2020-10-25

I made a theme report in the sub-forum of The Third International Conference on Sustainable Development of Shanshui Cities held in Chongqing. The new infrastructure system includes three aspects: first, information infrastructure, including communication networks, new technologies and computing power and facilities; Second, the integration of infrastructure, the integration of different technologies and the use of new infrastructure, such as smart transportation, smart energy and smart architecture; Third, the innovation infrastructure, which is a series of infrastructure platforms that support innovation, such as industrial innovation infrastructure. The implementation of new infrastructure cannot be separated from the support of big data. In the application of big data, three major problems need to be faced: how do computers know and understand data, how do computers manage big data and how should big data create value.

2020-9-17

“Extraction Technique of Standardized Dynamic Big Data of Buildings and Attached MEP Systems” has been approved in expert evaluation. This technique is an achievement of the National Key R&D Program subject “Key Techniques of Data Integration and Databases for Buildings and Attached MEP Systems” (project number: 2017YFC0704202) under the project “Research and Exemplification of Green Building Management Technologies based on Full-Process Big Data”, independently developed by the research team. It addresses the problems of incompatibility among energy consumption monitoring systems, and complications in energy consumption monitoring data, and proposed an entity-relationship-model-based standardized energy consumption data model for buildings and attached MEP systems on the basis of energy consumption data criteria, stipulating the organization and description of energy consumption data. There forth, it proposed an integration method for energy consumption monitoring data, and an energy consumption data extraction method based on standardized interfaces and relay servers, and implemented pertinent software to validate the methods. This technique provided a solution for the extraction of standardized dynamic energy consumption data from multi-source heterogeneous energy consumption monitoring systems, laying the foundation for analyses and applications of energy consumption big data, thus possessing important application value and reference significance.

2020-9-21

A Novel Probabilistic Approach to Optimize Stand-Alone Hybrid Wind-Photovoltaic Renewable Energy System has been published in Energies .

In this paper, a novel probabilistic approach is proposed to optimize a stand-alone hybrid wind-photovoltaic renewable energy system installed in the South China Sea. This approach uses the levelized cost of energy (LCOE) as the objective and the stability of the power generation as the constraint. In addition, the present study proposes a model of a battery-level coefficient, based on which the battery capacity can be probabilistically estimated, given the expected power shortage in a given continuous duration. This model discusses the optimization employing genetic algorithm (GA) when the model estimating the power generated from a hybrid wind- photovoltaic power system (HWPS) with a specific configuration is combined with the widely used cost model. The optimization verifies that the proposed probabilistic approach provides reasonable estimates of the power generation of a hybrid system in an optimization process. The verification reveals that the specifications of the duration to calculate the expected power shortage could have significant impacts on the estimates of power generations. Consequently, the present study performs a sensitivity analysis concerning the continuous power deficit days. The optimization and sensitivity analyses both indicate that the well-established loss of power supply probability (LPSP) criterion of 1% should not be applied universally across the South China Sea. In the areas with more stable winds and solar resources, the LPSP criterion can be relaxed when only the power deficit duration is concerned.

2020-9-4

“BIM/GIS-based wind environment simulation platform for building group in Shenzhen” has won the second prize of the 9^th “Longtu Cup” National BIM Competition. The “Longtu Cup” National BIM Competition is organized by the China Graphics Society and is an influential event in the field of BIM research and application in China. The entry was completed in cooperation with the research team of Dr. Sun-Wei Li. from Tsinghua Shenzhen International Graduate School to address the lack of effective analysis tools and accurate building data in the field of building group wind environment simulation, we developed a building group wind environment simulation platform based on BIM and GIS. The platform accessed building and climate data for wind field simulation through open datasets on the Internet, and implements BIM/GIS data integration and storage in the cloud. Subsequently, the platform developed the core simulation module based on the CFD (Computational Fluid Dynamics) software OpenFOAM. Finally, the graphics module was developed based on Cesium to support simulation result visualization and user interaction. Besides Shenzhen, the platform has subsequently implemented support for major cities in China including Beijing, Shanghai and Wuhan. As the highlight, the platform explored the feasibility of combing BIM/GIS with wind environment simulation, and promoted the application of wind field analysis in the AEC industry and epidemic prevention and control.

2020-9-1

"Active and passive earth pressure model test device for limited cohesive soil behind flexible retaining wall of foundation pit" has obtained the national utility model patent certificate (Patent No. ZL201922125843.5; Authorization Announcement No. CN211401942U; Certificate No. 11385299). The utility model is a cooperation between the research group and Shenzhen Metro Group Co., Ltd. It provides a model test device for active and passive earth pressure analysis of limited cohesive soil behind a flexible retaining wall of a deep foundation pit. Aiming at the characteristics of the soft cohesive soil commonly encountered in practice, as well as the multiple deformation modes of the retaining structure adjacent to the existing underground structure with large stiffness in the dense environment, the laws and magnitudes of active and passive earth pressures and displacements of soft cohesive soil for different limited soil width were obtained. The model clay is proportional to the weighted average of the physical and mechanical properties of the prototype clay. Transparent movable baffles and grooves are used to control the limited soil width, and displacement control handles are used to precisely control the deformation mode and displacement of the model wall which used to simulate the retaining wall. It has certain engineering application value and reference significance to the deformation, mechanics and stability analysis of foundation pit in dense soft clay.