Latent Heat Of Solidification Research Articles

Preparation and characterization of phase change material emulsions and their applications in liquid cooling systems for wind turbines

In order to improve the effect of liquid cooling system for wind turbine, this study used ultrasonic preparation method, stearic acid as phase change material, sorbitan trioleate and sodium lauryl sulfate as compound surfactants successfully prepared stearic acid phase change material emulsion as a cooling medium for investigation. The characterization, thermophysical properties, and fluidity of stearic acid phase change material emulsions at varying concentrations were examined through differential scanning calorimetry, thermal constant analysis, and viscometry. To investigate the cooling effects, a stator axial liquid cooling model was developed for both water and a 14 % stearic acid phase change material emulsion. Findings revealed that the 14 % stearic acid phase change material emulsion exhibited a latent heat of phase change of 22.5 J/g, reaching a peak melting temperature of 68.7 °C. Additionally, the latent heat of solidification was measured at 21.08 J/g, accompanied by a peak solidification temperature of 60.3 °C. The maximum thermal conductivity reached 0.5801 W/(m·K), and the specific heat capacity peaked at 5219.8 J/(K·mol), marking a notable improvement of 1.26 times. Under an inlet temperature of 30 °C and a flow rate of 1 L/min, stearic acid phase change material emulsion effectively lowered the temperatures of the windings, stator, rotor, and casing by 19.2 °C, 23.6 °C, 19.2 °C, and 9.6 °C, respectively. stearic acid phase change material emulsion demonstrates excellent temperature control effectiveness at 3600 r/min and a low flow rate of 1 L/min, showcasing efficient energy utilization efficiency.

Preparation of mono-sized high sphericity Al-Si alloy particles for thermal energy storage materials by pulsated orifice ejection method

The demand for Al-Si particles with high sphericity and narrow size distribution is growing in the field of thermal energy storage. In this study, a novel pulsated orifice ejection method (POEM) was successfully employed to produce different-sized Al-Si alloy particles. The analysis indicates that such particles exhibit high sphericity, with each particle having a sphericity exceeding 0.9. The particles are precisely size-controllable and mono-sized, thereby ensuring that they have the identical thermal history. The combination of cooling rate calculation and particle structure analysis indicates that the particles prepared by POEM exhibit higher cooling rates through rapid solidification, resulting in finer and more uniform microstructures. The thermal analysis results demonstrate that the Al-Si alloy particles prepared in this study have high melting latent heat (approximately 500.87 J/g) and solidification latent heat (approximately 467.26 J/g), showcasing their potential as high-efficiency phase change materials for high-temperature thermal energy storage.

Energy and exergy analysis of a novel dual-source heat pump system with integrated phase change energy storage

In order to improve the application of renewable energy in cold regions and overcome the drawback of the low performance of traditional air source heat pumps (ASHP) in a low temperature environment, a novel type of dual-source heat pump system is proposed, which includes a heat pump, photovoltaic–thermal (PVT) modules, an air heat exchanger, and phase-change energy storage equipment. In response to different outdoor environmental parameters, the heat pump can use the PVT, ambient air, or solidification latent heat of water in the ice tank as the heat source. This study focuses on analyzing the applicability of this novel system in residential buildings. Firstly, the thermodynamic performance of the system under typical operating conditions is experimentally analyzed, proving that the system can effectively utilize solar energy under low solar irradiation. Then, the operational strategy of the system is optimized with the optimization goal of system exergy efficiency. Finally, the continuous operation performance of the system in winter is simulated and analyzed. The results show that the utilization ratio of solar energy reaches 2/3 in winter. Compared with the traditional ASHP system, the energy-saving rate of the novel system is 73.6 %, which can reduce the carbon emissions by 69 %. These results provide technical guidance for the application of the novel system in residential buildings in cold regions.

