基于青岛市5栋既有办公建筑中央空调冷源系统的运行调研及分析,得到既有办公建筑实际运行最大单位面积冷负荷为45~-60 W/m^(2),以螺杆式冷水机组为冷源的冷源系统单位面积平均日能源消耗为0.057 k Wh,其中制冷主机耗电量占比61%。根据...基于青岛市5栋既有办公建筑中央空调冷源系统的运行调研及分析,得到既有办公建筑实际运行最大单位面积冷负荷为45~-60 W/m^(2),以螺杆式冷水机组为冷源的冷源系统单位面积平均日能源消耗为0.057 k Wh,其中制冷主机耗电量占比61%。根据实际运行的EER及COP对冷源系统整体能效及制冷主机的能效进行分析,得出制冷主机能效50%的时间里低于厂家标称能效。展开更多
High-speed vehicle dynamic envelope curve is defined as the maximum limit outline affected by a variety of adverse factors while the train is running. Considering the difficulties in the current measurement system suc...High-speed vehicle dynamic envelope curve is defined as the maximum limit outline affected by a variety of adverse factors while the train is running. Considering the difficulties in the current measurement system such as complicated calibration process,cumbersome aided-instruments,strict limitation of working distance, this paper carries out an optical method in which two high-speed cameras with variable-zoom lenses are adopted as binocular stereo sensors of measurement system and a high-ac-curacy 3D target with fast reconstruction is designed. The intrinsic parameters of the sensors and the relative positions between coordinate systems are solved by the method of colinearity constrained optimization algorithm. The calibration process is easy to operate and the device is also of portability. Most importantly, the severe working distance limitation between sensors and measured body is solved, enhancing the adaptability of measurement system to environment. Experimental results show that when the sensors are in the range of 8 -16 m away from the measured body, system accuracy can reach up to ±0. 5 mm, which meets the requirements to measure the dynamic envelope curve of high-speed vehicle.展开更多
文摘基于青岛市5栋既有办公建筑中央空调冷源系统的运行调研及分析,得到既有办公建筑实际运行最大单位面积冷负荷为45~-60 W/m^(2),以螺杆式冷水机组为冷源的冷源系统单位面积平均日能源消耗为0.057 k Wh,其中制冷主机耗电量占比61%。根据实际运行的EER及COP对冷源系统整体能效及制冷主机的能效进行分析,得出制冷主机能效50%的时间里低于厂家标称能效。
基金supported by the National Natural Science Foundation of China(Grant No.31750001,31700018,31270066)the Project for Adolescent Education Scientific Planning of Shandong Province(Grant No.18BSH054&18BSH055)
基金National Science and Technology Major Project(No.2016ZX04003001)
文摘High-speed vehicle dynamic envelope curve is defined as the maximum limit outline affected by a variety of adverse factors while the train is running. Considering the difficulties in the current measurement system such as complicated calibration process,cumbersome aided-instruments,strict limitation of working distance, this paper carries out an optical method in which two high-speed cameras with variable-zoom lenses are adopted as binocular stereo sensors of measurement system and a high-ac-curacy 3D target with fast reconstruction is designed. The intrinsic parameters of the sensors and the relative positions between coordinate systems are solved by the method of colinearity constrained optimization algorithm. The calibration process is easy to operate and the device is also of portability. Most importantly, the severe working distance limitation between sensors and measured body is solved, enhancing the adaptability of measurement system to environment. Experimental results show that when the sensors are in the range of 8 -16 m away from the measured body, system accuracy can reach up to ±0. 5 mm, which meets the requirements to measure the dynamic envelope curve of high-speed vehicle.
