source: branches/gui/eml/streams.mso @ 721

Last change on this file since 721 was 694, checked in by gerson bicca, 14 years ago

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1#*-------------------------------------------------------------------
2* EMSO Model Library (EML) Copyright (C) 2004 - 2007 ALSOC.
3*
4* This LIBRARY is free software; you can distribute it and/or modify
5* it under the therms of the ALSOC FREE LICENSE as available at
6* http://www.enq.ufrgs.br/alsoc.
7*
8* EMSO Copyright (C) 2004 - 2007 ALSOC, original code
9* from http://www.rps.eng.br Copyright (C) 2002-2004.
10* All rights reserved.
11*
12* EMSO is distributed under the therms of the ALSOC LICENSE as
13* available at http://www.enq.ufrgs.br/alsoc.
14*
15*--------------------------------------------------------------------
16* Model of basic streams
17*----------------------------------------------------------------------
18* Author: Paula B. Staudt and Rafael de P. Soares
19* $Id: streams.mso 694 2008-11-24 00:39:38Z bicca $
20*---------------------------------------------------------------------*#
21
22using "types";
23
24Model stream
25        ATTRIBUTES
26        Pallete = false;
27        Brief = "General Material Stream";
28        Info =
29        "This is the basic building block for the EML models.
30        Every model should have input and output streams derived
31        from this model.";
32       
33        PARAMETERS
34        outer NComp as Integer (Brief = "Number of chemical components", Lower = 1);
35
36        VARIABLES
37        F as flow_mol                   (Brief = "Stream Molar Flow Rate");
38        T as temperature                (Brief = "Stream Temperature");
39        P as pressure                   (Brief = "Stream Pressure");
40        h as enth_mol                   (Brief = "Stream Enthalpy");
41        v as fraction                   (Brief = "Vapourization fraction");
42        z(NComp) as fraction    (Brief = "Stream Molar Fraction");
43end
44
45Model liquid_stream as stream
46        ATTRIBUTES
47        Pallete = false;
48        Brief = "Liquid Material Stream";
49        Info =
50        "Model for liquid material streams.
51        This model should be used only when the phase of the stream
52        is known ''a priori''.";
53
54        PARAMETERS
55        outer PP as Plugin(Brief = "External Physical Properties", Type="PP");
56       
57        EQUATIONS
58        "Liquid Enthalpy"
59        h = PP.LiquidEnthalpy(T, P, z);
60        "Liquid stream"
61        v = 0;
62end
63
64Model vapour_stream as stream
65        ATTRIBUTES
66        Pallete = false;
67        Brief = "Vapour Material Stream";
68        Info =
69        "Model for vapour material streams.
70        This model should be used only when the phase of the stream
71        is known ''a priori''.";
72
73        PARAMETERS
74        outer PP as Plugin(Brief = "External Physical Properties", Type="PP");
75       
76        EQUATIONS
77        "Vapour Enthalpy"
78        h = PP.VapourEnthalpy(T, P, z);
79        "Vapour stream"
80        v = 1;
81end
82
83Model streamPH as stream
84        ATTRIBUTES
85        Brief = "Stream with built-in flash calculation";
86        Info = "
87        This model should be used when the vaporization fraction
88        is unknown.
89       
90        The built-in flash calculation will determine the stream
91        state as a function of the overall composition '''z''', the
92        pressure '''P''' and the enthalpy '''h'''.
93       
94        Additionally, the liquid composition '''x''' and the vapor
95        composition '''y''' are calculated.     
96        ";
97        Pallete = false;
98       
99        PARAMETERS
100        outer PP as Plugin(Brief = "External Physical Properties", Type="PP");
101       
102        VARIABLES
103        x(NComp) as fraction    (Brief = "Liquid Molar Fraction",Hidden=true);
104        y(NComp) as fraction    (Brief = "Vapour Molar Fraction",Hidden=true);
105
106        EQUATIONS
107        "Flash Calculation"
108        [v, x, y] = PP.FlashPH(P, h, z);
109       
110        "Enthalpy"
111        h = (1-v)*PP.LiquidEnthalpy(T, P, x) + v*PP.VapourEnthalpy(T, P, y);
112       
113end
114
115Model streamPHS as streamPH
116        ATTRIBUTES
117        Brief = "Stream with built-in flash calculation";
118        Info = "
119        This model should be used when the vaporization fraction
120        is unknown.
