Advanced Materials Research Vols. 250-253

Abstract: For particular commercial kitchen, using CFD software to build model according to the actual operation condition uttermost, adopting the exhaust system of up-suction hood, the effect of exhaust airflow rate on working temperature,velocity,CO₂ concentration at main site in commercial kitchen is studied. According to the common four calculation methods of airflow rate of exhaust hood, the simulation results shows 4.81 m³/s of exhaust system can realize eliminating harmful gas quickly and effectively, IAQ is good relatively. Based on of it, additional airflow rate can not improve emissions effect and operating conditions obviously, whereas it can be detrimental to save energy. The simulation results help design exhaust system.

Abstract: With the advent of urban construction upsurge, the construction of urban design in the city is playing an increasingly important role. Beauty is the goal of urban design, rapid development in modern cities today, what of aesthetic value the urban design should follow as principle and guidance has become a hot topic.Taking Nanjing and Beijing the two cities as the main research objects, based on typical urban design cases in two cities’ modernization development process, so as to analyze modern urban design aesthetic value orientation. Through the research, it can help people not only gain more in-depth and comprehensive understanding of China's most attractive cities, but also improve the modern urban design aesthetic expectation, more conducive to promote China's city construction and development.

Abstract: This paper introduces the methodology and procedures of identification of overall coefficient of heat transfer (U-factor) of building envelopes using recursive least squares algorithm and dynamic heat transfer data. Application this method to three types of typical to examine the correctness and feasibility of this method. The following conclusions can be obtained: 1) Identification of U-factor of building envelopes using recursive least squares algorithm is feasible for engineering purpose, the identified U-factor can be near to its real value; 2)The testing periods can be much shorter than the steady testing; 3)The identification error is associated with the thermal inertia. The error is larger as the thermal inertia of building envelope is large within the same testing circumstances.

Abstract: The flow characterizations through periodical variable cross-section passage are performed by numerical simulations in the one wavelength passage with periodic inlet and outlet boundary conditions. The flow patterns through the transient method in the passage show the steady characteristic at low Reynolds number, and the unsteady characteristics include either occurrence or development of self-sustained oscillations as the increasing of Reynolds number. As a consequence of these flow characteristics, the fluid mixing between the core flow and vortexes in trough or crest in channel can be improved to increase the heat transfer.

Abstract: In this paper, the coupling magnetic field model which the power magnetic pump generated by interference between the rotation and levitation force is linear inverse system decoupling, and study pseudo-derivative feedback control strategy on decoupling linearization system. According to the performance analysis and simulation of pseudo-derivative feedback control system, it can be concluded that pseudo-derivative feedback control system has quick response, high control precision, good control ability, and excellent robustness. It doesn’t ask the controlled object for a exact math model. Little warp will not influence system performance. It can be applied to project system.

Abstract: This paper begins with an introduction of two existing methods of prioritizing sensor locations, effective independence (EI) method and damage sensitivity (DS) method, followed by a new method (DRS) based on the harmony between damage identifiability and modal observability. For the comparison of these methods, the difference and relationship between these Fisher information matrixes (FIMs) is examined by a quasi-analytical mode. In addtion, this approach discusses the adaptability of the three methods. Numerical example indicates the limitation of EI method and DS method, and DRS method effectively avoids the contradiction between the two different optimization criterions. Finally, utilizing the result of the optical sensor locations, the results of structural damage detection by DRS method are much more accurate comparing with the other two methods on the whole.This template explains and demonstrates how to prepare your camera-ready paper for Trans Tech Publications. The best is to read these instructions and follow the outline of this text.

Abstract: In order to improve the stiffness and reduce the cost, the stiffness analysis of the flat vierendeel structure was taken in to account with the analytical method and FEM. The structural main geometrical parameters’ influences on stiffness were studied, such as the height of the structure and the area of the upper and lower chords. The study showed that there was a most reasonable height for any flat vierendeel structure, which could make the stiffness best and the deformation least, and the formula for the reasonable height was deduced. Furthermore the area of the chord’s influence on the most reasonable height was discussed. At last, case study by FEM proved the validity of the proposed method, and several measurements for stiffness optimization were also put forward, which could be a reference for the design of relevant projects.

Abstract: Skyscrapers are playing a more and more important role in modern life and definitely more and more tall buildings will be built in the future. But at the same time they are facing more threats from terrorists, fire, earthquake and other unforeseeable factors than before. This paper presents the idea of providing a secondary evacuation system in tall buildings, as a supplement to the existing primary means of evacuation especially when they are damaged or unusable in an extreme event. It illustrates the design flaws inherent in high-rise buildings today and the inadequacy of their primary evacuation systems and introduces some new mechanisms currently used as a secondary evacuation system. The paper thus serves as an introduction to this area and produces some useful advice for increasing the safety of tall buildings.

Abstract: Saving energy along with reducing carbon emission is an unavoidable new trend in response to continual global warming. In Taiwan, the energy consumed by commercial buildings and residential houses accounts for about 18% of the total energy consumption with 31% consumed for HVAC (heating, ventilation, and air conditioning) to emit 21 millions of carbon dioxide annually. Hence, in this research, an integrated energy-saving system combining green architecture, recirculation and reuse of water resources, indoor plants to purify indoor air quality, and solar energy and hydrogen energy is proposed for providing HVAC and illumination. The research has accomplished the following: (1) roof-top plants will lower the indoor temperature during summer; (2) utilizing aquatic plants to purify the wastewater for recirculation and reuse will effectively remove BOD and COD from contaminated water; (3) indoor plants are effective in lowering loadings to air conditioners and energy consumption; (4) the solar air conditioner has excellent overall energy saving features; (5) the solar hydrogen generating system and reformed methanol system have been developed applied to develop a 100 W PEMFC (proton exchange membrane fuel cell); and (6) a portable plant cultivation system has been developed to enhance plant growth for removing indoor carbon dioxide so that the building needs not be ventilated much to maintain adequate indoor air quality.

Abstract: With the fast development of economy in China, some questions have come out gradually, and more and more obviously. For instance the energy in short supply, the water resource exhausted. I have made a simple analysis on the issue that some extant energy is wasted and the water resource wasted in the water supply and sewerage engineering in China, and have put forward some corresponding measures, such as full use of available municipal water supply network head, reasonable control of the flow of overpressure and decompression cost saving measures, promotion of the technology of water reuse and rainwater reuse and other measures. These measures can effectively reduce the energy and water waste in the water supply and sewerage engineering.