Saturated liquid water enters a well-insulated pump at 15kPa and is reversibly compressed to 10 MPa....
Saturated liquid water enters a well-insulated pump at 15kPa and is reversibly compressed to 10 MPa. Calculate the specific pump work input for this isentropic compression using three methods:
-
a) Steady flow energy balance, connecting states (1) and (2) using entropy data from the tables
-
b) Reversible flow work equation with the inlet specific volume and the pressure values
-
c) Reversible flow work equation with the average specific volume and the pressure values
Evaluate the percentage error in parts (b) and (c) relative to part (a).
Homework Answers
Add Answer to:
Saturated liquid water enters a well-insulated pump at 15kPa and
is reversibly compressed to 10 MPa....
Saturated liquid at 10 psia enters a pump in a steam power plant. Determine the specific...
Saturated liquid at 10 psia enters a pump in a steam power plant. Determine the specific work with an outlet pressure of 200 psia if isentropic efficiency is (a) 100% and (b) 80%.
Liquid water enters a feedwater heater at inlet 1 with inlet condition ls 15 mpa, 40celcius...
Liquid water enters a
feedwater heater at inlet 1 with inlet condition ls 15 mpa,
40celcius at 60kg/s. Another stream of water in saturated mixture
enters the heater at inlet 2 at temperature of 175 celcius. The
heater operates at steady state and heat transfer to surrounding
can be neglected. At exit 3, saturated liquid flows out at 275 kpa.
Select two different values of mixture quality at inlet 2 between
0.5 and 0.8, and subsequently plot the mass flow...
Liquid water at 120 kPa enters a 7 kW pump where its pressure is raised to...
Liquid water at 120 kPa enters a 7 kW pump where its pressure is raised to 4.7 MPa. If the elevation difference between the exit and the inlet levels is 10 m, determine the highest mass flow rate of liquid water this pump can handle. Neglect the kinetic energy change of water, and take the specific volume of water to be 0.001 m3/kg The highest mass flow rate of liquid water is kg/s
0.1 kg/s of saturated liquid water enters an adiabatic reversible pump at 10 kPa and exits...
0.1 kg/s of saturated liquid water enters an adiabatic reversible pump at 10 kPa and exits at 4 MPa. Calculate the input power required by the pump. Select one: O a. 4 kW O b. -4 kJ/kg O c.4kJ
In an isobaric process, 1 litre of compressed liquid water at p 10 MPa, T 40°C...
In an isobaric process, 1 litre of compressed liquid water at p 10 MPa, T 40°C is heated to saturated liquid state (State 2), then evaporated to saturated vapor state (State 3), and then further heated to T4-450°C. Determine temperature, pressure, specific volume, internal energy, enthalpy and entropy in the four states; collect the data in a table. Then determine the work and the heat for the process. For state 1, also use the approximation based on saturation data to...
Compressing a substance in the Liquid versus Gas Phases EXAMPLE 7-12 Determine the compressor work input...
Compressing a substance in the Liquid versus Gas Phases EXAMPLE 7-12 Determine the compressor work input required to compress steam isentropi- cally from 100 kPa to 1 MPa, assuming that the steam exists as (a) satu- T rated liquid and (b) saturated vapor at the inlet state. SOLUTION Steam is to be compressed from a given pressure to a specified pressure isentropically. The work input is to be determined for the cases of steam being a saturated liquid and saturated...
Question 4 Liquid water enters a feedwater heater at inlet 1 with inlet conditions 15 MPa,...
Question 4 Liquid water enters a feedwater heater at inlet 1 with inlet conditions 15 MPa, 40°C at 60 kg/s. Another stream of water in saturated mixture enters the heater at inlet 2 at temperature of 175 °C. The heater operates at steady state and heat transfer to surrounding can be neglected. At exit 3, saturated liquid flows out at 275 kPa. Select two (2) different values of mixture quality at inlet 2 between 0.5 and 0.8, and subsequently plot...
In a steam power plant, water is pressurized in an adiabatic pump from 100kPa as a saturated liqu...
In a steam power plant, water is pressurized in an adiabatic pump from 100kPa as a saturated liquid to 5 MPa at 150C. The pump is directly driven by an adiabatic steam turbine, which also powers a generator. Steam enters the steam turbine at 5 MPa and 450C and leaves as saturated vapor at 100kPa. Determine the net-work output of the pump-turbine-generator combination if the generator operates at 85% efficiency. (in kJ/kg) ) b) Determine the entropy generation for both...
1 MPa Isentropic Efficiency of a Compressor Refrigerant-134a enters an adiabatic compressor as a saturated vapor...
1 MPa Isentropic Efficiency of a Compressor Refrigerant-134a enters an adiabatic compressor as a saturated vapor at 100kPa at a rate of 0.7 m/min and exits at 1-MPa pressure. The isentropic efficiency of the compressor is 87%. R-134a Compressor Isentropic Compressor Work hs-h 100 kPa sat. vapor Actual Compressor Work Determine the refrigerant properties at the inlet and outlet for an isentropic process. Actual 2s entropic procEss Inlet state Determine the actual isentropic enthalpy from the efficiency. (Ans: 289.71 J/kg)...
(a) An insulated piston cylinder device contains 5 L of saturated liquid water at a constant...
