Thermodynamics studies the relationship between temperature, energy, and work, and describes how energy changes from one form to another. A refrigeration cycle is a practical example of the application of thermodynamics. It is based on thermodynamic principles, such as energy conservation and heat transfer from a higher temperature region to a lower temperature region. The most common refrigeration cycle is the steam evolution cycle. It involves four main steps: upgrades, condensing, expanding, and evaporating. The study and understanding of thermodynamics are essential for designing efficient refrigeration systems, improving energy efficiency and understanding the behavior of refrigeration systems under different operating conditions. 2nd Step: Evaluate the performance of Refrigerator 2. Refrigerator 2 is a refrigerator that operates as an ideal vapor refrigeration cycle, and uses the same refrigerant fluid and the same evaporation and condensation temperatures as Refrigerator 1. In Refrigerator 2, the working fluid must be admitted by the compressor only in the form of saturated vapor, and must leave the compressor in the form of superheated vapor with an enthalpy equal to 1640 kJ/kg. Differently from Refrigerator 1, the cycle operates with an expansion valve (isenthalpic process). For this 2nd step, you must determine the following design parameters: a) The rate of cooling and the rate of heat rejection in the condenser. b) The power of the compressor; c) The COP of the cycle. For the energy balance, make the following considerations: - Permanent regime; - Variation of kinetic and potential energy are negligible; - Compressor and expansion valve operate adiabatically; - Evaporation and condensation steps do not involve work. Please do it in a typeable way, handwriting makes it difficult to understand.
The study and understanding of thermodynamics are essential for designing efficient refrigeration systems, improving energy efficiency and understanding the behavior of refrigeration systems under different operating conditions.
2nd Step: Evaluate the performance of Refrigerator 2.
Refrigerator 2 is a refrigerator that operates as an ideal vapor refrigeration cycle, and uses the same refrigerant fluid and the same evaporation and condensation temperatures as Refrigerator 1.
In Refrigerator 2, the working fluid must be admitted by the compressor only in the form of saturated vapor, and must leave the compressor in the form of superheated vapor with an enthalpy equal to 1640 kJ/kg. Differently from Refrigerator 1, the cycle operates with an expansion valve (isenthalpic process).
For this 2nd step, you must determine the following design parameters:
a) The rate of cooling and the rate of heat rejection in the condenser.
b) The power of the compressor;
c) The COP of the cycle.
For the energy balance, make the following considerations:
- Permanent regime;
- Variation of kinetic and potential energy are negligible;
- Compressor and expansion valve operate adiabatically;
- Evaporation and condensation steps do not involve work.
Please do it in a typeable way, handwriting makes it difficult to understand.
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