Design and Uncertainty Analysis of Oil Flow Standard System

2003 ◽  
Author(s):  
Ki Won Lim
Keyword(s):  
Uncertainty Analysis ◽  
Flow Measurement ◽  
Uncertainty Budget ◽  
Standard System ◽  
Evaluation Procedure ◽  
Independent Variables ◽  
Operation Conditions ◽  
Oil Flow ◽  
Light Oil ◽  
Flow Quantity

A gravimetric flow standard system is established and in operation for the calibration of flowmeters with light oil (Calibration Oil K, Castrol). The Light Oil Flow Standard System (LOFSS), as one of the national flow standard system in Korea, can provide a direct primary calibration for any conventional oil flowmeter. The system, which is operated by the standing start and finish mode with the static weighing method, measures mass electronically from a gyroscopic scale. The flow of up to 350 m3/h is generated by two pumps and the main test line is designed with a 200 mm pipe diameter. For the uncertainty analysis of flow measurement by LOFSS, the equilibrium equation based on the calibration principle of the standard system was derived. The standard flow quantity is determined from the independent variables. Therefore the uncertainty of the independent variables were scrutinized with consideration of the operation conditions and combined for the expression of the uncertainty of the flow quantity determination. The evaluation procedure method follows the ISO Guide to the Expression of Uncertainty in Measurement. The expanded uncertainties in volume and mass flow measurement in the range of 18 and 350 m3/h are 0.04 and 0.01%, respectively. The uncertainty budget shows the contribution of the uncertainty of the independent variables to that of the flow quantity measurement.

scholarly journals Fuel Oil Flow Measurement on Ship

2017 ◽  
Vol 52 (3) ◽  
pp. 342-346
Author(s):  
Tomoyasu Shiomi ◽  
Yuji Yagura
Keyword(s):  
Flow Measurement ◽  
Fuel Oil ◽  
Oil Flow

scholarly journals Uncertainty Analysis of Hydrocarbon Flow Calibration Facility (1st Report, Uncertainty Analysis of Flow Measurement)

2005 ◽  
Vol 71 (712) ◽  
pp. 2956-2963 ◽  
Author(s):  
Takashi SHIMADA ◽  
Ryouji DOIHARA ◽  
Kazuhide TAKEDA ◽  
Yoshiya TERAO ◽  
Masaki TAKAMOTO
Keyword(s):  
Uncertainty Analysis ◽  
Flow Measurement ◽  
Calibration Facility

scholarly journals Optimal Operation Conditions for a Methane Fuelled SOFC and Microturbine Hybrid System

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Vincenzo De Marco ◽  
Gaetano Florio ◽  
Petronilla Fragiacomo
Keyword(s):  
Hybrid System ◽  
Current Density ◽  
Computer Code ◽  
Optimal Operation ◽  
Solid Oxide ◽  
Fuel Utilization ◽  
Utilization Factor ◽  
Independent Variables ◽  
Operation Conditions ◽  
Plant Configuration

The study of a hybrid system obtained coupling a methane fuelled gas microturbine (MTG) and a solid oxide fuel cell (SOFC) was performed. The objective of this study is to evaluate the operation conditions as a function of the independent variables of the system, which are the current density and fuel utilization factor. Numerical simulations were carried out in developing a C++ computer code, in order to identify the preferable plant configuration and both the optimal methane flow and the current density. Operation conditions are able to ensure elasticity and the most suitable fuel utilization factor. To confirm the reliability of the models, results of the simulations were compared with reference results found in literature.

scholarly journals Regulation Principles of Power Flow Gradients to Multiple Characteristic Independent Variables in UPFC Embedded Power System

2020 ◽  
Vol 10 (5) ◽  
pp. 1720 ◽  
Author(s):  
Jinlian Liu ◽  
Jian Yang ◽  
Zheng Xu ◽  
Zheren Zhang ◽  
Pengcheng Song
Keyword(s):  
Embedded System ◽  
Phase Angle ◽  
Power Flow ◽  
Reactive Power ◽  
Three Dimensional ◽  
Unified Power Flow Controller ◽  
Multiple Characteristic ◽  
Independent Variables ◽  
Operation Conditions ◽  
Flow Gradients

The power flows in the unified power flow controller (UPFC) embedded system is mainly regulated by the two variables containing the magnitude and the phase angle of the output series inserted voltage (OSIV) of UPFC. Different value combinations of the two variables can form multiple regulation modes of OSIV, and the regulation principles and efficiencies for power flows are distinct by different regulation modes. This paper dedicates to research the regulation principles of active and reactive power flow gradients (PFG) to multiple characteristic independent variables (CIVs) at several selected critical points (SCP) of the system in different operation conditions. The CIVs contains the magnitude of OSIV, the phase angle of OSIV, and the phase difference of the system. First, multiple power flow regulation modes of OSIV are designed, the mathematical models of the PFG to each CIV at each SCP are established, and the theoretical principles for the PFG to each CIV at each SCP are analyzed and compared. Next, four typical operation conditions of the system and four regulation scenarios are assumed and case studies for the PFG to each CIV at different SCP are carried out. The test results at each SCP are analyzed both in the two-dimensional planes and three-dimensional spaces. The regulation principles and efficiencies of PFG to each CIV at different SCP are compared with each other and summarized, which can offer useful references for practical engineering and applications of UPFC.

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