A two-stage compression refrigeration system with an adiabatic liquid-vapor separation unit uses refrigerant-134a as working fluid....
A two-stage compression refrigeration system with an adiabatic liquid-vapor separation unit uses refrigerant-134a as working fluid. the system operates the evaporator at 0.4Mpa, the condenser at 1.6Mpa and the separator at 0.8 Mpa. The compressors use 25kW of power. Given that the refrigerant is saturated liquid at the inlet of each compressor, and the compressors are isentropic:
i) show the process on a T-s diagram,
ii) calculate the rate of cooling provided by the evaporator, the COP of the heat pump and
iii) determine the COP of this cyc
Homework Answers
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A two-stage compression refrigeration system with an adiabatic
liquid-vapor separation unit uses refrigerant-134a as working
fluid....
A two-stage compression refrigeration system with an adiabatic liquid-vapor separation unit uses refrigerant-134a as working fluid....
A two-stage compression refrigeration system with an adiabatic liquid-vapor separation unit uses refrigerant-134a as working fluid. The system operates the evaporator at 0.4 MPa, the condenser at 1.6 MPa, and the separator at 0.8 MPa. The compressors use 25 kW of power. Given that the refrigerant is saturated liquid at the inlet of each expansion valve and saturated vapor at the inlet of each compressor, and the compressors are isentropic: (0) show the process on a T-s diagram; ) calculate...
A vapor compression refrigeration system operates at steady state with refrigerant 134a as the working fluid....
A vapor compression refrigeration system operates at steady
state with refrigerant 134a as the working fluid. Superheated vapor
enters the compressor at 10 lbf/in2 , 0 oF. The liquid leaving the
condenser is at 180 lbf/in2 , 100 oF. There is no significant
pressure drop in the evaporator or condenser. For compressor
efficiency of 83% and refrigeration capacity of 6 tons,
determine
(a) the compressor power input in horsepower, and
(b) the coefficient of performance.
A vapor compression refrigeration system...
Thermodynamics. No interpolation needed. Problem #3. Refrigerant 134a is the working fluid for vapor-compression refrigeration cycle....
Thermodynamics. No interpolation needed.
Problem #3. Refrigerant 134a is the working fluid for vapor-compression refrigeration cycle. The evaporator temperature is 8°C and the condenser pressure is 12 bar. Saturated vapor enters the compressor and superheated vapor enters the condenser at 60°C and exits the condenser as saturated liquid. For a refrigeration capacity of 8 tons or 2.816 x104 J/s determine the following: (1) The refrigerant mass flow rate in kg/s; (2) The compressor isentropic efficiency [Hint: Interpolation is required); (3)...
1. An industrial freezer uses a multi-stage vapor-compression cycle with R-134a as the working fluid. The...
1. An industrial freezer uses a multi-stage vapor-compression cycle with R-134a as the working fluid. The evaporator operates at 140 kPa, the condenser at 1600 kPa, and the flash chamber 600 kPa. The refrigerant leaves the evaporator as a super-heated vapor at -15°C, and leaves the condenser as a sub-cooled liquid at 50°C. Both compressors used in the system have isentropic efficiencies of 85%. For a cooling load of 25 kW, (a) What is the mass flow rate of refrigerant...
11-11 A refrigerator operates on the ideal vapor-compression refrigeration cycle and uses refrigerant-134a as the working...
11-11 A refrigerator operates on the ideal vapor-compression refrigeration cycle and uses refrigerant-134a as the working fluid. The condenser operates at 1.6 MPa and the evaporator at -6oC. If an adiabatic, reversible expansion device were available and used to expand the liquid leaving the condenser, how much would the COP improve by using this device instead of the throttle device?
In a vapor-compression refrigeration heat pump cycle with Refrigerant 134a as the working fluid provides heating...
In a vapor-compression refrigeration heat pump cycle with Refrigerant 134a as the working fluid provides heating at a rate of 15 kW to maintain a building at 20 °C year-round. During the heating mode in the winter, the outside temperature is 5 °C. It is also used for cooling in the summer when outside temperature is 34 °C. Saturated vapor at 2.4 bar leaves the evaporator and superheated vapor at 8 bar leaves the compressor. There is no significant heat...
In a vapor-compression refrigeration heat pump cycle with Refrigerant 134a as the working fluid provides heating...
