-
Notifications
You must be signed in to change notification settings - Fork 164
/
Dissipation.mo
13151 lines (11248 loc) · 617 KB
/
Dissipation.mo
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
within Modelica.Fluid;
package Dissipation
"Functions for convective heat transfer and pressure loss characteristics"
extends Modelica.Icons.BasesPackage;
import PI = Modelica.Constants.pi;
import REC = Modelica.Fluid.Dissipation.Utilities.Records;
import TYP = Modelica.Fluid.Dissipation.Utilities.Types;
package UsersGuide "User's guide"
extends Modelica.Icons.Information;
class GettingStarted "Getting Started"
extends Modelica.Icons.Information;
annotation (Documentation(info="<html>
<p>
The <strong> Fluid.Dissipation </strong> library provides convective heat transfer and pressure loss
(HTPL) correlations for a broad range of energy devices to build up thermohydraulic
energy systems.
</p>
<p>
This section introduces an implementation method for the integration of the provided HTPL
functions by Fluid.Dissipation into own application models. Additionally you can find
ready-to-use application models integrated into Modelica.Fluid as thermohydraulic
framework <a href=\"modelica://Modelica.Fluid.Fittings\"> (see
package Fittings)</a>.<br />
In the following the implementation method is described in 5 steps for a straight pipe as
example. Generally the implementation method can be used for all HTPL correlations
throughout the library in the same manner.
</p>
<h4>Step 1: Use/Create model with missing pressure loss correlation</h4>
<p>
All thermohydraulic systems using pressure loss calculations can be modelled for an <strong>
incompressible case </strong>, where the pressure loss (DP) is calculated in dependence of a
known mass flow rate (m_flow)
</p>
<blockquote><pre>
DP = f(m_flow,...)
</pre></blockquote>
<p>
or a <strong> compressible case </strong> , where the mass flow rate (M_FLOW) is calculated in
dependence of a known pressure loss (dp)
</p>
<blockquote><pre>
M_FLOW = f(dp,...).
</pre></blockquote>
<p>
In both cases one target variable (DP for the compressible or M_FLOW for the
incompressible case) is calculated as a function of the corresponding input variable
(m_flow or dp respectively). Both functions for these cases can be found in the library
for the pressure loss device of interest enlarged with a corresponding underscore
describing its intended use (functionname_MFLOW for compressible or functionname_DP for
incompressible calculation).
</p>
<p>
To create a simplified thermohydraulic model, the pressure loss (dp) and the mass flow
rate (M_FLOW) have to be defined as unknown variables and only a functional correlation
between them is still missing. Here the implementation for the compressible case of a
flow model will be explained as example.
</p>
<blockquote><pre>
model straightPipe
//compressible case M_FLOW = f(dp)
Modelica.SIunits.Pressure dp \"Input pressure loss\";
Modelica.SIunits.MassFlowRate M_FLOW \"Output mass flow rate\";
end straightPipe
equation
end straightPipe
</pre></blockquote>
<h4>Step 2: Choose pressure loss <strong> function </strong> of interest</h4>
<p>
The HTPL correlations are modelled with functions for several devices. The pressure loss
of a straight pipe to be modelled can be found by browsing through the <strong>
Fluid.Dissipation </strong> library and looking up the function of interest, here:
</p>
<blockquote><pre>
Fluid.Dissipation.PressureLoss.StraightPipe.dp_overall_MFLOW
</pre></blockquote>
<p>
This HTPL correlation for the compressible case of a straight pipe have to be dragged and
dropped in the equation section of the <strong> equation layer </strong> of the model in Step 1.
</p>
<blockquote><pre>
model straightPipe
//compressible case M_FLOW = f(dp)
Modelica.SIunits.Pressure dp \"Input pressure loss\";
Modelica.SIunits.MassFlowRate M_FLOW \"Output mass flow rate\";
equation
Fluid.Dissipation.PressureLoss.StraightPipe.dp_overall_<strong>MFLOW</strong>
end straightPipe
</pre></blockquote>
<h4>Step 3: Choose corresponding pressure loss <strong> records </strong>
</h4>
<p>
The chosen function in Step 2 still needs its corresponding input values provided by
records. These input records are split into one for input parameters (e.g., for
geometry) and one for input variables (e.g., for fluid properties). The name of these
input records are identical with the corresponding function but with the extension <strong>
_IN_con </strong> for parameters and <strong> _IN_var </strong> for variables as input. These
corresponding input record for the chosen function have to be dragged and dropped on the
<strong> diagram layer </strong> of the model in Step 1.
</p>
<blockquote><pre>
Input parameter record:
Fluid.Dissipation.PressureLoss.StraightPipe.dp_overall<strong>_IN_con</strong> IN_con
Input variable record:
Fluid.Dissipation.PressureLoss.StraightPipe.dp_overall<strong>_IN_var</strong> IN_var
</pre></blockquote>
<p>
Now the equation layer of the model in Step 1 should look similar to the following
(without comments and annotation):
</p>
<blockquote><pre>
model straightPipe
...
//records
Fluid.Dissipation.PressureLoss.StraightPipe.dp_overall_IN_con <strong>IN_con</strong>;
Fluid.Dissipation.PressureLoss.StraightPipe.dp_overall_IN_var <strong>IN_var</strong>;
equation
Fluid.Dissipation.PressureLoss.StraightPipe.dp_overall_MFLOW
end straightPipe
</pre></blockquote>
<h4>Step 4: Build function-record construction </h4>
<p>
Now the input record have to be assigned to the chosen function in the equation layer.
The resulting function-record implementation for the compressible case looks like the
following:
</p>
<blockquote><pre>
model straightPipe
...
equation
//compressible case
M_FLOW = Fluid.Dissipation.PressureLoss.StraightPipe.dp_overall_MFLOW(IN_con,IN_var,dp);
end straightPipe
</pre></blockquote>
<p>
Here the compressible case for the unknown mass flow rate (M_FLOW) is calculated by the
known pressure difference (dp) out of the interfaces of the thermohydraulic framework and
the input records (IN_con,IN_var) provide data like geometry and fluid properties for
example.
