Numerical no. 2|| Machine Design||Transformer||Estimate average temperature rise of transformer tank

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Q. A 15 MVA Transformer has an iron loss of 80kW and full load copper loss 120 kW. The tank dimension are 3.5x3x1.4m. The transformer oil in cooled by water of 3 liter per sec in cooling coil. Estimate the average temperature rise of the transformer tank if the difference in temperature of inlet and outlet of water is 15°C. The specific loss dissipation of the tank wall is 10W/m²°C.
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