The purpose of the diploma thesis was to measure and calculate the heating curve of the electric oil-filled radiator. We also made a comparison with a water-filled radiator, which has until now been used for study purposes in laboratory exercises. When comparing radiators, we wanted to show the essential physical differences, as well as the heating curve, which is very different due to different materials and fillings.
To calculate the heating curve, we had to measure very accurately and calculate the horizontal, vertical and radiant surfaces of the radiator, which represent the most important part, so that the results of the calculated heating curve match the measured ones.
The measured heating curve was measured by a special programmer on the computer. The temperature of the radiator was measured using a thermocouple, which cold end was in a specially isolated container that was filled with crushed ice. The hot end of the thermocouple measured the temperature on the radiator.
The temperature of the radiator was measured at two points. The first point was in the middle of the radiator and the second point at the bottom. Since there were large differences in temperature and unexpected heating curve measured by the programmer during the measurement, we had to deal with the problems promptly. The essential problem was the operation of the heater with an oil-filled radiator that did not even heat the oil inside the radiator.
Due to the inconsistent measurements, the temperature measurement point on the radiator was moved near the heater, which was located in the lower part of the radiator.
Measurements made with an oil-filled radiator were divided into three parts. The first part covers those measurements for which we measured the temperature at the bottom of the radiator, and the measured heating curves are approximately constant. In the second part, measurements were made for which we measured the temperature of the middle part of the radiator, and the measured heating curves are inconsistent. In the third part, there are those measurements where we measured the temperature at the bottom of the radiator. These results proved to be the most accurate.
We also made a comparison between the oil-filled radiator and the water-filled radiator. In addition to the various physical dimensions between them, the most important difference was the substance located inside the radiator.
With processing data and graph analysis, we concluded that at the beginning the most important part is the correct calculation and measurement of all surfaces of the radiator, since only in this way can the heating curve be properly calculated in the next steps. It is also very important that the point of temperature measurement is chosen correctly and reasonably, otherwise we can get very different flows of heating curves that can have a negative impact on the environment, on people, etc., in key situations.
The goal of the diploma thesis was to show that with simple methods of temperature measurement and with very little financial input, we can achieve accurate results, if the device (in our case the radiator) is working properly.