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May 30, 2015

Homework Help: Physics

Posted by Erica on Tuesday, November 21, 2006 at 4:37pm.

Spent steam from an electric generating plant leaves the turbines at 120.0 degrees Celsius and is cooled to 90.0 degrees Celsuius liquid water by water from a cooling tower in a heat exchanger. How much heat is removed by the cooling tower water for each kilogram of spent steam?

q1 = heat removed by moving steam from 120.0 degrees C to steam @ 100.0 degrees C.
q1 = mass x specific steam steam x (Tf-Ti).

q2 = heat removed by condensing steam @ 100.0 degrees C to liquid water at 100.0 degrees C.
q2 = mass x heat of condensation (same as heat of vaporization but different sign).

q3 = heat removed by moving liquid water from 100.0 degrees C to 90.0 degrees C.

Total heat removed is q1 + q2 + q3.
The problem doesn't exactly specify a mass but it asks for heat per kg so I would use 1 kg or 1000g for mass in each of the above equations.

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