source: branches/gui/eml/stage_separators/condenser.mso @ 970

Last change on this file since 970 was 930, checked in by Rafael de Pelegrini Soares, 12 years ago

Added a condenser model with a built-in "reflux" variable.

File size: 21.9 KB
RevLine 
[881]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* Author: Paula B. Staudt
17* $Id: condenser.mso 555 2008-07-18 19:01:13Z rafael $
18*--------------------------------------------------------------------*#
19
20using "tank";
21
22Model condenserSteady
23
24ATTRIBUTES
25        Pallete         = true;
26        Icon            = "icon/CondenserSteady";
27        Brief           = "Model of a  Steady State condenser with no thermodynamics equilibrium.";
28        Info            =
29"== ASSUMPTIONS ==
30* perfect mixing of both phases;
31* no thermodynamics equilibrium.
32
33== SET ==
34* the pressure drop in the condenser;
35
36== SPECIFY ==
37* the InletVapour stream;
38* the InletQ (the model requires an energy stream, also you can use a controller for setting the heat duty using the heat_flow model).
39
40== OPTIONAL ==
41* the condenser model has two control ports
42** TI OutletLiquid Temperature Indicator;
43** PI OutletLiquid Pressure Indicator;
44";
45
46PARAMETERS
47        outer PP        as Plugin       (Brief = "External Physical Properties", Type="PP");
48        outer NComp as Integer  (Brief = "Number of Components");
49
50        Pdrop   as press_delta  (Brief="Pressure Drop in the condenser",Default=0, Symbol="\Delta _P");
51
52VARIABLES
53        in      InletVapour     as stream                       (Brief="Vapour inlet stream", PosX=0.16, PosY=0, Symbol="_{in}^{Vapour}");
54        out     OutletLiquid    as liquid_stream        (Brief="Liquid outlet stream", PosX=0.53, PosY=1, Symbol="_{out}^{Liquid}");
55        in      InletQ                  as power                        (Brief="Heat Duty", PosX=1, PosY=0.08, Symbol="Q_{in}",Protected=true);
56
57        Tbubble as temperature  (Brief ="Bubble Temperature",Protected=true, Symbol ="T_{bubble}");
58        Deg_Subcooled   as temp_delta   (Brief ="Degrees subcooled",Symbol ="\Delta T_{subcooled}");
59
60        out     TI as control_signal    (Brief="Temperature  Indicator of Condenser", Protected = true, PosX=0.50, PosY=0);
61        out     PI as control_signal    (Brief="Pressure  Indicator of Condenser", Protected = true, PosX=0.32, PosY=0);
62
63EQUATIONS
64
65"Molar Flow Balance"
66        InletVapour.F = OutletLiquid.F;
67
68"Molar Composition Balance"
69        InletVapour.z = OutletLiquid.z;
70
71"Energy Balance"
72        InletVapour.F*InletVapour.h  + InletQ = OutletLiquid.F*OutletLiquid.h;
73
74"Pressure Drop"
75        OutletLiquid.P = InletVapour.P - Pdrop;
76
77"Bubble Temperature"
78        Tbubble = PP.BubbleT(OutletLiquid.P,OutletLiquid.z);
79
80"Temperature"
81        OutletLiquid.T = Tbubble-Deg_Subcooled;
82
83"Temperature indicator"
84        TI * 'K' = OutletLiquid.T;
85
86"Pressure indicator"
87        PI * 'atm' = OutletLiquid.P;
88
89end
90
91Model condenserSteady_fakeH
92
93ATTRIBUTES
94        Pallete         = true;
95        Icon            = "icon/CondenserSteady";
96        Brief           = "Model of a  Steady State condenser with fake calculation of outlet conditions.";
97        Info            =
98"Model of a  Steady State condenser with fake calculation of output temperature, but with a real
99calculation of the output stream enthalpy.
100
101== ASSUMPTIONS ==
102* perfect mixing of both phases;
103* no thermodynamics equilibrium.
104
105== SET ==
106* the fake Outlet temperature ;
107* the pressure drop in the condenser;
108
109== SPECIFY ==
110* the InletVapour stream;
111* the InletQ (the model requires an energy stream, also you can use a controller for setting the heat duty using the heat_flow model).