(a) An insulated piston cylinder device contains 5 L of saturated liquid water at a constant pressure of 150 kPa. The cylinder was equipped with the electric heater inside it. The liquid is heated at constant pressure until it becomes saturated vapour. Determine the entropy change of the water during this process in kJ/K. (10 Marks) (b) A stream of refrigerant R134a enters a steady flow device at 100 kPa, 50 °C at a rate of 1 kg/s. Two streams...
Liquid water enters a
feedwater heater at inlet 1 with inlet condition ls 15 mpa,
40celcius at 60kg/s. Another stream of water in saturated mixture
enters the heater at inlet 2 at temperature of 175 celcius. The
heater operates at steady state and heat transfer to surrounding
can be neglected. At exit 3, saturated liquid flows out at 275 kpa.
Select two different values of mixture quality at inlet 2 between
0.5 and 0.8, and subsequently plot the mass flow...
Liquid water at 120 kPa enters a 7 kW pump where its pressure is raised to 4.7 MPa. If the elevation difference between the exit and the inlet levels is 10 m, determine the highest mass flow rate of liquid water this pump can handle. Neglect the kinetic energy change of water, and take the specific volume of water to be 0.001 m3/kg The highest mass flow rate of liquid water is kg/s
0.1 kg/s of saturated liquid water enters an adiabatic reversible pump at 10 kPa and exits at 4 MPa. Calculate the input power required by the pump. Select one: O a. 4 kW O b. -4 kJ/kg O c.4kJ
In an isobaric process, 1 litre of compressed liquid water at p 10 MPa, T 40°C is heated to saturated liquid state (State 2), then evaporated to saturated vapor state (State 3), and then further heated to T4-450°C. Determine temperature, pressure, specific volume, internal energy, enthalpy and entropy in the four states; collect the data in a table. Then determine the work and the heat for the process. For state 1, also use the approximation based on saturation data to...
Compressing a substance in the Liquid versus Gas Phases EXAMPLE 7-12 Determine the compressor work input required to compress steam isentropi- cally from 100 kPa to 1 MPa, assuming that the steam exists as (a) satu- T rated liquid and (b) saturated vapor at the inlet state. SOLUTION Steam is to be compressed from a given pressure to a specified pressure isentropically. The work input is to be determined for the cases of steam being a saturated liquid and saturated...
Question 4 Liquid water enters a feedwater heater at inlet 1 with inlet conditions 15 MPa, 40°C at 60 kg/s. Another stream of water in saturated mixture enters the heater at inlet 2 at temperature of 175 °C. The heater operates at steady state and heat transfer to surrounding can be neglected. At exit 3, saturated liquid flows out at 275 kPa. Select two (2) different values of mixture quality at inlet 2 between 0.5 and 0.8, and subsequently plot...
In a steam power plant, water is pressurized in an adiabatic pump from 100kPa as a saturated liquid to 5 MPa at 150C. The pump is directly driven by an adiabatic steam turbine, which also powers a generator. Steam enters the steam turbine at 5 MPa and 450C and leaves as saturated vapor at 100kPa. Determine the net-work output of the pump-turbine-generator combination if the generator operates at 85% efficiency. (in kJ/kg) ) b) Determine the entropy generation for both...
1 MPa Isentropic Efficiency of a Compressor Refrigerant-134a enters an adiabatic compressor as a saturated vapor at 100kPa at a rate of 0.7 m/min and exits at 1-MPa pressure. The isentropic efficiency of the compressor is 87%. R-134a Compressor Isentropic Compressor Work hs-h 100 kPa sat. vapor Actual Compressor Work Determine the refrigerant properties at the inlet and outlet for an isentropic process. Actual 2s entropic procEss Inlet state Determine the actual isentropic enthalpy from the efficiency. (Ans: 289.71 J/kg)...
(a) An insulated piston cylinder device contains 5 L of saturated liquid water at a constant pressure of 150 kPa. The cylinder was equipped with the electric heater inside it. The liquid is heated at constant pressure until it becomes saturated vapour. Determine the entropy change of the water during this process in kJ/K. (10 Marks) (b) A stream of refrigerant R134a enters a steady flow device at 100 kPa, 50 °C at a rate of 1 kg/s. Two streams...
Most questions answered within 3 hours.
-
Where is the error in this code sequence?
String s1 = "Hello";
String s2 = "ello";...
asked 11 months ago -
Financial data for Joel de Paris, Inc., for last year
follow:
Joel de Paris, Inc.
Balance...
asked 11 months ago -
Consider this reaction:
Al2(SO4)3 (aq)+ BaCl3
(aq) Al2Cl6 (aq)- +
3BaSO4(s) . What is the...
asked 11 months ago -
Suppose that Savneet is considering increasing her
recent random sample from 20 car rentals to 40...
asked 11 months ago -
Trucks arrive at an unloading terminal at an average rate of 120
per hour.
Trucks arrive...
asked 11 months ago -
Why are methanol and ethanol completely soluble in water while
octanol is not very little soluble....
asked 11 months ago -
A facilities manager at a university reads in a research report
that the mean amount of...
asked 11 months ago -
When the CuSO4 is rehydrated by adding water to the anhydrous
compound, is this an endothermic...
asked 11 months ago -
A ray of sunlight is passing from diamond into crown glass; the
angle of incidence is...
asked 11 months ago -
A block of mass 0.249 kg is placed on top of a light, vertical
spring of...
asked 11 months ago -
how do the kidneys compensate in the presences of acidosis
a) trigger hyperventilate
b) reserve acid...
asked 11 months ago -
Question 501 pts
The rental rate of capital to the firm increases. Which of the
following...
asked 11 months ago