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) the exergy destruction for this process per unit mass of the feed-water, (c) Investigate the effect of the state of the steam at the inlet of the feed-water heater on the ratio of mass flow rates and the exergy destruction. Vary the extracted steam pressure as: 200 kPa, 600 kPa, 1 MPa, 1.4 MPa and 2 MPa. Plot both the ratio of the mass flow rates of the extracted steam and the feed-water heater and the exergy destruction for this process per unit mass of feed-water as functions of the extraction pressure.
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Problem 1 In large steam power plants, the feedwater is frequently heated in closed feedwater heaters...
Problem 1 In large steam power plants, the feedwater is frequently heated in closed feedwater heaters (basically heat exchangers) by steam extracted from the turbine at some stage. Steam enters the feedwater heater at 1 MPa and 200°C and leaves as saturated liquid at the same pressure. Feed water enters the heater at 2.5 MPa and 50°C and leaves at 10°C below the exit temperature of the steam. Neglecting any heat losses from the outer surfaces of the heater, determine...
Consider an ideal steam regenerative cycle in which steam enters the turbine at 3.0 MPa, 400°C,...
Consider an ideal steam regenerative cycle in which steam enters the turbine at 3.0 MPa, 400°C, and exhausts to the condenser at 10 kPa. Steam is extracted from the turbine at 0.8 MPa to an open feedwater heater. The feed water leaves the heater as saturated liquid. The appropriate pumps are used for 2 the water leaving the condenser and the feed-water heater. Calculate (a) the thermal efficiency of the cycle, (b) the net work per kilogram of steam, and...
Homework 2 Problem 1: A piston-cylinder device initially contains 0.35-kg steam at 3.5 MPa, superheated by...
Homework 2 Problem 1: A piston-cylinder device initially contains 0.35-kg steam at 3.5 MPa, superheated by 7.4 C. Now the stream loses heat to the surroundings and the piston moves down, hitting a set of stops at which point the cylinder contains saturated liquid water. The cooling continues until the cylinder contains water at 200C. Determine (a) the final pressure and the quality (if mixture), (b) the boundary work, (c) the amount of heat transfer when the piston first hits...
In a regenerative ideal Rankine cycle, hot water steam enters the turbine at 10 MPa and...
In a regenerative ideal Rankine cycle, hot water steam enters the turbine at 10 MPa and 480°C. condenser inlet pressure is 10 kPa. Some steam is taken from the turbine at a pressure of 0.7 MPa, feeds a Closed Feed water heater and is sent to the condenser as a saturated liquid at a pressure of 0.7 MPa at the outlet. The other outlet (cold) is at a pressure of 10 MPa and a saturation temperature of 0.7 MPa. According...
precise le quality 4) Determine the fraction m of the extracted steam from the turbine HPT...
precise le quality 4) Determine the fraction m of the extracted steam from the turbine HPT 5) What is the overall thermal efficiency of this cycle? Exercise 13: A steam power plant operates on the reheat-regenerative Rankine cycle with closed feed-water heater. Steam enters the turbine at 12.5 MPa and 550°C at a rate of 24kg/s and is condensed in the condenser at a pressure of 20 kPa. Steam is reheated at 5 MPa to 550°C. some steam is extracted...
Consider a reheat-regenerative vapor power cycle with two feedwater heaters, a closed feedwater heater and an...
Consider a reheat-regenerative vapor power cycle with two feedwater heaters, a closed feedwater heater and an open feedwater heater. Steam enters the first turbine at 8.0 MPa, 480 C and expands to 0.7 MPa. The steam is reheated to 440°C before entering the second turbine, where it expands to the condenser pressure of 0.008 MPa Steam is extracted from the first turbine at 2 MPa and fed to the closed feedwater heater. Feedwater leaves the closed heater at 205 C...
a) A steam power plant operates on an ideal reheat-regenerative Rankine cycle. Steam enters the high-pressure...
a) A steam power plant operates on an ideal reheat-regenerative Rankine cycle. Steam enters the high-pressure turbine (HPT) at a pressure of 10 MPa and temperature of 550°C. The steam expands through the HPT stage to a pressure of 0.6 MPa. Some of the steam at the end of the expansion process in HPT is extracted for a regeneration process in a closed-type feedwater heater. The steam leaves the heater as a saturated liquid and then is throttled to the...