112
113== OPTIONAL ==
114* the condenser model has two control ports
115** TI OutletLiquid Temperature Indicator;
116** PI OutletLiquid Pressure Indicator;
117";
118
119PARAMETERS
120        outer PP        as Plugin       (Brief = "External Physical Properties", Type="PP");
121        outer NComp as Integer  (Brief = "Number of Components");
122
123        Pdrop   as press_delta  (Brief="Pressure Drop in the condenser",Default=0, Symbol="\Delta _P");
124        Fake_Temperature                as temperature  (Brief="Fake temperature", Symbol = "T_{fake}");
125
126
127VARIABLES
128        in      InletVapour     as stream       (Brief="Vapour inlet stream", PosX=0.16, PosY=0, Symbol="_{in}^{Vapour}");
129        out     OutletLiquid    as stream       (Brief="Liquid outlet stream", PosX=0.53, PosY=1, Symbol="_{out}^{Liquid}");
130        in      InletQ                  as power        (Brief="Heat Duty", PosX=1, PosY=0.08, Symbol="Q_{in}",Protected=true);
131
132        out     TI as control_signal    (Brief="Temperature  Indicator of Condenser", Protected = true, PosX=0.50, PosY=0);
133        out     PI as control_signal    (Brief="Pressure  Indicator of Condenser", Protected = true, PosX=0.32, PosY=0);
134
135EQUATIONS
136
137"Molar Flow Balance"
138        InletVapour.F = OutletLiquid.F;
139
140"Molar Composition Balance"
141        InletVapour.z = OutletLiquid.z;
142
143"Energy Balance"
144        InletVapour.F*InletVapour.h  + InletQ = OutletLiquid.F*OutletLiquid.h;
145
146"Pressure Drop"
147        OutletLiquid.P = InletVapour.P - Pdrop;
148
149"Fake Temperature"
150        OutletLiquid.T = Fake_Temperature;
151
152"Vapourisation Fraction"
153        OutletLiquid.v = 0;
154       
155"Temperature indicator"
156        TI * 'K' = OutletLiquid.T;
157
158"Pressure indicator"
159        PI * 'atm' = OutletLiquid.P;
160
161end
162
163Model condenserReact
164        ATTRIBUTES
165        Pallete         = false;
166        Icon            = "icon/Condenser";
167        Brief           = "Model of a Condenser with reaction in liquid phase.";
168        Info            =
169"== Assumptions ==
170* perfect mixing of both phases;
171* thermodynamics equilibrium;
172* the reaction only takes place in liquid phase.
173       
174== Specify ==
175* the reaction related variables;
176* the inlet stream;
177* the outlet flows: OutletVapour.F and OutletLiquid.F;
178* the heat supply.
179
180== Initial Conditions ==
181* the condenser temperature (OutletLiquid.T);
182* the condenser liquid level (Level);
183* (NoComps - 1) OutletLiquid (OR OutletVapour) compositions.
184";
185       
186PARAMETERS
187        outer PP        as Plugin(Type="PP");
188        outer NComp as Integer;
189       
190        V               as volume (Brief="Condenser total volume");
191        Across  as area         (Brief="Cross Section Area of reboiler");
192
193        stoic(NComp)    as Real                 (Brief="Stoichiometric matrix");
194        Hr                              as energy_mol;
195        Initial_Level                           as length                       (Brief="Initial Level of liquid phase");
196        Initial_Temperature                     as temperature          (Brief="Initial Temperature of Condenser");
197        Initial_Composition(NComp)      as fraction             (Brief="Initial Liquid Composition");
198       
199VARIABLES
200
201in      InletVapour             as stream                       (Brief="Vapour inlet stream", PosX=0.1164, PosY=0, Symbol="_{inV}");
202out     OutletLiquid    as liquid_stream        (Brief="Liquid outlet stream", PosX=0.4513, PosY=1, Symbol="_{outL}");
203out     OutletVapour    as vapour_stream        (Brief="Vapour outlet stream", PosX=0.4723, PosY=0, Symbol="_{outV}");
