1. Consider a Carnot cycle where Th=1000. K and Tc=300. K. The heat absorbed, qh, is...
1. Consider a Carnot cycle where Th=1000. K and Tc=300. K. The heat absorbed, qh, is 200. kJ. What is the entropy change for the entire cycle?
2. Consider a Carnot cycle where Th=1000. K and Tc=300. K. The heat absorbed, qh, is 200. kJ. What is the entropy change for the adiabatic expansion?
3. Consider a Carnot cycle where Th=1000. K and Tc=300. K. The heat absorbed, qh, is 200. kJ. What is the entropy change during the isothermal expansion at 1000. K?
4. Consider a Carnot cycle where Th=1000. K and Tc=300. K. The heat absorbed, qh, is 200. kJ. What is the entropy change during the isothermal compression?
Homework Answers
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1. Consider a Carnot cycle where Th=1000. K and Tc=300. K. The
heat absorbed, qh, is...
Air in a piston-cylinder assembly executes a Carnot power cycle (4 internally reversible processes, shown in...
Air in a piston-cylinder assembly executes a Carnot power cycle (4 internally reversible processes, shown in the figure below). The isothermal expansion and compression processes occur at TH 1400 K and Tc-350 K, respectively. The pressure at the beginning and end of the isothermal compression are p4-100 kPa and pi - 500 kPa, respectively Assume the ideal gas model for the air: ai 0.717 J/g.K Mair- 28.97 g/mol kpv.air 1.4 R 8.314J /(mol K) Adiabatic Isothermal expansion Adiabatic compression Gas...
Consider a Carnot cycle starting at the state of highest pressure and smallest volume. Call the...
Consider a Carnot cycle starting at the state of highest pressure and smallest volume. Call the isothermal expansion that starts at this state step 1, the adiabatic expansion which follows step 2, the isothermal compression that then follows step 3, and the adiabatic compression which returns the system to the initial state step 4. In which step does the entropy of the system increase?
A power cycle operating between two thermal reservoirs receives energy QH by heat transfer from a...
A power cycle operating between two thermal reservoirs receives energy QH by heat transfer from a hot reservoir at TH = 2000 K and rejects energy QC by heat transfer to a cold reservoir at TC = 400 K. For each of the following cases determine whether the cycle operates reversibly, operates irreversibly, or is impossible. (a) QH = 1000 kJ, ƞ = 60% (b) QH = 1000 kJ, Wcycle = 850 kJ (c) QH = 1000 kJ, QC =...
As shown in the figure, a reversible power cycle receives energy QH by heat transfer from...
As shown in the figure, a reversible power cycle receives energy
QH by heat transfer from a hot reservoir at TH and rejects energy
QC by heat transfer to a cold reservoir at TC.
a) If TH = 1600 K, TC = 400 K, what is the thermal
efficiency?
b) If TH = 500oC, TC = 20oC, and Wcycle = 1000 kJ, what are QH and
QC, each in kJ?
c) If ? = 60% and TC = 40oF, what...
3. (20 pts) In the Carnot engine (refer to the figure in question 2), an ideal...
3. (20 pts) In the Carnot engine (refer to the figure in question 2), an ideal gas undergoes a cycle of isothermal expansion (A → B), adiabatic expansion (B → C), isothermal compression (C → D), and adiabatic compression (D → A). All processes are assumed to be reversible. The volumes at the points are given that 2VA=VB and VC=2VD. Th is 650 °C and Tc is 30 °C. (1) Calculate the amount of heat added to one mole gas...
2. An ideal gas within a piston-cylinder assembly executes a Carnot power cycle. The isothermal compression...
2. An ideal gas within a piston-cylinder assembly executes a Carnot power cycle. The isothermal compression occurs at 300 K from 80 kPa to 110 kPa. If the thermal efficiency is 70% determine (30 points): P a. the temperature of the isothermal expansion, in K, and b. the network developed, in kJ per kmol of gas. Jooote Nmax = 1 - - - TW TA 70%=1-300x TA = 300 kdy cokela TH TH= loook - +10 A = With I...
Question 5 (10 points) Air within a piston-cylinder assembly executes a Carnot heat pump cycle. For...