</p>
<h4>Step 5: Assign record variables </h4>
<p>
In the last step the variables of the input records for the function have to be assigned.
The assignment of the record variables can either be done directly in the record on the
diagram layer or in the equation layer.
The assignment of the input record in the equation layer results into the following
model:
</p>
<blockquote><pre>
model straightPipe
...
//compressible fluid flow
//input record
Fluid.Dissipation.Examples.Applications.PressureLoss.BaseClasses.StraightPipe.Overall.Pres
sureLossInput_con
IN_con(
d_hyd=d_hyd,
L=L,
roughness=roughness,
K=K);
Fluid.Dissipation.Examples.Applications.PressureLoss.BaseClasses.StraightPipe.Overall.Pres
sureLossInput_var
IN_var(
eta=eta,
rho=rho);
...
end straight Pipe;
</pre></blockquote>
<p>
If the implementation of a HTPL correlation is done in an existing application model, the
unknown variables out of Step 1 (M_FLOW and dp for compressible or DP and m_flow for
incompressible case) have to be adjusted to the model variables (typically the interface
variables). The implementation of HTPL correlation into <strong> Modelica.Fluid </strong> can be
found for <a href=\"modelica://Modelica.Fluid.Fittings\"> flow
models of several devices</a>.
</p>
</html>"));
end GettingStarted;
class ReleaseNotes "Release notes"
extends Modelica.Icons.ReleaseNotes;
annotation (Documentation(info="<html>
<h4>Version 1.0 Beta 4-6, 2010-01-12</h4>
<p>
Fluid.Dissipation was improved for the release as follows:
</p>
<ul>
<li> Changed structure for input records of all heat transfer and pressure loss
functions:
<ul>
<li> Reduced amount of input records for compressible and incompressible functions as well as for their combinational one to improve usability of library.</li>
<li> Splitting input records of one function into one with parameters (e.g., for geometry) and one with variables (e.g., fluid properties) to ease work of IDE-solver.</li>
</ul>
</li>
<li> Improved Modelica.Fluid application models for available heat transfer and pressure
loss functions:
<ul>
<li> Flattened inheritance with one base flow model for all energy devices.</li>
<li> Implemented smooth state of fluid density and dynamic viscosity for reverse flow.</li>
</ul>
</li>
<li> Adaption of complete library due to structure change.</li>
</ul>
<h4>Version 1.0 Beta 3, 2009-07-03</h4>
<p>
Fluid.Dissipation was improved for the release as follows:
</p>
<ul>
<li> Changed flow models structure:<br>
Now that a future feature for the automatic choice of using either a mass flow rate (compressible case) or a pressure loss (incompressible case) function for calculation is supported if implemented by IDE. Due to that no manual selection of a compressible or incompressible calculation in the Modelica.Fluid flow models is possible anymore. Therefore nonlinear equations will be created from the Modelica.Fluid flow models, if the future feature is not supported and the mass flow rate is known at a fluid port instead of the pressure loss.
</li>
<li> Changed structure and amount of records used as input for function calls due to
changed structure of flow model.
</li>
<li> Changed structure of function calls due to changed structure of flow model.
</li>
<li> Finished validation of all available heat transfer and pressure loss functions.
</li>
<li> Included scripts for verification of all available heat transfer and pressure loss functions.
</li>
</ul>
<h4>Version 1.0 Beta 2, 2009-04-22</h4>
<p>
Fluid.Dissipation was improved for the release as follows:
</p>
<ul>
<li> Support of analytical Jacobians at inverse calculation of heat transfer and pressure loss functions.
</li>
<li> Included Modelica.Fluid application models for available heat transfer and pressure loss functions.
</li>
<li> Adaption of complete library to Modelica Standard nomenclature.</li>
</ul>
<h4>Version 1.0 Beta 1, 2008-10-08</h4>
Initial release of Fluid.Dissipation.
</html>"));
end ReleaseNotes;
class Contact "Contact"
extends Modelica.Icons.Contact;
annotation (Documentation(info="<html>
<h4>Library officer and co-author</h4>
<p>
<strong>Stefan Wischhusen</strong><br>
XRG Simulation GmbH<br>
Hamburg, Germany<br>
email: <a href=\"mailto:wischhusen@xrg-simulation.de\">wischhusen@xrg-simulation.de</a>
</p>
<h4>Acknowledgements</h4>
<p>
The following people contributed to the Modelica.Fluid.Dissipation library (alphabetical list):
Jörg Eiden, Ole Engel, Nina Peci, Sven Rutkowski, Thorben Vahlenkamp, Stefan
Wischhusen.
</p>
<p>
The development of the Modelica.Fluid.Dissipation library was founded within the ITEA research
project EuroSysLib-D by German Federal Ministry of Education and Research (promotional
reference 01IS07022B). The project was started in October 2007 and ended in June 2010.