204        InletQ          as power                        (Brief="Cold supplied", PosX=1, PosY=0.6311, Symbol="_{in}");
205
206        M(NComp)        as mol                  (Brief="Molar Holdup in the tray");
207        ML                      as mol                  (Brief="Molar liquid holdup");
208        MV                      as mol                  (Brief="Molar vapour holdup");
209        E                       as energy               (Brief="Total Energy Holdup on tray");
210        vL                      as volume_mol   (Brief="Liquid Molar Volume");
211        vV                      as volume_mol   (Brief="Vapour Molar volume");
212        Level           as length               (Brief="Level of liquid phase");
213        Vol             as volume;
214        r3                      as reaction_mol (Brief="Reaction Rates", DisplayUnit = 'mol/l/s');
215        C(NComp)        as conc_mol     (Brief="Molar concentration", Lower = -1);
216
217INITIAL
218
219        Level                                   = Initial_Level;
220        OutletLiquid.T                          = Initial_Temperature;
221        OutletLiquid.z(1:NComp-1)       = Initial_Composition(1:NComp-1)/sum(Initial_Composition);
222
223EQUATIONS
224"Molar Concentration"
225        OutletLiquid.z = vL * C;
226       
227"Reaction"
228        r3 = exp(-7150*'K'/OutletLiquid.T)*(4.85e4*C(1)*C(2) - 1.23e4*C(3)*C(4)) * 'l/mol/s';
229       
230"Component Molar Balance"
231        diff(M) = InletVapour.F*InletVapour.z - OutletLiquid.F*OutletLiquid.z - OutletVapour.F*OutletVapour.z + stoic*r3*ML*vL;
232
233"Energy Balance"
234        diff(E) = InletVapour.F*InletVapour.h - OutletLiquid.F*OutletLiquid.h- OutletVapour.F*OutletVapour.h + InletQ + Hr * r3 * ML*vL;
235
236"Molar Holdup"
237        M = ML*OutletLiquid.z + MV*OutletVapour.z;
238       
239"Energy Holdup"
240        E = ML*OutletLiquid.h + MV*OutletVapour.h - OutletVapour.P*V;
241       
242"Mol fraction normalisation"
243        sum(OutletLiquid.z)=1.0;
244
245"Liquid Volume"
246        vL = PP.LiquidVolume(OutletLiquid.T, OutletLiquid.P, OutletLiquid.z);
247
248"Vapour Volume"
249        vV = PP.VapourVolume(OutletVapour.T, OutletVapour.P, OutletVapour.z);
250
251"Thermal Equilibrium"
252        OutletLiquid.T = OutletVapour.T;
253
254"Mechanical Equilibrium"
255        OutletVapour.P = OutletLiquid.P;
256
257"Geometry Constraint"
258        V = ML*vL + MV*vV;
259
260        Vol = ML*vL;
261       
262"Level of liquid phase"
263        Level = ML*vL/Across;
264       
265"Chemical Equilibrium"
266        PP.LiquidFugacityCoefficient(OutletLiquid.T, OutletLiquid.P, OutletLiquid.z)*OutletLiquid.z =
267        PP.VapourFugacityCoefficient(OutletVapour.T, OutletVapour.P, OutletVapour.z)*OutletVapour.z;
268
269        sum(OutletLiquid.z)=sum(OutletVapour.z);
270
271end
272
273Model condenser
274
275ATTRIBUTES
276        Pallete         = true;
277        Icon            = "icon/Condenser";
278        Brief           = "Model of a  dynamic condenser with control.";
279        Info            =
280"== ASSUMPTIONS ==
281* perfect mixing of both phases;
282* thermodynamics equilibrium.
283       
284== SPECIFY ==
285* the InletVapour stream;
286* the outlet flows: OutletVapour.F and OutletLiquid.F;
287* the InletQ (the model requires an energy stream, also you can use a controller for setting the heat duty using the heat_flow model).
288
289== OPTIONAL ==
290* the condenser model has three control ports
291** TI OutletLiquid Temperature Indicator;
292** PI OutletLiquid Pressure Indicator;
293** LI Level Indicator of Condenser;
294
295== INITIAL CONDITIONS ==
296* Initial_Temperature :  the condenser temperature (OutletLiquid.T);
297* Levelpercent_Initial : the condenser liquid level in percent (LI);
298* Initial_Composition : (NoComps) OutletLiquid compositions.
