A heat pump with refrigerant-134a as the working fluid is used to keep a space at 25°C by absorbing heat from geothermal water that enters the evaporator at 50°C at a rate of 0.065 kg/s and leaves at 40°C. Refrigerant enters the evaporator at 20°C with a quality of 15 percent and leaves at the same pressure as saturated vapor. If the compressor consumes 1.2 kW of power, determine (a) the mass flow rate of the refrigerant, (b) the rate of heat supply to the space, (c) the COP, and (d) the minimum power input to the compressor for the same rate of heat supply.

A heat pump with refrigerant-134a as the working fluid is used to keep a space at 25°C by absorbing heat from geothermal water that enters the evaporator at 50°C at a rate of 0.065 kg/s and leaves at 40°C. Refrigerant enters the evaporator at 20°C with a quality of 15 percent and leaves at the same pressure as saturated vapor. If the compressor consumes 1.2 kW of power, determine (a) the mass flow rate of the refrigerant, (b) the rate of heat supply to the space, (c) the COP, and (d) the minimum power input to the compressor for the same rate of heat supply.

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

Chapter45: Domestic Refrigerators And Freezers

Section: Chapter Questions

Problem 13RQ: Condensers in these refrigerators are all_______cooled.

See similar textbooks

Similar questions

A cooling system with a capacity of 10 tons of refrigeration operates at 210 KPA in the evaporator while in the condenser it is 850 KPA if the R-134a refrigerant is in a saturated state calculate the theoretical power required to operate the compressor.
A refrigeration system with a capacity of 15 tons of refrigeration, operates at 150 kPa in the evaporator, while in the condenser it is 1100 kPa. If R-134a refrigerant is in a saturated state, calculate the theoretical power required to operate the compressor. Compressor Power. Answer in kW
A vacuum refrigeration system consists of a large insulated flash chamber kept at low pressure by steam ejector which pumps vapor to a condenser. Condensate is removed by condensate to an air vent. Warm return water enters the flash chamber at 13oC, chilled water comes out of the flash chamber at 5oC Vapor leaving the flash chamber has a quality of 0.97 and the temperature in the condenser is 32oC. For 350 kw of refrigeration How much make-up water is needed?
A vacuum refrigeration system consists of a large insulated flash chamber kept at low pressure by steam ejector which pumps vapor to a condenser. Condensate is removed by condensate to an air vent. Warm return water enters the flash chamber at 13oC, chilled water comes out of the flash chamber at 5oC Vapor leaving the flash chamber has a quality of 0.97 and the temperature in the condenser is 32oC. For 350 kw of refrigeration How much vapor must the steam ejector remove from the flash chamber?
A vacuum refrigeration system consists of a large insulated flash chamber kept at low pressure by steam ejector which pumps vapor to a condenser. Condensate is removed by condensate to an air vent. Warm return water enters the flash chamber at 13oC, chilled water comes out of the flash chamber at 5oC Vapor leaving the flash chamber has a quality of 0.97 and the temperature in the condenser is 32oC. For 350 kw of refrigeration A) How much chilled water at 5oC does this system provide? B) How much make-up water is needed? C) How much vapor must the steam ejector remove from the flash chamber?
In a refrigerator the pressure in the evaporator us 2.72 kg/cm sq. and the refrigerant entry is 0.12 dry while at the exit 0.91 dry. During the compression, the work done per kg is 17,033 kg-m/kg. Calculate the COP. The rate of refrigerant circulation is 5.64 kg/min. The given latent heat and specific volume at 2.72 kg/cm sq are 320 kcal/kg ang 0.436 cu m/kg.
2- 750 LPa 55 Condumsur Expusion valve Corpressor Evaparatx Refrigerant-134a enters the condenser of a residential heat pump at 800 kPa and 550C at a rate of 0.018 kg/s and leaves at 750 kPa subcooled by 3°C. The refrigerant enters the compressor at 200 kPa superheated by 4°C. Determine a-the isentropic efficiency of the compressor b-the rate heat supplied to the heated room c-the COP of the heat pump
For a 15 ton capacity refrigeration system, the pressure of refrigerant in the evaporator is 150 kPa, whereas in the condenser it is 1590 kPa. If ammonia (R-717) is used under saturated conditions, calculate the theoretical power required to operate the compressor (kW).
Show also the P-s and T-s diagram. Catalogue data for R-134A compressor with a displacement of 75 L/s show the capacity to be 8 tons when the suction conditions are 0.1 MPa and -20°C and condensing temperature is 50°C. The refrigerant leaves the condenser as saturated liquid. Calculate the actual volumetric efficiency and the brake work of the compressor if the compressor efficiency is 70%
A refrigeration system with a capacity of 15 tons of refrigeration, operates at 150 kPa in the evaporator, while in the condenser it is 1000 kPa. If R-134a refrigerant is in a saturated state, calculate the theoretical power required to operate the compressor. Compressor Power
A refrigeration system is used to cool water in the evaporator at 7.5 kg/s from 30°℃ to 4°C.Find the compressor power needed if COP is 5.
A refrigeration system using R-12 is to have a refrigerating capacity of 70 kW. The evaporating temperature is -10°C and the condensing temperature is 42°C, determine the volume flow rate in L/s of the refrigerant at the inlet of the compressor. (Use h₂ = 440 kJ/kg)