Effect of B on the microstructure and mechanical properties of Cu–Cu joints with in-situ Ag–Cu–Zn–Sn filler metal

With the development of advanced manufacturing, traditional Ag-based filler metals cannot reconcile the contradiction between high performance and complex processing. It also unable to meet the requirements of new materials, new structures and new processes for brazing connection performance. In this paper, based on the Ag–Cu–Zn–Sn flux-cored filler metal, the effect of the addition of B on the microstructure and mechanical properties of Cu–Cu brazing joints was investigated using FESEM‒EDS, EPMA, EBSD, TEM, microindenter and universal tensile testing machine. The results indicated that the microstructure in the brazing seam was mainly composed of Ag (s.s), Cu(s.s) and (Ag + Cu) eutectic. With increasing B content, the grain size and texture strength of Ag(s) and Cu(s) gradually decreased. The refinement of Ag-rich dendrites was mainly due to the enrichment of B atoms around the dendrite, which limited the diffusion of solute atoms in the melt and the release of solidification latent heat in front of the liquid‒solid interface, further inhibiting the growth of Ag-rich dendrites. The refinement behavior of Cu-rich dendrites was mainly attributed to the increase in B content, which reduced the tip radius of Cu-rich dendrites. The mass transfer path of B → B2O3 and B → liquid CuSn alloy → mixed melt of CuSn alloy + solder skin alloy → liquid filler metal in the brazed joint → Cu rich phase and grain boundary in the brazed joint → Ag rich phase and grain boundary in the brazing seam was clarified. The addition of B can improve the microhardness of the brazing seam. The shear strength reached a maximum value of 237.2 MPa when B was added at 2%. The fracture models mainly included intergranular fracture, dimple fracture and cleavage fracture. The strength of brazed joints can be improved by solid solution strengthening, process hardening strengthening and fine grain strengthening. The tangle and jog of dislocations within the crystal, the presence of a large number of grain boundaries and B-rich areas can prevent crack tip extension and enhance the toughness of brazing joints.

Erythritol/expanded graphite form-stable phase change materials with excellent thermophysical properties

Organic phase change materials possess the merits of high latent heat storage, small temperature changes, high chemical/thermal stability, low corrosion and reusability, and thus have attracted extensive attention in the research of low and medium-temperature energy storage media. However, pure phase change material has the deficiency of low thermal conductivity and easy leakiness, which seriously hinder their practical large-scale applications. In this work, the expanded graphite was used as the skeleton to encapsulate erythritol to form the composite phase change material. The composite had remarkably boosted thermal conductivity (5.97 ± 0.30 W/m·K compared with pure erythritol of 0.60 ± 0.03 W/m·K) and high melting latent heat (290.52 J/g) and solidification latent heat (239.52 J/g) at a loading rate of 95 wt%. The supercooling degree was reduced from 92.41 °C to 43.75 °C, facilitating the release of latent heat. The developed composite phase change material exhibits extraordinary heat transfer and storage characteristics, which has great application prospects in the fields of solar photothermal conversion utilization.

Thermal and solute diffusion in [formula omitted]-Mg dendrite growth of Mg-5wt.%Zn alloy: A phase-field study

Thermal and solute diffusion plays an important role in α-Mg dendrite growth, the diffusion mechanism of which is still unclear. Here, thermal and solute diffusion in α-Mg dendrite growth of Mg-5wt.%Zn alloy under non-isothermal solidification were studied using the phase-field method. Results show that solidification latent heat will be concentrated at the dendrite intersection, which makes thermal field distribution non-uniform, and it is similar to the profile formed by connecting primary dendrite tips. The increase in temperature will shorten primary dendrite arms, reduce side-branching development, increase dendrite tip temperature, and decrease dendrite tip concentration stability. Moreover, solidification latent heat will first diffuse to undercooled melt, then diffuse to other areas, finally, system temperature tends to be unified. The variation range of concentration difference is very small in the solidification process, and solute field distribution is uniform all the time. The local high-concentration areas will be formed after the superposition of the solute enrichment layer, and solute atoms will first diffuse to undercooled melt through the solid-liquid interface, and then concentrate between side-branching and dendrites.

