000K  utf8
1100  $c2021
1500  eng
2050  urn:nbn:de:gbv:8:3-2022-00040-3
2051  10.3390/en14238191
3000  Ahmad, Shahbaz
3010  Arp, Joan Chetam Christine
3010  Islam, Saiful
3010  Rizvi, Zarghaam Haider
3010  Tirth, Vineet
3010  Wuttke, Frank
4000  Evolution of Temperature Field around Underground Power Cable for Static and Cyclic Heating  [Ahmad, Shahbaz]
4209  Power transmission covering long-distances has shifted from overhead high voltage cables to underground power cable systems due to numerous failures under severe weather conditions and electromagnetic pollution. The underground power cable systems are limited by the melting point of the insulator around the conductor, which depends on the surrounding soils’ heat transfer capacity or the thermal conductivity. In the past, numerical and theoretical studies have been conducted based on the mechanistic heat and mass transfer model. However, limited experimental evidence has been provided. Therefore, in this study, we performed a series of experiments for static and cyclic thermal loads with a cylindrical heater embedded in the sand. The results suggest thermal charging of the surrounding dry sand and natural convection within the wet sand. A comparison of heat transfer for dry, unsaturated and fully saturated sand is presented with graphs and colour maps which provide valuable information and insight of heat and mass transfer around an underground power cable. Furthermore, the measurements of thermal conductivity against density, moisture and temperature are presented showing positive nonlinear dependence.
4950  https://doi.org/10.3390/en14238191$xR$3Volltext$534
4950  https://nbn-resolving.org/urn:nbn:de:gbv:8:3-2022-00040-3$xR$3Volltext$534
4961  https://macau.uni-kiel.de/receive/macau_mods_00002400
5051  550
5051  600
5051  621.3
5550  convection in porous media
5550  cyclic thermal loading
5550  thermal conductivity
5550  underground power cable
5550  vadose zone heat transfer