A vapor- compression heat pump uses ammonia to provide heat with a geothermal source of heat...
A vapor- compression heat pump uses ammonia to provide heat with a geothermal source of heat at 50oF. The heat pump condenser operates at 72oF while the evaporator is at 48oF. Assuming an ideal dry compression cycle and for a heating of 7 tons (refrigeration unit) determine the power required of the compressor and the flow rate of ammonia.
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A vapor- compression heat pump uses ammonia to provide heat with
a geothermal source of heat...
Refrigerant 134a flows through an ideal vapor compression heat pump system with a heating capacity of...
Refrigerant 134a flows through an ideal vapor compression heat pump system with a heating capacity of 60,000 Btu/hr. The condenser operates at 200 psi, and the evaporator temperature is 0°F. The refrigerant is a saturated vapor at the evaporator exit and a saturated liquid at the condenser exit. The temperature at the compressor exit is 180°F. Assuming the compressor is not 100% isentropic, determine: a) Mass flow rate (lbm/min) b) Compressor power (hp) c) Isentropic compressor efficiency d) Coefficient of...
2. (10 points) An ideal vapor-compression refrigeration cycle is modified to include a counter- flow heat...
2. (10 points) An ideal vapor-compression refrigeration cycle is modified to include a counter- flow heat exchanger, as shown below. Ammonia leaves the evaporator as saturated vapor at 1.0 bar and is heated at constant pressure to 5 "C before entering the compressor. Following isentropic compression to 18 bar, the refrigerant passes through the condenser, exiting at 40 C, 18 bar. The liquid then passes through the heat exchanger, entering the expansion valve at 18 bar. If the mass flow...
In a vapor-compression refrigeration cycle, ammonia exits the evaporator as saturated vapor at -22 °C. There...
In a vapor-compression refrigeration cycle, ammonia exits the
evaporator as saturated vapor at -22 °C. There are
irreversibilities in the compressor. The refrigerant enters the
condenser at 16 bar and 160 °C, and saturated liquid exits at 16
bar. There is no significant heat transfer between the compressor
and its surroundings, and the refrigerant passes through the
evaporator with a negligible change in pressure.
Calculate the coefficient of performance, b, and the isentropic
compressor efficiency, defined as:
2s Condenser Expansion...
Condenser Compressor An ideal vapor-compression refrigeration cycle is modified to include a counter-flow heat exchanger as...
Condenser Compressor An ideal vapor-compression refrigeration cycle is modified to include a counter-flow heat exchanger as shown. Refrigerant 134a leaves the evaporator as saturated vapor at 0.10 MPa and is heated at constant pressure to 20°C before entering the compressor. Following isentropic compression to 1.4 MPa, the refrigerant passes through the condenser and exits at 45°C and 1.4 MPa. The liquid then passes through the heat exchanger and enters the expansion valve at 1.4 MPa. The mass flow rate of...
QUESTION 3 A heat pump that operates on the ideal vapor compression cycle with refrigerant-134a is...
QUESTION 3 A heat pump that operates on the ideal vapor compression cycle with refrigerant-134a is used to heat water from 15°C to 45°C at a rate of 0.12 kg/s. the condenser and evaporator pressures are 1.4 and 0.32 MPa, respectively Determine: (a) The power input to the heat pump
QUESTION 3 A heat pump that operates on the ideal vapor compression cycle with refrigerant-134a is used to heat water from 15°C to 45°C at a rate of 0.12 kg/s....
A vapor-compression heat pump system uses Refrigerant R-134a as the working fluid. The refrigerant enters the...
A vapor-compression heat pump system uses Refrigerant R-134a as the working fluid. The refrigerant enters the compressor at 2.0bar, -5degC and with a mass-flow rate of 26g/s. Compression is adiabatic to 11.6bar, 60degC and the refrigerant exits the condenser 8degC sub-cooled. a) Draw a P-h chart to visualise the refrigeration cycle and display known data. b) Determine the power input to the compressor in kW c) Determine the heating capacity of the system in kW d) Determine the coefficient of...
Problem #1 [30 Points] Vapor Compression Refrigeration Cycle An ideal vapor compression refrigeration system cycle, with...
