1. In a geothermal power plant, the used geothermal water at 80°C enters a 15-cm-diamete and 400-m-long uninsulated pipe at a rate of 8.5 kg/s and leaves at 70°C before being reinjected back to the ground. Windy air at 15°C flows normal to the pipe. Determine the average wind velocity [km/hr]. Assume that the pipe surface temperature is equal to the water temperature and that radiation heat transfer can be neglected.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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1. In a geothermal power plant, the used geothermal water at 80°C enters a 15-cm-diameter
and 400-m-long uninsulated pipe at a rate of 8.5 kg/s and leaves at 70°C before being
reinjected back to the ground. Windy air at 15°C flows normal to the pipe. Determine the
average wind velocity [km/hr]. Assume that the pipe surface temperature is equal to the
water temperature and that radiation heat transfer can be neglected.
Transcribed Image Text:1. In a geothermal power plant, the used geothermal water at 80°C enters a 15-cm-diameter and 400-m-long uninsulated pipe at a rate of 8.5 kg/s and leaves at 70°C before being reinjected back to the ground. Windy air at 15°C flows normal to the pipe. Determine the average wind velocity [km/hr]. Assume that the pipe surface temperature is equal to the water temperature and that radiation heat transfer can be neglected.
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