121       
122        The built-in flash calculation will determine the stream
123        state as a function of the overall composition '''z''', the
124        pressure '''P''' and the enthalpy '''h'''.
125       
126        Additionally, the liquid composition '''x''', the vapor
127        composition '''y''' and the stream entropy are calculated.     
128        ";
129        Pallete = false;
130       
131PARAMETERS
132        outer PP as Plugin(Brief = "External Physical Properties", Type="PP");
133       
134VARIABLES
135        s as entr_mol   (Brief = "Stream Entropy");
136
137EQUATIONS
138
139"Entropy"
140        s = (1-v)*PP.LiquidEntropy(T, P, x) +   v*PP.VapourEntropy(T, P, y);
141       
142end
143
144Model sink
145        ATTRIBUTES
146        Pallete = true;
147        Icon = "icon/Sink";
148        Brief = "Material stream sink";
149        Info = "
150        This model should be used for boundary streams when additional
151        information about the stream is desired.
152
153        Some of the additional informations calculated by this models are:
154         * Mass density
155         * Mass flow
156         * Mass compostions
157         * Specific volume
158         * Vapour fraction
159         * Volumetric flow
160         * Liquid and Vapour compositions
161        ";
162
163        PARAMETERS
164        outer PP                        as Plugin               (Brief = "External Physical Properties", Type="PP");
165        outer NComp             as Integer              (Brief = "Number of chemical components", Lower = 1);
166                  M(NComp)      as molweight    (Brief = "Component Mol Weight");
167       
168        SET
169
170        M   = PP.MolecularWeight();
171       
172        VARIABLES
173        in Inlet                as stream               (Brief = "Inlet Stream", PosX=0, PosY=0.5308, Protected=true,Symbol="_{in}");
174        v                               as fraction             (Brief = "Vapourization fraction",Hidden=true);
175        x(NComp)                as fraction             (Brief = "Liquid Molar Fraction",Hidden=true);
176        y(NComp)                as fraction             (Brief = "Vapour Molar Fraction",Hidden=true);
177        zmass(NComp)    as fraction             (Brief = "Mass Fraction");
178        Mw                              as molweight    (Brief = "Average Mol Weight");
179        vm                              as volume_mol   (Brief = "Molar Volume");       
180        rho                             as dens_mass    (Brief = "Stream Mass Density");
181        rhom                    as dens_mol             (Brief = "Stream Molar Density");
182        Fw                              as flow_mass    (Brief = "Stream Mass Flow");
183        Fvol            as flow_vol     (Brief = "Volumetric Flow");
184        T_Cdeg                  as temperature  (Brief = "Temperature in °C", Lower=-200);
185
186        EQUATIONS
187        "Flash Calculation"
188        [v, x, y] = PP.FlashPH(Inlet.P, Inlet.h, Inlet.z);
189       
190        "Average Molecular Weight"
191        Mw = sum(M*Inlet.z);
192
193        "Molar Density"
194                rhom * vm = 1;
195               
196        "Mass or Molar Density"
197        rhom * Mw = rho;
198
199        "Flow Mass"
200        Fw      =  Mw*Inlet.F;
201
202        "Molar Volume"
203        vm = (1-v)*PP.LiquidVolume(Inlet.T, Inlet.P, x) + v*PP.VapourVolume(Inlet.T,Inlet.P,y);
204       
205        "Volumetric Flow"
206        Fvol = Inlet.F*vm ;
207       
208        "Mass Fraction"
209        zmass = M*Inlet.z / Mw;
210       
211        "Temperature in °C"
212        T_Cdeg = Inlet.T - 273.15 * 'K';
213
214end
215
216Model simple_sink
217        ATTRIBUTES
218        Pallete = true;
219        Icon = "icon/Sink";
220        Brief = "Simple material stream sink";
221        Info = "
222        This model should be used for boundary streams when no additional
223        information about the stream is desired.
