Refrigerant R12 is used in a vapour compression cycle. The saturated vapour enters the compressor at -18.8°C, and subsequently leaves at 75°C and 10 bar. The saturated liquid leaving the condenser is at 10 bar. The resulting stream is throttled and evaporated before being fed back to the compressor. a) Determine the coefficient of performance of the refrigerator. Take the specific enthalpy, h, at 10 bar and 36 K of superheat to be 163.7 kJ/kg b) Obtain the isentropic efficiency of the compressor. Take the specific entropy, s, at 10 bar to be 1.188 kJ/kg
Refrigerant R12 is used in a vapour compression cycle. The saturated vapour enters the compressor at -18.8°C, and subsequently leaves at 75°C and 10 bar. The saturated liquid leaving the condenser is at 10 bar. The resulting stream is throttled and evaporated before being fed back to the compressor. a) Determine the coefficient of performance of the refrigerator. Take the specific enthalpy, h, at 10 bar and 36 K of superheat to be 163.7 kJ/kg b) Obtain the isentropic efficiency of the compressor. Take the specific entropy, s, at 10 bar to be 1.188 kJ/kg
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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Refrigerant R12 is used in a vapour compression cycle. The saturated vapour enters
the compressor at -18.8°C, and subsequently leaves at 75°C and 10 bar. The
saturated liquid leaving the condenser is at 10 bar. The resulting stream is throttled
and evaporated before being fed back to the compressor.
a) Determine the coefficient of performance of the refrigerator. Take the specific enthalpy,
h, at 10 bar and 36 K of superheat to be 163.7 kJ/kg
b) Obtain the isentropic efficiency of the compressor. Take the specific entropy, s, at 10
bar to be 1.188 kJ/kg
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Step 1: Introduction
VIEWStep 2: schematic circuit, T-s diagram, and p-h diagram of the vapor compression refrigeration cycle
VIEWStep 3: Evaluate properties at all state points.
VIEWStep 4: (a) Evaluate coefficient of performance of the cycle.
VIEWStep 5: (b) The isentropic efficiency of the compressor
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