HW7_solution

# HW7_solution - Homework 7 solution In HYSYS 1 7.186e-2 2 The efficiency of this process is not good 4 Decreasing temperature of stream 8 causes

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Homework 7 solution In HYSYS, 1. 7.186e-2 2. The efficiency of this process is not good. 4. Decreasing temperature of stream 8 causes decrease of efficiency. Using methane chart, 27C: Stream 3: P=6000kPa, T=27C=80.6F, H3=1150 kJ/kg Stream 8: P=100kPa, T=26.99C=80.6F, H8=1200 kJ/kg H4=H5, Stream 6: saturated liquid, H6=300 kJ/mol Stream 7: saturated vapor, H7=800 kJ/mol System energy balance: H3=H6*x+H8*(1-x) x=0.0556 5C: Only stream 8 changes: P=100kPa, T=5C=41.0F, H8=1160 kJ/kg System energy balance: H3=H6*x+H8*(1-x) x=0.0116 HYSYS calculation is much more accurate than using the chart. However, since HYSYS calculation is often based on semi-empirical EOS, chart calculation is closer to the real value. But the error from HYSYS can be minimized by choosing proper EOS, while the error from chart calculation is difficult to mitigate.

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Thu Oct 25 11:39:09 2007 Case: C:\Program Files\AspenTech\Aspen HYSYS 2006\Cases\chen.hsc Flowsheet: Case (Main) E-100 VLV-100 RCY-1 R V-100 Str4B Str5 Str7
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## This note was uploaded on 05/10/2008 for the course CHBE 2110 taught by Professor Gallivan during the Spring '08 term at Georgia Institute of Technology.

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HW7_solution - Homework 7 solution In HYSYS 1 7.186e-2 2 The efficiency of this process is not good 4 Decreasing temperature of stream 8 causes

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