![A refrigerator releases 10 k]/s.heat to an environment of 25°C and the compressor power input is 3 KW. If the cooled place is maintained at -10°C, what is the second law efficiency of this system?](http://img.homeworklib.com/questions/e6ed6810-3a75-11eb-b2f8-41321f46c883.png?x-oss-process=image/resize,w_560)
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A refrigerator releases 10 k]/s.heat to an environment of 25°C and the compressor power input is...
Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 MPa and -10°C at a rate of 0.124...
Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 MPa and -10°C at a rate of 0.124 kg/s, and it leaves at 0.7 MPa and 50°C. The refrigerant is cooled in the condenser to 24°C and 0.65 MPa, and it is throttled to 0.15 MPa. Disregarding any heat transfer and pressure drops in the connecting lines between the components, determine (a) the rate of heat removal from the refrigerated space and the power input to the compressor...
The power input to the compressor of an ammonia vapor compression plant is 8.2 kW. The...
The power input to the compressor of an ammonia vapor compression plant is 8.2 kW. The mechanical efficiency is 85%. The ammonia is dry saturated vapor at -5oC at inlet to the compressor. After compression, the vapor is at 1000 kPa. The compressor has an isentropic efficiency of 90%. The condenser produces saturated liquid. Calculate the coefficient of performance for the refrigerator and for the heat pump for this plant.
1. A food compartment is kept at -12°C by a refrigerator in an environment at 30°...
1. A food compartment is kept at -12°C by a refrigerator in an environment at 30° C. The total heat transfer to the food compartment is estimated to be 3300 kJ/hr and the heat rejection in the condenser is 4800 kJ/hr. Determine the power input to the compressor, in kW, and the COP of the refrigerator. 30°C 800 kJ/h in 3300 kJ/h -12°C
1. Refrigerant 134a enters the compressor of a refrigerator as superheated vapor at 0.20 MPa and...
1. Refrigerant 134a enters the compressor of a refrigerator as superheated vapor at 0.20 MPa and -10 °C at a rate of 0.07 kg/s, and it leaves at 1.2 MPa and 70 °C. The refrigerant is cooled in the condenser to 44 °C and 1.130 MPa and it is throttled to 0.20 MPa. Disregarding heat transfer and pressure drop in the connecting lines between the components, show the cycle on a T-s diagram with respect to the saturation line. Determine...
3) A vapor-compression refrigerator uses refrigerant-134a. Superheated vapor enters the compressor at 100 kPa and -20°...
3) A vapor-compression refrigerator uses refrigerant-134a. Superheated vapor enters the compressor at 100 kPa and -20° C, and exits at 1 MPa and 60° C. The refrigerant is cooled to 35° C in the condenser and then expands back to 100 kPa through an expansion valve. Neglect pressure losses within the condenser and evaporator. The refrigerant flow rate is 0.10 kg/s. Calculate the following a) the rate of heat removal from the cooled space, in kw, b) the rate of...
compare the compressor power requirements of a R22 refridgeration of 0°c with a constant capacity of...
compare the compressor power requirements of a R22
refridgeration of 0°c with a constant capacity of 100kw which is
.
2.1 water-cooled with saturated condensing temperature of
35°C.
2.2 air cooled with sarurated condensing temperature of 45°C.
Question 2 Compare the compressor power requirements of a R22-refrigeration plant operating at a constant saturated suction temperature of 0°C with a constant capacity of 100 kW, which is 2.1 Water-cooled with a saturated condensing temperature of 35°C 2.2 Air-cooled with a saturated...
In an aircraft cooling system, air enters the compressor at 1 bar and 4°C and is...
In an aircraft cooling system, air enters the compressor at 1 bar and 4°C and is compressed to 3 bar with an isentropic efficiency of 72%. The compressed air is cooled in a heat exchanger at constant pressure to 55°C and expands in an expander to 1 bar with an isentropic efficiency of 78%. The low temperature air absorbs heat load of 3 tonnes of refrigeration at constant pressure before re- entering the compressor. The compressor is driven by the...
ourses 1 SPRING 2018 ME 3261-01 / Week 12. Second Law for Open System , Quiz#3...
ourses 1 SPRING 2018 ME 3261-01 / Week 12. Second Law for Open System , Quiz#3 A Carnot refrigerator requires 10 kW of power input to remove 20 kW of neat trom a space to be maintained at 20°C The temperature of the surrounding is: Select one O a. 440 K O b. 400 K c. 360 K O d 320 K ous page Next page
An air refrigeration plant of 70.26 kW, capacity comprises a centrifugal compressor, a cooler hea...