</p>
</html>"));
end Contact;
annotation (DocumentationClass=true, Documentation(info="<html>
<p>The User's Guide contains the following sub-sections:
</p>
<ul>
<li> <a href=\"modelica://Modelica.Fluid.Dissipation.UsersGuide.GettingStarted\">Getting Started</a></li>
<li> <a href=\"modelica://Modelica.Fluid.Dissipation.UsersGuide.ReleaseNotes\">Release notes</a></li>
<li> <a href=\"modelica://Modelica.Fluid.Dissipation.UsersGuide.Contact\">Contact information</a></li>
</ul>
</html>"));
end UsersGuide;
package HeatTransfer "Package for calculation of heat transfer"
extends Modelica.Icons.VariantsPackage;
package Channel
extends Modelica.Icons.VariantsPackage;
function kc_evenGapLaminar
"Mean heat transfer coefficient of even gap | laminar flow regime | considering boundary layer development | heat transfer at ONE or BOTH sides | identical and constant wall temperatures"
extends Modelica.Icons.Function;
//SOURCE: VDI-Waermeatlas, 9th edition, Springer-Verlag, 2002, Section Gb 6-10
//input records
input
Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapLaminar_IN_con
IN_con "Input record for function kc_evenGapLaminar"
annotation (Dialog(group="Constant inputs"));
input
Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapLaminar_IN_var
IN_var "Input record for function kc_evenGapLaminar"
annotation (Dialog(group="Variable inputs"));
//output variables
output SI.CoefficientOfHeatTransfer kc
"Convective heat transfer coefficient"
annotation (Dialog(group="Output"));
output SI.PrandtlNumber Pr "Prandtl number" annotation (Dialog(group="Output"));
output SI.ReynoldsNumber Re "Reynolds number"
annotation (Dialog(group="Output"));
output SI.NusseltNumber Nu "Nusselt number"
annotation (Dialog(group="Output"));
output Real failureStatus
"0== boundary conditions fulfilled | 1== failure >> check if still meaningful results"
annotation (Dialog(group="Output"));
protected
type TYP = Modelica.Fluid.Dissipation.Utilities.Types.kc_evenGap;
Real MIN=Modelica.Constants.eps;
Real laminar=2200 "Maximum Reynolds number of laminar flow regime";
SI.Area A_cross=IN_con.s*IN_con.h "Cross sectional area of gap";
SI.Diameter d_hyd=2*IN_con.s "Hydraulic diameter";
Real prandtlMax=if IN_con.target == TYP.UndevOne then 10 else if IN_con.target
== TYP.UndevBoth then 1000 else 0 "Maximum Prandtl number";
Real prandtlMin=if IN_con.target == TYP.UndevOne or IN_con.target == TYP.UndevBoth then
0.1 else 0 "Minimum Prandtl number";
SI.Velocity velocity=abs(IN_var.m_flow)/max(MIN, IN_var.rho*A_cross)
"Mean velocity in gap";
//failure status
Real fstatus[2] "Check of expected boundary conditions";
//Documentation
algorithm
Pr := abs(IN_var.eta*IN_var.cp/max(MIN, IN_var.lambda));
Re := max(1, abs(IN_var.rho*velocity*d_hyd/max(MIN, IN_var.eta)));
kc := Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapLaminar_KC(IN_con,
IN_var);
Nu := kc*d_hyd/max(MIN, IN_var.lambda);
//failure status
fstatus[1] := if Re > laminar then 1 else 0;
fstatus[2] := if IN_con.target == TYP.UndevOne or IN_con.target == TYP.UndevBoth then
if Pr > prandtlMax or Pr < prandtlMin then 1 else 0 else 0;
failureStatus := 0;
for i in 1:size(fstatus, 1) loop
if fstatus[i] == 1 then
failureStatus := 1;
end if;
end for;
annotation(Inline=false, Documentation(info="<html>
<p>Calculation of the mean convective heat transfer coefficient <strong>kc </strong>for a laminar fluid flow through an even gap at different fluid flow and heat transfer situations. Note that additionally a failure status is observed in this function to check if the intended boundary conditions are fulfilled.
<a href=\"modelica://Modelica.Fluid.Dissipation.Utilities.SharedDocumentation.HeatTransfer.Channel.kc_evenGapLaminar\">See more information.</a></p>
</html>"), smoothOrder(normallyConstant=IN_con) = 2);
end kc_evenGapLaminar;
function kc_evenGapLaminar_KC
"Mean heat transfer coefficient of even gap | laminar flow regime | considering boundary layer development | heat transfer at ONE or BOTH sides | identical and constant wall temperatures"
extends Modelica.Icons.Function;
//SOURCE: VDI-Waermeatlas, 9th edition, Springer-Verlag, 2002, Section Gb 6-10
//input records
input
Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapLaminar_IN_con
IN_con "Input record for function kc_evenGapLaminar_KC"
annotation (Dialog(group="Constant inputs"));
input
Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapLaminar_IN_var
IN_var "Input record for function kc_evenGapLaminar_KC"
annotation (Dialog(group="Variable inputs"));
//output variables
output SI.CoefficientOfHeatTransfer kc
"Output for function kc_evenGapLaminar_KC";
protected
type TYP = Modelica.Fluid.Dissipation.Utilities.Types.kc_evenGap;
Real MIN=Modelica.Constants.eps;
SI.Area A_cross=max(MIN, IN_con.s*IN_con.h)
"Cross sectional area of gap";
SI.Diameter d_hyd=2*IN_con.s "Hydraulic diameter";
SI.Velocity velocity=abs(IN_var.m_flow)/max(MIN, IN_var.rho*A_cross)
"Mean velocity in gap";
SI.ReynoldsNumber Re=(IN_var.rho*velocity*d_hyd/max(MIN, IN_var.eta));
SI.PrandtlNumber Pr=abs(IN_var.eta*IN_var.cp/max(MIN, IN_var.lambda));
//variables for mean Nusselt number
//SOURCE: p.Gb 7, eq. 36/37
SI.NusseltNumber Nu_1=if IN_con.target == TYP.DevOne or IN_con.target == TYP.UndevOne then
4.861 else if IN_con.target == TYP.DevBoth or IN_con.target == TYP.UndevBoth then
7.541 else 0 "First Nusselt number";
//SOURCE: p.Gb 7, eq. 38
SI.NusseltNumber Nu_2=1.841*(Re*Pr*d_hyd/(max(IN_con.L, MIN)))^(1/3)
"Second Nusselt number";
//SOURCE: p.Gb 7, eq. 42
SI.NusseltNumber Nu_3=if IN_con.target == TYP.UndevOne or IN_con.target ==
TYP.UndevBoth then (2/(1 + 22*Pr))^(1/6)*(Re*Pr*d_hyd/(max(IN_con.L, MIN)))
^(0.5) else 0 "Third mean Nusselt number";
SI.NusseltNumber Nu=((Nu_1)^3 + (Nu_2)^3 + (Nu_3)^3)^(1/3);
//Documentation
algorithm
kc := Nu*((IN_var.lambda/max(MIN, d_hyd)));
annotation(Inline=false, Documentation(info="<html>
<p>
Calculation of the mean convective heat transfer coefficient <strong> kc </strong> for a laminar fluid flow through an even gap at different fluid flow and heat transfer situations.
