METROLOGICAL ASPECTS OF THE APPLICATION OF THE MONTE-CARLO METHOD IN THE EXPERIMENTAL DETERMINATION OF THE HEAT TRANSFER COEFFICIENT OF THE THERMOANEMOMETER

Abstract

The expediency of developing technical solutions for accounting of natural gas in energy units and the necessity of conducting metrological studies of modern technical means in this area are indicated. A Monte-Carlo computer simulation of the algorithmic method of experimental determination of the thermal anemometer heat transfer coefficient was carried out. The relationship between the summary standard uncertainty of the heat transfer coefficient of the thermo-anemometric converter and the maximum permissible measurement error of the parameters of the working environment and the operating conditions of the thermo-anemometer was investigated. The degree of influence on the uncertainty of the thermal anemometer heat transfer coefficient when applying the uniform and triangular laws of distribution of the measuring results of the geometric dimensions of the sensitive element of the thermoanemometric converter is established. The normal distribution law of the uncertainty of the heat transfer coefficient of the thermoanemometer was experimentally revealed, despite the uniform or triangular distribution law of the measured values of the geometric dimensions of the sensitive element of the thermoanemometric converter. Almost identical patterns of changes in the estimated values of the uncertainty of the heat transfer coefficient were established when using uniform and triangular distribution laws when measuring the electric current through the sensitive element of the thermoanemometric converter and its electrical resistance, as well as a slight (up to 0.1%) difference in the results of the obtained uncertainties of the heat transfer coefficient when measuring the temperature working environment.