Microstructure refinement mechanisms in undercooled solidification of binary and ternary nickel based alloys

Molten glass purification and cycle superheating technologies were used to make Ni65Cu35, Ni65Cu33Co2 and Ni65Cu31Co4 alloys obtain maximum undercoolings of 320 K, 292 K and 300 K respectively. In order to analyze the relationship between morphological characteristics of solidification front and undercooling change during migration of solid–liquid interface, a high-speed camera was used to capture pictures of the recalescence process. Observing the microstructure of the undercooled alloys using metallographic microscope, the characteristics and evolution of microstructure during rapid solidification process of undercooled liquids were analyzed. It was found that grain refinement mechanisms of highly undercooled Ni–Cu–Co alloys was the same as those of the Ni–Cu alloys. Dendrite remelting leads to the grain refinement at low undercooling, while the dominant factor of grain refinement at high undercooling is recrystallization process induced by stress. The internal driving force can be divided into two parts: one is the thermal stress generated by the releasing of solidification latent heat during recalescence process, and the other is the stress and strain accumulated by interaction of liquid flow and primary dendrite during rapid solidification. We also found that addition of third element Co not only played an important role in solidification rate and recalescence effect, but also significantly improved the average hardness of grain refined microstructure, which was about 80% higher than that of as cast alloy. The addition of trace Co was also conducive to the formation of non-segregation solidification microstructure.

Al–Ni alloy-based core-shell type microencapsulated phase change material for high temperature thermal energy utilization

Latent heat thermal energy storage (LHTES) using alloy-based phase-change materials (PCMs) is a promising technique for stabilizing the power supply of grid-connected renewable energies. In particular, recently developed alloy-based microencapsulated PCMs (MEPCMs) are attracting considerable attention owing to their ease of handling and ability to overcome the problems of corrosion and melting leakage experienced by alloy PCMs. To expand high-temperature LHTES, more MEPCMs need to be developed. In this study, an MEPCM was developed using Al-5 wt.%Ni alloy (melting point 640°C). Microencapsulation was performed in two steps: 1) Al hydroxide layer formation on the surface of PCM particles by boehmite treatment in boiling water for 1 h or 3 h and 2) Al 2 O 3 shell formation by heat oxidation treatment in an O 2 atmosphere. The prepared MEPCM consisted of an α-Al 2 O 3 shell and an Al–Ni alloy core. The sample after 1 h of boehmite treatment and heat oxidation treatment had melting and solidification latent heat capacities of 241 J g –1 and 251 J g –1 , respectively. The developed MEPCM maintained its original shape and high latent heat capacity, even after 100 cycles of melting and solidification. The developed Al–Ni alloy-based MEPCM is expected to be applied to next-generation LHTES, in which a large-scale and ultrafast heat exchange system is employed in a small space by cascade configuration with other MEPCMs with different melting points. In addition, the formation of the Al–Ni alloy core/α-Al 2 O 3 shell structure was investigated thermodynamically, providing insights that will promote the development of Al- X alloy-based MEPCMs in the future. • Al–Ni alloy based microencapsulated phase change materials (MEPCMs) were developed. • The prepared MEPCM consisted of an α-Al 2 O 3 shell and an Al–Ni alloy core. • The MEPCM exhibited high thermal storage capacity about 241 - 251 J g -1 . • The MEPCM had melting temperature of 640°C. • They are good candidates for high-temperature thermal energy storage application.

Numerical modeling on formation of periodic chain-like pores in high power laser welding of thick steel plate

The porosity with chain-like shape is found in high power laser welding of thick steel plate, which are periodically distributed at the lower and middle parts of the weld and parallel to bottom fusion line. A 3D numerical model is developed to reveal the effect of laser energy absorption and transfer, keyhole fluctuation, molten pool flow and solidification behavior on the formation process of chain-like pores. It is found that the chain-like pores are mainly determined by the unique profile of molten pool concaved inward at middle part on its rear wall. The periodic distribution of chain-like pores is resulted of the periodic variation of molten pool profile influenced by simultaneous periodic change of keyhole collapse frequency, heat accumulation at lower part, heat transfer through clockwise vortex as well as solidification latent heat accumulation at middle part. With the increasing of weld speed, the distribution of pores changes to form in the same height from the bottom fusion line due to the unchanged molten pool profile, which is resulted from insufficient solidification latent heat accumulation at middle part and less heat transferred by weaken upward flow in clockwise vortex. While the bubbles tend to reach a relatively higher position or escape from molten pool for more heat input, slower solidification speed and violent upward flow in clockwise vortex when weld speed decreases.

