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Wu J.,Tsinghua University | Wang G.-Q.,Tsinghua University | Wang G.-Q.,China Northwest Architecture Design and Research Institute Co. | Cao Z.-P.,Tsinghua University | And 4 more authors.
Huanjing Kexue/Environmental Science | Year: 2014

A pilot-scale experiment about the process of “thermal pretreatment at 70℃/thermophilic anaerobic digestion” of waste activated sludge of high solid content (8%-9%) was conducted. The process employed thermal treatment of 3 days to accelerate the hydrolysis and thermophilic digestion to enhance anaerobic reaction. Thus it was good at organic removal and stabilization. When the solid retention time (SRT) was longer than 20 days, the VSS removal rate was greater than 42.22% and it was linearly correlated to the SRT of the aerobic digestion with the R2 of 0.9153. It was suggested that SRT of anaerobic digestion was 25 days in practice. VSS removal rate and biogas production rate of the pilot experiment were similar to those of the run-well traditional full-scale sludge anaerobic digestion plants (solid content 3%-5%) and the plant of high solid content using German technique. Source

Wu J.,Xian University of Architecture and Technology | Bai G.-L.,Xian University of Architecture and Technology | Zhao H.-Y.,China Northwest Architecture Design and Research Institute Co. | Li X.,Xian University of Architecture and Technology
Construction and Building Materials | Year: 2015

Nowadays, energy dissipation of buildings has caused serious problems to the environment for leading to overuse of resources in China. To reduce energy consumption and protect the environment, shale that widely distributed in China and the waste, including both building waste and industrial waste are used as raw materials to manufacture fired hollow blocks with 29-row holes which ensure the insulation properties and reduction of weight. As samples, 365 mm × 248 mm × 249 mm rectangular fire hollow blocks with density of 850 kg/m3 were produced to study the mechanical and thermal properties of this wall material. The results satisfied the relevant Chinese Standard, and the block has a high compressive strength and reliable insulation performance comparing with fired common brick or other hollow blocks. Because of the excellent self-insulation characteristics, the blocks could be used directly as wall materials without requiring the usage of special insulation measures in masonry structures, which mean that this new-type material could reduce the cost of housing construction and had broad application prospect in masonry structures. Therefore, using this block could not only cut down the consumption of energy, but also could ease the pressure applied on the environment. © 2015 Elsevier Ltd. All rights reserved. Source

Li J.,Xian University of Technology | Liu Z.,China Northwest Architecture Design and Research Institute Co. | Li Q.-N.,Xian University of Technology | Li X.-J.,Shaanxi Architectural Design and Research Institute Co.
World Information on Earthquake Engineering | Year: 2014

The seismic performance of two types'assembled monolithic short column encased by steel plate hoop and jointed by bolt or bolt bar was separately contrasted to that of ordinary reinforced concrete short columns and reinforced concrete short columns cast in situ and equipped with high strength spiral hoop. The results show that the seismic performance of two types'assembled monolithic short column is superior to that of ordinary reinforced concrete and equivalent to that of reinforced concrete short column with high strength spiral hoop; The two types of node structure connection are safe enough and can be used to practical engineering. In addition, the two types of connecting methods were compared each other and the results suggest that the short column jointed by bolt with low shear span ratio has a better seismic performance. Source

Xie Q.,Xian University of Architecture and Technology | Xie Q.,South China University of Technology | Li P.,Xian University of Architecture and Technology | Ge H.,China Northwest Architecture Design and Research Institute Co. | And 2 more authors.
World Information on Earthquake Engineering | Year: 2015

The modern architecture built in traditional style is a good carrier of innovation and inheritance of local traditional architecture culture and is unlike general modern structures because of the different structural methods. In order to investigate the seismic behavior of RC column-beam joint built in traditional style, 4 specimens with scale of 1:1.5 were tested under low-cyclic reversed loading. Some different conditions were taken into account to analyze their influence on the seismic behaviour, including the parameter of volume-strip ratio, the spacing of beam. The behaviors of joint models, such as the failure mechanism, bearing capacity, hysteresis characteristics, energy dissipation capacity and so on were analyzed. The results indicates that, 3 small core zones (upper, middle and lower core zone) appear in the RC column-beam joint built in traditional style, during loading. The initial cracking occurs in the lower core, afterwards in the upper and middle cores. And X-shaped shearing crack appears in all the three cores when the joint destroyed ultimately, especially the destruction in lower core. With the increasing of volumetric stirrup ratio, the ultimate bearing capacity of the joint improves, and the hysteretic curves become plumper. With enlargement of the space between upper and lower beam, the ultimate bearing capacity of the joint basically unchanged, and the hysteretic curves become less plumper. Compared with normal RC column-beam joint, the displacement ductility factor and the energy dissipation coefficient during limit stage of RC column-double beam joint built in traditional style are smaller, and the the ductility and energy dissipation are worse. © 2015, Science Press. All right reserved. Source

Zhao M.,Xian Jiaotong University | Zhao M.,China Northwest Architecture Design and Research Institute Co. | Gu Z.L.,Xian Jiaotong University | Kang W.B.,Xian Jiaotong University | And 5 more authors.
Applied Energy | Year: 2016

Due to sustainable development, solar energy has drawn much attention and been widely applied in buildings. However, the application of solar energy is limited because of its instability, intermittency and low energy density in winter. In order to use low density and instable solar energy source for heating and improve the utilization efficiency of solar energy, a solar phase change thermal storage (SPCTS) heating system using a radiant-capillary-terminal (RCT) to effectively match the low temperature hot water, a phase change thermal storage (PCTS) to store and continuously utilize the solar energy, and an air source heat pump (ASHP) as an alternate energy, was proposed and set up in this research. Series of experiments were conducted to obtain the relation between the solar radiation utilization rate and the heating supply temperatures, and to evaluate the performance of the RCT module and the indoor thermal environment of the system for its practical application in a residential building in the north-western City of Xi'an, China. The results show that energy saving of the solar heating system can be significantly improved by reducing the supplied water temperature, and the supplied water temperature of the RCT would be no more than 35. °C. The capillary radiation heating can adopt a lower water temperature and create a good thermal comfort environment as well. These results may lead to the development of designing and distributing the solar energy for building heating during winter. © 2016 Elsevier Ltd. Source

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