Saturated vapor R-134a enters the adiabatic compressor of a refrigeration system steadily at 25 psia. The...

Saturated vapor R-134a enters the adiabatic compressor of a refrigeration system steadily at 25 psia. The refrigerant exits the compressor at 200 psia and 220 °F. a) Determine the work (Btu/lbm) required by the compressor for this process. b) Determine the flow work (Btu/lbm) for the refrigerant at the compressor exit. c) Determine the entropy change per unit mass for the refrigerant during the compression process. d) Determine the isentropic efficiency of the compressor. Include an appropriate sketch

Expert Solution

samet mamat answered 11 hours ago

Refrigerant-134a enters an adiabatic compressor as saturated vapor at 160 kPa at a rate of 2.8...

Refrigerant-134a enters an adiabatic compressor as saturated vapor at 160 kPa at a rate of 2.8 m3/min and is compressed to a pressure of 900 kPa. Determine the minimum power that must be supplied to the compressor. Use the tables for R-134a. The minimum power that must be supplied to the compressor

Refrigerant 134a enters an insulated compressor operating at steady state as saturated vapor at -26oC with...

Refrigerant 134a enters an insulated compressor operating at steady state as saturated vapor at -26oC with a volumetric flow rate of 0.18 m3/s. Refrigerant exits at 8 bar, 70oC. Changes in kinetic and potential energy from inlet to exit can be ignored. Determine the volumetric flow rate at the exit, in m3/s, and the compressor power, in kW.

Refrigerant 134a enters an insulated compressor operating at steady state as saturated vapor at -20oC with...

Refrigerant 134a enters an insulated compressor operating at steady state as saturated vapor at -20oC with a volumetric flow rate of 0.18 m3/s. Refrigerant exits at 9 bar, 70oC. Changes in kinetic and potential energy from inlet to exit can be ignored. Determine the volumetric flow rate at the exit, in m3/s, and the compressor power, in kW.

Refrigerant R-134a enters the compressor of a refrigeration machine at 140 kPa pressure and -10 °...

Refrigerant R-134a enters the compressor of a refrigeration machine at 140 kPa pressure and -10 ° C temperature and exits at 1 MPa pressure. The volumetric flow of the refrigerant entering the compressor is 0.23 m3 / minute. The refrigerant enters the throttling valve at 0.95 MPa pressure and 30 ° C, exiting the evaporator as saturated steam at -18 ° C. The adiabatic efficiency of the compressor is 78%. Show the cycle in the T-s diagram. In addition, a)...

An ideal refrigeration cycle utilizes R-134a as a working fluid. If the fluid enters the compressor...

An ideal refrigeration cycle utilizes R-134a as a working fluid. If the fluid enters the compressor as saturated vapor at 6 C and enters a throttling valve as a saturated liquid at 1.2MPa. Assuming the mass flow rate of fluid is 1 kg/sec. 1. The heat received by the fluid (kJ) is 2. The heat received by the surroundings (kJ) is 3. The power input to the compressor (kJ) is 4. The coefficient of performance is

A refrigeration system contains an adiabatic compressor with Refrigerant-134a as working fluid. Inlet conditions (state 1)...

A refrigeration system contains an adiabatic compressor with Refrigerant-134a as working fluid. Inlet conditions (state 1) are 140 kPa and -100C and the exit state is 1.6 MPa and 800C (state 2). The changes in KE and PE are negligible. Determine (a) actual exit specific enthalpy in kJ/kg, (b) exit specific isentropic entropy in kJ/lg.K and (c) efficiency of the compressor in %.

Argon gas enters an adiabatic compressor at 16.0 psia with 99 F with a velocity of...

Argon gas enters an adiabatic compressor at 16.0 psia with 99 F with a velocity of 49.9 ft/s. It exits at 225 psia and 209.5 ft/s. If the isentropic efficiency of the compressor is 83.1%, determine: a) the exit temperature (R) of the argon b) the work input to the compressor (Btu/lbm)

The capacity of a propane vapor-compression refrigeration system is 8 tons. Saturated vapor at 0°F enters...

The capacity of a propane vapor-compression refrigeration system is 8 tons. Saturated vapor at 0°F enters the compressor, and superheated vapor leaves at 120°F, 180 lbf/in.2 Heat transfer from the compressor to its surroundings occurs at a rate of 3.5 Btu per lb of refrigerant passing through the compressor. Liquid refrigerant enters the expansion valve at 85°F, 180 lbf/in.2 The condenser is water-cooled, with water entering at 65°F and leaving at 80°F with a negligible change in pressure. Determine (a)...

A sweet, water-saturated natural gas enters a compressor at 50 psia and 100F and leaves at...

A sweet, water-saturated natural gas enters a compressor at 50 psia and 100F and leaves at 200 psia and 300F. a. Is there any chance of water condensing in the compressor? If so, how much? Answer in lb H2O/MMscf gas compressed. b. Estimate the mole fraction of water vapor in the gas stream leaving the compressor. c. The natural gas is then cooled to 190 psia and 100F before entering the second stge of compression. Should a vapor-liquid scrubber be...

A vapor-compression refrigeration cycle operates at steady state with Refrigerant 134a as the working fluid. Saturated...

A vapor-compression refrigeration cycle operates at steady state with Refrigerant 134a as the working fluid. Saturated vapor enters the compressor at 2 bar, and saturated liquid exits the condenser at 10 bar. The isentropic compressor efficiency is 80%. The mass flow rate of refrigerant is 7 kg/min. Determine: (a) the compressor power, in kW. (b) the refrigeration capacity, in tons. (c) the coefficient of performance.

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