Question 5 (10 points) Air within a piston-cylinder assembly executes a Carnot heat pump cycle. For the cycle, Th = 325 C and Tc = {TC) C. The thermal energy produced by the engine has a magnitude of 200 kJ per kg of air. The pressure at the start of the isothermal expansion is 325 kPa. Determine the magnitude of the net work input, in kJ per kg of air. Your Answer: Answer
3. In a Carnot cycle, the isothermal expansion of an ideal gas takes place at 410...
3. In a Carnot cycle, the isothermal expansion of an ideal gas takes place at 410 K and the isothermal compression at 320 K. During the expansion 600 J of heat energy are transferred to the gas. Determine (a) the work performed by the gas during the cycle, () the heat transferred to the cooler, (c) the efficiency of the cycle
Problem 2:2* (Carnot Cycle Application) Two kilograms of air within a piston-cylinder assembly execute a Carnot...
Problem 2:2* (Carnot Cycle Application) Two kilograms of air within a piston-cylinder assembly execute a Carnot power cycle with maximum and minimum temperatures of 750 K and 300 K, respectively. The heat transfer to the air during the isothermal expansion is 60 kJ. At the end of the isothermal expansion, the pressure is 600 kPa. Assuming the ideal gas model for the air, determine (a) The thermal efficiency. (b) The Pressure and volume at the beginning of the isothermal expansion,...
1. A Carnot cycle receives 1000 kJ of heat at 800 ºC and rejects heat at...
1. A Carnot cycle receives 1000 kJ of heat at 800 ºC and rejects heat at 300 ºC. Calculate the work output. 2. Steam enters an adiabatic turbine at 7MPa and 600 ◦C and leaves at a pressure of 400 kPa. Determine the maximum amount of work that can be delivered by the turbine.
Air in a piston-cylinder assembly executes a Carnot power cycle (4 internally reversible processes, shown in the figure below). The isothermal expansion and compression processes occur at TH 1400 K and Tc-350 K, respectively. The pressure at the beginning and end of the isothermal compression are p4-100 kPa and pi - 500 kPa, respectively Assume the ideal gas model for the air: ai 0.717 J/g.K Mair- 28.97 g/mol kpv.air 1.4 R 8.314J /(mol K) Adiabatic Isothermal expansion Adiabatic compression Gas...
As shown in the figure, a reversible power cycle receives energy
QH by heat transfer from a hot reservoir at TH and rejects energy
QC by heat transfer to a cold reservoir at TC.
a) If TH = 1600 K, TC = 400 K, what is the thermal
efficiency?
b) If TH = 500oC, TC = 20oC, and Wcycle = 1000 kJ, what are QH and
QC, each in kJ?
c) If ? = 60% and TC = 40oF, what...
2. An ideal gas within a piston-cylinder assembly executes a Carnot power cycle. The isothermal compression occurs at 300 K from 80 kPa to 110 kPa. If the thermal efficiency is 70% determine (30 points): P a. the temperature of the isothermal expansion, in K, and b. the network developed, in kJ per kmol of gas. Jooote Nmax = 1 - - - TW TA 70%=1-300x TA = 300 kdy cokela TH TH= loook - +10 A = With I...
Question 5 (10 points) Air within a piston-cylinder assembly executes a Carnot heat pump cycle. For the cycle, Th = 325 C and Tc = {TC) C. The thermal energy produced by the engine has a magnitude of 200 kJ per kg of air. The pressure at the start of the isothermal expansion is 325 kPa. Determine the magnitude of the net work input, in kJ per kg of air. Your Answer: Answer
3. In a Carnot cycle, the isothermal expansion of an ideal gas takes place at 410 K and the isothermal compression at 320 K. During the expansion 600 J of heat energy are transferred to the gas. Determine (a) the work performed by the gas during the cycle, () the heat transferred to the cooler, (c) the efficiency of the cycle
Problem 2:2* (Carnot Cycle Application) Two kilograms of air within a piston-cylinder assembly execute a Carnot power cycle with maximum and minimum temperatures of 750 K and 300 K, respectively. The heat transfer to the air during the isothermal expansion is 60 kJ. At the end of the isothermal expansion, the pressure is 600 kPa. Assuming the ideal gas model for the air, determine (a) The thermal efficiency. (b) The Pressure and volume at the beginning of the isothermal expansion,...
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