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Refrigerant-134a at 140 kPa and -10°C is compressed by an
Chapter 7, Problem 193P(choose chapter or problem)
Problem 193P
Refrigerant-134a at 140 kPa and -10°C is compressed by an adiabatic 1.3-kW compressor to an exit state of 700 kPa and 60°C. Neglecting the changes in kinetic and potential energies, determine (a) the isentropic efficiency of the compressor, (b) the volume flow rate of the refrigerant at the compressor inlet, in L/min, and (c) the maximum volume flow rate at the inlet conditions that this adiabatic 1.3-kW compressor can handle without violating the second law.
Questions & Answers
QUESTION:
Problem 193P
Refrigerant-134a at 140 kPa and -10°C is compressed by an adiabatic 1.3-kW compressor to an exit state of 700 kPa and 60°C. Neglecting the changes in kinetic and potential energies, determine (a) the isentropic efficiency of the compressor, (b) the volume flow rate of the refrigerant at the compressor inlet, in L/min, and (c) the maximum volume flow rate at the inlet conditions that this adiabatic 1.3-kW compressor can handle without violating the second law.
ANSWER:
Step by step solution Step 1 of 5Find the isentropic efficiency of the compressorHere, isentropic efficiency is , isentropic enthalpy at exit is , actual enthalpy at exitis and enthalpy is .From the superheated refrigerant -134a table, select the following properties ofrefrigerant at pressure of 140 kPa and temperature of -10 CMolar volume,Initial enthalpy,Initial entropy,From the superheated refrigerant -134a pressure table, select the actually enthalpy atexit at pressure of and temperature of as