Study on prevention method of hot cracking under butt welding

For the automation of butt welding, it has been considered to introduce tack welds instead of out-of-plane restraint jigs to perform welding with large heat input. However, the occurrence of hot cracking has been a significant issue in large heat input welding. In the previous report, the authors have developed a prediction method of hot cracking that can investigate the influence of not only the high-temperature strain generated in the weld metal but also the phenomena related to solidification, such as solidification shrinkage, latent heat of solidification, and crystals growth direction. In this study, the conditions for the prevention of hot cracking were investigated by numerical analysis and experiments by controlling the temperature gradient at solidification temperature using a trailing torch in tandem welding. As a result, it was confirmed that the large strain existing position predicted using the proposed hot cracking analysis has a good agreement with the cracking position observed experimentally in tandem butt weld. It was also found that with increasing the electrode distance, both the columnar crystals' associate angle became larger and the local strain became smaller. It can be concluded that the hot cracking can be successfully prevented in the practical experiments using the proposed large electrode distance.

Polyethylene glycol / nanofibrous Kevlar aerogel composite: Fabrication, confinement effect, thermal energy storage and insulation performance

In order to develop a new type of dual-functional composite with thermal storage and insulation properties, polyethylene glycol / nanofibrous Kevlar aerogel (PEG/KNA) was fabricated by combining the heat storage advantage of PEG and low thermal conductivity of KNA. The morphology, structure and thermo-physical performances, especially the thermal insulation property and effects of confinement on the phase transition behavior were investigated. The results demonstrate that PEG was trapped and fixed in the pores of KNA by physical interaction. The maximal fusion and solidification latent heat for the leak-free PEG 10K/KAN are 173.77 J·g−1 and 173.79 J·g−1, while they are 163.10 J·g−1 and 162.33 J·g−1 for PEG 6K/KNA, respectively. The actual values of all PEG/KNA are lower than the theoretical enthalpy, and the heat storage capacity reduce sharply with the decrease of PEG loading amount due to the formation of "non - melting layer" on the interface of KNA films. This portion of PEG in the non-melting layer is amorphous and does not contribute to heat storage. The crystallization rate of PEG/KNA is lower than that of pure PEG due to the confinement effects of KNA. In addition, PEG/KNA demonstrates good stability and excellent thermal insulation performance during cyclic usage. This study not only developed a feasible way for the design of thermal insulation composites, but also provided a deep insight for revelation of confinement effects on the thermophysical properties of composite phase change material.

Numerical Calculation of the Arc-Sprayed Particles’ Temperature in Transient Thermal Field

The physical and mechanical properties of the coatings produced by electric arc thermal spraying are closely related to the velocity and temperature of the particles that interact with the substrate surface. Knowing the temperature variation of the sprayed particles allows establishing their aggregation state, respectively determining the spraying distance, so that the state of aggregation of the particles at the impact moment is predominantly liquid. Obviously, when the sprayed particle passes through the spray cone, it cools continuously due to the low and variable temperature of the entrainment gas. This paper aims to determine analytically the thermal behavior of the particles entrained by the gas jet formed at the thermal spraying in an electric arc, depending on the variable temperature, existing along the spraying cone. In this sense, by modeling with finite elements, using the ANSYS program, the temperature inside the spray jet was determined, and by a mathematical model carried out based on the thermal balance equations, the thermal profile of the sprayed particles was determined. The thermal profile demonstrates that their temperature suddenly increases to the solidification temperature, then increases to the melting temperature—due to the latent heat of solidification, after which it decreases to 300 K.

Development of a shape-stabilized phase change material utilizing natural and industrial byproducts for thermal energy storage in buildings

A comprehensive study was conducted to develop and utilize a novel shape-stabilized phase change material utilizing two abundantly available and low-cost natural materials, namely scoria and expanded perlite and an industrial byproduct, heavy oil ash, in combination with polyethylene glycol. The thermal and energy storage characteristics of the composite materials were evaluated with the aim of using them to conserve energy in the domestic facilities. The results of differential scanning calorimetry showed that expanded perlite composite has the highest melting and solidification latent heat values, 150.7 J/g and 134.6 J/g, respectively, compared to scoria and oil ash composite. However, expanded perlite composite has lower thermal conductivity compared to other composites. Consequently, a novel system incorporating carbon nano tubes (0.5 wt.% and 1 wt.%) in the expanded perlite composite was developed to improve its thermal conductivity. The thermal conductivity (0.453 W/m.K) of the new system with 0.5% carbon nano tubes is remarkably more than that of commonly used phase change materials. Further, the developed PCM with 0.5% carbon nano tubes can transform sunlight into thermal energy with a solar-to-thermal energy conversion efficiency of 59.4% and it has a thermal conductivity that is 97% more than that of polyethylene glycol alone. Besides, the newly developed PCM also shows excellent energy storage and release performance. All these favorable characteristics indicate that the developed phase change material can be beneficially utilized in thermal storage systems.

