1. A refrigerator uses refrigerant-134a as the working fluid and operates between -5 oC and 40...
1. A refrigerator uses refrigerant-134a as the working fluid and operates between -5 oC and 40 oC. The compressor, which is a reciprocating type, rotates at 1500 rpm. The compressor has 4 cylinders. The cylinder diameter is 120 mm and the stroke is 100 mm. The clearance volume is 5%. Find:
- Clearance volumetric efficiency,
- the mass flow rate of the refrigerant
- the power input to the compressor,
- the refrigeration capacity
- the COP of the system
- For above compressor type, sketch volumetric efficiency, mass flow rate, power and refrigeration capacity as function of evaporator temperature.
- Explain some methods to control the capacity of reciprocating and screw type compressors.
Homework Answers
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1. A refrigerator uses
refrigerant-134a as the working fluid and operates between -5
oC and 40...
a refrigerator uses refrigerant 134a as a working fluid and operates on the vapour -compression refrigiration...
a refrigerator uses refrigerant 134a as a working fluid and operates on the vapour -compression refrigiration cycle.the evaporator is maintained at -100C and the refrigirant is a dry saturated vapour as it leaves the evaporator. the compressor has an efficiency of 80%.the conditions at the outlet of the condensor are 300C and 9 bar. 1-if the mass flow rate of the refrigerant is 0,08kg/s workout the rate of heat removal from the refrigerant space.the power input to the cpmpressor and...
Renewable Energy 2. A refrigerator uses refrigerant 134a as the working fluid and operates on an...
Renewable Energy
2. A refrigerator uses refrigerant 134a as the working fluid and operates on an ideal vapor compression refrigeration cycle between 0.14 and 0.8 MPa. The mass flow rate of the refrigeration is 50 g/s. Determine: a. The rate of heat removal from the space ( cooling capacity) b. The power input required c. The COP of the refrigerator
1) A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated...
1) A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -30°C by rejecting its waste heat to cooling water that enters the condenser at 16 °C at a rate of 0.25 kg/s and leaves at 26°C. The refrigerant enters the condenser at 1.2 MPa and 65°C and leaves at 42°C. The inlet state of the compressor is 60 kPa and -34°C and the compressor is estimated to gain a net heat of...
(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...
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...
Refrigeration Question 1 a) A refrigerant R134a refrigerator is to maintain the refrigerated spac...
Refrigeration Question 1 a) A refrigerant R134a refrigerator is to maintain the refrigerated space at -100C. Would you recommended an evaporator pressure of 1.6 bar or 2 bar for this system? Why? -la An automotive Air conditioner using refrigerant R134a as the working fluid and operating on ideal vapor compression refrigerant cycle is to maintain a space at 24°C while operating its condenser at 1000 kPa. Determine the COP of the system when a temperature difference of 14°C is allowed...
A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space...
A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at −25°C by rejecting waste heat to cooling water that enters the condenser at 20°C at a rate of 0.25 kg/s and leaves at 26°C. The refrigerant enters the condenser at 1.2 MPa and 50°C and leaves at the same pressure subcooled by 5°C. If the compressor consumes 3.3 kW of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration...
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 commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at by The refrigerant enters the condenser at compressor consumes 3.3 kW of power, dete...
A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at by The refrigerant enters the condenser at compressor consumes 3.3 kW of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (e) the COP, and (d) the g waste heat to cooling water that enters the condenser at 18°C at a rate of 0.25 kg/s and leaves at 26°C. 1.2 MPa and 50°C and leaves at the same...
refrigerator, as shown in FIGURE P 3 with the corresponding T-s diagram, uses refrigerant R-134a as...
refrigerator, as shown in FIGURE P 3 with the corresponding T-s diagram, uses refrigerant R-134a as the working fluid and operates on the ideal vapour-compression refrigeration cycle except for the compression process. The refrigerant enters the evaporator at 120 kPa with a quality of 34.026 percent and leaves the compressor at 70 0C. If the compressor consumes 0.45 kW of power, Determine: (a) The mass flow rate of the refrigerant, in kg/s, correct to 6 dp. (b) The condenser pressure,...
Renewable Energy
2. A refrigerator uses refrigerant 134a as the working fluid and operates on an ideal vapor compression refrigeration cycle between 0.14 and 0.8 MPa. The mass flow rate of the refrigeration is 50 g/s. Determine: a. The rate of heat removal from the space ( cooling capacity) b. The power input required c. The COP of the refrigerator
1) A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -30°C by rejecting its waste heat to cooling water that enters the condenser at 16 °C at a rate of 0.25 kg/s and leaves at 26°C. The refrigerant enters the condenser at 1.2 MPa and 65°C and leaves at 42°C. The inlet state of the compressor is 60 kPa and -34°C and the compressor is estimated to gain a net heat of...
(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...
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...
Refrigeration Question 1 a) A refrigerant R134a refrigerator is to maintain the refrigerated space at -100C. Would you recommended an evaporator pressure of 1.6 bar or 2 bar for this system? Why? -la An automotive Air conditioner using refrigerant R134a as the working fluid and operating on ideal vapor compression refrigerant cycle is to maintain a space at 24°C while operating its condenser at 1000 kPa. Determine the COP of the system when a temperature difference of 14°C is allowed...
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 commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at by The refrigerant enters the condenser at compressor consumes 3.3 kW of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (e) the COP, and (d) the g waste heat to cooling water that enters the condenser at 18°C at a rate of 0.25 kg/s and leaves at 26°C. 1.2 MPa and 50°C and leaves at the same...
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