Technique for Evaluating the Uncertainty of Enthalpy of Water and Steam for Thermal Energy Metering Systems
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...
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| Format: | Article |
| Language: | English |
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Lviv Polytechnic National University
2018-12-01
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| Series: | Energy Engineering and Control Systems |
| Subjects: | |
| Online Access: | https://science.lpnu.ua/jeecs/all-volumes-and-issues/volume-4-number-2-2018/technique-evaluating-uncertainty-enthalpy-water |
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| _version_ | 1850224975715237888 |
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| author | Fedir Matiko Oksana Slabyk Leonid Lesovoy Halyna Matiko |
| author_facet | Fedir Matiko Oksana Slabyk Leonid Lesovoy Halyna Matiko |
| author_sort | Fedir Matiko |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-c366eea23fe44830b95e88e5dae0ff2e |
| institution | OA Journals |
| issn | 2411-8028 2415-7287 |
| language | English |
| publishDate | 2018-12-01 |
| publisher | Lviv Polytechnic National University |
| record_format | Article |
| series | Energy Engineering and Control Systems |
| spelling | doaj-art-c366eea23fe44830b95e88e5dae0ff2e2025-08-20T02:05:29ZengLviv Polytechnic National UniversityEnergy Engineering and Control Systems2411-80282415-72872018-12-0142798610.23939/jeecs2018.02.079Technique for Evaluating the Uncertainty of Enthalpy of Water and Steam for Thermal Energy Metering SystemsFedir Matiko0Oksana Slabyk1Leonid Lesovoy2Halyna Matiko3Lviv Polytechnic National UniversityLviv Polytechnic National UniversityLviv Polytechnic National UniversityLviv Polytechnic National UniversityThe 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.https://science.lpnu.ua/jeecs/all-volumes-and-issues/volume-4-number-2-2018/technique-evaluating-uncertainty-enthalpy-waterwater enthalpyuncertainty of enthalpytechnique for evaluating uncertaintysensitivity coefficientthermal energy amount |
| spellingShingle | Fedir Matiko Oksana Slabyk Leonid Lesovoy Halyna Matiko Technique for Evaluating the Uncertainty of Enthalpy of Water and Steam for Thermal Energy Metering Systems Energy Engineering and Control Systems water enthalpy uncertainty of enthalpy technique for evaluating uncertainty sensitivity coefficient thermal energy amount |
| title | Technique for Evaluating the Uncertainty of Enthalpy of Water and Steam for Thermal Energy Metering Systems |
| title_full | Technique for Evaluating the Uncertainty of Enthalpy of Water and Steam for Thermal Energy Metering Systems |
| title_fullStr | Technique for Evaluating the Uncertainty of Enthalpy of Water and Steam for Thermal Energy Metering Systems |
| title_full_unstemmed | Technique for Evaluating the Uncertainty of Enthalpy of Water and Steam for Thermal Energy Metering Systems |
| title_short | Technique for Evaluating the Uncertainty of Enthalpy of Water and Steam for Thermal Energy Metering Systems |
| title_sort | technique for evaluating the uncertainty of enthalpy of water and steam for thermal energy metering systems |
| topic | water enthalpy uncertainty of enthalpy technique for evaluating uncertainty sensitivity coefficient thermal energy amount |
| url | https://science.lpnu.ua/jeecs/all-volumes-and-issues/volume-4-number-2-2018/technique-evaluating-uncertainty-enthalpy-water |
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