Technique for Evaluating the Uncertainty of Enthalpy of Water and Steam for Thermal Energy Metering Systems
Journal Title: Energy Engineering and Control Systems - Year 2018, Vol 4, Issue 2
Abstract
The paper presents an analysis of existing techniques for calculating the enthalpy of water (steam). Based on the analysis the techniques were defined that should be applied for computer-aided design of thermal energy metering systems. Equations for calculating relative expanded uncertainty of water (steam) enthalpy are developed taking into account methodical uncertainty of enthalpy calculation and uncertainties of metering temperature and pressure of water (steam). Simplified dependencies are developed for calculating the relative sensitivity coefficients of the enthalpy uncertainty to the uncertainties of water pressure and temperature. These dependencies make it possible to calculate the values of the sensitivity coefficients for a range of pressure from 0 to 5 MPa and temperature from 300 to 550 K. The relative deviations of the sensitivity coefficients obtained by the simplified dependencies from the values obtained by the equations of International Association for the Properties of Water and Steam (IAPWS) are 0.48% (for the sensitivity coefficient of uncertainty of enthalpy to uncertainty of pressure) and 0.56% (for the sensitivity coefficient of uncertainty of enthalpy to uncertainty of temperature) for the above pressure and temperature ranges. The developed simplified technique for evaluating uncertainty of water (steam) enthalpy can be applied to determine the metrological characteristic of thermal energy metering systems and also for their computer-aided design.
Authors and Affiliations
Fedir Matiko, Oksana Slabyk, Leonid Lesovoy, Halyna Matiko
Keywords
Related Articles
- EP ID EP425214
- DOI 10.23939/jeecs2018.02.079
- Views 80
- Downloads 0
Analysis of Methods for Extending the Life Cycle of a TP-100A Boiler
Reconditioning of the TP-100А boiler can be implemented via a number of engineering solutions, including a complete replacement of the heating surface of the primary and secondary steam superheating circuits, boiler drum...
Analysis of Fuzzy Controller Application Efficiency in Two-Mass Systems with Variable Moment of Inertia of Second Mass
A two-mass system with variable moment of inertia of the second mass has been considered. Common approaches to controller synthesis of such system were considered. A fuzzy robust controller was introduced. Comparison of...
Research and Analysis of Rapidly Changing Gas Flow Temperatures Measurement Methods
The temperature of a transducer sensitive element, as a result of its heat capacity, will always lag behind the temperature of the gas flow if this temperature changes. When measuring the flow temperature that varies in...
Identification of Controlled Plant and Development of Its Model by Means of PLC
The results of experimental and theoretical investigation of dynamic and static characteristics of a thermal object (electric oven) as a controlled plant are presented in the paper. The up-to-date microprocessor instrume...
Influence of Type of Solar Modules Anchorages on Power of Solar Power Station
Electricity generation through solar power plants is one of the ways to Ukraine's energy independence. The amount of electricity generated by a solar power plant depends on the intensity of the solar radiation entering o...