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Determine the exergy destruction associated with the heat rejection process in Prob. 6 of Rankine cycle...
Consider a steam power plant operating on the simple ideal Rankine cycle. Steam enters the turbine at 5 MPa and 500°C and is condensed in the condenser at a pressure of 50 kPa. Heat is supplied to th...
Consider a steam power plant operating on the simple ideal Rankine cycle. Steam enters the turbine at 5 MPa and 500°C and is condensed in the condenser at a pressure of 50 kPa. Heat is supplied to the steam in a furnace maintained at 800 K, and waste heat is rejected to the surroundings at 300 K. Show the cycle on a T-s diagram with respect to saturation lines, and determine (a) the net work output, (b) the thermal efficiency...
#4. An air-standard Diesel cycle has a compression ratio of 16 and a cut-off ratio of...
#4. An air-standard Diesel cycle has a compression ratio of 16 and a cut-off ratio of 2. At the beginning of the compression process, air is at 95 kPa and 27 °C, Taking into account the variation of specific heats with temperature, determine (a) the temperature at the end of the heat-addition process, (b) the pressure and temperature at the end of expansion process, and (c) the total exergy destruction associated with the cycle, assuming a source temperature of 2000...
Exergy
Steam enters a closed feed-water heater at 2 MPa and 300oC and leaves as saturated liquid at the same pressure. On the other side, cold feed-water enters the heater at 3 MPa and 35oC and leaves 10oC below the exit temperature of the steam. Neglect any heat losses from the outer surfaces of the heater and assume the surroundings to be at 25oC. Determine (a) the ratio of the mass flow rates of the extracted steam and the feedwater, (b)...
Problem #2 (30 The steam cycle described in Problem #1 wasted a significant amount of exergy to t...
Problem #2 (30 The steam cycle described in Problem #1 wasted a significant amount of exergy to the cooling water. A real cycle might cascade the energy down to a lower temperature cycle to utilise some of this exergy (regeneration). It might also use the heat to execute an industrial process (cogeneration). The cycle described below does both! inSeam generator Turbine 1.5 bar H20 cycle To industrial process H2OR-134a heat exchanger Turbine Refrigerant cycle R-134a cycle Pump Condenser Pump Return...
2) A Rankine cycle generates steam at 5 MPa and 450°C leaving the boiler and the...
2) A Rankine cycle generates steam at 5 MPa and 450°C leaving the boiler and the turbine exhaust pressure is 7.5 kPa. The adiabatic efficiency of the turbine is 85%, and that of the pump is 70%. Determine (a) the net work in kW. (b) the thermal efficiency for the cycle, c) the change in availability of the steam as it passes through the boiler, and d) the irreversibility for the cycle. You may assume the environment is at 100...
Problem 3. Rankine Cycle (90 points) A steam power plant operates with high pressure of 4 MPa and has a boiler exit at 600°C receiving heat from a 700° C reservoir. The ambient air at 20°C provid...
Problem 3. Rankine Cycle (90 points) A steam power plant operates with high pressure of 4 MPa and has a boiler exit at 600°C receiving heat from a 700° C reservoir. The ambient air at 20°C provides cooling to maintain the water/vapor mixture in the condenser at 60°C. All components are ideal (i.e., reversible) except the turbine which has an efficiency 92% ofa reversible isentropic process. Other than the irreversibility of the turbine, the power plant can be considered as...
A Rankine Cycle based steam power plant produces 200 MW of power. Steam exits the boiler...
A Rankine Cycle based steam power plant produces 200 MW of power. Steam exits the boiler at 3 MPa and 500° C. The turbine exit is at 40 kPa. Isentropic efficiencies of the turbine and pump are 75% and 70% respectively. Show the cycle on a T-s diagram Calculate the mass flow rate of steam Determine the heat transfer rates in the boiler and condenser in MW Determine the cycle efficiency Determine the mass flow rate of the condenser cooling...
3. The Rankine cycle is the ideal cycle for vapor-driven power plants. A Rankine cycle with...
3. The Rankine cycle is the ideal cycle for vapor-driven power plants. A Rankine cycle with water as the working fluid operates between the pressure limits of 4 MPa in the boiler and 20 kPa in the condenser. The turbine inlet temperature is 700°C and the flow rate is 30 kg/s. State the assumptions and show the complete reduction of the governing equations. (Total: 20 pts.) (a) Show the cycle on a T-s diagram. (b) Determine the power produced by...
