E3S Web Conf.
Volume 19, 2017International Conference Energy, Environment and Material Systems (EEMS 2017)
|Number of page(s)||4|
|Published online||23 October 2017|
Heat transfer coefficient as parameter describing ability of insulating liquid to heat transfer
Poznan University of Technology, Institute of Electrical Power Engineering, 60965 Poznan, Poland
⁎ Corresponding author: email@example.com
The paper presents the results of the measurements of heat transfer coefficient of insulating liquids used in transformers. The coefficient describes an ability of the liquid to heat transport. On the basis of the coefficient, effectiveness of cooling system of electric power devices can be estimated. Following liquids were used for the measurements: mineral oil, synthetic ester and natural ester. It was assumed that surface heat load is about 2500 W·m-2, which is equal the load of transformer windings. A height of heat element was 1.6 m, because it makes possible steady distribution of temperature on its surface. The measurements of heat transfer coefficient was made as a function of various position of heat element (vertical, horizontal). In frame of horizontal position of heat element, three suppositions were analysed: top, bottom, and side.
© The authors, published by EDP Sciences, 2017
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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