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抗冲共聚聚丙烯(PP)低温摆锤冲击试验冷冻方式探究 被引量:1
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作者 王行连 《塑料助剂》 2019年第6期33-37,共5页
低温摆锤冲击强度是评估抗冲共聚聚丙烯(PP)产品在试验条件下脆性和軔性的重要质量指标,以抗冲共聚聚丙烯(PP)EPS30R、SP179为例,用液氮和冷滤机两种不同的冷冻方式对标准样条进行低温处理,对比探究摆锤冲击实验结果表明,冷滤机冷却效... 低温摆锤冲击强度是评估抗冲共聚聚丙烯(PP)产品在试验条件下脆性和軔性的重要质量指标,以抗冲共聚聚丙烯(PP)EPS30R、SP179为例,用液氮和冷滤机两种不同的冷冻方式对标准样条进行低温处理,对比探究摆锤冲击实验结果表明,冷滤机冷却效果完全可代替液氮冷却。 展开更多
关键词 摆锤冲击强度 冷滤机 液氮 低温性能
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Research on fault detection method for heat pump air conditioning system under cold weather 被引量:6
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作者 Liangliang Sun Jianghua Wu +1 位作者 Haiqi Jia Xuebin Liu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2017年第12期1812-1819,共8页
Building energy consumption accounts for nearly 40% of global energy consumption, HVAC (Heating, Ventilating, and Air Conditioning) systems are the major building energy consumers, and as one type of HVAC systems, t... Building energy consumption accounts for nearly 40% of global energy consumption, HVAC (Heating, Ventilating, and Air Conditioning) systems are the major building energy consumers, and as one type of HVAC systems, the heat pump air conditioning system, which is more energy-efficient compared to the traditional air conditioning system, is being more widely used to save energy. However, in northern China, extreme climatic conditions increase the cooling and heating load of the heat pump air conditioning system and accelerate the aging of the equipment, and the sensor may detect drifted parameters owing to climate change. This non-linear drifted parameter increases the false alarm rate of the fault detection and the need for unnecessary troubleshooting. In order to overcome the impact of the device aging and the drifted parameter, a Kalman filter and SPC (statistical process control) fault detection method are introduced in this paper. In this method, the model parameter and its standard variance can he estimated by Kalman filter based on the gray model and the real-time data of the air conditioning system. Further, by using SPC to construct the dynamic control limits, false alarm rate is reduced. And this paper mainly focuses on the cold machine failure in the component failure and its soft fault detection. This approach has been tested on a simulation model of the "Sino-German Energy Conservation Demonstration Center" building heat pump air-conditioning system in Shenyang, China, and the results show that the Kalman filter and SPC fault detection method is simple and highly efficient with a low false alarm rate, and it can deal with the difficulties caused by the extreme environment and the non-linear influence of the parameters, and what's more, it provides a good foundation for dynamic fault diagnosis and fault prediction analysis. 展开更多
关键词 Fault detection Cold machine Kalman filter Statistical process control Dynamic control
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