Homework Answers
The Coefficient of performance of a reversible refrigeration cycle is greater than irreversible cycle working between same thermal reservoirs because losses are not there in reversible cycle and work input is minimum.
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the coefficient of performance of an irreversible The coefficient of performance of a reversible refrigeration cycle...
4.A reversible refrigeration cycle operates between cold and hot reservoirs at temperatures TC and TH, respectively....
4.A reversible refrigeration cycle operates between cold and hot reservoirs at temperatures TC and TH, respectively. If the coefficient of performance is 3.3 and TH = 75°F, determine TC, in °F. 5.A reversible refrigeration cycle operates between cold and hot reservoirs at temperatures TC and TH, respectively. If TC = -26°C and TH = 40°C, determine the coefficient of performance.
Problem 1: Two reversible refrigeration cycles are arranged in series. The first cycle receives energy by...
Problem 1: Two reversible refrigeration cycles are arranged in series. The first cycle receives energy by heat transfer from a cold reservoir at temperature Tc and rejects energy by heat transfer to a reservoir at an intermediate temperature T greater than Te. The second cycle receives energy by heat transfer from the reservoir at temperature T and rejects energy by heat transfer to a higher-temperature reservoir at TH. Obtain an expression for the coefficient of performance of a single reversible...
Data are provided for two reversible refrigeration cycles. One cycle operates between hot and cold reservoirs...
Data are provided for two reversible refrigeration cycles. One cycle operates between hot and cold reservoirs at 27°C and 15°C, respectively. The other cycle operates between the same hot reservoir at 27°C and a cold reservoir at -20°C Weycle, If each refrigerator removes the same amount of energy by heat transfer from its cold reservoir, determineeyclc the ratio of the net work input values of the two cycles. Weycle,2 Weycle,1
Thermo question A reversible power cycle and a reversible heat pump cycle operate between hot and...
Thermo question
A reversible power cycle and a reversible heat pump cycle operate between hot and cold reservoirs at temperature T_H = 1000 degree R and T_C respectively. If the thermal effciency of the power cycle is 60%, determine T_C, in degree R, and the coefficient of performance of the heat pump.
Question 12 PHYSICS 120 (a) Carefully explain the difference between irreversible and reversible processes. Also explain...
Question 12 PHYSICS 120 (a) Carefully explain the difference between irreversible and reversible processes. Also explain what the second law of thermodynamics dictates about reversible processes. (You may find it helpful to compare water freezing at 0 °C and super- cooled water freezing at-5 °C.) [5 marks A heat engine operates with an efficiency n = 0.30 between two energy reservoirs at temperatures of 450 K and 293 K. The engine does 90 J of work per cycle. (b) Draw...
A refrigeration cycle operating has a coefficient of performance B=1.8 for cycle Qout=250KJ. Determine Qin and...
A refrigeration cycle operating has a coefficient of performance B=1.8 for cycle Qout=250KJ. Determine Qin and Wcycle each in KJ.
Thermodynamics MECH 3311 Competency #5 NAME An inventor proposes an actual refrigeration cycle which requires a...
Thermodynamics
MECH 3311 Competency #5 NAME An inventor proposes an actual refrigeration cycle which requires a net power input of 0.7 horsepower to remove 12,000 BTUhr of energy by heat transfer from a reservoir at O"F and discharges energy by beat transfer to a reservoir at 70°F. Assume a steady state cycle a) b) c) Determine the coefficient of performance of the proposed refrigeration cycle Deternine the heat transfer rate of the proposed refrigeration cycle that is discharged to the...
The coefficient of performance-of vapor-compression refrigeration cycles
a) The coefficient of performance-of vapor-compression refrigeration cycles improves when the refrigerant is subcooled before it enters the throttling valve Can the refrigerant be subcooled indefinitely to maximize this effect, or is there a lower limit? Explain brieflyb) A two-stage compression refrigeration system with a flash chamber is used to produce chilled water for a commercial building The refrigeration system operates between a pressure limits of 1 2 MPa and 200 kPa with refrigerant-134a as the working fluid. The refrigerant leaves...