<a href=\"modelica://Modelica.Fluid.Dissipation.Utilities.SharedDocumentation.HeatTransfer.Channel.kc_evenGapLaminar\">See more information.</a>
</p>
</html>", revisions="<html>
<p>2016-04-11 Stefan Wischhusen: Removed singularity for Re at zero mass flow rate.</p>
</html>"), smoothOrder(normallyConstant=IN_con) = 2);
end kc_evenGapLaminar_KC;
record kc_evenGapLaminar_IN_con
"Input record for function kc_evenGapLaminar and kc_evenGapLaminar_KC"
extends
Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapOverall_IN_con;
annotation (Documentation(info="<html>
<p>
This record is used as <strong> input record </strong> for the heat transfer function <a href=\"modelica://Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapLaminar\"> kc_evenGapLaminar</a> and
<a href=\"modelica://Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapLaminar_KC\"> kc_evenGapLaminar_KC</a>.</p>
</html>"));
end kc_evenGapLaminar_IN_con;
record kc_evenGapLaminar_IN_var
"Input record for function kc_evenGapLaminar and kc_evenGapLaminar_KC"
extends
Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapOverall_IN_var;
annotation (Documentation(info="<html>
<p>
This record is used as <strong> input record </strong> for the heat transfer function <a href=\"Modelica://Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapLaminar\"> kc_evenGapLaminar</a> and
<a href=\"modelica://Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapLaminar_KC\"> kc_evenGapLaminar_KC</a>.</p>
</html>"));
end kc_evenGapLaminar_IN_var;
function kc_evenGapOverall
"Mean heat transfer coefficient of even gap | overall flow regime | considering boundary layer development | heat transfer at ONE or BOTH sides | identical and constant wall temperatures | surface roughness"
extends Modelica.Icons.Function;
//SOURCE: VDI-Waermeatlas, 9th edition, Springer-Verlag, 2002, Section Gb 6-10
import MIN = Modelica.Constants.eps;
// import SMOOTH = Modelica.Fluid.Dissipation.Utilities.Functions.Stepsmoother;
//input records
input
Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapOverall_IN_con
IN_con "Input record for function kc_evenGapOverall"
annotation (Dialog(group="Constant inputs"));
input
Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapOverall_IN_var
IN_var "Input record for function kc_evenGapOverall"
annotation (Dialog(group="Variable inputs"));
//output variables
output SI.CoefficientOfHeatTransfer kc
"Convective heat transfer coefficient"
annotation (Dialog(group="Output"));
output SI.PrandtlNumber Pr "Prandtl number" annotation (Dialog(group="Output"));
output SI.ReynoldsNumber Re "Reynolds number"
annotation (Dialog(group="Output"));
output SI.NusseltNumber Nu "Nusselt number"
annotation (Dialog(group="Output"));
output Real failureStatus
"0== boundary conditions fulfilled | 1== failure >> check if still meaningful results"
annotation (Dialog(group="Output"));
protected
type TYP = Modelica.Fluid.Dissipation.Utilities.Types.kc_evenGap;
Real MIN=Modelica.Constants.eps;
Real laminar=2200 "Maximum Reynolds number for laminar regime";
Real turbulent=1e4 "Minimum Reynolds number for turbulent regime";
SI.Area A_cross=IN_con.s*IN_con.h "Cross sectional area of gap";
SI.Diameter d_hyd=2*IN_con.s "Hydraulic diameter";
Real prandtlMax=if IN_con.target == TYP.UndevOne then 10 else if IN_con.target
== TYP.UndevBoth then 1000 else 0 "Maximum Prandtl number";
Real prandtlMin=if IN_con.target == TYP.UndevOne or IN_con.target == TYP.UndevBoth then
0.1 else 0 "Minimum Prandtl number";
SI.Velocity velocity=abs(IN_var.m_flow)/max(MIN, IN_var.rho*A_cross)
"Mean velocity in gap";
//failure status
Real fstatus[2] "Check of expected boundary conditions";
//Documentation
algorithm
Pr := abs(IN_var.eta*IN_var.cp/max(MIN, IN_var.lambda));
Re := max(1e-3, abs(IN_var.rho*velocity*d_hyd/max(MIN, IN_var.eta)));
kc := Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapOverall_KC(IN_con, IN_var);
Nu := kc*d_hyd/max(MIN, IN_var.lambda);
//failure status
fstatus[1] := if IN_con.target == TYP.UndevOne or IN_con.target == TYP.UndevBoth then
if Pr > prandtlMax or Pr < prandtlMin then 1 else 0 else 0;
fstatus[2] := if d_hyd/IN_con.L > 1.0 then 1 else 0;
failureStatus := 0;
for i in 1:size(fstatus, 1) loop
if fstatus[i] == 1 then
failureStatus := 1;
end if;
end for;
annotation (Inline=false, smoothOrder(normallyConstant=IN_con) = 2,
Documentation(info="<html>
<p>
Calculation of the mean convective heat transfer coefficient <strong> kc </strong> for an overall fluid flow through an even gap at different fluid flow and heat transfer situations. Note that additionally a failure status is observed in this function to check if the intended boundary conditions are fulfilled. <a href=\"modelica://Modelica.Fluid.Dissipation.Utilities.SharedDocumentation.HeatTransfer.Channel.kc_evenGapOverall\">See more information.</a>
</p>
</html>"));
end kc_evenGapOverall;
function kc_evenGapOverall_KC
