Question: A scheme is devised to measure the thermal conductivity of soil by immersing a long electrically heated rod in the ground in a vertical position.

A scheme is devised to measure the thermal conductivity of soil by immersing a long electrically heated rod in the ground in a vertical position. For design purposes, the rod is taken as 2.5 cm in diameter with a length of 1 m. To avoid improper alteration of the soil, the maximum surface temperature of the rod is 55ºC while the soil temperature is 10ºC.Assuming a soil conductivity of 1.7W/m· ºC, what are the power requirements of the electric heater in watts?

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