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Practical steam engines utilize 450°C steam, which is later exhausted at 2709C 7)What is the maximum...
Section V 9. What is the maximum work that can be obtained from 5500 J of heat supplied to a steam engine with a hi...
Section V 9. What is the maximum work that can be obtained from 5500 J of heat supplied to a steam engine with a high temperature reservoir at 150°C if the condenser is at 15°C? (Hint: calculate the efficiency of the steam engine first). 10. In running a Carnot cycle backward to produce refrigeration, the objective is to for a given amount
7. We decide to store 200 MJ of electrical energy by driving a heat pump which...
7. We decide to store 200 MJ of electrical energy by driving a heat pump which transfers heat from 20°C to molten salt at 500°C. This energy is retrieved later by running a heat engine between the same two temperatures. Both the heat pump and the engine can be described by efficiencies WIQH, and they both have the same ideal (Carnot) efficiency. A. What is the ideal efficiency of the heat pump? B. molten salt? Assuming ideal efficiency, how much...
TURBO MACHINES SUBJECT QUESTION 10 A multi-stage high -pressure steam turbine is supplied with steam at a stagnation pressure of 7 MPa and a stagnation temperature of 500°C. The corresponding specifi...
TURBO MACHINES SUBJECT
QUESTION 10 A multi-stage high -pressure steam turbine is supplied with steam at a stagnation pressure of 7 MPa and a stagnation temperature of 500°C. The corresponding specific enthalpy is 3410kJ.kg. The steam exhaust from the turbine at a stagnation pressure of 0.7 MPa abs., the steam having been in a super-heated condition throughout the expansion. It can be assumed that the steam behaves like a perfect gas over the range of the expansion and that v...
.85-120 Thermodynamics Tutorial 3 Problem 1. An inventor claims to have invented 4 engines, each of...
.85-120 Thermodynamics Tutorial 3 Problem 1. An inventor claims to have invented 4 engines, each of which operates between constant-temperature reservoirs of 400 and 300 K. Consider the 1st and 2nd laws of thermodynamics to evaluate the engines. For each engine, state and explain why it does or doesn't violate the 1st and 2nd Laws of Thermo. 1st law hint: Think quantity of work. 2nd Law hint: Think process efficiency. Engine 1 2 3 4 QH (J) 200 500 600...
1. Exhaust gas at 400 C and 1 bar from i engines flows at the rate...
1. Exhaust gas at 400 C and 1 bar from i engines flows at the rate of 125 mol s into a waste-heat boiler where saturated steam in generated at a pressure of 1200 kPa. Water enters the boiler at 20 C (Ta) and the exhaust gases are cooled to within 10°C of the steam temperature. The heat capacity of the exhaust gases is C/R-3.341.12x10 T/K. The steam flows into an adiabatic turbine and exhausts at a pressure of 25...
Second Law of Thermodynamics Learning Goal: To understand the implications of the second law of thermodynamics...
Second Law of Thermodynamics Learning Goal: To understand the implications of the second law of thermodynamics. The second law of thermodynamics explains the direction in which the thermodynamic processes tend to go. That is, it limits the types of final states of the system that naturally evolve from a given initial state. The second law has many practical applications. For example it explains the limits of efficiency for heat engines and refrigerators. To develop a better understanding of this law,...
14. In reference to the two previous questions, let 7. = 800°C and stions, let T...
14. In reference to the two previous questions, let 7. = 800°C and stions, let T = 800°C and T = 50°C. What is the c- Carnot efficiency of this engine? IS. A coal-fired electrical gencrating plant operates at an efficiency of 38%. The temperature of the steam leaving the boiler is 550°C and the temperature of the environment is 20°C. What percentage of the maximum ideal (Carnot) efficiency does that plant attain? _ Show your work: 16. Write down...
pts per question) 1. A 2 m piston cylinder device contains nitroen gas at 200 kPa...
pts per question) 1. A 2 m piston cylinder device contains nitroen gas at 200 kPa and 350K. Now heat is transferred to the nitrogen in the tank and the pressure of nitrogen rises to 900 kPa and volume is maintained at same. The boundary work done during this process is (a) 1080 kJ (b) 840 k (c)240 k 2. A heat engine receives heat from a source at 727°C and rejiects the waste heat to a sink at 27°C,...
Consider a Rankine cycle operating between 1.013 bar and 100 bar with a maximum superheated steam...
Consider a Rankine cycle operating between 1.013 bar and 100 bar
with a maximum superheated steam temperature of 500ºC.
(a) Explain why H2-H1 is approximated as
zero?
