Mixtures of stearyl alcohol with palm triple pressed acid (essentially a mixture of palmitic and stearic acid derived from palm oil) were prepared and characterized to assess their phase change thermal energy storage utility. Unlike the other mixtures, the 35 mol% stearyl alcohol mixture showed a single crystallization exotherm peak, albeit with a small shoulder, in differential scanning calorimetry. The enthalpy associated with this phase change was 158 +- 5 kJ kg-1 and the crystallization peak temperature was 46 deg.C. Inclusion of 10 wt.% graphite nanoplatelets increased the solid state and melt state thermal conductivities by factors of approximately six and twelve respectively. This nanocomposite showed no deterioration in thermal properties after hundred heating and cooling cycles between the end-temperatures of 30 deg.C and 60 deg.C when scanned at a rate of 10 deg.C min-1. There was also no evidence of graphite platelet sedimentation in the molten liquid after two months at 80 deg.C.
Compounds
#
Formula
Name
1
C18H38O
1-octadecanol
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.
Type
Compound-#
Property
Variable
Constraint
Phase
Method
#Points
POMD
1
Normal melting temperature, K ; Crystal
Crystal
Liquid
Air at 1 atmosphere
DTA:corrimp
1
POMD
1
Molar enthalpy of transition or fusion, kJ/mol ; Crystal 2