Question

каков КПД паровой турбины если пар поступает в неё с температурой 480 градусов а оставляет её при температуре 300 градусов

Answer 1

КПД=(Т1-Т2)/Т1

Т1=480
Т2=300

КПД = (480-300)/480=0,375 или около 38%

Answer 2

Calculating the Efficiency of a Steam Turbine

To calculate the efficiency of a steam turbine, we can use the following formula:

Efficiency (η) = (Work output / Energy input) × 100%

Where: - Work output is the difference between the enthalpy of the inlet steam and the enthalpy of the outlet steam. - Energy input is the enthalpy of the inlet steam.

Enthalpy Calculation

The enthalpy of the steam at the inlet and outlet temperatures can be calculated using the steam tables or steam properties calculator. The enthalpy values are typically provided in kJ/kg.

For the given temperatures of 480°C at the inlet and 300°C at the outlet, we can calculate the enthalpy values using the steam tables or a steam properties calculator.

Efficiency Calculation

Once the enthalpy values are determined, we can use the formula for efficiency to calculate the efficiency of the steam turbine.

Efficiency (η) = ((h1 - h2) / h1) × 100%

Where: - h1 is the enthalpy of the steam at the inlet temperature. - h2 is the enthalpy of the steam at the outlet temperature.

Conclusion

To provide an accurate efficiency value, the specific enthalpy values for the given temperatures need to be calculated using the appropriate steam properties data.