Preparation and Energy Storage Properties of a Lauric acid/Octadecanol Eutectic Mixture

Abstract

A phase change material (PCM) has the characteristics of latent heat storage, controllable phase transition temperature (PTT), and chemical stability. It can naturally regulate the ambient temperature in a certain range and reduce the load of air conditioning operation. Therefore, it plays an important role in the field of energy-saving buildings, and the PTT of PCM is one of the decisive factors. In this paper, through analyzing PCM installed in solar buildings at various regions, a binary eutectic mixture (EM) was prepared from lauric acid (LA) and octadecanol (OD) by the method of mixed melting, and the PTT and enthalpy of the EM were 39.87 °C and 186.94 J/g, respectively. The PTT, latent heat, and EM ratio were determined by theoretical calculation, the step cooling curve, and DSC. FT-IR result shows that no chemical reaction occurs among the components of composites, and the molecular forces are uniform and stable. XRD results further proves that no other phases existed in the composites. Thermal cycles (500) and the TG test show that the EM has excellent thermal stability and heat resistance, which meets the engineering application. Due to the thermodynamic properties of the EM, it can be used in thermal cooling of electronic systems, building envelopes, and thermal storage in solar buildings to obtain a good energy-saving effect.

Novel protic ionic liquids-based phase change materials for high performance thermal energy storage systems

“…Using the 2-hydroxyethylammonium [HEA]Pal, bis(2-hydroxyethyl)ammonium [DHEA]Pal, and tris(2-hydroxyethyl)ammonium palmitate [THEA] Pal ILs as a base, we describe a unique PCM here. Peaks at approximately 1075 cm −1 are used to represent the anti-symmetric stretching vibration peaks of CH 3 , where they appear as two faint peaks 39 . In all ILs, there is a peak that corresponds to N-H at about 3359-3384 cm −1 .…”

Surface Basicity and Hydrophilic Character of Coal Ash-Derived Zeolite NaP1 Modified by Fatty Acids

“…As a general tendency, supported fatty acids are more thermally stable than free molecules [ 80 , 81 , 82 , 83 ]. In addition, saturated and short chain fatty acid are the most stable below 300 °C, resulting in a decrease in thermal stability in the following sequence: lauric acid ˃ palmitic acid ˃ oleic acid [ 84 , 85 , 86 , 87 ]. Similar TPD patterns were achieved after repeated desorption–wet CO 2 re-saturation cycles, providing clear evidence of the thermal stability of the investigated samples within the range of 20–120 °C, with a consecutive stepwise thermal desorption (STD) at a constant temperature of 120 °C for 20 min.…”

Formulation and phase change mechanism of Capric acid/Octadecanol binary composite phase change materials

“…According to the second law of thermodynamics and the theory of phase equilibrium [33,34], the best molar ratio and the minimum crystallization temperature of the binary composite PCMs can be obtained by Schroeder's formula (1).…”

“…Because fatty acids and fatty alcohols mainly come from the natural animal fat and vegetable oil, they have compared with paraffin lower flammability and better biodegradability [17,33]. The compounded binary composite PCM of fatty acids and fatty alcohols has good thermal stability, chemical compatibility and long-term cycling reliability, and can be a low energy consumption thermal energy storage (TES) material [34,35]. To obtain a PCMs that is more suitable for use in the built environment, the phase transition temperature (PTT) must be suitable, e.g.…”