224        ";
225       
226        VARIABLES
227        in Inlet                as stream       (Brief = "Inlet Stream", PosX=0, PosY=0.5308, Protected=true,Symbol="_{in}");
228end
229
230Model energy_source
231        ATTRIBUTES
232        Pallete = true;
233        Icon = "icon/energy_source";
234        Brief = "Energy stream source";
235
236        VARIABLES
237        out OutletQ             as power(Brief = "Outlet energy stream", PosX=1, PosY=0.46, Symbol="_{out}");
238
239end
240
241Model work_source
242        ATTRIBUTES
243        Pallete = true;
244        Icon = "icon/work_source";
245        Brief = "Work stream source";
246
247        VARIABLES
248        out Work                as power(Brief = "Outlet work stream", PosX=1, PosY=0.46, Symbol="_{out}");
249
250end
251
252Model info_stream
253        ATTRIBUTES
254        Pallete = true;
255        Icon = "icon/Info_Stream";
256        Brief = "Material stream information";
257        Info = "
258        This model should be used for middle streams when additional
259        information about the stream is desired.
260
261        Some of the additional informations calculated by this models are:
262         * Mass density
263         * Mass flow
264         * Mass compostions
265         * Specific volume
266         * Vapour fraction
267         * Volumetric flow
268         * Liquid and Vapour compositions
269         * Viscosity
270         * Heat Capacity
271         * Thermal Conductivity
272         * Temperature in Celsius Degrees
273        ";
274
275PARAMETERS
276        outer PP                        as Plugin                       (Brief = "External Physical Properties", Type="PP");
277        outer NComp     as Integer                      (Brief = "Number of chemical components", Lower = 1);
278                  M(NComp)      as molweight    (Brief = "Component Mol Weight");
279       
280SET
281
282        M   = PP.MolecularWeight();
283       
284VARIABLES
285
286        in      Inlet           as stream               (Brief = "Inlet Stream", PosX=0, PosY=0.5308, Protected=true , Symbol="_{in}");
287        out     Outlet          as stream               (Brief = "Outlet Stream", PosX=1, PosY=0.5308, Protected=true , Symbol="_{out}");
288       
289        v                                               as fraction                     (Brief = "Vapourization fraction",Hidden=true);
290        x(NComp)                        as fraction                     (Brief = "Liquid Molar Fraction",Hidden=true);
291        y(NComp)                        as fraction                     (Brief = "Vapour Molar Fraction",Hidden=true);
292       
293        Fw                                      as flow_mass            (Brief = "Stream Mass Flow",Protected=true);
294        Fvol                            as flow_vol             (Brief = "Volumetric Flow",Protected=true);
295        T_Cdeg                          as temperature          (Brief = "Temperature in °C", Lower=-200,Protected=true);
296
297        Mu                                      as viscosity            (Brief="Stream Viscosity",Lower=0.0001, Symbol = "\mu",Protected=true);
298        Cp                                      as cp_mol                       (Brief="Stream Molar Heat Capacity", Upper=1e10,Protected=true);       
299        K                                               as conductivity         (Brief="Stream Thermal Conductivity", Default=1.0, Lower=1e-5, Upper=500,Protected=true);
300        Mw                                      as molweight            (Brief = "Average Mol Weight",Protected=true);
301        vm                                      as volume_mol   (Brief = "Molar Volume",Protected=true);       
302        rho                                     as dens_mass            (Brief = "Stream Mass Density",Protected=true);
303        rhom                                    as dens_mol             (Brief = "Stream Molar Density",Protected=true);
304        s                                               as entr_mol             (Brief = "Stream Entropy",Protected=true);
