Nitrogen is liquefied in the process shown in Figure Q 2 Nitrogen gas is fed at 25 C, 1 bar (stream 1) The gas is compressed to 180 bar in a compressor with an efficiency of 85 The pre cooler uses ambient water as cooling medium and cools the nitrogen to 30 C The cooler uses cold vapor from the separator as the cooling medium, this vapor leaves the cooler at 20 C (stream 9) Perform the energy and entropy balances on the basis of 1 kg s of liquid nitrogen produced Dordo precooler cooler Figure Q2 a Construct a table and write all the known PT, H and S for streams 1 9 4 marks b Write an energy balance around a subsystem defines by the cooler, throttling valve and separator 3 marks c What is the liquid and vapour fraction in stream 6 2 marks d Calculate the entropy and enthalpy of stream 6 4 marks e Find the T, H and S before and after the compressor 4 marks f Calculate the energy balance using the steady state energy balance for each equipment in the system 4 marks Calculate the entropy balance using the steady state energy balance equation for each equipment in the system 4 marks 19 1 EKC 222 Appendix 10000 8000 Span, R , Lemmon, E W Jacobsen, RT, Wagner, W , and Yokozeki, A A Reference Quality , , 7000 Thermodynamic Property Formulation for Nitrogen J Phys Chem Ref Data, 29(6) 1361 1433, 2000 6000 5000 4000 I 3000 2000 Nitrogen Pressure Enthalpy Diagram Datum Compound at reference conditions H(sat liq ) 0, S (sat liq ) 0 T Temperature, F S Specific Entropy, Btu ib F V Specific Volume, ftib plotis P , V 0 4 1900 02 0 55 0 75 700 600 ST 500 ir 400 llit 300 200 280 Pressure, psia LU HASA Borsa 60 80 70 50 10 I Li 320 40 V50 400 30 1 1 1 1 17 20 WIB LIV11 1 1 1 1 11 tirin 101 LE 1 1 6 TUTT 7 71 5 EURTIT 4E1, 316 1 1 11 L 1 1701111 LIVIUrilli 2ETTTTTTF DAN Oooo00000 oooo o 1975 100 11 11 V 140 200 0 50 100 150 200 250 300 350 400 Enthalpy, Btu b 24 25 By Virtual Materials Group, Inc NITROGEN Fig 24 22 Nitrogen P H Diagram SULIT

Question

Nitrogen is liquefied in the process shown in Figure Q 2  Nitrogen gas is fed at 25 C, 1 bar (stream 1)  The gas is compressed to 180 bar in a compressor with an efficiency of 85   The pre cooler uses ambient water as cooling medium and cools the nitrogen to 30 C  The cooler uses cold vapor from the separator as the cooling medium, this vapor leaves the cooler at 20 C (stream 9)  Perform the energy and entropy balances on the basis of 1 kg s of liquid nitrogen produced   Dordo precooler cooler Figure Q2  a  Construct a table and write all the known   PT, H and S for streams 1 9   4 marks   b  Write an energy balance around a subsystem defines by the cooler, throttling valve and separator   3 marks   c  What is the liquid and vapour fraction in stream 6   2 marks   d  Calculate the entropy and enthalpy of stream 6   4 marks   e  Find the T, H and S before and after the compressor   4 marks   f  Calculate the energy balance using the steady state energy balance for each equipment in the system   4 marks  Calculate the entropy balance using the steady state energy balance equation for each equipment in the system   4 marks  19   1    EKC 222  Appendix 10000 8000 Span, R , Lemmon, E W  Jacobsen, RT, Wagner, W , and Yokozeki, A   A Reference Quality , , 7000 Thermodynamic Property Formulation for Nitrogen   J  Phys  Chem  Ref  Data, 29(6) 1361 1433, 2000  6000 5000 4000 I 3000   2000  Nitrogen Pressure Enthalpy Diagram Datum Compound at reference conditions H(sat  liq )   0, S (sat  liq )   0 T   Temperature, F S   Specific Entropy, Btu ib F V Specific Volume, ftib   plotis P , V 0 4 1900  02  0 55 0 75 700 600 ST 500 ir 400 llit 300 200  280 Pressure, psia LU HASA Borsa 60 80 70 50   10   I Li    320 40   V50 400 30      1 1 1 1 17 20 WIB LIV11 1 1 1 1 11 tirin 101 LE 1 1   6 TUTT 7 71 5 EURTIT 4E1,   316 1 1 11 L 1 1701111   LIVIUrilli 2ETTTTTTF DAN Oooo00000 oooo o 1975  100   11 11       V   140 200 0 50 100 150 200 250 300 350 400 Enthalpy, Btu b 24 25 By Virtual Materials Group, Inc  NITROGEN Fig  24 22  Nitrogen P H Diagram SULIT

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Nitrogen is liquefied in the process shown in Figure Q.2. Nitrogen gas is fed at 25 C, 1 bar (stream 1). The gas is compressed

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