No. 1~3 were already answered. Proceed to no. 4 Solution:(a) Enthalpies at each point of the cycle in kJ/kgP-h diagram of the refrigeration system is shown in a figure belowhfirst, we have to calculate the enthalpies at the various point,State Point 5, 6, and 8:condenser exhaust at the 40°Ch5hf@40°C=249.71 kJ/kgafter the state point 5 refrigerant throttle to 6 and 8, thush6h8 249.71 kJ/kgState Point 7:Going through the evaporator A refrigerant will reach to saturated gas state, thush7 = hg@0°C = 404.87 kJ/kgfirst, we have to calculate the thheat absorbed in an evaporator A isthus,State Point 9:Going through the evaporator B refrigerant will reach to saturated gas state, thush9hg@-20°C = 396.67 kJ/kgh.State Point 1:enthalpy of the vapor mixture entering the first compressor after evaporation canbe calculated asth-m+State Point 2:40°C10°Ch₁:Tha+mafrom the R-22 Property table0°C-20°Cintercooling happens at 10°C,at the compressor exit at 10°C,mah+maham₂ + theQama(₂-₂)-505050(hy-h₂) 404.87-249.710.322 kg/s0.322-404.87+0.3-396.670.322 +0.3State Point 4:at the second compressor exit at 40°C,8₁1.7969 kJ/kgk8₂81.7969 kJ/kgkfrom the R-22 Property table @10°C and s2 = 1.7969 kl/kg-Kh₂425.65 kJ/kgState Point 3:consider the after the intercooling refrigerant will reach to saturated vapour statehy-h@10°C-408.6 kJ/kg$₂8@10°C 1.7377 kJ/kg-K(C) Total refrigeration capacity in TOR881.7377kJ/kgkfrom the R-22 Property table @40°C and 5= 1.7377 kl/kg-K400.91 kJ/kgh₂-427.74 kJ/kg(b) Total mass of refrigerant that circulates the system in kg/sm-ma+main-0.322 +0.3-0.622 kg/sQTQ+Q₂Q₁ + m₂(h₂h₂)Qr 50+ 0.3(396.67-249.71)-94.088 kW-26.753 TOR 5♫840°CR - 22QAA= 50 kW0°CmB = 0.3 kg/sB -20°C4Tin = 10°Cwwwww32The above refrigeration system uses R-22 as therefrigerant, determine:1. Enthalpies at each point of the cycle in kJ/kg2. Total mass of refrigerant that circulates the system inkg/s3. Total refrigerating capacity in TOR4. Total compressor power in kW5. Heat rejected in the condenser kW6. Heat rejected in the intercooler in kW7. Coefficient of Performance8. Draw the P-h DiagramNote: Show your SYSTEM BALANCING.

Given question is related to refrigeration. The enthalpy at various points have been given. […

5 8 40°C R-22 QAA = 50 kW 0°C MB = 0.3 kg/s B -20°C Tin = 10°C 9 www www 3 The above refrigeration system uses R-22 as the refrigerant, determine: 1. Enthalpies at each point of the cycle in kJ/kg 2. Total mass of refrigerant that circulates the system in kg/s 3. Total refrigerating capacity in TOR 4. Total compressor power in kW 5. Heat rejected in the condenser kW 6. Heat rejected in the intercooler in kW 7. Coefficient of Performance 8. Draw the P-h Diagram