A refrigerator using R134a produces 20 Tons of Refrigeration and operates between 0.12 MPa and 1.6 MPa as evaporating and condensing pressures respectively. Calculate the mass flow rate of refrigerant and COP. If an intercooler is introduced at a pressure of 0.9MPa, calculate the mass of refrigerant passing through evaporator and condenser and the power needed by the two compressors and the new COP. What percent is the saving in power? Sketch the cycles on P-h diagrams using point 1 at entry to the first compressor.

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.
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A refrigerator using R134a produces 20 Tons of Refrigeration and operates between 0.12 MPa and 1.6
MPa as evaporating and condensing pressures respectively. Calculate the mass flow rate of refrigerant
and COP. If an intercooler is introduced at a pressure of 0.9MPa, calculate the mass of refrigerant
passing through evaporator and condenser and the power needed by the two compressors and the
new COP. What percent is the saving in power? Sketch the cycles on P-h diagrams using point 1 at
entry to the first compressor.
Transcribed Image Text:A refrigerator using R134a produces 20 Tons of Refrigeration and operates between 0.12 MPa and 1.6 MPa as evaporating and condensing pressures respectively. Calculate the mass flow rate of refrigerant and COP. If an intercooler is introduced at a pressure of 0.9MPa, calculate the mass of refrigerant passing through evaporator and condenser and the power needed by the two compressors and the new COP. What percent is the saving in power? Sketch the cycles on P-h diagrams using point 1 at entry to the first compressor.
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