"Mean heat transfer coefficient of even gap | overall flow regime | considering boundary layer development | heat transfer at ONE or BOTH sides | identical and constant wall temperatures | surface roughness"
extends Modelica.Icons.Function;
//SOURCE: VDI-Waermeatlas, 9th edition, Springer-Verlag, 2002, Section Gb 6-10
import SMOOTH =
Modelica.Fluid.Dissipation.Utilities.Functions.General.Stepsmoother;
//input records
input
Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapOverall_IN_con
IN_con "Input record for function kc_evenGapOverall_KC"
annotation (Dialog(group="Constant inputs"));
input
Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapOverall_IN_var
IN_var "Input record for function kc_evenGapOverall_KC"
annotation (Dialog(group="Variable inputs"));
//output variables
output SI.CoefficientOfHeatTransfer kc
"Output for function kc_evenGapOverall_KC";
protected
Real MIN=Modelica.Constants.eps;
Real laminar=2200 "Maximum Reynolds number for laminar regime";
Real turbulent=1e4 "Minimum Reynolds number for turbulent regime";
SI.Area A_cross=max(MIN, IN_con.s*IN_con.h)
"Cross sectional area of gap";
SI.Diameter d_hyd=2*IN_con.s "Hydraulic diameter";
SI.Velocity velocity=abs(IN_var.m_flow)/max(MIN, IN_var.rho*A_cross)
"Mean velocity in gap";
SI.ReynoldsNumber Re=(IN_var.rho*velocity*d_hyd/max(MIN, IN_var.eta));
SI.PrandtlNumber Pr=abs(IN_var.eta*IN_var.cp/max(MIN, IN_var.lambda));
kc_evenGapTurbulent_IN_con IN_con_turb(h=IN_con.h,s=IN_con.s,L=IN_con.L);
algorithm
kc := SMOOTH(
laminar,
turbulent,
Re)*Dissipation.HeatTransfer.Channel.kc_evenGapLaminar_KC(
IN_con, IN_var) + SMOOTH(
turbulent,
laminar,
Re)*Dissipation.HeatTransfer.Channel.kc_evenGapTurbulent_KC(IN_con_turb,
IN_var);
annotation (Inline=false, Documentation(info="<html>
<p>
Calculation of the mean convective heat transfer coefficient <strong> kc </strong> for an overall fluid flow through an even gap at different fluid flow and heat transfer situations. <a href=\"modelica://Modelica.Fluid.Dissipation.Utilities.SharedDocumentation.HeatTransfer.Channel.kc_evenGapOverall\">See more information.</a>
</p>
</html>", revisions="<html>
<p>2016-04-11 Stefan Wischhusen: Removed singularity for Re at zero mass flow rate.</p>
</html>"), smoothOrder(normallyConstant=IN_con) = 2);
end kc_evenGapOverall_KC;
record kc_evenGapOverall_IN_con
"Input record for function kc_evenGapOverall and kc_evenGapOverall_KC"
//even gap variables
extends
Modelica.Fluid.Dissipation.Utilities.Records.HeatTransfer.EvenGap;
annotation (Documentation(info="<html>
This record is used as <strong> input record </strong> for the heat transfer function <a href=\"modelica://Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapOverall\"> kc_evenGapOverall</a> and
<a href=\"modelica://Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapOverall_KC\"> kc_evenGapOverall_KC</a>.
</html>"));
end kc_evenGapOverall_IN_con;
record kc_evenGapOverall_IN_var
"Input record for function kc_evenGapOverall and kc_evenGapOverall_KC"
//fluid property variables
extends
Modelica.Fluid.Dissipation.Utilities.Records.General.FluidProperties;
//input variable (mass flow rate)
SI.MassFlowRate m_flow annotation (Dialog(group="Input"));
annotation (Documentation(info="<html>
This record is used as <strong> input record </strong> for the heat transfer function <a href=\"Modelica://Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapOverall\"> kc_evenGapOverall</a> and
<a href=\"Modelica://Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapOverall_KC\"> kc_evenGapOverall_KC</a>.
</html>"));
end kc_evenGapOverall_IN_var;
function kc_evenGapTurbulent
"Mean heat transfer coefficient of even gap | turbulent flow regime | developed fluid flow | heat transfer at BOTH sides | identical and constant wall temperatures"
extends Modelica.Icons.Function;
//SOURCE: VDI-Waermeatlas, 9th edition, Springer-Verlag, 2002, Section Gb 7
import MIN = Modelica.Constants.eps;
//input records
input
Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapTurbulent_IN_con
IN_con "Input record for function kc_evenGapTurbulent"
annotation (Dialog(group="Constant inputs"));
input
Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapTurbulent_IN_var
IN_var "Input record for function kc_evenGapTurbulent"
annotation (Dialog(group="Variable inputs"));
//output variables
output SI.CoefficientOfHeatTransfer kc
"Convective heat transfer coefficient"
annotation (Dialog(group="Output"));
output SI.PrandtlNumber Pr "Prandtl number" annotation (Dialog(group="Output"));
output SI.ReynoldsNumber Re "Reynolds number"
annotation (Dialog(group="Output"));
output SI.NusseltNumber Nu "Nusselt number"
annotation (Dialog(group="Output"));
output Real failureStatus
"0== boundary conditions fulfilled | 1== failure >> check if still meaningful results"
annotation (Dialog(group="Output"));
protected
Real MIN=Modelica.Constants.eps;
Real prandtlMax=100 "Maximum Prandtl number";
Real prandtlMin=0.6 "Minimum Prandtl number";
Real turbulentMax=1e6
"Maximum Reynolds number for turbulent flow regime";
