A commercial refrigerator with refrigerant-22 (R-22) as the working fluid is used to keep the refrigerated space at -25 °C by rejecting waste heat to cooling water that enters the condenser at 16 C at a rate of 0.3 kg/s and leaves at 36 °C. The refrigerant enters the condenser at 12 bar and 50 °C and leaves at the same pressure subcooled by 8.25 °C. If the compressor consumes 8 kW of power, determine a) The mass flow rate of the refrigerant, b) The refrigeration load, c) The COP, and d) The minimum power input to the compressor for the same refrigeration load.
A commercial refrigerator with refrigerant-22 (R-22) as the working fluid is used to keep the refrigerated space at -25 °C by rejecting waste heat to cooling water that enters the condenser at 16 C at a rate of 0.3 kg/s and leaves at 36 °C. The refrigerant enters the condenser at 12 bar and 50 °C and leaves at the same pressure subcooled by 8.25 °C. If the compressor consumes 8 kW of power, determine a) The mass flow rate of the refrigerant, b) The refrigeration load, c) The COP, and d) The minimum power input to the compressor for the same refrigeration load.
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:2. A commercial refrigerator with refrigerant-22 (R-22) as the working fluid
is used to keep the refrigerated space at -25 °C by rejecting waste heat to
cooling water that enters the condenser at 16 C at a rate of 0.3 kg/s and
leaves at 36 °C. The refrigerant enters the condenser at 12 bar and 50 °C
and leaves at the same pressure subcooled by 8.25 °C. If the compressor
consumes 8 kW of power, determine
a) The mass flow rate of the refrigerant,
b) The refrigeration load,
c) The COP, and
d) The minimum power input to the compressor for the same
refrigeration load.
Note: You may use Thermodynamics Tables by Michael J. Moran for this
question.
36°C
12 bar
8.25°C subcooled
Expansion
valve
Condenser
Evaporator
PL
Water
16°C
12 bar
50°C
Compressor
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