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Wang F.-H.,Xian Jiaotong University | Feng C.-C.,Xian Jiaotong University | Liang Y.,Shanghai Architectural Design and Research Institute Co. | Wang X.-K.,Xian Jiaotong University
Journal of Central South University of Technology (English Edition) | Year: 2012

Several parameter identification methods of thermal response test were evaluated through numerical and experimental study. A three-dimensional finite-volume numerical model was established under the assumption that the soil thermal conductivity had been known in the simulation of thermal response test. The thermal response curve was firstly obtained through numerical calculation. Then, the accuracy of the numerical model was verified with measured data obtained through a thermal response test. Based on the numerical and experimental thermal response curves, the thermal conductivity of the soil was calculated by different parameter identification methods. The calculated results were compared with the assumed value and then the accuracy of these methods was evaluated. Furthermore, the effects of test time, variable data quality, borehole radius, initial ground temperature, and heat injection rate were analyzed. The results show that the method based on cylinder-source model has a low precision and the identified thermal conductivity decreases with an increase in borehole radius. For parameter estimation, the measuring accuracy of the initial temperature of the deep ground soil has greater effect on identified thermal conductivity. © Central South University Press and Springer-Verlag Berlin Heidelberg 2012. Source


Shi J.,Tongji University | Zhu M.,Tongji University | Chen H.,Shanghai Architectural Design and Research Institute Co. | Pan Y.,Tongji University | And 2 more authors.
Energy and Buildings | Year: 2013

With the development of urbanization in China, more and more high-rise residential buildings are constructed, mostly with 10-15 stories. Solar water heating system has been widely used in low-rise residential buildings in China, while its application in high-rise apartment is still in the initial stage. In this paper, the current application situation of solar water heating system in urban residential buildings of China is investigated. Additionally, demonstration projects of high-rise residential building are introduced, in which the application feasibility and limitation of solar water heating system are emphasized and some appropriate planning types of that are discussed. Finally, this paper analyzes the applicability of solar water heating systems integrated design in typical high-rise apartments from various aspects (such as architectural elevation, architectural plane and detailed construction) in the planning and designing phase. © 2012 Elsevier B.V. All rights reserved. Source


Xu C.,Nanjing Southeast University | Cao S.,Nanjing Southeast University | Fan S.,Shanghai Architectural Design and Research Institute Co. | Liu Q.,Nanjing Southeast University
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2014

Considering the factors such as the effects of acid rain, carbonization and external load and the interactions of concrete component's neutralization, an indoor rapid deterioration test scheme was designed and conducted. The neutral rules and the coupling effects of concrete components were studied by simulating acid rain erosion and fast carbonization of the concrete components without stress, with flexural stress and axial stress. Experimental results show that carbonization and acid rain coupling exists and the acid rain inhibits the carbonization to some extent. The coupling coefficient of acid rain and carbonization is less than 1. Effects of various factors on the neutralization of concrete from low to high are dS Source


Xu C.,Nanjing Southeast University | Cao S.,Nanjing Southeast University | Fan S.,Shanghai Architectural Design and Research Institute Co. | Liu Q.,Nanjing Southeast University
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | Year: 2014

On the basis of the diffusion theory and laboratory tests, the factors such as carbonization, acid rain, stress and their coupling effects on the neutral depth of the concrete component were studied. Through theoretical research, numerical simulation and regression analysis of experimental data, a concrete neutralization depth unified prediction model was established. The research results show that coupling of carbonization and acid rain exists; acid rain inhibits the carbonization to some extent; the coupling coefficient of acid rain and carbonization is less than 1. No matter acid rain, carbonization or their coupling interaction, the carbonation depth value of concrete increases as erosion time increases. The neutral velocity is fast in the early stages and decreases with the passage of time. The neutral depth is directly proportional with the square root of time. The tensile stress can promote the neutralization of concrete, while the compressive stress inhibits it. The relationship between the stress and concrete carbonation depth value is approximating the linear. Finally, stress factors under different corrosion modes were fitted based on the experimental data. Source


Xu C.-F.,Nanjing Southeast University | Cao S.-Y.,Nanjing Southeast University | Fan S.-L.,Shanghai Architectural Design and Research Institute Co. | Liu Q.-W.,Nanjing Southeast University
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | Year: 2014

To provide reference for concrete structure durability study and life prediction, on the basis of the diffusion theory and finite element numerical simulation, the effects of factors such as carbonization, acid rain and stress, and their coupling effects on the material contents distributions, pH values and neutralization depths in the neutral zones of concrete components were studied. The results show that during the concrete neutralization process, CO2 concentration decreases approximately linearly in the complete carbonization zone, and nonlinearly in the partial carbonization zone, while the whole curve is exponentially distributed; H+ and SO4 2- concentration distributions are in nonlinear decline. The internal content of Ca(OH)2 and pH value are continuously changing and there exist partial neutralization zones; the stress, acid rain and carbonization have coupling affects; in the initial stage the acid rain corrosion can inhibit carbonization. Numerical simulation for concrete neutralization depth holds certain credibility. Source

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