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Insulating gas hvdc unit wika

5. Thermal insulation materials, technical characteristics ... these cells of gas are filled with moisture, there are significant losses in insulating efficiency. The thermal conductivity of water (at 10 °C) is 0.5 kcal m -1 h -1 °C -1 and that of ice (at 0 °C) is 2 kcal m -1 h -1 °C -1 (about four times the value of water).

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