Consider a vapour compression refrigeration cycle that uses R-134a as refrigerant. The R-134a enter

Consider a vapour compression refrigeration cycle that uses R-134a as refrigerant. The R-134a enters the compressor as a saturated vapour at 200 kPa, and exits the condenser as a saturated liquid at 900 kPa. The rate of refrigeration of the cycle is to be 6.0 tons of refrigeration (1 ton of refrigeration = 3.517 kW). The compressor isentropic efficiency is 80%. Determine: a) The temperature of evaporation and condensation of the refrigerant; b) Mass flow of the refrigerant R-134a, in kg/min; c) Coefficient of Performance (COP) of the refrigeration cycle. Typical vapour compression refrigeration systems use a throttling valve (or an orifice tube, or a capillary tube) to reduce the liquid refrigerant’s pressure. This is a highly irreversible process. If the cycle efficiency is to be improved by replacing the throttle with a rotary expander with 70% isentropic efficiency, d) What is the new COP? The expander delivers its work developed to the compressor.

Expert Solution

Ally Wells answered 6 months ago

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...

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.

There is a vapor compression type refrigeration cycle using the refrigerant HFC 134 a. In the...

There is a vapor compression type refrigeration cycle using the refrigerant HFC 134 a. In the condenser, it is isostatically cooled, the condensation temperature is 50 ° C., and the condenser outlet is the compressed liquid at 45 ° C. In the evaporator, it is isothermally heated, the evaporation temperature is 10 ° C. and the outlet of the evaporator is heated steam at 15 ° C. When the expansion valve performs isenthalpic expansion, and the adiabatic efficiency of the...

An air conditioner using refrigerant-134a as the working fluid and operating on the ideal vapor-compression refrigeration...

An air conditioner using refrigerant-134a as the working fluid and operating on the ideal vapor-compression refrigeration cycle is to maintain a space at 30°C while operating its condenser at 1000 kPa. Determine the COP of the system when a temperature difference of 2°C is allowed for the transfer of heat in the evaporator. (Take the required values from saturated refrigerant-134a tables.) The COP of the system is ?

A commercial refrigerant that uses R-134a as the refrigerant is used for cooling, to keep the...

A commercial refrigerant that uses R-134a as the refrigerant is used for cooling, to keep the condition at -35o, throws heat into the cooling water that has been in the condenser at 18oC and 0.25kg / s and has been formed since 26o. The refrigerant enters the condenser at 1.2 MPa and 50o ° and exits by cooling 5o C more than the saturation temperature at the same pressure. If the compressor consumes 3.3 kW (Answer: 0.0498 kg / s,...

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 ice-making machine operates on the ideal-vapor compression cycle using refrigerant-134a. The refrigerant enters the compressor...

An ice-making machine operates on the ideal-vapor compression cycle using refrigerant-134a. The refrigerant enters the compressor as saturated vapor at 40 psia and leaves the condenser as saturated liquid at 80 psia. Water enters the ice machine at 55°F and leaves as ice at 25°F. For an ice production rate of 21 lbm/h, determine the power input to the ice machine (169 Btu of heat needs to be removed from each lbm of water at 55°F to turn it into...

An ideal vapor compression refrigeration cycle using r134a as the refrigerant is being used to cool...

An ideal vapor compression refrigeration cycle using r134a as the refrigerant is being used to cool a house. It provides 3 refrigeration tons ≈ 10.5kW of cooling (heat removal from the house air). The refrigerant in the evaporator operates at 400kPa while in the condenser it is at 1000kPa. Treat the surroundings as a thermal reservoir at 33◦C and the air in the house as a thermal reservoir at 19◦C. All reservoirs are at 100kPa. 1. What is the COPr...

For an ideal vapor-compression heat pump cycle, refrigerant 134a is used to provide 35 kW of...

For an ideal vapor-compression heat pump cycle, refrigerant 134a is used to provide 35 kW of heat to a building. Saturated vapor enters the compressor at 1.6 bar and saturated liquid exits the condenser which operates at 8 bar. What is (a) the mass flow rate of the refrigerant, and (b) the COP?

A single stage simple vapr compression refrigeration cycle using R12 refrigerant is operating at a condenser...

A single stage simple vapr compression refrigeration cycle using R12 refrigerant is operating at a condenser temperature of 40 degrees C and an evaporator temperature of -5 degrees C. If the compressor is a reciprocating type compressor with 4 cylinder, rotating at 1800 RPM, has a cylinder diameter of 5cm, stroke length to diameter ratio of 1.4, and clearance ratio of 5%. Assume a polytropic index to be 1.13. 1- Sketch the cycle flow diagram, and identify the states on...

Question