The aim of the thesis was to determine the measurement uncertainty of the measuring line for heat loss measurements. The measuring line is intended for determining the heat losses of residential stations of the company Danfoss, where I also completed my thesis. With the appropriate measuring equipment, it was necessary to determine the measurement uncertainty of the modules for voltage, current and temperature recording modules. The main goal was not only to determine the measurement uncertainty, but to ensure that it will be as small as possible. The scope of the thesis is divided into three main parts.
The first part describes the theoretical background of heat losses and the operating principle of the measuring station. I also briefly describe all the elements that make up the measuring track. The greatest emphasis is on National Instruments modules for measurements of alternating electric voltage, electric current and two modules for temperature measurements, on which are resistance sensors and thermocouples.
In the second part, measurements and calibration results are presented. All the measuring equipment with which I performed the calibration process is also described. All measurements were carried out using the comparative method, which means that the value of the reference meter and the meter that we want to calibrate are compared. When performing such measurements, it was necessary to obtain a calibration sheet from the reference meter for correct measurement uncertainty calculations.
The last part is dedicated to uncertainty calculations for each module separately. All factors that can indirectly affect the final result and thereby increase the doubt in the measuring equipment and expand the total uncertainty are also described.
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