Wednesday, 30 October 2019

Simple poly-fit for MEA heat capacity

Simple polynomial fit to data for the specific heat capacity of monoethanolamine
as a function of temperature, CO2 loading, and concentration.


Where: 
Cp = heat capacity (kJ/kg-K)
T = temperature (°C)
,x = mass fraction of MEA, or, weight percent MEA
,α = CO2 loading (mol CO2/mol MEA)
Just a poly fit to data from:
“Heat Capacity of Aqueous Monoethanolamine, Diethanolamine, N-Methyldiethanolamine,
and N-Methyldiethanolamine-Based Blends with Carbon Dioxide”
For effect of loading on Cp
“Heat Capacity of Alkanolamine Aqueous Solutions (Li-Feng Chiu and Meng-Hui Li)”
For effect of high MEA concentration on Cp

For pure water data.






Data: 



data
vs. fit

T (degC)
wt%
load alpha
CP (kJ/kg-K)
CP (kJ/kg-K)
out by: 
25
10%
0
4.061
4.04
0.5%
25
10%
0.05
4.015
3.99
0.5%
25
10%
0.1
3.823
3.95
3.4%
25
10%
0.2
3.917
3.89
0.6%
25
10%
0.3
3.915
3.86
1.4%
25
10%
0.4
3.891
3.86
0.8%
25
10%
0.5
3.857
3.88
0.7%
25
20%
0
3.911
3.91
0.0%
25
20%
0.1
3.656
3.80
3.9%
25
20%
0.2
3.766
3.71
1.4%
25
20%
0.3
3.670
3.66
0.3%
25
20%
0.4
3.648
3.63
0.5%
25
20%
0.5
3.597
3.63
1.0%
25
30%
0
3.734
3.77
1.0%
25
30%
0.1
3.508
3.63
3.6%
25
30%
0.2
3.570
3.53
1.2%
25
30%
0.3
3.457
3.45
0.3%
25
30%
0.4
3.418
3.40
0.6%
25
30%
0.5
3.359
3.37
0.5%
25
40%
0
3.634
3.63
0.2%
25
40%
0.2
3.343
3.34
0.2%
25
40%
0.3
3.238
3.23
0.2%
25
40%
0.4
3.163
3.16
0.2%
25
40%
0.5
3.109
3.11
0.1%
30
46%
0
3.523
3.56
1.1%
35
46%
0
3.549
3.58
0.9%
40
46%
0
3.575
3.60
0.7%
45
46%
0
3.601
3.62
0.5%
50
46%
0
3.628
3.64
0.4%
55
46%
0
3.658
3.66
0.1%
60
46%
0
3.684
3.68
0.1%
65
46%
0
3.710
3.70
0.2%
70
46%
0
3.737
3.72
0.4%
75
46%
0
3.755
3.74
0.3%
80
46%
0
3.793
3.76
0.8%
30
69%
0
3.178
3.20
0.7%
35
69%
0
3.235
3.23
0.1%
40
69%
0
3.263
3.26
0.1%
45
69%
0
3.292
3.29
0.1%
50
69%
0
3.320
3.32
0.1%
55
69%
0
3.377
3.35
0.9%
60
69%
0
3.405
3.37
0.9%
65
69%
0
3.433
3.40
0.9%
70
69%
0
3.462
3.43
0.8%
75
69%
0
3.519
3.46
1.6%
80
69%
0
3.547
3.49
1.6%
30
84%
0
2.987
2.97
0.6%
35
84%
0
3.010
3.00
0.3%
40
84%
0
3.056
3.04
0.6%
45
84%
0
3.078
3.07
0.3%
50
84%
0
3.124
3.10
0.6%
55
84%
0
3.147
3.14
0.2%
60
84%
0
3.170
3.17
0.1%
65
84%
0
3.215
3.21
0.2%
70
84%
0
3.238
3.24
0.1%
75
84%
0
3.284
3.28
0.2%
80
84%
0
3.306
3.31
0.1%
30
93%
0
2.840
2.80
1.2%
35
93%
0
2.859
2.84
0.6%
40
93%
0
2.897
2.88
0.6%
45
93%
0
2.916
2.92
0.1%
50
93%
0
2.954
2.96
0.1%
55
93%
0
2.973
2.99
0.7%
60
93%
0
3.011
3.03
0.7%
65
93%
0
3.030
3.07
1.3%
70
93%
0
3.069
3.11
1.2%
75
93%
0
3.088
3.14
1.8%
80
93%
0
3.126
3.18
1.8%
0.01
0
0
4.220
4.15
1.6%
10
0
0
4.196
4.16
0.8%
20
0
0
4.184
4.17
0.4%
25
0
0
4.182
4.17
0.3%
30
0
0
4.180
4.17
0.2%
40
0
0
4.180
4.18
0.0%
50
0
0
4.182
4.19
0.1%
60
0
0
4.185
4.19
0.2%
70
0
0
4.190
4.20
0.2%
80
0
0
4.197
4.20
0.2%
90
0
0
4.205
4.21
0.1%
100
0
0
4.216
4.22
0.0%


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