raise the level of architectural design to improve the ecological problem about high energy consumption.

Abstract: Ignoring the coordinated development and the natural environment carrying capacity plight caught the traditional development model, emphasizing the natural environment and the economy to adapt to the pursuit of harmony between man and nature, sustainable development become a wise choice, eco-design of the built environment is a human realization important tool for sustainable development. Sustainable eco-design of the built environment and the long-term goal of the current interests combine to maintain maximum coordination with the natural environment, not only become the reality of human needs, while also considering the needs of the human potential. Ecological construction and environmental protection around the significance of in-depth discussion of the needle eco-building for sustainable development thinking and practice of environmental design, environmental design proposed ecological architecture reflects the theme of sustainable development, while recycling is designed to achieve low carbon, environmentally friendly eco-building environment design approach.

Abstract: Warm Mix Asphalt (WMA) technology has become increasingly popular in pavement construction because of its environmental benefits and its fine engineering properties. In order to optimize mixing performance of WMA, four kinds of warm mix additives used in China were evulated by viscosity testing. Thus, this paper is mainly to reduce bitumen viscosity, which in turn improves mix workability, produces fewer emissions, and generally creates better working conditions. Results identified that the Sasobit additive has a large viscosity reduction and has a fine workability, and is appropriate for pavement construction.

Abstract: The procedure and system of drum drying technology are introduced for lignite drying and upgrading with high temperature flue gas. The total moisture and inherent moisture of lignite decrease significantly after being dried and the lower heat value (LHV) increases greatly, which means that the quality of lignite is improved obviously. Both the moisture and air dried volatile of the dried product coal decrease gradually when increasing the drum inlet temperature. However, only the moisture decreases and the volatile varies little when increasing the drum outlet temperature.The rotating speed of drum will make a few impact on the drying degree. Because the combustion load and the drying output will affect each other, it is recommended that the independent pulverized coal system is added. The key factors affecting the system material balance are the ratio of fine-grained powder and lower heat value. The appropriate ratio of fine-grained powder is suggested. The inert atmosphere feeding system which can control the oxygen content independently must be designed.

Abstract: A pilot-scale combined system composed of anaerobic digenstion, membrane bioreactor (MBR) and Electro-Catalyzed oxidation processes has been set up to treat the leachate from municipal solid waste (MSW) transfer station. System performance was evaluated by ammonia and chemical oxidation demand (COD) removal . Results showed that 97% of ammonia was removed by MBR, and the elimination of COD was mainly completed in anaerobic process and MBR with a total removal of 99%. In addition, the analysis of microbial communities in the MBR, carried out by clone library and denaturing gradient gel electrophoresis (DGGE) of the 16S rRNA genes, indicated a highly diverse bacterial community and the enrichment of N-cycling bacteria.

Abstract: In this paper, the authors analyzed effects of the factors, such as the air mass flow rate, the geometric dimensioning of the inner and outer combustion tubes and the thickness of the radiator, to the performance of the combustion-end radiator system. The result shows that optimal performance will be achieved when the combustion power is 1kW and the air mass flow rate is 5 times higher than the requirement for the complete combustion of CH₄. On this basis, the effect of the geometric dimensioning to the combustion-radiator system is discussed. The performance of the combustion-radiator system is the best when the inner diameter of inner tube is 24mm, the length of the combustion tube is 40mm and the radiator thickness is 1mm. In this condition, the average temperature of the radiant surface, the radiant power density of the radiator and the combustion efficiency are 1530K, 9.41W/cm² and 47.3%, respectively.

Abstract: Under the effect of geologic hazard, soil horizon under gas pipeline tends to subside or runoff, which may result in pipeline hanging in the air with uneven distribution of stress and consequently lead to pipe failure. In view of pipeline suspension resulted from geologic hazard and taking pipeline XX as example, software CAESAR II is used to analyze the stress of suspended pipelines with different length combined with practical and existing analysis calculation model. The critical length of suspended pipeline is obtained on the basis of the software analysis. The results with certain engineering value can provide reliable theoretical basis for practical engineering.