A vapor compression refrigerator using R134a as the refrigerant operates under the following conditions: The refrigerant condenses at 50°C and is then sub-cooled by 10°C to 30°C before expansion. After an isenthalpic expansion, the refrigerant evaporates at -20°C and then superheated by 10°C to 0°C before compression. The refrigerant is compressed to 70°C with entropy of 1.0 kJ/kg.K at the end of the compression. a)With reference to the above operating conditions, draw the cycle on the R134a p-h diagram. b)Calculate the specific refrigerating effect at the evaporating temperature of -20°C. c)Calculate the work input for the compression process. d)Prove the vapor compression is not an isentropic process. e) Calculate the COP of the cycle. f)To produce 5kW cooling, what is the refrigerant flow rate required?
A vapor compression refrigerator using R134a as the refrigerant operates under the following conditions: The refrigerant condenses at 50°C and is then sub-cooled by 10°C to 30°C before expansion. After an isenthalpic expansion, the refrigerant evaporates at -20°C and then superheated by 10°C to 0°C before compression. The refrigerant is compressed to 70°C with entropy of 1.0 kJ/kg.K at the end of the compression. a)With reference to the above operating conditions, draw the cycle on the R134a p-h diagram. b)Calculate the specific refrigerating effect at the evaporating temperature of -20°C. c)Calculate the work input for the compression process. d)Prove the vapor compression is not an isentropic process. e) Calculate the COP of the cycle. f)To produce 5kW cooling, what is the refrigerant flow rate required?
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:A vapor compression refrigerator using R134a as the refrigerant operates under the
following conditions: The refrigerant condenses at 50°C and is then sub-cooled by 10°C to
30°C before expansion. After an isenthalpic expansion, the refrigerant evaporates at -20°C
and then superheated by 10°C to 0°C before compression. The refrigerant is compressed
to 70°C with entropy of 1.0 kJ/kg.K at the end of the compression.
a)With reference to the above operating conditions, draw
the cycle on the R134a p-h diagram.
b)Calculate the specific refrigerating effect at the
evaporating temperature of -20°C.
c)Calculate the work input for the compression process.
d)Prove the vapor compression is not an isentropic process.
e) Calculate the COP of the cycle.
f)To produce 5kW cooling, what is the refrigerant flow rate
required?
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Step 1: Given data
VIEWStep 2: Evaluating the properties at states and P-h diagram
VIEWStep 3: Calculation of specific refreigerating effect
VIEWStep 4: Work Input for the Compression Process
VIEWStep 5: Proving Non-Isentropic Process
VIEWStep 6: Calculation of COP
VIEWStep 7: Refrigerant Flow Rate
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