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At the steam power plant, the superheated steam from boiler is expanded through turbine from initial pressure p₁ = 70 bar and temperature T₁ = 487 °C to pressure of condenser p₂ = 18 kPa. The isentropic efficiency of the turbine ns is 80.0%. The mass flow rate of the steam qm is 140 kg/s. Fuel power is 429 MW. After condenser, the working fluid is saturated water. Boiler efficiency is 90.0%, pump efficiency is 81.0 %, mechanical efficiency of the turbine is 96.0%, generator efficiency is 98.0% and auxiliary power efficiency is 97.0%. Boiler 1. Turbine Generator 2. Condenser 4. 3. Feed water pump Read from h,s-chart and calculate: 1. Enthalpy of the superheated steam h kJ/kg (with zero decimal accuracy) 2. Enthalpy of the steam after isentropic expansion s 3. Enthalpy of the steam at the turbine outlet h₂ 4. Turbine power without mechanical losses Pt 5. Steam content at the turbine outlet X2 kJ/kg (with zero decimal accuracy) kJ/kg (with zero decimal accuracy) MW (with one decimal accuracy) (with two decimal accuracy) 6. Enthalpy after condenser h3 7. Heat removed by the condenser Q 8. Specific volume of water after condenser v3 9. Enthalpy before boiler h4 kJ/kg (with zero decimal accuracy) MW (with one decimal accuracy) m³/ton (with three decimal accuracy) kJ/kg (with zero decimal accuracy) 10. Power of feed water pump Pp 11. Thermal efficiency of the plant t MW (with two decimal accuracy) % (with one decimal accuracy) 12. Efficiency of electricity production ne % (with zero decimal accuracy)

At the steam power plant, the superheated steam from boiler is expanded through turbine from initial pressure p₁ = 70 bar and temperature T₁ = 487 °C to pressure of condenser p₂ = 18 kPa. The isentropic efficiency of the turbine ns is 80.0%. The mass flow rate of the steam qm is 140 kg/s. Fuel power is 429 MW. After condenser, the working fluid is saturated water. Boiler efficiency is 90.0%, pump efficiency is 81.0 %, mechanical efficiency of the turbine is 96.0%, generator efficiency is 98.0% and auxiliary power efficiency is 97.0%. Boiler 1. Turbine Generator 2. Condenser 4. 3. Feed water pump Read from h,s-chart and calculate: 1. Enthalpy of the superheated steam h kJ/kg (with zero decimal accuracy) 2. Enthalpy of the steam after isentropic expansion s 3. Enthalpy of the steam at the turbine outlet h₂ 4. Turbine power without mechanical losses Pt 5. Steam content at the turbine outlet X2 kJ/kg (with zero decimal accuracy) kJ/kg (with zero decimal accuracy) MW (with one decimal accuracy) (with two decimal accuracy) 6. Enthalpy after condenser h3 7. Heat removed by the condenser Q 8. Specific volume of water after condenser v3 9. Enthalpy before boiler h4 kJ/kg (with zero decimal accuracy) MW (with one decimal accuracy) m³/ton (with three decimal accuracy) kJ/kg (with zero decimal accuracy) 10. Power of feed water pump Pp 11. Thermal efficiency of the plant t MW (with two decimal accuracy) % (with one decimal accuracy) 12. Efficiency of electricity production ne % (with zero decimal accuracy)

Refrigeration and Air Conditioning Technology (MindTap Course List)
Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter28: Special Refrigeration Applications
Section: Chapter Questions
Problem 15RQ: Why is two-stage compression popular for extra-low-temperature refrigeration systems?
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At the steam power plant, the superheated steam from boiler is expanded through turbine from initial pressure p₁ = 70 bar and temperature T₁ = 487 °C to pressure of condenser p₂ = 18 kPa. The isentropic efficiency of the turbine ns is 80.0%. The mass flow rate of the steam qm is 140 kg/s. Fuel power is 429 MW. After condenser, the working fluid is saturated water. Boiler efficiency is 90.0%, pump efficiency is 81.0 %, mechanical efficiency of the turbine is 96.0%, generator efficiency is 98.0% and auxiliary power efficiency is 97.0%. Boiler 1. Turbine Generator 2. Condenser 4. 3. Feed water pump Read from h,s-chart and calculate: 1. Enthalpy of the superheated steam h kJ/kg (with zero decimal accuracy) 2. Enthalpy of the steam after isentropic expansion s 3. Enthalpy of the steam at the turbine outlet h₂ 4. Turbine power without mechanical losses Pt 5. Steam content at the turbine outlet X2 kJ/kg (with zero decimal accuracy) kJ/kg (with zero decimal accuracy) MW (with one decimal accuracy) (with two decimal accuracy)
Transcribed Image Text:At the steam power plant, the superheated steam from boiler is expanded through turbine from initial pressure p₁ = 70 bar and temperature T₁ = 487 °C to pressure of condenser p₂ = 18 kPa. The isentropic efficiency of the turbine ns is 80.0%. The mass flow rate of the steam qm is 140 kg/s. Fuel power is 429 MW. After condenser, the working fluid is saturated water. Boiler efficiency is 90.0%, pump efficiency is 81.0 %, mechanical efficiency of the turbine is 96.0%, generator efficiency is 98.0% and auxiliary power efficiency is 97.0%. Boiler 1. Turbine Generator 2. Condenser 4. 3. Feed water pump Read from h,s-chart and calculate: 1. Enthalpy of the superheated steam h kJ/kg (with zero decimal accuracy) 2. Enthalpy of the steam after isentropic expansion s 3. Enthalpy of the steam at the turbine outlet h₂ 4. Turbine power without mechanical losses Pt 5. Steam content at the turbine outlet X2 kJ/kg (with zero decimal accuracy) kJ/kg (with zero decimal accuracy) MW (with one decimal accuracy) (with two decimal accuracy)
6. Enthalpy after condenser h3 7. Heat removed by the condenser Q 8. Specific volume of water after condenser v3 9. Enthalpy before boiler h4 kJ/kg (with zero decimal accuracy) MW (with one decimal accuracy) m³/ton (with three decimal accuracy) kJ/kg (with zero decimal accuracy) 10. Power of feed water pump Pp 11. Thermal efficiency of the plant t MW (with two decimal accuracy) % (with one decimal accuracy) 12. Efficiency of electricity production ne % (with zero decimal accuracy)
Transcribed Image Text:6. Enthalpy after condenser h3 7. Heat removed by the condenser Q 8. Specific volume of water after condenser v3 9. Enthalpy before boiler h4 kJ/kg (with zero decimal accuracy) MW (with one decimal accuracy) m³/ton (with three decimal accuracy) kJ/kg (with zero decimal accuracy) 10. Power of feed water pump Pp 11. Thermal efficiency of the plant t MW (with two decimal accuracy) % (with one decimal accuracy) 12. Efficiency of electricity production ne % (with zero decimal accuracy)
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