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?
Homework Answers
in this question we have to find the improvement in COP when isentropic expander is used
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11-11 A refrigerator operates on the ideal vapor-compression
refrigeration cycle and uses refrigerant-134a as the working...
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 refrigerator operates on an ideal vapor compression refrigeration cycle with R-134a as the working fluid....
A refrigerator operates on an ideal vapor compression refrigeration cycle with R-134a as the working fluid. The evaporator pressure is 0.12 MPa and the condenser pressure is 0.8 MPa. If the rate of heat removal from the refrigerated space is 32 kJ/s, the mass flow rate of refrigerant is
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...
(12 points) A refrigerator using refrigerant-134a as the working fluid operates on the vapor compression cycle....
(12 points) A refrigerator using refrigerant-134a as the working fluid operates on the vapor compression cycle. The cycle operates between 200 kPa and 1.2 MPa. The refrigerant flows through the cycle at a rate of 0.019 kg/s. The (actual) refrigerator has a compressor with an isentropic efficiency of 85%. The refrigerant enters the compressor slightly superheated by 56 C hint add this to the saturation temperature). The refrigerant leaves the condenser slightly subcooled by 1.9°C. What is the rate of...
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...
11-14 A refrigerator uses refrigerant-134a as the working fluid and operates on an ideal vapor-compression refrigeration...
11-14 A refrigerator uses refrigerant-134a as the working fluid and operates on an ideal vapor-compression refrigeration cycle between 0.12 and 0.7 MPa. The mass flow rate of the refrigerant is 0.05 kg/s. Show the cycle on a T-s diagram with respect to saturation lines. Determine (a) the rate of heat removal from the refrigerated space and the power input to the compressor, (b) the rate of heat rejection to the environment, and (c) the coefficient of performance. Answers: (a) 7.41...
Tt (12 points) A refrigerator using refrigerant-134a as the working fluid operates on the vapor compression...
Tt
(12 points) A refrigerator using refrigerant-134a as the working fluid operates on the vapor compression cycle. The cycle operates between 200 kPa and 1.2 MPa. The refrigerant flows through the cycle at a rate of 0.015 kg/s. The actual) refrigerator has a compressor with an isentropic efficiency of 82%. The refrigerant enters the compressor slightly superheated by 6.2°C (hint: add this to the saturation temperature). The refrigerant leaves the condenser slightly subcooled by 1.8°C. What is the rate of...
An ideal vapor-compression refrigeration cycle that uses refrigerant R-134a as its working fluid maintains a condenser...
An ideal vapor-compression refrigeration cycle that uses refrigerant R-134a as its working fluid maintains a condenser at 800 kPa and the evaporator at -12C. (a) Determine this system's COP and the amount of power required to service a 150kW cooling load. (b) Determine the P,T, h, S and exergy of R-134a at all four states of the entire cycle. Assume the ambient temperature to be 25C.
4. (25 pts) An ideal vapor-compression refrigeration cycle that uses refrigerant 134a as its working uid...
4. (25 pts) An ideal vapor-compression refrigeration cycle that uses refrigerant 134a as its working uid maintains a condenser at 800 kPa and the evaporator at -12 C. Determine this system's cOP and the amount of power required to service a 150W cooling load.
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...
(12 points) A refrigerator using refrigerant-134a as the working fluid operates on the vapor compression cycle. The cycle operates between 200 kPa and 1.2 MPa. The refrigerant flows through the cycle at a rate of 0.019 kg/s. The (actual) refrigerator has a compressor with an isentropic efficiency of 85%. The refrigerant enters the compressor slightly superheated by 56 C hint add this to the saturation temperature). The refrigerant leaves the condenser slightly subcooled by 1.9°C. What is the rate of...
11-14 A refrigerator uses refrigerant-134a as the working fluid and operates on an ideal vapor-compression refrigeration cycle between 0.12 and 0.7 MPa. The mass flow rate of the refrigerant is 0.05 kg/s. Show the cycle on a T-s diagram with respect to saturation lines. Determine (a) the rate of heat removal from the refrigerated space and the power input to the compressor, (b) the rate of heat rejection to the environment, and (c) the coefficient of performance. Answers: (a) 7.41...
Tt
(12 points) A refrigerator using refrigerant-134a as the working fluid operates on the vapor compression cycle. The cycle operates between 200 kPa and 1.2 MPa. The refrigerant flows through the cycle at a rate of 0.015 kg/s. The actual) refrigerator has a compressor with an isentropic efficiency of 82%. The refrigerant enters the compressor slightly superheated by 6.2°C (hint: add this to the saturation temperature). The refrigerant leaves the condenser slightly subcooled by 1.8°C. What is the rate of...
An ideal vapor-compression refrigeration cycle that uses refrigerant R-134a as its working fluid maintains a condenser at 800 kPa and the evaporator at -12C. (a) Determine this system's COP and the amount of power required to service a 150kW cooling load. (b) Determine the P,T, h, S and exergy of R-134a at all four states of the entire cycle. Assume the ambient temperature to be 25C.
4. (25 pts) An ideal vapor-compression refrigeration cycle that uses refrigerant 134a as its working uid maintains a condenser at 800 kPa and the evaporator at -12 C. Determine this system's cOP and the amount of power required to service a 150W cooling load.
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