At present, the fire performance of vehicles is highly concerned in domestic and international rail transit market projects [1], where the fire performance of the vehicle’s underframe is a crucial factor that restricts the fire safety of the entire rail vehicle. How to improve the fire resistance of vehicle underframe structure has become the focus and difficulty of vehicle fire engineering [2]. This article introduces main international fireproof standards applicable for urban rail vehicles. Then, based on the typical underframe structures of urban rail vehicles stainless steel body, three refractory structure models on different underframe structures are established by using different fireproof insulation materials as underframe fillers. Moreover, fire resistance tests are conducted on samples of three underframe models to verify the effectiveness of those fire performance. As per the fire test results, the crucial indexes such as heat insulation, fire resistance, temperature rise curve, fire resistance time and material cost of different filler insulation materials are compared and summarized. Finally, the standardized and modular design specification is suggested on refractory underframe structures in urban rail vehicles.

This paper discusses how to improve thermal insulation performance through one or several effective methods when designing rail vehicles. These methods are all validated by simulation analysis and testing. The EMU (Electric Multiple Unit) train is selected as a basic model for thermal analysis. The vehicle is divided into several modules based on thermal insulation characteristics and different thermal insulation materials and applications are compared and analyzed. A design solution which could improve the overall thermal insulation performance of the vehicle is proposed. The vehicle structure is divided into modules on different levels, and the thermal insulation performance of each module is analyzed preliminarily. Based on the proportion of each module in the vehicle, its influence on the overall thermal insulation performance is evaluated. Typical modules include carbody underframe, side wall and roof. Based on the preliminary thermal analysis results of modules above, the typical models of each component are established for study, calculation, and testing. The thermal insulation coefficients of different areas are compared to determine which one has the most potential of thermal insulation improvement. Technical cost, material cost and manufacturability are comprehensively analyzed to figure out the most reasonable insulation solutions for each module. Then, the proportion of each module in the vehicle and overall costs of thermal insulation proposal are analyzed to identify the correlation between the structure of each module and improvement of vehicle level thermal insulation performance. The solution to effectively improve the thermal insulation is proposed from a decision matrix, which consists of importance of proportion, difficulty of realization and comprehensive cost. At last, the simulation analysis and test data of the overall vehicle heat insulation performance are compared to validate the consistency between theoretical analysis and practice, which could further prove that the design solution proposed in this paper is feasible and effective.

Xiongan New Area is another important new area after Shenzhen Special Economic Zone and Shanghai Pudong New Area. According to the development strategy of high-point positioning of the new area, providing safe, reliable, clean and economic modern energy system for Xiongan New Area is one of the important tasks in the construction of the new area. In the process of establishing and optimizing the energy system, reliable data of energy consumption and load characteristics should be obtained first. This paper analyses the types of buildings in the new area and the local climate and meteorological changes, and takes into account the energy consumption of various internal and external factors. Based on this, the different climate conditions of different buildings in a year are discussed. The load characteristics of thermal and cold power are analyzed. Finally, a prediction method of thermal and cold load data considering climate and meteorological information, typical structural parameters of buildings, internal and external disturbances is established.

With the rapid development of rail transit vehicle technology in recent years, railway vehicles are constantly developing in novel directions of lightweight, integration, intelligence, as well as environmental protection and energy saving. The application of electric heating floors in railway vehicles is one of the innovative attempts. This paper first illustrates the working principle, applicable standards, typical structure, mechanical performance, and technical parameters of the electric heating floor. Subsequently, simulation analysis on the heating floor samples is conducted, and the simulation data of compressive strength is obtained for this heating floor. The result of the analysis illustrates that the mechanical performance of the heating floor is not distinct from the normal floor, which meets the requirements of railway vehicle utilization. Then, simulation and comparison between the railway vehicle heating system using traditional heaters and electric heating floors are performed, to evaluate the heating effects in different ambient temperatures. Finally, this paper explores the technical difficulties and application prospects of the heating floor in railway vehicles.