shanae8028 shanae8028

13-11-2019
Engineering

contestada

Steam enters an adiabatic turbine at 8 MPa and 500C with a mass flow rate of 3
kg/s and leaves at 30kPa. The isentropic efficient of the turbine is 0.90. Neglecting the kinetic
energy change of the steam, determine
a. the temperature at the turbine exit
b. The power output of the turbine. (Answer: 3054 kW)

Respuesta :

fabianb4235 fabianb4235

17-11-2019

Answer:

a)temperature=69.1C

b)3054Kw

Explanation:

Hello!

To solve this problem follow the steps below, the complete procedure is in the attached image

1. draw a complete outline of the problem

2. to find the temperature at the turbine exit use termodinamic tables to find the saturation temperature at 30kPa

note=Through laboratory tests, thermodynamic tables were developed, these allow to know all the thermodynamic properties of a substance (entropy, enthalpy, pressure, specific volume, internal energy etc ..)

through prior knowledge of two other properties such as pressure and temperature.

3. Using thermodynamic tables find the enthalpy and entropy at the turbine inlet, then find the ideal enthalpy using the entropy of state 1 and the outlet pressure = 30kPa

4. The efficiency of the turbine is defined as the ratio between the real power and the ideal power, with this we find the real enthalpy.

Note: Remember that for a turbine with a single input and output, the power is calculated as the product of the mass flow and the difference in enthalpies.

5. Find the real power of the turbine

Ver imagen fabianb4235

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