2
0
2017
ma
han
0
journal
Original
Ma, G.[Guixiang]
Han, L.[Lipeng]
Sun, J.[Jinhe]
Jia, Y.[Yongzhong]
J. Chem. Thermodyn.
2017
2020-09-29
Thermal properties and reliability of eutectic mixture of stearic acid-acetamide as phase change material for latent heat storage
The thermal properties and reliability of the stearic acid (SA) with acetamide (AC) binary mixture were characterized using differential scanning calorimetry (DSC), powder X-ray diffraction (XRD), thermogravimetric analysis (TG) and Fourier transform infrared spectroscopy (FT-IR). The phase diagrams for the SA-AC binary mixture with AC in the metastable and the stable form were constructed. The eutectic system with stable AC is 0.604 mol fraction SA, and displayed a melting temperature (Tm) of 64.55 C and latent heat of melting (DHm) of 193.87 J g-1. The eutectic systems with metastable AC are 0.397 and 0.604 mol fraction SA. The melting temperatures are 62.23 C and 62.54 C, and latent heats of fusion are 222.10 J g-1 and 194.28 J g-1, respectively. Following accelerated thermal cycling tests, TG and FTIR analysis indicate that the eutectic mixture (vSA = 0.397) with the metastable AC has good cyclic and thermal stability. The results show that the SA-AC eutectic mixture use as phase change material (PCM) possess good prospect for low temperature thermal energy storage (TES) applications.
Phase change material
Stearic acid
Acetamide
Eutectic mixture
Thermal properties
Thermal reliability
10.1016/j.jct.2016.11.022
106
178-186
1
InChI=1S/C18H36O2/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20/h2-17H2,1H3,(H,19,20)
QIQXTHQIDYTFRH-UHFFFAOYSA-N
octadecanoic acid
n-octadecanoic acid
stearic acid
C18H36O2
1
Commercial source
1
98
2
Stated by supplier
2
InChI=1S/C2H5NO/c1-2(3)4/h1H3,(H2,3,4)
DLFVBJFMPXGRIB-UHFFFAOYSA-N
ethanamide
acetamide
acetic acid amide
acetimidic acid
methanecarboxamide
C2H5NO
1
Commercial source
1
98
2
Stated by supplier
1
1
1
Principal objective of the work
AB
TRC
7/31/2017
1
Normal melting temperature, K
DTA
Crystal
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Crystal
Liquid
Air at 1 atmosphere
1
342.62
4
1
1.06
2
1
1
Principal objective of the work
AB
TRC
7/31/2017
1
Molar enthalpy of transition or fusion, kJ/mol
DSC
Crystal
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Crystal
Liquid
Air at 1 atmosphere
1
60.3717598728
5
1
6.144708384
3
2
1
Principal objective of the work
AB
TRC
7/31/2017
1
Normal melting temperature, K
DTA
Crystal
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Crystal
Liquid
Air at 1 atmosphere
1
353.77
4
1
1.06
4
2
1
Principal objective of the work
AB
TRC
7/31/2017
1
Normal melting temperature, K
DTA
Metastable crystal
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Metastable crystal
Liquid
Air at 1 atmosphere
1
343.29
4
1
1.06
5
2
1
Principal objective of the work
AB
TRC
7/31/2017
1
Molar enthalpy of transition or fusion, kJ/mol
DSC
Crystal
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Crystal
Liquid
Air at 1 atmosphere
1
13.6486671468
5
1
1.4034376224
6
2
1
Principal objective of the work
AB
TRC
7/31/2017
1
Molar enthalpy of transition or fusion, kJ/mol
DSC
Metastable crystal
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Metastable crystal
Liquid
Air at 1 atmosphere
1
11.6279768664
5
1
1.199064972
7
1
1
2
1
Principal objective of the work
AB
TRC
7/31/2017
1
Eutectic temperature, K
DTA
Crystal of intercomponent compound 1