8.55 ULUS 8.53. but include in the s an isentropic efficiency 8.54 Reconsider the cycle o...
8.55
ULUS 8.53. but include in the s an isentropic efficiency 8.54 Reconsider the cycle o f lem 852 L analysis that each turbine e has an isentre of 88% and each pump an siciency of 80%. unkine cycle of Problem 8.9 to include r heater using extracted steam extracted steam at exiting the heater as saturated liquid ough a trap into the condenser. The neater at 11 MPa and a temperature temperature at 690 kPa. The mass ring the...
Consider a steam power plant that operates on an ideal regenerative rankine cycle
Consider a steam power plant that operates on an ideal regenerative rankine cycle. Steam enters turbine at 6 MPa and 450 deg and is condensed in the condenser at 20 kPa. Bleed Steam is extracted from the turbine at 0.4 MPa to heat the boiler feed-water in an open feed-water heater, water leaves the feed water heater as a saturated liquid. Construct a property table giving the pressure, enthalpy and phase for all the state points identified in the cycle...
In large steam power plants, the feedwater is frequently heated in a closed feedwater heater by...
In large steam power plants, the feedwater is frequently heated in a closed feedwater heater by using steam extracted from the turbine at some stage. Steam enters the feedwater heater at 1 MPa and 215°C and leaves as saturated liquid at the same pressure. Feedwater enters the heater at 2.5 MPa and 50°C and leaves at 10°C below the exit temperature of the steam. Determine the ratio of the mass flow rates of the extracted steam and the feedwater. The...
Problem 1 In large steam power plants, the feedwater is frequently heated in closed feedwater heaters (basically heat exchangers) by steam extracted from the turbine at some stage. Steam enters the feedwater heater at 1 MPa and 200°C and leaves as saturated liquid at the same pressure. Feed water enters the heater at 2.5 MPa and 50°C and leaves at 10°C below the exit temperature of the steam. Neglecting any heat losses from the outer surfaces of the heater, determine...
Homework 2 Problem 1: A piston-cylinder device initially contains 0.35-kg steam at 3.5 MPa, superheated by 7.4 C. Now the stream loses heat to the surroundings and the piston moves down, hitting a set of stops at which point the cylinder contains saturated liquid water. The cooling continues until the cylinder contains water at 200C. Determine (a) the final pressure and the quality (if mixture), (b) the boundary work, (c) the amount of heat transfer when the piston first hits...
In a regenerative ideal Rankine cycle, hot water steam enters the turbine at 10 MPa and 480°C. condenser inlet pressure is 10 kPa. Some steam is taken from the turbine at a pressure of 0.7 MPa, feeds a Closed Feed water heater and is sent to the condenser as a saturated liquid at a pressure of 0.7 MPa at the outlet. The other outlet (cold) is at a pressure of 10 MPa and a saturation temperature of 0.7 MPa. According...
precise le quality 4) Determine the fraction m of the extracted steam from the turbine HPT 5) What is the overall thermal efficiency of this cycle? Exercise 13: A steam power plant operates on the reheat-regenerative Rankine cycle with closed feed-water heater. Steam enters the turbine at 12.5 MPa and 550°C at a rate of 24kg/s and is condensed in the condenser at a pressure of 20 kPa. Steam is reheated at 5 MPa to 550°C. some steam is extracted...
Consider a reheat-regenerative vapor power cycle with two feedwater heaters, a closed feedwater heater and an open feedwater heater. Steam enters the first turbine at 8.0 MPa, 480 C and expands to 0.7 MPa. The steam is reheated to 440°C before entering the second turbine, where it expands to the condenser pressure of 0.008 MPa Steam is extracted from the first turbine at 2 MPa and fed to the closed feedwater heater. Feedwater leaves the closed heater at 205 C...
a) A steam power plant operates on an ideal reheat-regenerative Rankine cycle. Steam enters the high-pressure turbine (HPT) at a pressure of 10 MPa and temperature of 550°C. The steam expands through the HPT stage to a pressure of 0.6 MPa. Some of the steam at the end of the expansion process in HPT is extracted for a regeneration process in a closed-type feedwater heater. The steam leaves the heater as a saturated liquid and then is throttled to the...
8.55
ULUS 8.53. but include in the s an isentropic efficiency 8.54 Reconsider the cycle o f lem 852 L analysis that each turbine e has an isentre of 88% and each pump an siciency of 80%. unkine cycle of Problem 8.9 to include r heater using extracted steam extracted steam at exiting the heater as saturated liquid ough a trap into the condenser. The neater at 11 MPa and a temperature temperature at 690 kPa. The mass ring the...
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