Abstract
This paper presents the method of estimating the uncertainty of temperature measurements conducted using K-type thermocouples in the study of flow boiling heat transfer in minichannels. During heat transfer experiments. the fluid temperature at the inlet and outlet of the minichannel is measured with thermocouples connected to a DaqLab 2005 data acquisition station. The major part of the experimental setup for calibration of temperature measurement included a calibrator of thermocouples. The thermocouples were manufactured by Czaki Thermo-Product. Poland. The temperatures recorded with the thermocouples were compared statistically while measuring the temperature of demineralised water at several characteristic points at liquid phase change or using the reference temperature known from the calibrator. The experimental error of the temperature measurement method was determined according to the principles of statistical analysis. Estimates of the mean value and the experimental standard deviation of the experimental error as well as the confidence interval for a single experimental error and the measurement accuracy were presented. The uncertainty of the difference in temperature was also calculated
Highlights
Contact and contactless methods can be used for measuring temperature
This paper presents the method of estimating uncertainty of temperature measurements conducted using K-type thermocouples
The temperatures recorded with the thermocouples were compared statistically while measuring the temperature of demineralised water at several characteristic points at liquid phase change or using the reference temperature known from the calibrator
Summary
Contact and contactless methods can be used for measuring temperature. The comparison of selected two methods for temperature measurement as follows: - infrared thermography and liquid crystals thermography contactless surface temperature measurements - were discussed in [1], - using thermocouples (contact method) and infrared camera (contactless method) - were described in [2]. The common contact method for temperature measurement is using thermocouples for measuring the surface temperature or fluid temperature. Seebeck discovered in 1821 that it was possible to create an electrical voltage by soldering two different metals (known as “the Seebeck effect”). Researchers often use thermocouples connected to the data acquisition stations for temperature measurement as a convenient and accurate method.
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