Problem #1 [30 Points] Vapor Compression Refrigeration Cycle An ideal vapor compression refrigeration system cycle, with ammonia as the working fluid, has an evaporator temperature of -20°C and a condenser pressure of 12 bar. Saturated vapor enters the compressor, and saturated liquid exits the condenser. The mass flow rate of refrigerant is 3 kg/minute. Determine the coefficient of performance and the refrigerating capacity in tons. Given: Find: T-s Process Diagram: Schematic Assume:
A heat pump uses R-134a as the working fluid and operates on an ideal vapor-compression refrigeration...
A heat pump uses R-134a as the working fluid and operates on an ideal vapor-compression refrigeration cycle between 25 psia and 140 psia. Determine (on a per unit mass basis) the heat transfer rates, the power required, and the COP.
A heat pump uses R-134a as the working fluid and operates on an ideal vapor-compression refrigeration...
A heat pump uses R-134a as the working fluid and operates on an ideal vapor-compression refrigeration cycle between 26 psia and 138 psia. Determine (on a per unit mass basis) (a) the amount of heat transferred from the refrigerated space, (b) the amount of heat rejected by the cycle, (c) the work input required by the compressor, (d) the quality at the exit of the throttle valve, and (e) and the COP.
Refrigerant 134a flows through an ideal vapor compression heat pump system with a heating capacity of 60,000 Btu/hr. The condenser operates at 200 psi, and the evaporator temperature is 0°F. The refrigerant is a saturated vapor at the evaporator exit and a saturated liquid at the condenser exit. The temperature at the compressor exit is 180°F. Assuming the compressor is not 100% isentropic, determine: a) Mass flow rate (lbm/min) b) Compressor power (hp) c) Isentropic compressor efficiency d) Coefficient of...
2. (10 points) An ideal vapor-compression refrigeration cycle is modified to include a counter- flow heat exchanger, as shown below. Ammonia leaves the evaporator as saturated vapor at 1.0 bar and is heated at constant pressure to 5 "C before entering the compressor. Following isentropic compression to 18 bar, the refrigerant passes through the condenser, exiting at 40 C, 18 bar. The liquid then passes through the heat exchanger, entering the expansion valve at 18 bar. If the mass flow...
In a vapor-compression refrigeration cycle, ammonia exits the
evaporator as saturated vapor at -22 °C. There are
irreversibilities in the compressor. The refrigerant enters the
condenser at 16 bar and 160 °C, and saturated liquid exits at 16
bar. There is no significant heat transfer between the compressor
and its surroundings, and the refrigerant passes through the
evaporator with a negligible change in pressure.
Calculate the coefficient of performance, b, and the isentropic
compressor efficiency, defined as:
2s Condenser Expansion...
Condenser Compressor An ideal vapor-compression refrigeration cycle is modified to include a counter-flow heat exchanger as shown. Refrigerant 134a leaves the evaporator as saturated vapor at 0.10 MPa and is heated at constant pressure to 20°C before entering the compressor. Following isentropic compression to 1.4 MPa, the refrigerant passes through the condenser and exits at 45°C and 1.4 MPa. The liquid then passes through the heat exchanger and enters the expansion valve at 1.4 MPa. The mass flow rate of...
QUESTION 3 A heat pump that operates on the ideal vapor compression cycle with refrigerant-134a is used to heat water from 15°C to 45°C at a rate of 0.12 kg/s. the condenser and evaporator pressures are 1.4 and 0.32 MPa, respectively Determine: (a) The power input to the heat pump
QUESTION 3 A heat pump that operates on the ideal vapor compression cycle with refrigerant-134a is used to heat water from 15°C to 45°C at a rate of 0.12 kg/s....
Problem #1 [30 Points] Vapor Compression Refrigeration Cycle An ideal vapor compression refrigeration system cycle, with ammonia as the working fluid, has an evaporator temperature of -20°C and a condenser pressure of 12 bar. Saturated vapor enters the compressor, and saturated liquid exits the condenser. The mass flow rate of refrigerant is 3 kg/minute. Determine the coefficient of performance and the refrigerating capacity in tons. Given: Find: T-s Process Diagram: Schematic Assume:
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