Consider a household refrigerator that uses HFC-134a as the refrigerant, operating between the pressures of 1.0 bar and 10 bars. Determine the enthalpy at each ofthe points 1, 2, 3, and 4, and calculate the coefficient of performance. Compare to the COP of a Carnot refrigerator operating between the same extreme temperatures. Does this temperature range seem reasonable for a household refrigerator? Explain briefly.

Consider a household refrigerator that uses HFC-134a as the refrigerant, operating between the pressures of 1.0 bar and 10 bars. Determine the enthalpy at each ofthe points 1, 2, 3, and 4, and calculate the coefficient of performance. Compare to the COP of a Carnot refrigerator operating between the same extreme temperatures. Does this temperature range seem reasonable for a household refrigerator? Explain briefly.

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 12RQ: Refrigerators currently being manufactured in the United States are using______as their refrigerant.

See similar textbooks

Similar questions

Does a refrigerator that has a higher COP necessarily have a higher second-law efficiency than one with a lower COP? Explain.
Why is it important to clean the condenser coils of a household refrigerator a few times a year? Also, why is it important not to block airflow through the condenser coils?
How did Clausius modify Carnot’s original analysis of the ideal heat engine?
Prove that the COP of all completely reversible refrigerators must be the same when the reservoir temperatures are the same.
Refrigerant 134-a enters the coil of the condenser of a residential heat pump at 500kPa and 400C and leaves at the same pressure as a saturated liquid at a rate of 0.05kg/s. Determine the power of a compressor required to run the heat pump if heat absorption from the outside air is 200kJ/kg. Please give clear solution and step by step
There is a refrigerator that uses HFC-134a as a refrigerant and operates between 1.4 atm and 12 atm. Calculate the coefficient of performance of this refrigerator and the proportion of vapor at the lowest temperature through the throttle, respectively.
Describe a refrigerator that violates the Clausius statement of the second law
A completely reversible refrigerator is driven by a 10-kW compressor and operates with thermal energy reservoirs at 250 K and 300 K. Calculate the rate of cooling provided by this refrigerator
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.
A refrigeration system is to cool bread loaves with an average mass of 350 g from 30 to –10°C at a rate of 1200 loaves per hour with refrigerated air at –30°C. Taking the average specific and latent heats of bread to be 2.93 kJ/kg·°C and 109.3 kJ/kg, respectively, determine the rate of heat removal from the breads, in kJ/h.
Does a Liquid-Dominant Geothermal Power Plant need both a condenser and a cooling tower? Or will either one do? And why.
Explain using the concept of Ideal gas laws on how do you make a cold body, and how air conditioners and refrigerators work.