Real turbulentMin=3e4
"Minimum Reynolds number for turbulent flow regime";
SI.Area A_cross=max(MIN, IN_con.s*IN_con.h)
"Cross sectional area of gap";
SI.Diameter d_hyd=2*IN_con.s "Hydraulic diameter";
SI.Velocity velocity=abs(IN_var.m_flow)/max(MIN, IN_var.rho*A_cross)
"Mean velocity in gap";
//failure status
Real fstatus[3] "Check of expected boundary conditions";
//Documentation
algorithm
Pr := abs(IN_var.eta*IN_var.cp/max(MIN, IN_var.lambda));
Re := max(1, abs(IN_var.rho*velocity*d_hyd/max(MIN, IN_var.eta)));
kc := Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapTurbulent_KC(IN_con,
IN_var);
Nu := kc*d_hyd/max(MIN, IN_var.lambda);
//failure status
fstatus[1] := if Re > turbulentMax or Re < turbulentMin then 1 else 0;
fstatus[2] := if Pr > prandtlMax or Pr < prandtlMin then 1 else 0;
fstatus[3] := if d_hyd/max(MIN, IN_con.L) > 1.0 then 1 else 0;
failureStatus := 0;
for i in 1:size(fstatus, 1) loop
if fstatus[i] == 1 then
failureStatus := 1;
end if;
end for;
annotation (Inline=false, Documentation(info="<html>
<p>
Calculation of the mean convective heat transfer coefficient <strong> kc </strong> for a developed turbulent fluid flow through an even gap at heat transfer from both sides. Note that additionally a failure status is observed in this function to check if the intended boundary conditions are fulfilled. <a href=\"modelica://Modelica.Fluid.Dissipation.Utilities.SharedDocumentation.HeatTransfer.Channel.kc_evenGapTurbulent\">See more information.</a>
</p>
</html>"), smoothOrder(normallyConstant=IN_con) = 2);
end kc_evenGapTurbulent;
function kc_evenGapTurbulent_KC
"Mean heat transfer coefficient of even gap | turbulent flow regime | developed fluid flow | heat transfer at BOTH sides | identical and constant wall temperatures"
extends Modelica.Icons.Function;
//SOURCE: VDI-Waermeatlas, 9th edition, Springer-Verlag, 2002, Section Gb 7
//input records
input
Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapTurbulent_IN_con
IN_con "Input record for function kc_evenGapTurbulent_KC"
annotation (Dialog(group="Constant inputs"));
input
Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapTurbulent_IN_var
IN_var "Input record for function kc_evenGapTurbulent_KC"
annotation (Dialog(group="Variable inputs"));
//output variables
output SI.CoefficientOfHeatTransfer kc
"Output for function kc_evenGapTurbulent_KC";
protected
Real MIN=Modelica.Constants.eps;
SI.Area A_cross=max(MIN, IN_con.s*IN_con.h)
"Cross sectional area of gap";
SI.Diameter d_hyd=2*IN_con.s "Hydraulic diameter";
SI.Velocity velocity=abs(IN_var.m_flow)/max(MIN, IN_var.rho*A_cross)
"Mean velocity in gap";
SI.ReynoldsNumber Re=max(MIN,(IN_var.rho*velocity*d_hyd/max(MIN, IN_var.eta)));
SI.PrandtlNumber Pr=abs(IN_var.eta*IN_var.cp/max(MIN, IN_var.lambda));
//SOURCE: p.Ga 5, eq. 27
Real zeta=1/max(MIN, 1.8*Modelica.Math.log10(abs(Re)) - 1.5)^2
"Pressure loss coefficient";
//SOURCE: p.Gb 5, eq. 26
//assumption according to Gb 7, sec. 2.4
SI.NusseltNumber Nu=abs((zeta/8)*Re*Pr/(1 + 12.7*(zeta/8)^0.5*(Pr^(2/3) - 1))
*(1 + (d_hyd/max(MIN, IN_con.L))^(2/3)));
//Documentation
algorithm
kc := Nu*(IN_var.lambda/max(MIN, d_hyd));
annotation (Inline=false, Documentation(info="<html>
<p>
Calculation of the mean convective heat transfer coefficient <strong> kc </strong> for a developed turbulent fluid flow through an even gap at heat transfer from both sides. <a href=\"modelica://Modelica.Fluid.Dissipation.Utilities.SharedDocumentation.HeatTransfer.Channel.kc_evenGapTurbulent\">See more information.</a>
</p>
</html>", revisions="<html>
<p>2016-04-12 Stefan Wischhusen: Limited Re to very small value (Modelica.Constant.eps).</p>
</html>"), smoothOrder(normallyConstant=IN_con) = 2);
end kc_evenGapTurbulent_KC;
record kc_evenGapTurbulent_IN_con
"Input record for function kc_evenGapTurbulent and kc_evenGapTurbulent_KC"
extends
Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapOverall_IN_con(
final target=Modelica.Fluid.Dissipation.Utilities.Types.kc_evenGap.DevBoth);
annotation (Documentation(info="<html>
<p>
This record is used as <strong> input record </strong> for the heat transfer function <a href=\"modelica://Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapTurbulent\"> kc_evenGapTurbulent</a> and
<a href=\"Modelica://Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapTurbulent_KC\"> kc_evenGapTurbulent_KC</a>.
</p>
</html>"));
end kc_evenGapTurbulent_IN_con;
record kc_evenGapTurbulent_IN_var
"Input record for function kc_evenGapTurbulent and kc_evenGapTurbulent_KC"
extends
Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapOverall_IN_var;
annotation (Documentation(info="<html>
<p>
This record is used as <strong> input record </strong> for the heat transfer function <a href=\"modelica://Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapTurbulent\"> kc_evenGapTurbulent</a> and
<a href=\"Modelica://Modelica.Fluid.Dissipation.HeatTransfer.Channel.kc_evenGapTurbulent_KC\"> kc_evenGapTurbulent_KC</a>.