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Crystal of intercomponent compound 1
Crystal
2
Liquid
Air at 1 atmosphere
1
337.66
4
1
1.06
8
1
1
2
1
Principal objective of the work
AB
TRC
7/31/2017
1
Eutectic temperature, K
DTA
Crystal
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Crystal
1
Crystal of intercomponent compound 1
Liquid
Air at 1 atmosphere
1
337.55
4
1
1.06
9
1
1
2
1
Principal objective of the work
AB
TRC
7/31/2017
1
Eutectic temperature, K
DTA
Crystal of intercomponent compound 1
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Crystal of intercomponent compound 1
Metastable crystal
2
Liquid
Air at 1 atmosphere
1
335.67
4
1
1.06
10
1
1
2
1
Principal objective of the work
AB
TRC
7/31/2017
1
Eutectic temperature, K
DTA
Crystal
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Crystal
1
Crystal of intercomponent compound 2
Liquid
Air at 1 atmosphere
1
335.28
4
1
1.06
11
1
1
2
1
Principal objective of the work
AB
TRC
7/31/2017
1
Solid-liquid equilibrium temperature, K
DTA
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
Crystal
2
1
Pressure, kPa
Liquid
101
3
1
Mole fraction
1
Liquid
1
0
4
1
353.77
4
1
1.06
1
0.023
2
1
353.59
4
1
1.06
1
0.049
2
1
353.47
4
1
1.06
1
0.082
2
1
353.41
4
1
1.06
1
0.122
3
1
353.17
4
1
1.07
1
0.172
3
1
352.42
4
1
1.07
1
0.237
3
1
351.96
4
1
1.07
1
0.278
3
1
351.3
4
1
1.08
1
0.326
3
1
350.16
4
1
1.11
1
0.348
3
1
348.96
4
1
1.15
1
0.371
3
1
348.1
4
1
1.28
1
0.397
3
1
345.5
4
1
1.73
1
0.424
3
1
340.87
4
1
1.58
1
0.454
3
1
338.75
4
1
1.27
12
1
1
2
1
Principal objective of the work
AB
TRC
7/31/2017
1
Solid-liquid equilibrium temperature, K
DTA
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
Crystal
1
1
Pressure, kPa
Liquid
101
3
1
Mole fraction
1
Liquid
1
0.604
3
1
337.7
4
1
1.07
1
0.651
3
1
338.46
4
1
1.07
1
0.705
3
1
339.06
4
1
1.07
1
0.765
3
1
339.67
4
1
1.07
1
0.833
3
1
340.79
4
1
1.07
1
0.911
3
1
341.86
4
1
1.07
1
1
4
1
342.62
4
1
1.06
1
0.604
3
1
335.69
4
1
1.21
1
0.651
3
1
336
4
1
1.07
1
0.705
3
1
337.54
4
1
1.07
1
0.765
3
1
338.92
4
1
1.07
1
0.833
3
1
339.48
4
1
1.07
1
0.911
3
1
340.79
4
1
1.07
13
1
1
2
1
Principal objective of the work
AB
TRC
7/31/2017
1
Solid-liquid equilibrium temperature, K
DTA
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
Crystal of intercomponent compound 1
1
Pressure, kPa
Liquid
101
3
1
Mole fraction
1
Liquid
1
0.454
3
1
338.75
4
1
1.06
1
0.486
3
1
338.81
4
1
1.06
1
0.522
3
1
338.52
4
1
1.06
1
0.561
3
1
338.12
4
1
1.07
1
0.604
3
1
337.7
4
1
1.07
14
1
1
2
1
Principal objective of the work
AB
TRC
7/31/2017
1
Solid-liquid equilibrium temperature, K
DTA
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
Metastable crystal
2
1
Pressure, kPa
Liquid
101
3
1
Mole fraction
1
Liquid
1
0
4
1
343.29
4
1
1.06
1
0.023
2
1
343.27
4
1
1.06
1
0.049
2
1
343.19
4
1
1.06
1
0.082
2
1
343.15
4
1
1.06
1
0.122
3
1
343.11
4
1
1.06
1
0.172
3
1
342.64
4
1
1.07
1
0.237
3
1
341.69
4
1
1.07
1
0.278
3
1
341.27
4
1
1.08
1
0.326
3
1
339.79
4
1
1.11
1
0.348
3
1
339
4
1
1.12
1
0.371
3
1
338.16
4
1
1.3
1
0.397
3
1
335.38
4
1
1.51
15
1
1
2
1
Principal objective of the work
AB
TRC
7/31/2017
1
Solid-liquid equilibrium temperature, K
DTA
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
Crystal of intercomponent compound 2
1
Pressure, kPa
Liquid
101
3
1
Mole fraction
1
Liquid
1
0.397
3
1
335.38
4
1
1.14
1
0.424
3
1
336.49
4
1
1.08
1
0.454
3
1
336.66
4
1
1.06
1
0.486
3
1
336.57
4
1
1.06
1
0.522
3
1
336.4
4
1
1.06
1
0.561
3
1
335.91
4
1
1.07