A refrigerated room is kept at -18 °C by a vapor-compression cycle with R-134a as the refrigerant. Heat is rejected to cooling water that enters the condenser at 14 °C at a rate of 0.35 kg/s and leaves at 22 °C. The refrigerant enters the condenser at 1.2 MPa and 50°C and leaves at the same pressure subcooled by 5 °C. If the compressor consumes 5.5 kW of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load and the COP, (c) the second-law efficiency of the refrigerator and the total exergy destruction in the cycle, and (d) the exergy destruction in the condenser. Take specific heat of water to be 4.18 kJ/kg-°C.
A refrigerated room is kept at -18 °C by a vapor-compression cycle with R-134a as the refrigerant. Heat is rejected to cooling water that enters the condenser at 14 °C at a rate of 0.35 kg/s and leaves at 22 °C. The refrigerant enters the condenser at 1.2 MPa and 50°C and leaves at the same pressure subcooled by 5 °C. If the compressor consumes 5.5 kW of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load and the COP, (c) the second-law efficiency of the refrigerator and the total exergy destruction in the cycle, and (d) the exergy destruction in the condenser. Take specific heat of water to be 4.18 kJ/kg-°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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A refrigerated room is kept at −18◦C by a vapor-compression cycle with R-134a as the refrigerant. Heat is rejected to cooling water that enters the condenser at 14◦C at a rate of 0.35 kg/s and leaves at 22◦C. The refrigerant enters the condenser at 1.2MPa and 50◦C and leaves at the same pressure subcooled by 5◦C. If the compressor consumes 5.5 kW of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load and the COP, (c) the second-law efficiency of the refrigerator and the total exergy destruction in the cycle, and (d) the exergy destruction in the condenser. Take specific heat of water to be 4.18 kJ/kg·◦C.
Transcribed Image Text:A refrigerated room is kept at -18 °C by a vapor-compression cycle with R-134a as the
refrigerant. Heat is rejected to cooling water that enters the condenser at 14 °C at a rate of
0.35 kg/s and leaves at 22 °C. The refrigerant enters the condenser at 1.2 MPa and 50°C
and leaves at the same pressure subcooled by 5°C. If the compressor consumes 5.5 kW of
power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load and the
COP, (c) the second-law efficiency of the refrigerator and the total exergy destruction in
the cycle, and (d) the exergy destruction in the condenser. Take specific heat of water to be
4.18 kJ/kg-°C.
1.2 MPa
5 °C subcool
Expansion
valve
22 °C
QH
Condenser
Compressor
Evaporator
QL
Water
14 °C
1.2 MPa
50 °C
Win
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