</p>
</html>"));
end kc_evenGapTurbulent_IN_var;
annotation (preferredView="info", Documentation(info="<html>
<h4>Even gap</h4>
<h5>Laminar flow</h5>
<p>Calculation of the mean convective heat transfer coefficient <strong>kc </strong>for a laminar fluid flow through an even gap at different fluid flow and heat transfer situations. <a href=\"modelica://Modelica.Fluid.Dissipation.Utilities.SharedDocumentation.HeatTransfer.Channel.kc_evenGapLaminar\">See more information.</a></p>
<h5>Turbulent flow</h5>
<p>Calculation of the mean convective heat transfer coefficient <strong>kc </strong>for a laminar fluid flow through an even gap at different fluid flow and heat transfer situations. <a href=\"modelica://Modelica.Fluid.Dissipation.Utilities.SharedDocumentation.HeatTransfer.Channel.kc_evenGapTurbulent\">See more information.</a></p>
<h5>Overall flow</h5>
<p>Calculation of the mean convective heat transfer coefficient <strong>kc </strong>for a laminar fluid flow through an even gap at different fluid flow and heat transfer situations. <a href=\"modelica://Modelica.Fluid.Dissipation.Utilities.SharedDocumentation.HeatTransfer.Channel.kc_evenGapOverall\">See more information.</a></p>
</html>"));
end Channel;
package General
extends Modelica.Icons.VariantsPackage;
function kc_approxForcedConvection
"Mean convective heat transfer coefficient for forced convection | approximation | turbulent regime | hydrodynamically developed fluid flow"
extends Modelica.Icons.Function;
//SOURCE: A Bejan and A.D. Kraus. Heat Transfer handbook.John Wiley & Sons, 2nd edition, 2003. (p.424 ff)
//Notation of equations according to SOURCE
//input records
input
Modelica.Fluid.Dissipation.HeatTransfer.General.kc_approxForcedConvection_IN_con
IN_con "Input record for function kc_approxForcedConvection"
annotation (Dialog(group="Constant inputs"));
input
Modelica.Fluid.Dissipation.HeatTransfer.General.kc_approxForcedConvection_IN_var
IN_var "Input record for function kc_approxForcedConvection"
annotation (Dialog(group="Variable inputs"));
//output variables
output SI.CoefficientOfHeatTransfer kc
"Convective heat transfer coefficient"
annotation (Dialog(group="Output"));
output SI.PrandtlNumber Pr "Prandtl number" annotation (Dialog(group="Output"));
output SI.ReynoldsNumber Re "Reynolds number"
annotation (Dialog(group="Output"));
output SI.NusseltNumber Nu "Nusselt number"
annotation (Dialog(group="Output"));
output Real failureStatus
"0== boundary conditions fulfilled | 1== failure >> check if still meaningful results"
annotation (Dialog(group="Output"));
protected
type TYP = Modelica.Fluid.Dissipation.Utilities.Types.kc_general;
Real MIN=Modelica.Constants.eps;
Real prandtlMax[3]={120,16700,500} "Maximum Prandtl number";
Real prandtlMin[3]={0.7,0.7,1.5} "Minimum Prandtl number";
Real reynoldsMax[3]={1.24e5,1e6,1e6} "Maximum Reynolds number";
Real reynoldsMin[3]={2500,1e4,3e3} "Minimum Reynolds number";
SI.Diameter d_hyd=max(MIN, 4*IN_con.A_cross/max(MIN, IN_con.perimeter))
"Hydraulic diameter";
//failure status
Real fstatus[2] "Check of expected boundary conditions";
algorithm
Pr := Modelica.Fluid.Dissipation.Utilities.Functions.General.PrandtlNumber(
IN_var.cp,
IN_var.eta,
IN_var.lambda);
Re := max(1, Modelica.Fluid.Dissipation.Utilities.Functions.General.ReynoldsNumber(
IN_con.A_cross,
IN_con.perimeter,
IN_var.rho,
IN_var.eta,
abs(IN_var.m_flow))) "Reynolds number";
kc := Modelica.Fluid.Dissipation.HeatTransfer.General.kc_approxForcedConvection_KC(
IN_con, IN_var);
Nu := kc*d_hyd/max(MIN, IN_var.lambda);
//failure status
fstatus[1] := if IN_con.target == TYP.Rough then if Pr > prandtlMax[1] or Pr
< prandtlMin[1] then 1 else 0 else if IN_con.target == TYP.Middle then if
Pr > prandtlMax[2] or Pr < prandtlMin[2] then 1 else 0 else if IN_con.target
== TYP.Finest then if Pr > prandtlMax[3] or Pr < prandtlMin[3] then 1 else
0 else 0;
fstatus[2] := if IN_con.target == TYP.Rough then if Re > reynoldsMax[1] or Re
< reynoldsMin[1] then 1 else 0 else if IN_con.target == TYP.Middle then
if Re > reynoldsMax[2] or Re < reynoldsMin[2] then 1 else 0 else if IN_con.target
== TYP.Finest then if Re > reynoldsMax[3] or Re < reynoldsMin[3] then 1 else
0 else 0;
failureStatus := 0;
for i in 1:size(fstatus, 1) loop
if fstatus[i] == 1 then
failureStatus := 1;
end if;
end for;
annotation (Inline=false, Documentation(info="<html>
<p>
Approximate calculation of the mean convective heat transfer coefficient <strong> kc </strong> for forced convection with a fully developed fluid flow in a turbulent regime.
</p>
<p>
A detailed documentation for this convective heat transfer calculation can be found in its underlying function
<a href=\"modelica://Modelica.Fluid.Dissipation.HeatTransfer.General.kc_approxForcedConvection_KC\">kc_approxForcedConvection_KC</a> .
Note that additionally a failure status is observed in this function to check if the intended boundary conditions are fulfilled. <a href=\"modelica://Modelica.Fluid.Dissipation.Utilities.SharedDocumentation.HeatTransfer.General.kc_approxForcedConvection\">See more information</a> .
