Steam enters an adiabatic turbine at 10 MPa and 500°C and leaves at 10 kPa with a quality of 90 percent. Neglecting the changes in kinetic and potential energies, determinethe mass flow rate (kg/s) required for a power output of 5 MW.

The value of mass flow rate from the turbine = 5.224

Explanation:

Turbine entrance pressure = 10 M pa

Turbine entrance Temperature ( ) = 500 °c = 773 kelvin

Turbine outlet pressure = 10 k pa

Quality at exit = 0.9

Specific heat for the steam = 2.108

From the steam table the temperature at pressure = 10 k pa of saturated liquid vapour steam is calculated. it is the exit temperature  .

⇒ Turbine exit Temperature ( ) = 46  °c = 319 kelvin

Power output of turbine ( )= 5 MW = 5000 KW

We know that Power output of turbine is given by = m × × ( - )

Put all the values in the above formula we get,

⇒ 5000 = m × 2.108 × ( 773 - 319 )

⇒ m = 5.224

This is the value of mass flow rate from the turbine.

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explanation:

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.