299";     
300       
301PARAMETERS
302        outer PP                as Plugin       (Brief = "External Physical Properties", Type="PP");
303        outer NComp     as Integer (Brief="Number of Components");
304       
305        Mw(NComp)       as molweight    (Brief = "Component Mol Weight",Hidden=true);
306        low_flow        as flow_mol     (Brief = "Low Flow",Default = 1E-6, Hidden=true);
307        zero_flow       as flow_mol     (Brief = "No Flow",Default = 0, Hidden=true);
308       
309        VapourFlow      as Switcher     (Brief="Vapour Flow", Valid = ["on", "off"], Default = "on",Hidden=true);
310
311        Kfactor as positive (Brief="K factor for pressure drop", Lower = 1E-8, Default = 1E-3);
312       
313        Levelpercent_Initial            as positive     (Brief="Initial liquid height in Percent", Default = 0.70);
314        Initial_Temperature                     as temperature  (Brief="Initial Temperature of Condenser");
315        Initial_Composition(NComp)      as positive     (Brief="Initial Liquid Composition", Lower=1E-6);
316       
317VARIABLES
318
319        Geometry                as VesselVolume (Brief="Vessel Geometry", Symbol=" ");
320
321in      InletVapour     as stream                       (Brief="Vapour inlet stream", PosX=0.13, PosY=0, Symbol="_{in}^{Vapour}");
322out     OutletLiquid    as liquid_stream        (Brief="Liquid outlet stream", PosX=0.35, PosY=1, Symbol="_{out}^{Liquid}");
323out     OutletVapour    as vapour_stream        (Brief="Vapour outlet stream", PosX=0.54, PosY=0, Symbol="_{out}^{Vapour}");
324in      InletQ                  as power                        (Brief="Heat supplied", Protected = true, PosX=1, PosY=0.08, Symbol="Q_{in}");
325
326        out     TI as control_signal    (Brief="Temperature  Indicator of Condenser", Protected = true, PosX=0.33, PosY=0);
327        out     LI as control_signal    (Brief="Level  Indicator of Condenser", Protected = true, PosX=0.43, PosY=0);
328        out     PI as control_signal    (Brief="Pressure  Indicator of Condenser", Protected = true, PosX=0.25, PosY=0);
329
330        M(NComp)        as mol                  (Brief="Molar Holdup in the tray", Protected = true);
331        ML                      as mol                  (Brief="Molar liquid holdup", Protected = true);
332        MV                      as mol                  (Brief="Molar vapour holdup", Protected = true);
333        E                       as energy               (Brief="Total Energy Holdup on tray", Protected = true);
334        vL                      as volume_mol   (Brief="Liquid Molar Volume", Protected = true);
335        vV                      as volume_mol   (Brief="Vapour Molar volume", Protected = true);
336        rho                     as dens_mass    (Brief ="Inlet Vapour Mass Density",Hidden=true, Symbol ="\rho");
337        Pdrop           as press_delta  (Brief = "Pressure Drop", DisplayUnit = 'kPa', Symbol ="\Delta P", Protected=true);
338
339SET
340        Mw   = PP.MolecularWeight();
341        low_flow = 1E-6 * 'kmol/h';
342        zero_flow = 0 * 'kmol/h';
343       
344INITIAL
345
346"Initial level Percent"
347        LI = Levelpercent_Initial;
348
349"Initial Temperature"
350        OutletLiquid.T  = Initial_Temperature;
351
352"Initial Composition"
353        OutletLiquid.z(1:NComp-1) = Initial_Composition(1:NComp-1)/sum(Initial_Composition);
354
355EQUATIONS
356
357switch VapourFlow
358
359case "on":
[929]360        InletVapour.F*vV = Kfactor *sqrt(Pdrop/rho)*'m^2';
[881]361
362        when InletVapour.F < low_flow switchto "off";
363
364case "off":
365        InletVapour.F = zero_flow;
366
367        when InletVapour.P > OutletLiquid.P switchto "on";
368
369end
370
371"Component Molar Balance"
372        diff(M) = InletVapour.F*InletVapour.z - OutletLiquid.F*OutletLiquid.z- OutletVapour.F*OutletVapour.z;
373
374"Energy Balance"
375        diff(E) = InletVapour.F*InletVapour.h - OutletLiquid.F*OutletLiquid.h- OutletVapour.F*OutletVapour.h + InletQ;
376
377"Molar Holdup"
378        M = ML*OutletLiquid.z + MV*OutletVapour.z;
379       
380"Energy Holdup"
381        E = ML*OutletLiquid.h + MV*OutletVapour.h - OutletVapour.P*Geometry.Vtotal;
382       
383"Mol fraction normalisation"
384        sum(OutletLiquid.z)=1.0;
385
386"Mol fraction Constraint"
387        sum(OutletLiquid.z)=sum(OutletVapour.z);
388
389"Liquid Volume"
390        vL = PP.LiquidVolume(OutletLiquid.T, OutletLiquid.P, OutletLiquid.z);
