Answer: The ventilating fan of the bathroom of a building

Chapter 5, Problem 55

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QUESTION:

Steam enters a steady-flow turbine with a mass flow rate of  at ,, and a negligible velocity. The steam expands in the turbine to a saturated vapor at  where 10 percent of the steam is removed for some other use. The remainder of the steam continues to expand to the turbine exit where the pressure is 10 kPa and quality is 85 percent. If the turbine is adiabatic, determine the rate of work done by the steam during this process.

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QUESTION:

Steam enters a steady-flow turbine with a mass flow rate of  at ,, and a negligible velocity. The steam expands in the turbine to a saturated vapor at  where 10 percent of the steam is removed for some other use. The remainder of the steam continues to expand to the turbine exit where the pressure is 10 kPa and quality is 85 percent. If the turbine is adiabatic, determine the rate of work done by the steam during this process.

ANSWER:

Step 1 of 5

Steam expands in a two-stage adiabatic turbine from a specified state to another state. Some steam is extracted at the end of the first stage. The power output of the turbine is to be determined.

We will assume

1. This is  a steady-flow process since there is no change with time.

2. Kinetic and potential energy changes are negligible .

3. The turbine is adiabatic and thus heat transfer is negligible.

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