305        zmass(NComp)    as fraction                     (Brief = "Mass Fraction",Protected=true);
306       
307EQUATIONS
308
309"Flash Calculation"
310        [v, x, y] = PP.FlashPH(Inlet.P, Inlet.h, Inlet.z);
311       
312"Average Molecular Weight"
313        Mw = sum(M*Inlet.z);
314
315"Mass Density"
316        rho * ((1-v)/PP.LiquidDensity(Inlet.T,Inlet.P,x) + v/PP.VapourDensity(Inlet.T,Inlet.P,y)) = 1;
317       
318"Mass or Molar Density"
319        rhom * Mw = rho;
320
321"Flow Mass"
322        Fw      =  Mw*Inlet.F;
323
324"Molar Volume"
325        vm = (1-v)*PP.LiquidVolume(Inlet.T, Inlet.P, x) + v*PP.VapourVolume(Inlet.T,Inlet.P,y);
326       
327"Volumetric Flow"
328        Fvol = Inlet.F*vm ;
329       
330"Mass Fraction"
331        zmass = M*Inlet.z / Mw;
332
333"Stream Heat Capacity"
334        Cp      =       (1-v)*PP.LiquidCp(Inlet.T, Inlet.P, x) + v*PP.VapourCp(Inlet.T,Inlet.P,y);
335
336"Stream Viscosity"
337        Mu      =       (1-v)*PP.LiquidViscosity(Inlet.T, Inlet.P, x) + v*PP.VapourViscosity(Inlet.T,Inlet.P,y);
338
339"Stream ThermalConductivity"
340        K       =       (1-v)*PP.LiquidThermalConductivity(Inlet.T, Inlet.P, x) + v*PP.VapourThermalConductivity(Inlet.T,Inlet.P,y);
341
342"Stream Overall Entropy"
343        s = (1-v)*PP.LiquidEntropy(Inlet.T, Inlet.P, x) + v*PP.VapourEntropy(Inlet.T, Inlet.P, y);
344       
345"Temperature in °C"
346        T_Cdeg = Inlet.T - 273.15 * 'K';
347
348"Outlet Flow"
349        Outlet.F = Inlet.F;
350
351"Outlet Temperature"
352        Outlet.T = Inlet.T;
353
354"Outlet Pressure"
355        Outlet.P = Inlet.P;
356
357"Outlet Vapour Fraction"
358        Outlet.v = Inlet.v;
359
360"Outlet Enthalpy"
361        Outlet.h = Inlet.h;
362
363"Outlet Composition"
364        Outlet.z= Inlet.z;
365
366end
367
368Model source
369
370ATTRIBUTES
371        Pallete = true;
372        Icon = "icon/Source";
373        Brief = "Material stream source";
374        Info = "
375        This model should be used for boundary streams.
376        Usually these streams are known and come from another process
377        units.
378
379        The user should specify:
380         * Total molar (mass or volumetric) flow
381         * Temperature
382         * Pressure
383         * Molar or mass composition
384       
385        No matter the specification set, the model will calculate some
386        additional properties:
387         * Mass density
388         * Mass flow
389         * Mass compostions
390         * Specific volume
391         * Vapour fraction
392         * Volumetric flow
393         * Liquid and Vapour compositions
394        ";
395
396PARAMETERS
397        outer PP                                                as Plugin                       (Brief = "External Physical Properties", Type="PP");
398        outer NComp                             as Integer                      (Brief = "Number of chemical components", Lower = 1);
399                  M(NComp)                              as molweight    (Brief = "Component Mol Weight");
400                  CompositionBasis              as Switcher             (Brief = "Molar or Mass Composition", Valid = ["Molar", "Mass"], Default="Molar");
401                  ValidPhases                           as Switcher             (Brief = "Valid Phases for Flash Calculation", Valid = ["Vapour-Only", "Liquid-Only","Vapour-Liquid"], Default="Vapour-Liquid");
402       
403
404SET
405
406        M   = PP.MolecularWeight();
407
408VARIABLES
409
410        out Outlet                      as stream                       (Brief = "Outlet stream", PosX=1, PosY=0.5256, Symbol="_{out}",Protected=true);
411       
412        Composition(NComp) as fraction                  (Brief = "Stream Composition");
413        SumOfComposition as positive                    (Brief = "Sum of Stream Composition",Protected=true);
414        F                                                               as flow_mol             (Brief = "Stream Molar Flow Rate");
