A benchmark data set for two-phase Coriolis metering

For more than a decade there has been growing interest in the use of Coriolis mass flow metering applied to two-phase (gas/liquid) and multiphase (oil/water/gas) conditions. It is well-established that the mass flow and density measurements generated from multiphase flows are subject to large errors, and a variety of physical models and correction techniques have been proposed to explain and/or to compensate for these errors. One difficulty is the absence of a common basis for comparing correction techniques, because different flowtube designs and configurations, as well as liquid and gas properties, may result in quite different error curves. Furthermore, some researchers with interests in the modelling aspects of the field may not have suitable multiphase laboratory facilities to generate their own data sets. This paper offers a small data set that may be used by researchers as a benchmark i.e. a common data set for comparing correction techniques. The data set was collected at the UK National Flow Laboratory TUV-NEL, using air and a viscous oil, and provides experimental points over a wide flow range (8:1 turndown) and with Gas Volume Fraction (GVF) values up to 60%. As a first investigation using the benchmark data set, we consider how data sparsity (i.e. the flow rate and GVF spacing in the experimental grid) affects the accuracy of a correction model. A range of neural network models are evaluated, based on different subsets of the benchmark data set. The data set and some exemplary code are provided with the paper. Additional data sets are available on a web site created to support this initiative.     

煤炭企业能源计量工作的实践与探讨

该文主要阐述了淄博矿业集团的能源计量工作,通过采取健全完善组织机制、强化基础管理、重点突破技术创新、多手段综合应用等多种措施,取得了明显成效,有力地促进了企业的节能减排和降本提效。     

移动式计量装置验收专用负荷箱的研制

本项目着力研发一种移动式计量装置验收专用负荷箱,可依据现场实际情况将其接入到专变低压出线处,提供稳定的测试负荷电流,完成计量装置验收关键步骤。主要的技术内容:通过接入电容器组,提供计量装置验收带负荷测试所需的电流,按不同容量电容器组配置合适分组空气开关,保护电容器组,降低同时投入时的冲击电流。本项目制作的计量装置验收专用负荷箱将使用高强度箱体,并制作不同容量的负荷箱以满足不同的计量装置验收负荷要求,以提高计量装置验收工作质量和率,降低电能计量差错风险。     

DEM study of particle motion in novel high-speed seed metering device

This paper presents a numerical study on the motions of seed particles in a novel high-speed seed metering device based on the discrete element method. The effects of key parameters, including inlet velocity of particles, feeding rates and the angle of seed cleaning element, are investigated by a series of controlled numerical experiments. The results show that in the seed filling area of the device, a better match of particle velocity and the tangential linear velocity of the seeding plate can improve the seed filling performance. The number of particles remaining in the metering device is an important factor that affects the device performance. A large number of particles in the device results in more multiple seeding, and a small number causes more leakage seeding. Under the conditions of the seeding plate rotational speed at 194.5 rpm (corresponding to the high ground speed of 14 km/h), feeding rate at ~14 seeds/s can ensure that around 24 seed particles are maintained in the device which generates minimum leakage and multiple seeding. The studies of the effect of the seed cleaning element angle show that an appropriate angle (e.g., 30°) can effectively enhance the clearing ability, increase the uniform stability of particles backflow, and improve the seeding performance.     

基于谐波反应法的空调冷量计量方法研究

根据空调建筑谐波反应系数法冷负荷计算基本原理，将谐波反应法用于空调冷量计量，并在实验中进行检验。结果表明，该法投资少于双温流量计量法，且计量精度高于计时法，能满足工程要求。     

基于MSP430系列单片机热量表的设计

介绍了热量表的技术要求及控制核心,对以MSP430系列单片机作为控制核心的热量表的硬件结构及主程序进行了研究。     

中央空调的分户计量系统

本文分析了目前传统的按面积平摊中央空调计费方式的缺点,按照“建设资源节约型社会”目标,提出了中央空调分户计量的意义、市场需求,介绍了两种有利于节能的中央空调系统分户计量系统。     

热表设于回水管上的供暖分户计量系统

该系统比较适合于旧供暖系统的改造。介绍了系统的布置方法及回水管的几种敷设形式.     

计量供热收费中存在的问题及解决方法

探讨了推行计量供热收费过程中遇到的一些问题及解决方法。     

基于神经网络的供热计量系统热负荷短期预测

针对实行热计量后热负荷变化的特点，采用神经网络中应用最广泛的BP网络对热负荷进行预测，利用MATLAB仿真程序对所建立的人工神经网络负荷预测模型进行验证，仿真误差为6．93％，满足工程需要。