(b) Explain why (PV) points within the dashed lines have a set
temperature that is determined by pressure.
(c) How much steam has condensed in the adiabatic cooling step?
Give you answer as a fractional mass.
(d) How much heat per kg is removed by the condenser in 4→1?
(e) How much heat...
5) Which of the following is a false statement? A) Entropy is a quantitative measure of...
5) Which of the following is a false statement? A) Entropy is a quantitative measure of disorder. B) The total entropy change in one cyele of a Camot engine is zero. C) The entropy of an isolated system must be conserved (it remains constant). D) Entropy can be measured in units of /K 6) A compression at a constant pressure of 200 kPa is performed on $.00 moles of an ideal monatomic gas. The compression reduces the volume of the...
Section V 9. What is the maximum work that can be obtained from 5500 J of heat supplied to a steam engine with a high temperature reservoir at 150°C if the condenser is at 15°C? (Hint: calculate the efficiency of the steam engine first). 10. In running a Carnot cycle backward to produce refrigeration, the objective is to for a given amount
7. We decide to store 200 MJ of electrical energy by driving a heat pump which transfers heat from 20°C to molten salt at 500°C. This energy is retrieved later by running a heat engine between the same two temperatures. Both the heat pump and the engine can be described by efficiencies WIQH, and they both have the same ideal (Carnot) efficiency. A. What is the ideal efficiency of the heat pump? B. molten salt? Assuming ideal efficiency, how much...
TURBO MACHINES SUBJECT
QUESTION 10 A multi-stage high -pressure steam turbine is supplied with steam at a stagnation pressure of 7 MPa and a stagnation temperature of 500°C. The corresponding specific enthalpy is 3410kJ.kg. The steam exhaust from the turbine at a stagnation pressure of 0.7 MPa abs., the steam having been in a super-heated condition throughout the expansion. It can be assumed that the steam behaves like a perfect gas over the range of the expansion and that v...
.85-120 Thermodynamics Tutorial 3 Problem 1. An inventor claims to have invented 4 engines, each of which operates between constant-temperature reservoirs of 400 and 300 K. Consider the 1st and 2nd laws of thermodynamics to evaluate the engines. For each engine, state and explain why it does or doesn't violate the 1st and 2nd Laws of Thermo. 1st law hint: Think quantity of work. 2nd Law hint: Think process efficiency. Engine 1 2 3 4 QH (J) 200 500 600...
1. Exhaust gas at 400 C and 1 bar from i engines flows at the rate of 125 mol s into a waste-heat boiler where saturated steam in generated at a pressure of 1200 kPa. Water enters the boiler at 20 C (Ta) and the exhaust gases are cooled to within 10°C of the steam temperature. The heat capacity of the exhaust gases is C/R-3.341.12x10 T/K. The steam flows into an adiabatic turbine and exhausts at a pressure of 25...
14. In reference to the two previous questions, let 7. = 800°C and stions, let T = 800°C and T = 50°C. What is the c- Carnot efficiency of this engine? IS. A coal-fired electrical gencrating plant operates at an efficiency of 38%. The temperature of the steam leaving the boiler is 550°C and the temperature of the environment is 20°C. What percentage of the maximum ideal (Carnot) efficiency does that plant attain? _ Show your work: 16. Write down...
pts per question) 1. A 2 m piston cylinder device contains nitroen gas at 200 kPa and 350K. Now heat is transferred to the nitrogen in the tank and the pressure of nitrogen rises to 900 kPa and volume is maintained at same. The boundary work done during this process is (a) 1080 kJ (b) 840 k (c)240 k 2. A heat engine receives heat from a source at 727°C and rejiects the waste heat to a sink at 27°C,...
Consider a Rankine cycle operating between 1.013 bar and 100 bar
with a maximum superheated steam temperature of 500ºC.
(a) Explain why H2-H1 is approximated as
zero?
(b) Explain why (PV) points within the dashed lines have a set
temperature that is determined by pressure.
(c) How much steam has condensed in the adiabatic cooling step?
Give you answer as a fractional mass.
(d) How much heat per kg is removed by the condenser in 4→1?
(e) How much heat...
5) Which of the following is a false statement? A) Entropy is a quantitative measure of disorder. B) The total entropy change in one cyele of a Camot engine is zero. C) The entropy of an isolated system must be conserved (it remains constant). D) Entropy can be measured in units of /K 6) A compression at a constant pressure of 200 kPa is performed on $.00 moles of an ideal monatomic gas. The compression reduces the volume of the...
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