415        Fw                                                      as flow_mass            (Brief = "Stream Mass Flow");
416        Fvol                                    as flow_vol        (Brief = "Volumetric Flow");
417        T                                                               as temperature  (Brief = "Stream Temperature");
418        T_Cdeg                                          as temperature  (Brief = "Temperature in °C", Lower=-200);
419        P                                                               as pressure             (Brief = "Stream Pressure");
420       
421        x(NComp)                        as fraction                     (Brief = "Liquid Molar Fraction",Hidden=true);
422        y(NComp)                        as fraction                     (Brief = "Vapour Molar Fraction",Hidden=true);
423       
424        Mw                                              as molweight                    (Brief = "Average Mol Weight",Protected=true);
425        vm                                              as volume_mol           (Brief = "Molar Volume",Protected=true);       
426        rho                                             as dens_mass                    (Brief = "Stream Mass Density",Protected=true);
427        rhom                                            as dens_mol                     (Brief = "Stream Molar Density",Protected=true);
428       
429        zmass(NComp)            as fraction                             (Brief = "Mass Fraction",Protected=true);
430       
431        EQUATIONS
432
433switch CompositionBasis
434
435        case "Molar":
436"Stream Molar Composition"
437        Outlet.z = Composition/sum(Composition);
438
439"Stream Mass Composition"
440        zmass = M*Outlet.z / Mw;
441
442        case "Mass":
443"Stream Mass Composition"
444        zmass = Composition/sum(Composition);
445
446"Stream Molar Composition"
447        Outlet.z*sum(zmass/M) = zmass/M;
448
449end
450
451switch ValidPhases
452       
453        case "Liquid-Only":
454
455"Vapour Fraction"
456        Outlet.v = 0;
457
458"Liquid Composition"
459        x = Outlet.z;
460
461"Vapour Composition"
462        y = Outlet.z;
463
464"Overall Enthalpy"
465        Outlet.h = PP.LiquidEnthalpy(Outlet.T, Outlet.P, x);
466
467"Molar Volume"
468        vm = PP.LiquidVolume(Outlet.T, Outlet.P, x);
469
470        case "Vapour-Only":
471
472"Vapor Fraction"
473        Outlet.v = 1;
474
475"Liquid Composition"
476        x = Outlet.z;
477
478"Vapour Composition"
479        y = Outlet.z;
480
481"Overall Enthalpy"
482        Outlet.h = PP.VapourEnthalpy(Outlet.T, Outlet.P, y);
483
484"Molar Volume"
485        vm = PP.VapourVolume(Outlet.T, Outlet.P, y);
486
487
488        case "Vapour-Liquid":
489
490"Flash Calculation"
491        [Outlet.v, x, y] = PP.Flash(Outlet.T, Outlet.P, Outlet.z);
492
493"Overall Enthalpy"
494        Outlet.h = (1-Outlet.v)*PP.LiquidEnthalpy(Outlet.T, Outlet.P, x) + Outlet.v*PP.VapourEnthalpy(Outlet.T, Outlet.P, y);
495
496"Molar Volume"
497        vm = (1-Outlet.v)*PP.LiquidVolume(Outlet.T, Outlet.P, x) + Outlet.v*PP.VapourVolume(Outlet.T,Outlet.P,y);
498
499end
500
501"Sum of Composition"
502        SumOfComposition = sum(Composition);
503
504"Molar Density"
505        rhom * vm = 1;
506
507"Average Molecular Weight"
508        Mw = sum(M*Outlet.z);
509
510"Mass or Molar Density"
511        rhom * Mw = rho;
512
513"Flow Mass"
514        Fw      =  Mw*Outlet.F;
515
516"Volumetric Flow"
517        Fvol = Outlet.F*vm ;
518       
519"Temperature in °C"
520        T_Cdeg = Outlet.T - 273.15 * 'K';
521
522"Equate Flow"
523        Outlet.F = F;
524
525"Equate Pressures"
526        Outlet.P = P;
527
528"Equate Temperatures"
529        Outlet.T = T;
530
531end
532
533Model simple_source
534
535ATTRIBUTES
536        Pallete = true;
537        Icon = "icon/Source";
538        Brief = "Simple Material stream source";
539        Info = "
540        This model should be used for boundary streams.
541        Usually these streams are known and come from another process
542        units.