391       
392"Vapour Volume"
393        vV = PP.VapourVolume(OutletVapour.T, OutletVapour.P, OutletVapour.z);
394
395"Inlet Vapour Density"
396        rho = PP.VapourDensity(InletVapour.T, InletVapour.P, InletVapour.z);
397       
398"Chemical Equilibrium"
399        PP.LiquidFugacityCoefficient(OutletLiquid.T, OutletLiquid.P, OutletLiquid.z)*OutletLiquid.z =
400                PP.VapourFugacityCoefficient(OutletVapour.T, OutletVapour.P, OutletVapour.z)*OutletVapour.z;
401
402"Thermal Equilibrium"
403        OutletLiquid.T = OutletVapour.T;
404
405"Mechanical Equilibrium"
406        OutletVapour.P = OutletLiquid.P;
407
408"Pressure Drop"
409        OutletLiquid.P  = InletVapour.P - Pdrop;
410
411"Geometry Constraint"
412        Geometry.Vtotal = ML*vL + MV*vV;
413
414"Liquid Level"
415        ML * vL = Geometry.Vfilled;
416
417"Temperature indicator"
418        TI * 'K' = OutletLiquid.T;
419
420"Pressure indicator"
421        PI * 'atm' = OutletLiquid.P;
422
423"Level indicator"
424        LI*Geometry.Vtotal= Geometry.Vfilled;
425       
426end
427
428
[930]429Model condenser2
430
431ATTRIBUTES
432        Pallete         = true;
433        Icon            = "icon/Condenser";
434        Brief           = "Model of a  dynamic condenser with control.";
435        Info            =
436"== ASSUMPTIONS ==
437* perfect mixing of both phases;
438* thermodynamics equilibrium.
439       
440== SPECIFY ==
441* the InletVapour stream;
442* the outlet flows: Product.F and Reflux.F;
443* the InletQ (the model requires an energy stream, also you can use a controller for setting the heat duty using the heat_flow model).
444
445== OPTIONAL ==
446* the condenser model has three control ports
447** TI OutletLiquid Temperature Indicator;
448** PI OutletLiquid Pressure Indicator;
449** LI Level Indicator of Condenser;
450
451== INITIAL CONDITIONS ==
452* Initial_Temperature :  the condenser temperature (OutletLiquid.T);
453* Levelpercent_Initial : the condenser liquid level in percent (LI);
454* Initial_Composition : (NoComps) OutletLiquid compositions.
455";     
456       
457PARAMETERS
458        outer PP                as Plugin       (Brief = "External Physical Properties", Type="PP");
459        outer NComp     as Integer (Brief="Number of Components");
460       
461        Mw(NComp)       as molweight    (Brief = "Component Mol Weight",Hidden=true);
462        low_flow        as flow_mol     (Brief = "Low Flow",Default = 1E-6, Hidden=true);
463        zero_flow       as flow_mol     (Brief = "No Flow",Default = 0, Hidden=true);
464
465        CondenserType   as Switcher     (Brief="Condenser type", Valid = ["partial", "total"], Default = "partial");
466        VapourFlow              as Switcher     (Brief="Vapour Flow", Valid = ["on", "off"], Default = "on",Hidden=true);
467
468        Kfactor as positive (Brief="K factor for pressure drop", Lower = 1E-8, Default = 1E-3);
469       
470        Levelpercent_Initial            as positive     (Brief="Initial liquid height in Percent", Default = 0.70);
471        Initial_Temperature                     as temperature  (Brief="Initial Temperature of Condenser");
472        Initial_Composition(NComp)      as positive     (Brief="Initial Liquid Composition", Lower=1E-6);
473       
474VARIABLES
475
476        Geometry                as VesselVolume (Brief="Vessel Geometry", Symbol=" ");
477
478in      InletVapour     as stream                       (Brief="Vapour inlet stream", PosX=0.13, PosY=0, Symbol="_{in}^{Vapour}");
479out     OutletLiquid    as liquid_stream        (Brief="Liquid outlet stream", PosX=0.35, PosY=1, Symbol="_{out}^{Liquid}");
480        Vapour                  as vapour_stream        (Brief="Vapour outlet stream", Hidden=true, Symbol="_{out}^{Vapour}");
481out     Product                 as stream                       (Brief="Vapour or Liquid product stream", PosX=0.54, PosY=0, Symbol="_{out}^{Vapour}");
482in      InletQ                  as power                        (Brief="Heat supplied", Protected = true, PosX=1, PosY=0.08, Symbol="Q_{in}");
483
484        RefluxRatio             as positive     (Brief = "Reflux Ratio", Default=10, Lower = 0.05);
485
486        out     TI as control_signal    (Brief="Temperature  Indicator of Condenser", Protected = true, PosX=0.33, PosY=0);
487        out     LI as control_signal    (Brief="Level  Indicator of Condenser", Protected = true, PosX=0.43, PosY=0);
488        out     PI as control_signal    (Brief="Pressure  Indicator of Condenser", Protected = true, PosX=0.25, PosY=0);
