Refrigerant-134a at 1 MPa and 90°C is to be cooled to 1 MPa and 30°C in a condenser by air. The air enters at 100 kPa and 27°C with a volume flow rate of 560 m²³/min and leaves at 95 kPa and 60°C. Determine the mass flow rate of the refrigerant. The gas constant of air is 0.287 kPa.m ³/kg-K. The constant pressure specific heat of air is cp=1.005 kJ/kg.°C. The enthalpies of the R-134a at the inlet and the exit states are 324.66 kJ/kg and 93.58 kJ/kg. R-134a → P₁ = 1 MPa T₁ = 90°℃ Air V₂ m³/min |P3 = 100 kPa| T3=27°C | P₁ = 95 kPa T₁ = 60°C P₂ = 1 MPa T₂ = 30°C
Refrigerant-134a at 1 MPa and 90°C is to be cooled to 1 MPa and 30°C in a condenser by air. The air enters at 100 kPa and 27°C with a volume flow rate of 560 m²³/min and leaves at 95 kPa and 60°C. Determine the mass flow rate of the refrigerant. The gas constant of air is 0.287 kPa.m ³/kg-K. The constant pressure specific heat of air is cp=1.005 kJ/kg.°C. The enthalpies of the R-134a at the inlet and the exit states are 324.66 kJ/kg and 93.58 kJ/kg. R-134a → P₁ = 1 MPa T₁ = 90°℃ Air V₂ m³/min |P3 = 100 kPa| T3=27°C | P₁ = 95 kPa T₁ = 60°C P₂ = 1 MPa T₂ = 30°C
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Transcribed Image Text:Refrigerant-134a at 1 MPa and 90°C is to be cooled to 1 MPa and 30°C in a condenser by air. The air enters at 100 kPa and 27°C with a
volume flow rate of 560 m³/min and leaves at 95 kPa and 60°C. Determine the mass flow rate of the refrigerant. The gas constant of
air is 0.287 kPa.m³/kg.K. The constant pressure specific heat of air is cp=1.005 kJ/kg-°C. The enthalpies of the R-134a at the inlet and
the exit states are 324.66 kJ/kg and 93.58 kJ/kg.
R-134a
1
P₁ = 1 MPa
T₁ = 90°℃
Air
V₂ m³/min
|P3 = 100 kPa|
T3 = 27°C
| P₁ = 95 kPa
T₁ = 60°C
P₂ = 1 MPa
T₂ = 30°C
The mass flow rate of the refrigerant is
kg/min.
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