543
544        The user should specify:
545         * Total molar flow
546         * Temperature
547         * Pressure
548         * Molar composition
549";
550
551PARAMETERS
552        outer PP                                                as Plugin                       (Brief = "External Physical Properties", Type="PP");
553        outer NComp                             as Integer                      (Brief = "Number of chemical components", Lower = 1);
554                  M(NComp)                              as molweight    (Brief = "Component Mol Weight");
555                  ValidPhases                           as Switcher             (Brief = "Valid Phases for Flash Calculation", Valid = ["Vapour-Only", "Liquid-Only","Vapour-Liquid"], Default="Vapour-Liquid");
556       
557
558SET
559
560        M   = PP.MolecularWeight();
561
562VARIABLES
563
564        out Outlet                      as stream                       (Brief = "Outlet stream", PosX=1, PosY=0.5256, Symbol="_{out}",Protected=true);
565       
566        MolarComposition(NComp) as fraction                     (Brief = "Stream Molar Composition");
567        SumOfComposition as positive                    (Brief = "Sum of Stream Composition",Protected=true);
568        F                                                               as flow_mol             (Brief = "Stream Molar Flow Rate");
569        T                                                               as temperature  (Brief = "Stream Temperature");
570        T_Cdeg                                          as temperature  (Brief = "Temperature in °C", Lower=-200);
571        P                                                               as pressure             (Brief = "Stream Pressure");
572       
573        x(NComp)                        as fraction                     (Brief = "Liquid Molar Fraction",Hidden=true);
574        y(NComp)                        as fraction                     (Brief = "Vapour Molar Fraction",Hidden=true);
575       
576
577EQUATIONS
578
579"Sum of Composition"
580        SumOfComposition = sum(MolarComposition);
581       
582"Stream Molar Composition"
583        Outlet.z = MolarComposition/sum(MolarComposition);
584
585
586switch ValidPhases
587       
588        case "Liquid-Only":
589
590"Vapour Fraction"
591        Outlet.v = 0;
592
593"Liquid Composition"
594        x = Outlet.z;
595
596"Vapour Composition"
597        y = Outlet.z;
598
599"Overall Enthalpy"
600        Outlet.h = PP.LiquidEnthalpy(Outlet.T, Outlet.P, x);
601
602
603        case "Vapour-Only":
604
605"Vapor Fraction"
606        Outlet.v = 1;
607
608"Liquid Composition"
609        x = Outlet.z;
610
611"Vapour Composition"
612        y = Outlet.z;
613
614"Overall Enthalpy"
615        Outlet.h = PP.VapourEnthalpy(Outlet.T, Outlet.P, y);
616
617
618        case "Vapour-Liquid":
619
620"Flash Calculation"
621        [Outlet.v, x, y] = PP.Flash(Outlet.T, Outlet.P, Outlet.z);
622
623"Overall Enthalpy"
624        Outlet.h = (1-Outlet.v)*PP.LiquidEnthalpy(Outlet.T, Outlet.P, x) + Outlet.v*PP.VapourEnthalpy(Outlet.T, Outlet.P, y);
625
626
627end
628
629"Temperature in °C"
630        T_Cdeg = Outlet.T - 273.15 * 'K';
631
632"Equate Flow"
633        Outlet.F = F;
634
635"Equate Pressures"
636        Outlet.P = P;
637
638"Equate Temperatures"
639        Outlet.T = T;
640
641end
642
643Model sourceNoFlow
644
645ATTRIBUTES
646        Pallete = true;
647        Icon = "icon/SourceNoFlow";
648        Brief = "Simple Material stream source with no flow.";
649        Info = "
650        This model should be used for boundary streams.
651        Usually these streams are known and come from another process
652        units.";
653
654PARAMETERS
655        outer PP                                as Plugin                       (Brief = "External Physical Properties", Type="PP");
656        outer NComp             as Integer                      (Brief = "Number of chemical components", Lower = 1);
657
658VARIABLES
659
660        out Outlet                      as stream                       (Brief = "Outlet stream", PosX=1, PosY=0.5256, Symbol="_{out}",Protected=true);
661
662EQUATIONS
663
664"Stream Molar Composition"
665        Outlet.z = 1/NComp;
666
667"Stream Molar Enthalpy"
668        Outlet.h = 0 * 'J/mol';
669
670"Stream Temperature"
671        Outlet.T = 300 * 'K';
672
673"Stream Molar Flow"
674        Outlet.F = 0 * 'kmol/h';
675
676"Stream Pressure"
677        Outlet.P = 1 * 'atm';
678
679"Stream Vapour Fraction"
680        Outlet.v = 0;
681
682end
683
684Model sinkNoFlow
685        ATTRIBUTES
686        Pallete = true;
687        Icon = "icon/SinkNoFlow";
688        Brief = "Simple material stream sink";
689        Info = "
690        This model should be used for seal an outlet material stream port.
691        ";
692       
693        VARIABLES
694        in Inlet                as stream       (Brief = "Inlet Stream", PosX=0, PosY=0.5308, Protected=true,Symbol="_{in}");
695
696EQUATIONS
697"Stream Molar Flow"
698        Inlet.F = 0 * 'kmol/h';
699       
700end
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