489
490        M(NComp)        as mol                  (Brief="Molar Holdup in the tray", Protected = true);
491        ML                      as mol                  (Brief="Molar liquid holdup", Protected = true);
492        MV                      as mol                  (Brief="Molar vapour holdup", Protected = true);
493        E                       as energy               (Brief="Total Energy Holdup on tray", Protected = true);
494        vL                      as volume_mol   (Brief="Liquid Molar Volume", Protected = true);
495        vV                      as volume_mol   (Brief="Vapour Molar volume", Protected = true);
496        rho                     as dens_mass    (Brief ="Inlet Vapour Mass Density",Hidden=true, Symbol ="\rho");
497        Pdrop           as press_delta  (Brief = "Pressure Drop", DisplayUnit = 'kPa', Symbol ="\Delta P", Protected=true);
498
499SET
500        Mw   = PP.MolecularWeight();
501        low_flow = 1E-6 * 'kmol/h';
502        zero_flow = 0 * 'kmol/h';
503       
504INITIAL
505
506"Initial level Percent"
507        LI = Levelpercent_Initial;
508
509"Initial Temperature"
510        OutletLiquid.T  = Initial_Temperature;
511
512"Initial Composition"
513        OutletLiquid.z(1:NComp-1) = Initial_Composition(1:NComp-1)/sum(Initial_Composition);
514
515EQUATIONS
516
517       
518        Vapour.F = zero_flow;
519        "Reflux ratio"
520        RefluxRatio*Product.F = OutletLiquid.F;
521
522switch CondenserType
523
524case "partial":
525        Product.v = Vapour.v;
526        Product.h = Vapour.h;
527        Product.z = Vapour.z;
528       
529case "total":
530        Product.v = OutletLiquid.v;
531        Product.h = OutletLiquid.h;
532        Product.z = OutletLiquid.z;
533end
534
535
536switch VapourFlow
537
538case "on":
539        InletVapour.F*vV = Kfactor *sqrt(Pdrop/rho)*'m^2';
540
541        when InletVapour.F < low_flow switchto "off";
542
543case "off":
544        InletVapour.F = zero_flow;
545
546        when InletVapour.P > OutletLiquid.P switchto "on";
547
548end
549
550"Component Molar Balance"
551        diff(M) = InletVapour.F*InletVapour.z - OutletLiquid.F*OutletLiquid.z- Product.F*Product.z;
552
553"Energy Balance"
554        diff(E) = InletVapour.F*InletVapour.h - OutletLiquid.F*OutletLiquid.h- Product.F*Product.h + InletQ;
555
556"Molar Holdup"
557        M = ML*OutletLiquid.z + MV*Vapour.z;
558       
559"Energy Holdup"
560        E = ML*OutletLiquid.h + MV*Vapour.h - Vapour.P*Geometry.Vtotal;
561       
562"Mol fraction normalisation"
563        sum(OutletLiquid.z)=1.0;
564
565"Mol fraction Constraint"
566        sum(OutletLiquid.z)=sum(Vapour.z);
567
568"Liquid Volume"
569        vL = PP.LiquidVolume(OutletLiquid.T, OutletLiquid.P, OutletLiquid.z);
570       
571"Vapour Volume"
572        vV = PP.VapourVolume(Vapour.T, Vapour.P, Vapour.z);
573
574"Inlet Vapour Density"
575        rho = PP.VapourDensity(InletVapour.T, InletVapour.P, InletVapour.z);
576       
577"Chemical Equilibrium"
578        PP.LiquidFugacityCoefficient(OutletLiquid.T, OutletLiquid.P, OutletLiquid.z)*OutletLiquid.z =
579                PP.VapourFugacityCoefficient(Vapour.T, Vapour.P, Vapour.z)*Vapour.z;
580
581"Thermal Equilibrium"
582        OutletLiquid.T = Vapour.T;
583        OutletLiquid.T = Product.T;
584
585"Mechanical Equilibrium"
586        Vapour.P = OutletLiquid.P;
587        Vapour.P = Product.P;
588
589"Pressure Drop"
590        OutletLiquid.P  = InletVapour.P - Pdrop;
591
592"Geometry Constraint"
593        Geometry.Vtotal = ML*vL + MV*vV;
594
595"Liquid Level"
596        ML * vL = Geometry.Vfilled;
597
598"Temperature indicator"
599        TI * 'K' = OutletLiquid.T;
600
601"Pressure indicator"
602        PI * 'atm' = OutletLiquid.P;
603
604"Level indicator"
605        LI*Geometry.Vtotal= Geometry.Vfilled;
606       
607end
608
609
[881]610Model condenserSubcooled
611
612ATTRIBUTES
613        Pallete         = true;
614        Icon            = "icon/CondenserSteady";
[900]615        Brief           = "Model of a  Steady State total condenser with specified outlet temperature conditions.";
[881]616        Info            =
[899]617"A simple model of a Steady State total condenser with specified temperature (or subcooling degree), with a real
[900]618calculation of the output stream enthalpy. The subcooling degree is considered to be the difference between the
619inlet vapour and the outlet liquid temperatures.
