Y. M. Choi, N. D. Trang, W. Kang, Y. Terao, N. Kurihara, A. Iwai, T. Funaki, S. H. Bak, C. S. Yoo, Y. T. Kwon
The Mutual Recognition Arrangement (MRA) is framed by the International Committee of Weights and Measures in order to establish the degree of equivalence of national measurement standards via the key comparisons as well as the inter-comparisons of measurements. Based on this objective, the current work was performed in order to determine the degrees of equivalence among three laboratories in Korea Research Institute of Standards and Science (KRISS), National Metrology Institute of Japan (NMIJ) and HCT company for air speed over the range from 2 m/s to 40 m/s. In this inter-comparison of air...
E. Audrito, F. Bertiglia, M. Bisi, C. Francese, G. La Piana, A. Piccato, M. Santiano, P. G. Spazzini
INRIM realizes its flow rate standard using three distinct facilities, aimed at measuring different flow rate ranges; in particular, for the larger flow range (10-2600 L/min) a piston of 1000 mm nominal diameter and 1200 mm nominal stroke is used. The traceability of the standard is obtained through dimensional calibration of the piston, regarding both the piston size and its stroke. The first calibration of the machine was performed at its initial installation. Even if most of the relevant documentation about this first calibration is not available, INRIM realized a procedure similar to the...
S. Oertel, M. Eggert, C. Gutsmuths, P. Wilhelm, H. Müller, H. Többen
Wind lidar systems have become a cost-efficient alternative to wind met masts in the recent years to measure and monitor the wind velocity in many applications in the fields of wind energy and meteorology. Conventional wind lidar systems work according to the monostatic measurement principle that is inherently accompanied by a spatial and temporal averaging procedure. This averaging procedure complicates the traceability of such systems as the uncertainty of the measured wind velocity depends on the homogeneity of the investigated wind fields. In contrast, the wind lidar system presented...
O. Büker, K. Stolt
In the framework of the ongoing EMPIR JRP 16ENG01 “Metrology for Hydrogen Vehicles” a main task is to investigate the influence of pressure on the measurement accuracy of Coriolis Mass Flow Meters (CFM) used at Hydrogen Refueling Stations (HRS). At HRS hydrogen is transferred at very high and changing pressures with simultaneously varying flow rates and temperatures. It is clearly very difficult for CMFs to achieve the later expected legal requirements in relation to the demand for accurate mass flow measurement at the measurement conditions at HRS. It was observed, mainly due to the very...
R. Maury, C. Auclercq, C. Devilliers
Of all alternatives to gasoline fuels, hydrogen offers the greatest long-term potential to radically reduce many problems inherent in transportation fuel use. Hydrogen vehicles have zero tailpipe emissions and are very efficient. If it is made from renewable sources, nuclear power, or fossil sources with carbon emissions captured and sequestered, hydrogen use on a global scale could produce nearly zero greenhouse gas emissions and greatly reduce emissions of air pollutants.The aim of this work is to realise a traceability chain for hydrogen flow metering in the range typical for fuelling...
A. K. Niemann, S. Haack, J. Frederiksen
Danish Technological Institute (DTI) is extending the flowrate of the existing flow rig up to 1.000 m³/h in the temperature span from 4 – 85 °C and pipe dimension up to DN400, and thereby become a unique calibration facility. The new test rig will serve as the national primary standard for the field of water flow measurement and thereby replacing the current at DTI. From 0.5 – 500 m³/h the test rig is based on gravimetric principle using a diverter principle. From 500 – 1000 m³/h the test rig is based on reference flow metering. The reference flow meters will consist of two high precision...
T. Meng, C. Xing, B. Wu, C. Wang, H. C. Shi, X. P. Li
Because the flow fluctuation can cause the deviation of flow measurement, flow stabilizing methods are used, in the most of the flow metering facilities. Two common flow stabilizing methods of water flow facilities are tested by a new flow stability measurement system which is consisted by a flowmeter and a pressure sensor. The amplitude of fluctuation can be measured by flowmeter, and the frequency of fluctuation can be obtained by FFT (Fast Fourier Transform) analysis of the pressure signal. The direction of fluctuation source can be distinguished by correlation analysis of pressure and...
J. Geršl, P. Busche, M. de Huu, D. Pachinger, H. Müller, K. Hölper, A. Bertašienė, M. Vilbaste, I. Care, H. Kaykısızlı, L. Maar, S. Haack
In this paper we report on the first results of EURAMET project no. 1431 which was initiated in 2017 with a goal to experimentally determine systematic deviations of calibration results of vane and cup anemometers due to various boundary conditions in different wind tunnels especially in wind tunnels with open test section where theoretical models are missing. For that purpose 3 vane anemometers and 2 cup anemometers of various dimensions have been calibrated in 14 wind tunnels with various types and sizes of test sections ranging from 15 cm to 100 cm in diameter. This paper provides the...
D. T. Nguyen, W. Kang, Y. M. Choi, S. H. Lee, Y. M. Choi
In order to attempt to mitigate the climate change, efforts to reduce the quantity of carbon emissions by actively seeking CO2 trading and carefully control the liability of the emission test monitoring system from the industrial factories are a current issue. Therefore, the quality of greenhouse gas (GHG) emissions measurement with a proper uncertainty needs to be firstly considered. Currently, GHG emissions are estimated by a continuous emission measurement (CEM). The U.S Environmental Protection Agency (EPA), has classified the measurement of GHG emissions by the CEM as the highest...
S. H. Lee, M. Link, B.-R. Yoon, E. Frahm
In this study, the hydrocarbon liquid flow rate was measured using both volumetric and gravimetric methods. Both methods are representative reference techniques for measuring the hydrocarbon flow rate. The volumetric method uses a calibrated volume tank, while the gravimetric method is based on a calibrated balance. Using these two methods, which have different traceability systems, a Coriolis flowmeter was calibrated under comparable flow conditions. The deviation and uncertainty of the flow measurement results obtained from the volumetric and gravimetric methods were analyzed. The study...