refrigerator refrigerated space at -35°C by rejecting waste heat to cooling water that enters the condenser at T. 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 T, C. If the compressor consumes 3.3 kW of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, Q, (c) the COP. Is this cycle reversible or irreversible? Explain. etrigerant-134 working to keep Notes: If the last digit of your student number is less than 5, t T, is equal to the last digit of your student number. Shee questions, y T, 16°C. It is 20°C otherwise.

refrigerator refrigerated space at -35°C by rejecting waste heat to cooling water that enters the condenser at T. 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 T, C. If the compressor consumes 3.3 kW of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, Q, (c) the COP. Is this cycle reversible or irreversible? Explain. etrigerant-134 working to keep Notes: If the last digit of your student number is less than 5, t T, is equal to the last digit of your student number. Shee questions, y T, 16°C. It is 20°C otherwise.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter44: Geothermal Heat Pumps

Section: Chapter Questions

Problem 1RQ: Geothermal heat pumps, or water-source heat pumps, are classified as either _____loop or _____loop...

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Similar questions

Condensers in these refrigerators are all_______cooled.
Geothermal heat pumps, or water-source heat pumps, are classified as either _____loop or _____loop systems.
Heat is rejected from the condenser of a heat pump cycle by refrigerant-134a entering at 700 kPa and 50 ◦C at a rate of 105 kg/h and leaves as a saturated liquid. Determine (a) the temperature of R-134a at the condenser exit, (b) the volume flow rate at the exit of the condenser in L/min, (c) the COP of the heat pump if the rate of heat absorbed in the evaporator is 12,000 Btu/h.
P28. R134-a enters the condenser of a residential heat pump at 800 kPa and 40°C at a rate of 0.018 kg/s, and leavesat 800 kPa with quality equal to zero. If the compressor consumes 1.2 kW of power, determine the COP of the pump.heat and the rate of heat absorption from the outside air.
Refrigerant-134a enters the compressor of a refrigerator as superheated vapour at 0.20 MPaand 25°C at a rate of 0.07 kg/s, and it leaves at 1.2 MPa and 100°C. The refrigerant is cooledin the condenser to 44°C and 1.2 MPa, and it is throttled to 0.20 MPa. Disregarding any heattransfer and pressure drops in the connecting lines between the components,2.1 Calculate the rate of heat removal from the refrigerated space and the power input tothe compressor,2.2 Calculate the isentropic efficiency of the compressor, and2.3 Calculate the Coefficient of Performance of the refrigerator
Refrigerant R-134a to the compressor of a refrigeration machine It enters at 140 kPa pressure and -10 °C, and exits at 1 MPa pressure. Volumetric flow of the refrigerant entering the compressor It is 0.23 m³/minute. The refrigerant enters the throttling valve at a pressure of 0.95 MPa and at 30 °C, and exits the evaporator as saturated steam at -18 °C. Adiabatic efficiency of the compressor It is 78%. Show the cycle in the T-s diagram. And; a) Calculate the power required to run the compressor. b) Calculate the heat absorbed per unit time from the cooled medium. ( COPSM=? ) c) Calculate, between the evaporator and the compressor, how much the pressure of the refrigerant drops and how much the heat gain.
A refrigerator using R-134a as the refrigerant is used to keep a space at - 10°C by rejecting heat to ambient air at 22 °C. R-134a enters the compressor at 140 kPa as a saturated vapor and leaves at 800 kPa and 70 °C. The refrigerant leaves the condenser as a saturated liquid. The rate of cooling provided by the system is 2600 W. Determine (a) the mass flow rate of R-134a, (b) the COP, (c) the exergy destruction in each component of the cycle, (d) the second-law efficiency of the cycle, and (e) the total exergy destruction in the cycle.
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. a) Calculate the power required to start the compressor. b) Calculate the heat taken in a unit time from the cooled environment. COP=? c) Calculate between the evaporator and the compressor, how much the pressure of the refrigerant drops, and how much is the heat gain.
The refrigerant R-134a enters the compressor of a refrigeration machine at a pressure of 140kPa and a temperature of -10°C, and exits at a pressure of 1MPa. The volumetric flow rate of the refrigerant entering the compressor is 0.23m3/minute. The refrigerant enters the throttling valve at 0.95MPa pressure and 30 °C, and exits the evaporator as saturated steam at -18 °C. The adiabatic efficiency of the compressor is 78%. Show the cycle in the T-s diagram. a) The power required to operate the compressor, b) Calculate the heat withdrawn from the cooled environment in unit time, COPsm=? c) Calculate how much the pressure of the refrigerant drops between the evaporator and the compressor and how much the heat gain is
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A steam turbine with rated capacity of 42,000 kW (actual work produced) operates with steam at inlet of 4200 kPa and 420°C, and discharges into a condenser at a pressure of 60 kPa. Assuming turbine efficiency of 0.85, determine the state of the steam at discharge and the mass flow rate of the steam.
Refrigerant 134 A enters in a condenser of a heat pump at 180 kPa and -4 0C and exits with a quality of 0.8 and the same pressure of 180 kPa. The mass flow rate of the refrigerant is 65 kg/h, and the heat pump compressor consumes 45 kJ/min of power. Determine the coefficient of performance of the heat pump. Type your answer in the first box.