An air refrigeration plant of 70.26 kW, capacity comprises a centrifugal compressor, a cooler heat exchanger and an air turbine. The compressor is coupled directly to the air turbine. The compressor also receives power from another prime mover. The processes in the compressor and the turbine are adiabatic but not isentropic. Air at temperature 294 K and 85 kPa enters the compressor. It leaves the compressor at 363 K. the same air enters the turbine at 311 K and 150...
Warm region H The compressor of the vapor-compression refrigerator takes in 0.2 kg/s of R134a as...
Warm region H The compressor of the vapor-compression refrigerator takes in 0.2 kg/s of R134a as a saturated vapor at 100 kPa. It has a compression ratio of 10 and an isentropic efficiency of 85%. The fluid exits the condenser with a temperature of 35°C. a. Calculate the COP b. Find the power used by the compressor (kw) c. Determine the entropy change across the valve (kJ/kgK). d. Draw the T-s diagram. 1. Condenser Expasion Compressor device Evaporator Cold region...
Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 MPa and -10°C at a rate of 0.124 kg/s, and it leaves at 0.7 MPa and 50°C. The refrigerant is cooled in the condenser to 24°C and 0.65 MPa, and it is throttled to 0.15 MPa. Disregarding any heat transfer and pressure drops in the connecting lines between the components, determine (a) the rate of heat removal from the refrigerated space and the power input to the compressor...
1. A food compartment is kept at -12°C by a refrigerator in an environment at 30° C. The total heat transfer to the food compartment is estimated to be 3300 kJ/hr and the heat rejection in the condenser is 4800 kJ/hr. Determine the power input to the compressor, in kW, and the COP of the refrigerator. 30°C 800 kJ/h in 3300 kJ/h -12°C
1. Refrigerant 134a enters the compressor of a refrigerator as superheated vapor at 0.20 MPa and -10 °C at a rate of 0.07 kg/s, and it leaves at 1.2 MPa and 70 °C. The refrigerant is cooled in the condenser to 44 °C and 1.130 MPa and it is throttled to 0.20 MPa. Disregarding heat transfer and pressure drop in the connecting lines between the components, show the cycle on a T-s diagram with respect to the saturation line. Determine...
3) A vapor-compression refrigerator uses refrigerant-134a. Superheated vapor enters the compressor at 100 kPa and -20° C, and exits at 1 MPa and 60° C. The refrigerant is cooled to 35° C in the condenser and then expands back to 100 kPa through an expansion valve. Neglect pressure losses within the condenser and evaporator. The refrigerant flow rate is 0.10 kg/s. Calculate the following a) the rate of heat removal from the cooled space, in kw, b) the rate of...
compare the compressor power requirements of a R22
refridgeration of 0°c with a constant capacity of 100kw which is
.
2.1 water-cooled with saturated condensing temperature of
35°C.
2.2 air cooled with sarurated condensing temperature of 45°C.
Question 2 Compare the compressor power requirements of a R22-refrigeration plant operating at a constant saturated suction temperature of 0°C with a constant capacity of 100 kW, which is 2.1 Water-cooled with a saturated condensing temperature of 35°C 2.2 Air-cooled with a saturated...
In an aircraft cooling system, air enters the compressor at 1 bar and 4°C and is compressed to 3 bar with an isentropic efficiency of 72%. The compressed air is cooled in a heat exchanger at constant pressure to 55°C and expands in an expander to 1 bar with an isentropic efficiency of 78%. The low temperature air absorbs heat load of 3 tonnes of refrigeration at constant pressure before re- entering the compressor. The compressor is driven by the...
ourses 1 SPRING 2018 ME 3261-01 / Week 12. Second Law for Open System , Quiz#3 A Carnot refrigerator requires 10 kW of power input to remove 20 kW of neat trom a space to be maintained at 20°C The temperature of the surrounding is: Select one O a. 440 K O b. 400 K c. 360 K O d 320 K ous page Next page
Warm region H The compressor of the vapor-compression refrigerator takes in 0.2 kg/s of R134a as a saturated vapor at 100 kPa. It has a compression ratio of 10 and an isentropic efficiency of 85%. The fluid exits the condenser with a temperature of 35°C. a. Calculate the COP b. Find the power used by the compressor (kw) c. Determine the entropy change across the valve (kJ/kgK). d. Draw the T-s diagram. 1. Condenser Expasion Compressor device Evaporator Cold region...
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