In a vapor-compression refrigeration heat pump cycle with Refrigerant 134a as the working fluid provides heating at a rate of 15 kW to maintain a building at 20 °C year-round. During the heating mode in the winter, the outside temperature is 5 °C. It is also used for cooling in the summer when outside temperature is 34 °C. Saturated vapor at 2.4 bar leaves the evaporator and superheated vapor at 8 bar leaves the compressor. There is no significant heat...
In a vapor-compression refrigeration heat pump cycle with Refrigerant 134a as the working fluid provides heating...
In a vapor-compression refrigeration heat pump cycle with Refrigerant 134a as the working fluid provides heating at a rate of 15 kW to maintain a building at 20 °C year-round. During the heating mode in the winter, the outside temperature is 5 °C. It is also used for cooling in the summer when outside temperature is 34°C. Saturated vapor at 2.4 bar leaves the evaporator and superheated vapor at 8 bar leaves the compressor. There is no significant heat transfer...
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...
15% A refrigerator using refrigerant-134a as the working fluid operates on an actual vapor compression ugeration...
15% A refrigerator using refrigerant-134a as the working fluid operates on an actual vapor compression ugeration cycle between 0.12 MPa and 1 MPa. The refrigerant leaves the compressor at 60°C and leaves condenser as a saturated liquid. If the mass flow rate is 1 kg/s, determine the COP of the system. If an adiabatic, reversible expansion device were available and used to expand the liquid leaving the condenser, how much would the COP improve by using this device instead of...
A two-stage compression refrigeration system with an adiabatic liquid-vapor separation unit uses refrigerant-134a as working fluid. The system operates the evaporator at 0.4 MPa, the condenser at 1.6 MPa, and the separator at 0.8 MPa. The compressors use 25 kW of power. Given that the refrigerant is saturated liquid at the inlet of each expansion valve and saturated vapor at the inlet of each compressor, and the compressors are isentropic: (0) show the process on a T-s diagram; ) calculate...
A vapor compression refrigeration system operates at steady
state with refrigerant 134a as the working fluid. Superheated vapor
enters the compressor at 10 lbf/in2 , 0 oF. The liquid leaving the
condenser is at 180 lbf/in2 , 100 oF. There is no significant
pressure drop in the evaporator or condenser. For compressor
efficiency of 83% and refrigeration capacity of 6 tons,
determine
(a) the compressor power input in horsepower, and
(b) the coefficient of performance.
A vapor compression refrigeration system...
Thermodynamics. No interpolation needed.
Problem #3. Refrigerant 134a is the working fluid for vapor-compression refrigeration cycle. The evaporator temperature is 8°C and the condenser pressure is 12 bar. Saturated vapor enters the compressor and superheated vapor enters the condenser at 60°C and exits the condenser as saturated liquid. For a refrigeration capacity of 8 tons or 2.816 x104 J/s determine the following: (1) The refrigerant mass flow rate in kg/s; (2) The compressor isentropic efficiency [Hint: Interpolation is required); (3)...
In a vapor-compression refrigeration heat pump cycle with Refrigerant 134a as the working fluid provides heating at a rate of 15 kW to maintain a building at 20 °C year-round. During the heating mode in the winter, the outside temperature is 5 °C. It is also used for cooling in the summer when outside temperature is 34 °C. Saturated vapor at 2.4 bar leaves the evaporator and superheated vapor at 8 bar leaves the compressor. There is no significant heat...
In a vapor-compression refrigeration heat pump cycle with Refrigerant 134a as the working fluid provides heating at a rate of 15 kW to maintain a building at 20 °C year-round. During the heating mode in the winter, the outside temperature is 5 °C. It is also used for cooling in the summer when outside temperature is 34 °C. Saturated vapor at 2.4 bar leaves the evaporator and superheated vapor at 8 bar leaves the compressor. There is no significant heat...
In a vapor-compression refrigeration heat pump cycle with Refrigerant 134a as the working fluid provides heating at a rate of 15 kW to maintain a building at 20 °C year-round. During the heating mode in the winter, the outside temperature is 5 °C. It is also used for cooling in the summer when outside temperature is 34°C. Saturated vapor at 2.4 bar leaves the evaporator and superheated vapor at 8 bar leaves the compressor. There is no significant heat transfer...
15% A refrigerator using refrigerant-134a as the working fluid operates on an actual vapor compression ugeration cycle between 0.12 MPa and 1 MPa. The refrigerant leaves the compressor at 60°C and leaves condenser as a saturated liquid. If the mass flow rate is 1 kg/s, determine the COP of the system. If an adiabatic, reversible expansion device were available and used to expand the liquid leaving the condenser, how much would the COP improve by using this device instead of...
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