Consider a steam power plant which operates on the simple ideal Rankine cycle (shown in the...
Consider a steam power plant which operates on the simple ideal
Rankine cycle (shown in the next page), where the boiler pressure
is 3 MPa and the condenser saturation temperature is 50°C. The
temperature at the exit of the boiler is 500°C. Water leaves the
condenser as a saturated liquid. The mass flow rate through each
component is 15 kg/s. Calculate:
1. The power output of the steam power plant
2. The thermal efficiency of the steam power plant
Now,...
Tutorial Questions 1 1. Water is the working fluid in an ideal Rankine cycle. The condenser...
Tutorial Questions 1.1. Water is the working fluid in an ideal Rankine cycle. The condenser pressure is kPa, and saturated vapor enters the turbine at 10 MPa. Determine the heat transfer rates, in kJ per kg of steam flowing, for the working fluid passing through the boiler and condenser and calculate the thermal efficiency.2. Water is the working fluid in an ideal Rankine cycle. Saturated vapor enters the turbine at 16 MPa, and the condenser pressure is 8 kPa ....
Consider a steam power plant operating on the simple ideal Rankine cycle. Steam enters the turbine at 5 MPa and 500°C and is condensed in the condenser at a pressure of 50 kPa. Heat is supplied to the steam in a furnace maintained at 800 K, and waste heat is rejected to the surroundings at 300 K. Show the cycle on a T-s diagram with respect to saturation lines, and determine (a) the net work output, (b) the thermal efficiency...
#4. An air-standard Diesel cycle has a compression ratio of 16 and a cut-off ratio of 2. At the beginning of the compression process, air is at 95 kPa and 27 °C, Taking into account the variation of specific heats with temperature, determine (a) the temperature at the end of the heat-addition process, (b) the pressure and temperature at the end of expansion process, and (c) the total exergy destruction associated with the cycle, assuming a source temperature of 2000...
Problem #2 (30 The steam cycle described in Problem #1 wasted a significant amount of exergy to the cooling water. A real cycle might cascade the energy down to a lower temperature cycle to utilise some of this exergy (regeneration). It might also use the heat to execute an industrial process (cogeneration). The cycle described below does both! inSeam generator Turbine 1.5 bar H20 cycle To industrial process H2OR-134a heat exchanger Turbine Refrigerant cycle R-134a cycle Pump Condenser Pump Return...
2) A Rankine cycle generates steam at 5 MPa and 450°C leaving the boiler and the turbine exhaust pressure is 7.5 kPa. The adiabatic efficiency of the turbine is 85%, and that of the pump is 70%. Determine (a) the net work in kW. (b) the thermal efficiency for the cycle, c) the change in availability of the steam as it passes through the boiler, and d) the irreversibility for the cycle. You may assume the environment is at 100...
Problem 3. Rankine Cycle (90 points) A steam power plant operates with high pressure of 4 MPa and has a boiler exit at 600°C receiving heat from a 700° C reservoir. The ambient air at 20°C provides cooling to maintain the water/vapor mixture in the condenser at 60°C. All components are ideal (i.e., reversible) except the turbine which has an efficiency 92% ofa reversible isentropic process. Other than the irreversibility of the turbine, the power plant can be considered as...
3. The Rankine cycle is the ideal cycle for vapor-driven power plants. A Rankine cycle with water as the working fluid operates between the pressure limits of 4 MPa in the boiler and 20 kPa in the condenser. The turbine inlet temperature is 700°C and the flow rate is 30 kg/s. State the assumptions and show the complete reduction of the governing equations. (Total: 20 pts.) (a) Show the cycle on a T-s diagram. (b) Determine the power produced by...
Consider a steam power plant which operates on the simple ideal
Rankine cycle (shown in the next page), where the boiler pressure
is 3 MPa and the condenser saturation temperature is 50°C. The
temperature at the exit of the boiler is 500°C. Water leaves the
condenser as a saturated liquid. The mass flow rate through each
component is 15 kg/s. Calculate:
1. The power output of the steam power plant
2. The thermal efficiency of the steam power plant
Now,...
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