Applied Mechanics and Materials Vols. 256-259

Abstract: An experimental model for electronic chip cooling was designed to investigate the cooling performances of an air-cooled thermoelectric cooler (TEC). The effect on the cold side temperature was experimented on the variation of heat emission intensity of TEC hot side and operating current. It was found that the mean temperature of the TEC cold side will decrease with enhanced the fan power, and the cooling performance would be better. The cold side temperature of TEC appeared a low valley with operating current variation. Optimizing the heat emission and the operating current properly is necessary to make the TEC work at perfect cooling performance.

Abstract: In recent years, the cold application of radiation technology air-conditioning system more and more, have achieved good operating results. this article discusses the radiation cooling and air conditioning system of the basic principles of design points, radiation cooling air conditioning system is proposed comparative analysis of market feasibility, proved the cold radiation from the air conditioning system to improve energy efficiency and comfort of the tremendous use of space. Hope to further promote the class and application of air conditioning to provide a useful reference.

Abstract: Air-conditioning and ventilation system which control temperature and humidity was designed in this paper. Its aim was to ensure the production process and meet the comfort requirements of workers. Considering that web press equipment load account for large proportion of the total load, we separated out the area of web press and the waste heat was discharged by ventilation system. We adopted Stratified air conditioning on the remaining area because the whole workshop is large space. By means of calculation, energy saving rate of stratified air conditioning system is 25.6% and the refrigerating capacity is reduced by this way of design. Energy-saving effect is remarkable. So it’s a good method to energy conservation.

Abstract: With the improvement of the living standard of the people and the limit of the electric power supply, the shortage problem of the electric power are more and more serious in large cities. There are many factors affecting the requirement of urban electric power supply such as urban population, the structure and the scale of economic, the he weather conditions, etc. Based on the actual data of Beijing from 2008 year to 2009 year, we quantitatively analyze the relationship of temperature and electric load with regression analysis method. The result can provide the changing rules of the electric load with temperature and give some suggestions on improving urban electric power supply.

Abstract: In this study, the oxygen contents of the indoor air quality in different climatic conditions in a chamber were real-time monitored. At the same time, ten young volunteers sit in the three different environment conditions to fill subject feeling questionnaires. The climatic conditions referred to three groups of hot and humid environment (30°C, 35°C, 40°Cdry bulb temperature and 90% relative humidity). The results reveal the oxygen content of indoor air quality slightly decreased in different thermal environments, the values within normal variations. Questionnaire statistic results indicate that the temperature and humidity control in air conditioning significantly influence the human feelings. Thirsty, head heavy, tired, irritability, distraction, chest tightness and cold sweating are the main emerging symptoms in such indoor environments. Reasonable control of indoor temperature and humidity has vital importance to indoor environment quality.

Abstract: In China, the environmental impact from the construction of the distribution system is seldom discussed. In this study, the environmental impacts in production of district pipes are considered. The functional unit used in the study is production of one pipe unit. The studied pipes are: pipe of the dimension DN100, DN200 (Seamless steel tubes) and DN500 (spirally welded steel tubes) with specified length (12m). Based on the concept of the Distance-to-Target weighting method, the total environment load is given. The results can be used to identify environmental significant parts in the actual projects including once more parts of the district distribution system have been investigated with LCA methodology.

Abstract: In some areas like south of China, energy is used in part time of the 24 hours and part space of the buildings, that is the characteristics of intermittent and loculose energy use. The energy consumption of the air conditioner can be calculated from the transient state with the help of numerical computing method. Among different wall configurations of self-insulation, internal insulation and external insulation walls, it shows that self-insulation and internal insulation walls performs better than external insulation walls in energy saving. The energy stored by walls which account for the most part of the energy consumption can be sharply reduced in the configurations of self-insulation, internal insulation walls.

Abstract: In China, the environmental impact from the construction of the distribution system is seldom discussed. In this study, the environmental impact from construction of district pipes is considered. The purpose is to identify environmental significant parts in the construction of district pipes and to use the results in the actual projects including once more parts of the district distribution system have been investigated with LCA methodology.(Methods) Construction of district pipe networks according to the technical specification was studied. The total consumption of energy and materials was calculated based on budget norm for projects. The functional unit used in the study is construction of 100 metres of pipe system. The studied pipes are: pipe of the dimension DN100, DN200 (Seamless steel tubes) and DN500 (spirally welded steel tubes) .Urban environment surroundings were studied. A short description of the inventory, some inventory results and a life cycle impact assessment are presented. Based on the concept of the End-point damage weighting method, the total environment load is given.

Abstract: The prevention of geological disasters in the coal mine, integrated geophysical technology was used to avoid geological disasters in coal mine, build a harmonious society and improve economic efficiency is of great significance. In this paper the development of geophysical technology was analyzed, the correct use of geophysical technology and geological disaster prevention are described, It briefly introduced seismic exploration, electrical geophysical technology such as the basic concepts and exploration results and looked forward to the prospect of integrated geophysical technology .By exploration cases it described geophysical exploration methods in the prevention of geological disasters in the coal mine practicality and effectiveness.

Abstract: In this paper, the analysis is carried out under EL-centro wave with SAP2000, and the appraisal results on their anti-failure performances are presented based on the plastic-hinge theory. In the analyses, the geometric and material nonlinear effects are considered simultaneously. The plastic development level of the rods, the deformed shape and the failure type and the ductility are estimated. The results show that the failure model of the structure under the earthquake wave action is the complicated combination of strength failure and elasto-plastic dynamic local buckling in deferent areas of the structure; Its critical failure peak acceleration of EL earthquake wave when applied in X directions is 747gal, which is 1.87 times more than the official seismic fortification level of 8 degree (major earthquake, 0.4g) and can be served as earthquake victim shelter in the area of 8 degree seismic fortification; Its displacement ductility coefficient is12.14,which shows the structure owns good energy dissipation capacity.