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Problem Statement A vapour compression refrigeration system operates between 12 bar and 1.4 bar. The com-...
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...
A 100-ton refrigeration system operates on the simple vapor compression refrigeration system with R-22 as the...
A 100-ton refrigeration system operates on the simple vapor compression refrigeration system with R-22 as the working fluid. The evaporator pressure is 2 bar and the condenser pressure is 30 bar. The refrigerant leaves the compressor at 160oC. 1 ton of refrigeration = 3.517 kW Determine the cooling load, in kW. Plot all five points (1, 2s, 2a, 3, 4) on the P-h diagram. Determine the power consumed by the refrigeration system, in kW. Determine the COP of the system. Isentropic efficiency...
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)...
Thermodynamics A two-stage vapour-compression refrigeration plant shown in Figure Q2 diagrammatically below is discharged with Refrigerant 12. Both compressors are single-acting, single-stage recipro...
Thermodynamics
A two-stage vapour-compression refrigeration plant shown in Figure Q2 diagrammatically below is discharged with Refrigerant 12. Both compressors are single-acting, single-stage reciprocating machines with four cylinders and as isentropic efficiency of 80%. They each have a stroke/bore ratio of 1.2 and run at 600 rev/min with a volumetric efficiency of 90%. The condenser, flash chamber and evaporator pressures are 10 bar, 3 bar and 1 bar respectively. Saturation states exist at points 5 and 3 and the vapour at...
Thermodynamics A two-stage vapour-compression refrigeration plant shown in Figure Q2 diagrammatically below is discharged with Refrigerant...
Thermodynamics
A two-stage vapour-compression refrigeration plant shown in Figure Q2 diagrammatically below is discharged with Refrigerant 12. Both compressors are single-acting, single-stage reciprocating machines with four cylinders and as isentropic efficiency of 80%. They each have a stroke/bore ratio of 1.2 and run at 600 rev/min with a volumetric efficiency of 90%. The condenser, flash chamber and evaporator pressures are 10 bar, 3 bar and 1 bar respectively. Saturation states exist at points 5 and 3 and the vapour at...
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...
EXAMPLE 6 A household refrigeration system works with a vapor compression refrigeration system with two evaporators...
EXAMPLE 6 A household refrigeration system works with a vapor compression refrigeration system with two evaporators using Refrigerant 134a as the working fluid. This arrangement is used to achieve refrigeration at two different temperatures with a single compressor and a single condenser. The low temperature evaporator operates at -18°C with saturated vapor at its exit and has a refrigerating capacity of 10.5 kW (3 tons). The higher- temperature evaporator produces saturated vapor at 3.2 bar at its exit and has...
A standard vapour compression refrigeration cycle operates between pressures of 220 kPa and 1000 ...
A standard vapour compression refrigeration cycle operates
between pressures of 220 kPa and 1000 kPa, with a compressor having
an isentropic efficiency of 92.0%. It has a mass flow rate of
0.71kg/s. Evaluate the enthalpy for each of the states in the
cycle: Property State 1 2a 3 4 h kJ/kg Calculate the actual power
consumed by the compressor: W˙compressor= kW Calculate the CoP of
the cycle: CoP=
A standard vapour compression refrigeration cycle operates between pressures of 220 kPa...
ycles 1. A refrigeration system operates with a superheated cycle using R134a. The required refrigerating capacity...
ycles 1. A refrigeration system operates with a superheated cycle using R134a. The required refrigerating capacity is 30 TR. The evaporator works at -10 Cand the condenser pressure is 1 MPa. The refrigerant is superheated by 10°C before entering to the compressor. Assume isentropic compression in the compressor and isenthalpic expansion in the expansion valve. Answering the following questions using the ph diagram. and the c Sion in the ring to a) Sketch the process in the p-h diagram and...
determine 1) sub cooling achieved in the heat exchanger, 2) refrigerant flow rate, 3) cop of the plant ii) A refrigeration unit with 100-ton capacity operates in a vapour compression O refrigerati...
determine 1) sub cooling achieved in the heat
exchanger, 2) refrigerant flow rate, 3) cop of the plant
ii) A refrigeration unit with 100-ton capacity operates in a vapour compression O refrigeration cycle between the temperature limits of 308 and 263 K. It uses R-12 G as a refrigerantC A heat exchanger is inducted in the circuit in between the condenser and the expander, The refrigerant vapour leaving the evaporator is superheated in the heat exchanger in the countercurrent flow...
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)...
Thermodynamics
A two-stage vapour-compression refrigeration plant shown in Figure Q2 diagrammatically below is discharged with Refrigerant 12. Both compressors are single-acting, single-stage reciprocating machines with four cylinders and as isentropic efficiency of 80%. They each have a stroke/bore ratio of 1.2 and run at 600 rev/min with a volumetric efficiency of 90%. The condenser, flash chamber and evaporator pressures are 10 bar, 3 bar and 1 bar respectively. Saturation states exist at points 5 and 3 and the vapour at...
Thermodynamics
A two-stage vapour-compression refrigeration plant shown in Figure Q2 diagrammatically below is discharged with Refrigerant 12. Both compressors are single-acting, single-stage reciprocating machines with four cylinders and as isentropic efficiency of 80%. They each have a stroke/bore ratio of 1.2 and run at 600 rev/min with a volumetric efficiency of 90%. The condenser, flash chamber and evaporator pressures are 10 bar, 3 bar and 1 bar respectively. Saturation states exist at points 5 and 3 and the vapour at...
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...
EXAMPLE 6 A household refrigeration system works with a vapor compression refrigeration system with two evaporators using Refrigerant 134a as the working fluid. This arrangement is used to achieve refrigeration at two different temperatures with a single compressor and a single condenser. The low temperature evaporator operates at -18°C with saturated vapor at its exit and has a refrigerating capacity of 10.5 kW (3 tons). The higher- temperature evaporator produces saturated vapor at 3.2 bar at its exit and has...
A standard vapour compression refrigeration cycle operates
between pressures of 220 kPa and 1000 kPa, with a compressor having
an isentropic efficiency of 92.0%. It has a mass flow rate of
0.71kg/s. Evaluate the enthalpy for each of the states in the
cycle: Property State 1 2a 3 4 h kJ/kg Calculate the actual power
consumed by the compressor: W˙compressor= kW Calculate the CoP of
the cycle: CoP=
A standard vapour compression refrigeration cycle operates between pressures of 220 kPa...
ycles 1. A refrigeration system operates with a superheated cycle using R134a. The required refrigerating capacity is 30 TR. The evaporator works at -10 Cand the condenser pressure is 1 MPa. The refrigerant is superheated by 10°C before entering to the compressor. Assume isentropic compression in the compressor and isenthalpic expansion in the expansion valve. Answering the following questions using the ph diagram. and the c Sion in the ring to a) Sketch the process in the p-h diagram and...
determine 1) sub cooling achieved in the heat
exchanger, 2) refrigerant flow rate, 3) cop of the plant
ii) A refrigeration unit with 100-ton capacity operates in a vapour compression O refrigeration cycle between the temperature limits of 308 and 263 K. It uses R-12 G as a refrigerantC A heat exchanger is inducted in the circuit in between the condenser and the expander, The refrigerant vapour leaving the evaporator is superheated in the heat exchanger in the countercurrent flow...
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