[881]620
621== ASSUMPTIONS ==
622* perfect mixing of both phases;
[899]623* saturated vapour at the Inlet;
624* no thermodynamics equilibrium;
625* no pressure drop in the condenser.
[881]626
627== SPECIFY ==
628* the InletVapour stream;
629* the subcooled temperature OR the the degree of subcooling.
630
631";
632
633PARAMETERS
[893]634        outer PP        as Plugin       (Brief = "External Physical Properties", Type="PP");
635        outer NComp as Integer  (Brief = "Number of Components");
636
[899]637#        Pdrop   as press_delta  (Brief="Pressure Drop in the condenser",Default=0, Symbol="\Delta _P");
[893]638        #Fake_Temperature               as temperature  (Brief="Fake temperature", Symbol = "T_{fake}");
639
640
641VARIABLES
642        in      InletVapour     as stream       (Brief="Vapour inlet stream", PosX=0.16, PosY=0, Symbol="_{in}^{Vapour}");
643        out     OutletLiquid    as stream       (Brief="Liquid outlet stream", PosX=0.53, PosY=1, Symbol="_{out}^{Liquid}");
644        #in     InletQ                  as power        (Brief="Heat Duty", PosX=1, PosY=0.08, Symbol="Q_{in}",Protected=true);
645        T_sub                           as temperature (Brief="Condensate temperature (subcooled)", Symbol = "T_{sub}");
[900]646        SubcoolingDegree        as temp_delta (Brief="Subcooling Degree", Symbol = "\Delta T_{sub}");
[893]647        CondenserDuty           as power (Brief="Calculated condenser duty for desired subcooling", Protected = true, Symbol = "Q_{cond}");
648
[899]649        #out     TI as control_signal    (Brief="Temperature  Indicator of Condenser", Protected = true, PosX=0.50, PosY=0);
650        #out     PI as control_signal    (Brief="Pressure  Indicator of Condenser", Protected = true, PosX=0.32, PosY=0);
[893]651
652EQUATIONS
653
654"Molar Flow Balance"
655        InletVapour.F = OutletLiquid.F;
656
657"Molar Composition Balance"
658        InletVapour.z = OutletLiquid.z;
659
660#"Energy Balance"
661        #InletVapour.F*InletVapour.h  + InletQ = OutletLiquid.F*OutletLiquid.h;
662
663"Pressure Drop"
[899]664        OutletLiquid.P = InletVapour.P;
[893]665
666"Subcooled Temperature"
667        OutletLiquid.T = T_sub;
668       
[899]669"Degree of subcooling" 
670        SubcoolingDegree = InletVapour.T - T_sub;
[893]671
672"Liquid enthalpy"
673        OutletLiquid.h = PP.LiquidEnthalpy(OutletLiquid.T, OutletLiquid.P, OutletLiquid.z);
674       
675"Condenser Duty"
676        CondenserDuty = OutletLiquid.F*OutletLiquid.h - InletVapour.F*InletVapour.h;
677       
678"Vapourisation Fraction"
679        OutletLiquid.v = 0;
680
681end
682
Note: See TracBrowser for help on using the repository browser.