Solve Energy Transfer in Refrigeration System

In summary, the problem involves a refrigeration system where Refrigerant-134a enters the compressor as saturated vapor at 0.14 MPa and exits as superheated vapor at 0.8 MPa and 50C. The rate of mass flow is given as 0.04 kg/s. The task is to determine the rate of energy transfers by mass into and out of the compressor, assuming neglect of kinetic and potential energies. The approach to solving this problem would be to apply conservation of mass and conservation of energy principles.
  • #1
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The problem statement
Refrigerant- 134a enters the compressor of a refrigeration system as saturated vapor at 0.14 MPa, and leaves as superheated vapor at 0.8 MPa and 50C at a rate of 0.04 kg/s. Determine the rate of energy transfers by mass into and out of the compressor. Assume the kinetic and potential energies to be neglected.


I know that the rate of mass in is equal to the rate of mass out and I'm assuming that I only need to find the internal energ u. But I'm not really sure at all to be honest. I have my textbook with all the formulas but I don't know what to apply when or how. Could someone please help me. :confused:
 
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  • #2
i think u should take a shot urself first, and show it. i don't know exactly if I'm allowed to help u just like that.
 
  • #3
Apply conservation of mass and conservation of energy.
 

1. How does energy transfer occur in a refrigeration system?

Energy transfer in a refrigeration system occurs through the process of evaporation and condensation of a refrigerant. The compressor compresses the refrigerant, which raises its temperature and pressure. As the refrigerant flows through the condenser, it releases heat to the surrounding air and condenses into a liquid. The liquid refrigerant then flows into the evaporator, where it evaporates and absorbs heat from the surrounding air, cooling it. This cycle of evaporation and condensation allows for the transfer of energy to maintain a cool temperature in the system.

2. What factors affect energy transfer in a refrigeration system?

The efficiency of energy transfer in a refrigeration system is affected by several factors, including the type of refrigerant used, the design and size of the system, and the temperature difference between the evaporator and condenser. Additionally, the condition of the system components, such as the compressor and condenser coils, can also impact energy transfer.

3. How does the choice of refrigerant impact energy transfer in a refrigeration system?

The choice of refrigerant can greatly impact the efficiency of energy transfer in a refrigeration system. Some refrigerants, such as hydrofluorocarbons (HFCs), have a high global warming potential (GWP) and contribute to climate change. Other refrigerants, such as hydrocarbons (HCs) and carbon dioxide (CO2), have a lower GWP and are more environmentally friendly. The properties of the refrigerant also play a role, as some may have better heat transfer capabilities than others.

4. Can the energy transfer in a refrigeration system be improved?

Yes, the energy transfer in a refrigeration system can be improved through regular maintenance, such as cleaning and replacing system components, and by using more efficient components, such as compressors and condensers. Additionally, choosing a refrigerant with a lower GWP can also improve energy transfer.

5. How does energy transfer in a refrigeration system impact its overall efficiency?

The efficiency of energy transfer in a refrigeration system directly impacts its overall efficiency. The more efficient the energy transfer, the less energy is required to maintain a cool temperature, resulting in lower energy consumption and costs. Therefore, it is important to regularly maintain and optimize the energy transfer in a refrigeration system to improve its overall efficiency.

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