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3. A refrigeration system utilizing refrigerant R134a as the working fluid is engineering data are provided for your convenience: i. The system is operated to maintain the refrigerated space at -30°C ii. The inlet state of the compressor is 60 kPa and -34°C while gaining a net heat of 0.450 kW (Qin) from the surrounding iii. The exit temperature and pressure of the compressor are 65°C and 1.2 MPa iv. The cooling water enters and exits the condenser at 18°C and 26°C with a mass flow rate of 0.25kg/s v. The exit temperature of the condenser is 42°C vi. The h₁ = 230.04 kJ/kg, h2 = 295.18 kJ/kg, h3=111.28 = h4 vii. The water inlet and outlet enthalpy to cool the condenser are hw1,18°c = 75.47 kJ/kg and hw2,26°C 108.94 kJ/kg etermine (a) the actual enthalpy at state 2 with aid of interpolation, (b) the enthalpy at state 4, (c) the ality of the refrigerant at the evaporator inlet and the enthalpy at state 4, (d) the mass flow rate of the frigerant, (e) the waste heat transferred from the refrigerant, the compressor power input, and the Frigeration load of the thermal system using an energy balance, and (f) the COP of the refrigerator.

3. A refrigeration system utilizing refrigerant R134a as the working fluid is engineering data are provided for your convenience: i. The system is operated to maintain the refrigerated space at -30°C ii. The inlet state of the compressor is 60 kPa and -34°C while gaining a net heat of 0.450 kW (Qin) from the surrounding iii. The exit temperature and pressure of the compressor are 65°C and 1.2 MPa iv. The cooling water enters and exits the condenser at 18°C and 26°C with a mass flow rate of 0.25kg/s v. The exit temperature of the condenser is 42°C vi. The h₁ = 230.04 kJ/kg, h2 = 295.18 kJ/kg, h3=111.28 = h4 vii. The water inlet and outlet enthalpy to cool the condenser are hw1,18°c = 75.47 kJ/kg and hw2,26°C 108.94 kJ/kg etermine (a) the actual enthalpy at state 2 with aid of interpolation, (b) the enthalpy at state 4, (c) the ality of the refrigerant at the evaporator inlet and the enthalpy at state 4, (d) the mass flow rate of the frigerant, (e) the waste heat transferred from the refrigerant, the compressor power input, and the Frigeration load of the thermal system using an energy balance, and (f) the COP of the refrigerator.

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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Not Ai generated please show all steps Instead of enthalpy its internal energy
3. A refrigeration system utilizing refrigerant R134a as the working fluid is considered. The following engineering data are provided for your convenience: i. The system is operated to maintain the refrigerated space at -30°C ii. The inlet state of the compressor is 60 kPa and -34°C while gaining a net heat of 0.450 kW (Qin) from the surrounding iii. The exit temperature and pressure of the compressor are 65°C and 1.2 MPa iv. The cooling water enters and exits the condenser at 18°C and 26°C with a mass flow rate of 0.25kg/s v. The exit temperature of the condenser is 42°C vi. The h₁ = 230.04 kJ/kg, h₂ = 295.18 kJ/kg, h3 =111.28 = h4 vii. The water inlet and outlet enthalpy to cool the condenser are hw1,18°C = 75.47 kJ/kg and hw2,26°C 108.94 kJ/kg Determine (a) the actual enthalpy at state 2 with aid of interpolation, (b) the enthalpy at state 4, (c) the quality of the refrigerant at the evaporator inlet and the enthalpy at state 4, (d) the mass flow rate of the refrigerant, (e) the waste heat transferred from the refrigerant, the compressor power input, and the refrigeration load of the thermal system using an energy balance, and (f) the COP of the refrigerator.
Transcribed Image Text:3. A refrigeration system utilizing refrigerant R134a as the working fluid is considered. The following engineering data are provided for your convenience: i. The system is operated to maintain the refrigerated space at -30°C ii. The inlet state of the compressor is 60 kPa and -34°C while gaining a net heat of 0.450 kW (Qin) from the surrounding iii. The exit temperature and pressure of the compressor are 65°C and 1.2 MPa iv. The cooling water enters and exits the condenser at 18°C and 26°C with a mass flow rate of 0.25kg/s v. The exit temperature of the condenser is 42°C vi. The h₁ = 230.04 kJ/kg, h₂ = 295.18 kJ/kg, h3 =111.28 = h4 vii. The water inlet and outlet enthalpy to cool the condenser are hw1,18°C = 75.47 kJ/kg and hw2,26°C 108.94 kJ/kg Determine (a) the actual enthalpy at state 2 with aid of interpolation, (b) the enthalpy at state 4, (c) the quality of the refrigerant at the evaporator inlet and the enthalpy at state 4, (d) the mass flow rate of the refrigerant, (e) the waste heat transferred from the refrigerant, the compressor power input, and the refrigeration load of the thermal system using an energy balance, and (f) the COP of the refrigerator.
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