Operating in series are two reversible heat pumps. Heat transfer gives energy to the first cycle...
Operating in series are two reversible heat pumps. Heat transfer
gives energy to the first cycle from a cold reservoir at 105 K and
rejects energy by heat transfer to a reservoir at an intermediate
temperature T greater than 105 K. The second cycle receives energy
by heat transfer from the reservoir at T and rejects energy by heat
transfer to a higher-temperature reservoir at 1200 K. If the heat
pump cycles have the same co-efficient of performance, calculate:
Low...
At steady-state, a refrigeration cycle operating between hot and cold reservoirs at 300 K and 275...
At steady-state, a refrigeration cycle operating between hot and cold reservoirs at 300 K and 275 K, respectively, removes energy by heat transfer from the cold reservoir at a rate of 600 kW. (a) If the coefficient of performance is 4, determine the power input required, in kW (b) Determine the minimum theoretical power required for any such cycle.
Problem 1: Two reversible refrigeration cycles are arranged in series. The first cycle receives energy by heat transfer from a cold reservoir at temperature Tc and rejects energy by heat transfer to a reservoir at an intermediate temperature T greater than Te. The second cycle receives energy by heat transfer from the reservoir at temperature T and rejects energy by heat transfer to a higher-temperature reservoir at TH. Obtain an expression for the coefficient of performance of a single reversible...
Data are provided for two reversible refrigeration cycles. One cycle operates between hot and cold reservoirs at 27°C and 15°C, respectively. The other cycle operates between the same hot reservoir at 27°C and a cold reservoir at -20°C Weycle, If each refrigerator removes the same amount of energy by heat transfer from its cold reservoir, determineeyclc the ratio of the net work input values of the two cycles. Weycle,2 Weycle,1
Thermo question
A reversible power cycle and a reversible heat pump cycle operate between hot and cold reservoirs at temperature T_H = 1000 degree R and T_C respectively. If the thermal effciency of the power cycle is 60%, determine T_C, in degree R, and the coefficient of performance of the heat pump.
Question 12 PHYSICS 120 (a) Carefully explain the difference between irreversible and reversible processes. Also explain what the second law of thermodynamics dictates about reversible processes. (You may find it helpful to compare water freezing at 0 °C and super- cooled water freezing at-5 °C.) [5 marks A heat engine operates with an efficiency n = 0.30 between two energy reservoirs at temperatures of 450 K and 293 K. The engine does 90 J of work per cycle. (b) Draw...
Thermodynamics
MECH 3311 Competency #5 NAME An inventor proposes an actual refrigeration cycle which requires a net power input of 0.7 horsepower to remove 12,000 BTUhr of energy by heat transfer from a reservoir at O"F and discharges energy by beat transfer to a reservoir at 70°F. Assume a steady state cycle a) b) c) Determine the coefficient of performance of the proposed refrigeration cycle Deternine the heat transfer rate of the proposed refrigeration cycle that is discharged to the...
Operating in series are two reversible heat pumps. Heat transfer
gives energy to the first cycle from a cold reservoir at 105 K and
rejects energy by heat transfer to a reservoir at an intermediate
temperature T greater than 105 K. The second cycle receives energy
by heat transfer from the reservoir at T and rejects energy by heat
transfer to a higher-temperature reservoir at 1200 K. If the heat
pump cycles have the same co-efficient of performance, calculate:
Low...
At steady-state, a refrigeration cycle operating between hot and cold reservoirs at 300 K and 275 K, respectively, removes energy by heat transfer from the cold reservoir at a rate of 600 kW. (a) If the coefficient of performance is 4, determine the power input required, in kW (b) Determine the minimum theoretical power required for any such cycle.
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