</p>
</html>"), smoothOrder(normallyConstant=IN_con) = 2);
end kc_approxForcedConvection;
function kc_approxForcedConvection_KC
"Mean convective heat transfer coefficient for forced convection | approximation | turbulent regime | hydrodynamically developed fluid flow"
extends Modelica.Icons.Function;
//SOURCE: A Bejan and A.D. Kraus. Heat Transfer handbook.John Wiley & Sons, 2nd edition, 2003. (p.424 ff)
//Notation of equations according to SOURCE
//type =
//input records
input
Modelica.Fluid.Dissipation.HeatTransfer.General.kc_approxForcedConvection_IN_con
IN_con "Input record for function kc_approxForcedConvection_KC"
annotation (Dialog(group="Constant inputs"));
input
Modelica.Fluid.Dissipation.HeatTransfer.General.kc_approxForcedConvection_IN_var
IN_var "Input record for function kc_approxForcedConvection_KC"
annotation (Dialog(group="Variable inputs"));
//output variables
output SI.CoefficientOfHeatTransfer kc
"Output for function kc_approxForcedConvection_KC";
protected
type TYP = Modelica.Fluid.Dissipation.Utilities.Types.kc_general;
Real MIN=Modelica.Constants.eps;
SI.Diameter d_hyd=max(MIN, 4*IN_con.A_cross/max(MIN, IN_con.perimeter))
"Hydraulic diameter";
SI.PrandtlNumber Pr=max(MIN, abs(IN_var.eta*IN_var.cp/max(MIN, IN_var.lambda)))
"Prandtl number";
SI.ReynoldsNumber Re=(4*abs(IN_var.m_flow)/max(MIN, IN_con.perimeter*
IN_var.eta)) "Reynolds number";
algorithm
kc := IN_var.lambda/d_hyd*(if IN_con.target == TYP.Rough then 0.023*Re^(4/5)*
Pr^IN_con.exp_Pr else if IN_con.target == TYP.Middle then 0.023*Re^(4/5)*Pr
^(1/3)*(IN_var.eta/IN_var.eta_wall)^0.14 else if IN_con.target == TYP.Finest and Pr
<= 1.5 then 0.0214*max(1, abs(Re^0.8 - 100))*Pr^0.4 else if IN_con.target
== TYP.Finest then 0.012*max(1, abs(Re^0.87 - 280))*Pr^0.4 else 0);
//Documentation
annotation (Inline=false, Documentation(info="<html>
<p>
Approximate calculation of the mean convective heat transfer coefficient <strong> kc </strong> for forced convection with a fully developed fluid flow in a turbulent regime.
<a href=\"modelica://Modelica.Fluid.Dissipation.Utilities.SharedDocumentation.HeatTransfer.General.kc_approxForcedConvection\">See more information</a> .
</p>
</html>", revisions="<html>
<p>2016-04-11 Stefan Wischhusen: Removed singularity for Re at zero mass flow rate.</p>
</html>"), smoothOrder(normallyConstant=IN_con) = 2);
end kc_approxForcedConvection_KC;
record kc_approxForcedConvection_IN_con
"Input record for function kc_approxForcedConvection and kc_approxForcedConvection_KC"
//generic variables
extends
Modelica.Fluid.Dissipation.Utilities.Records.HeatTransfer.General;
parameter Real exp_Pr=0.4
"Exponent for Prandtl number w.r.t. Dittus/Boelter | 0.4 for heating | 0.3 for cooling"
annotation (Dialog(group="Generic variables",enable=target == Modelica.Fluid.Dissipation.Utilities.Types.kc_general.Rough));
annotation (Documentation(info="<html>
This record is used as <strong> input record </strong> for the heat transfer function <a href=\"Modelica://Modelica.Fluid.Dissipation.HeatTransfer.General.kc_approxForcedConvection\"> kc_approxForcedConvection</a> and
<a href=\"Modelica://Modelica.Fluid.Dissipation.HeatTransfer.General.kc_approxForcedConvection_KC\"> kc_approxForcedConvection_KC</a>.
</html>", revisions="<html>
2016-06-06 Stefan Wischhusen: Corrected enable in dialog.
</html>"));
end kc_approxForcedConvection_IN_con;
record kc_approxForcedConvection_IN_var
"Input record for function kc_approxForcedConvection and kc_approxForcedConvection_KC"
//fluid property variables
extends
Modelica.Fluid.Dissipation.Utilities.Records.General.FluidProperties;
SI.DynamicViscosity eta_wall
"Dynamic viscosity of fluid at wall temperature" annotation (Dialog(group=
"Fluid properties", enable= target == 2));
//input variable (mass flow rate)
SI.MassFlowRate m_flow annotation (Dialog(group="Input"));
annotation (Documentation(info="<html>
This record is used as <strong> input record </strong> for the heat transfer function <a href=\"Modelica://Modelica.Fluid.Dissipation.HeatTransfer.General.kc_approxForcedConvection\"> kc_approxForcedConvection</a> and
<a href=\"Modelica://Modelica.Fluid.Dissipation.HeatTransfer.General.kc_approxForcedConvection_KC\"> kc_approxForcedConvection_KC</a>.
</html>"));
end kc_approxForcedConvection_IN_var;
annotation (preferredView="info", Documentation(info="<html>
<h4>General heat transfer</h4>
<h5>Approximated forced convection</h5>
<p>Approximate calculation of the mean convective heat transfer coefficient <strong> kc </strong> for forced convection with a fully developed fluid flow in a turbulent regime. <a href=\"modelica://Modelica.Fluid.Dissipation.Utilities.SharedDocumentation.HeatTransfer.General.kc_approxForcedConvection\">See more information.</a></p>
</html>"));
end General;
package HeatExchanger
extends Modelica.Icons.VariantsPackage;
function kc_flatTube
extends Modelica.Icons.Function;
//SOURCE: A.M. Jacobi, Y. Park, D. Tafti, X. Zhang. AN ASSESSMENT OF THE STATE OF THE ART, AND POTENTIAL DESIGN IMPROVEMENTS, FOR FLAT-TUBE HEAT EXCHANGERS IN AIR CONDITIONING AND REFRIGERATION APPLICATIONS - PHASE I
//icon
//input records
input
Modelica.Fluid.Dissipation.HeatTransfer.HeatExchanger.kc_flatTube_IN_con