Numerical simulation of controlled precision cryosurgery using argon Joule–Thomson and liquid nitrogen evaporation cryoprobes

Cryoablation is the most commonly used type of cryosurgery. Today, this treatment is insufficiently automated and therefore less accurate than alternative technologies that significantly limits and gradually reduces the scope of its application. However, from low temperature engineering point of view cryosurgery has the untapped potential of the improving its accuracy. In this paper three major methodological problems of cryosurgical equipment and procedure improving are considered: the impact on target isotherm location (1) of the soft biotissue moisture content solidification latent heat variation, (2) of the cryoprobe constructions and operating at maximum cooling power including the fluid cryogen features and the accuracy of boundary condition replacing a cryoprobe and (3) target isotherm fixation approach by modifying the cryoprobe operating mode. The numerical results showed that the target isotherm location depends insignificantly on different moisture content of soft biotissue, then it is not a limiting factor for cryoexposure prediction. Also numerical results showed that the theoretically minimum temperature of cryoprobe surface significantly overestimates their movement, this leads to a significant difference between the experimental and simulation results. The typical shape and movement of cryonecrosis isotherm at refined maximum cryoprobe cooling power for two typical constructions of cryoprobes and two cryogens are presented. The novel algorithm of modifying the cryoprobe operation mode for controlled precision cryosurgery is proposed and validated. All this complements the previously obtained data and shows the prospects for performing precision cryosurgery. The total average uncertainty of target isotherm location during the studied preliminary predicting stage of temperature field movement (virtual cryoablation) is estimated no more than ±0.41 mm. This information is expected to be useful for improving the quality of cryosurgery planning algorithms (e.g. for tumor treatment).

The effect of pulsed laser welding on hot cracking susceptible region size and weld pool internal geometry of Inconel 718: Numerical and experimental approaches

A 3D finite-element thermal model has been developed to estimate weld geometry and analyze thermal gradients and cooling rates in pulsed laser welding of Inconel 718 superalloy. Since Inconel 718 superalloy is sensitive to hot cracking, the extent of hot crack sensitive areas including heat affected zone, mushy zone and partially melted zone is very important in the investigation of weldability for this alloy. Because the welding process is very fast and the welding width is very thin, the numerical modeling approach can be very helpful to overcome the difficulties and limitations of experimental procedure. In this study, a finite element model is presented to simulate the process of pulsed laser welding of Inconel 718 and to predict the temperature distribution and shape of the weld pool and finally to estimate the extent of the hot cracking sensitive regions. Heat source was modeled by the combination of conical Gaussian and ellipsoid Goldak. Then, the results of numerical model were compared to the experimental results at preheat temperatures of 308, 393, 473 Kelvin. The proposed numerical model exhibits good agreements with the experimental results including the internal and external weld pool geometries and the extent of the hot cracking susceptible regions. Furthermore, detailed pulsed temperature distribution and thermal cycle containing solidification latent heat are obtained. Accordingly, this pulsed temperature history is correlated to the internal and external geometry of pulsed solidified weld pool.

Thermal reliability of organic-organic phase change materials and their shape-stabilized composites

Thermal reliability is one of the main concerns when using shape-stabilized phase change materials (SS-PCMs) composites in latent heat thermal energy storage (TES) systems operating in moderate to low temperature range. Thus, this paper presents a study of the thermal stability, chemical stability, and thermal properties of three binary eutectic mixtures of fatty acids: capric/myristic acid (CA/MA), lauric/myristic acid (LA/MA), and palmitic/stearic acid (PA/SA); as well of three SS-PCMs produced with a natural porous support: SS-CA/MA, SS-LA/MA and SS-PA/SA. The eutectics and the SS-PCMs were exposed to several heating/cooling cycles and then infrared spectroscopy was carried out to determine chemical changes. Moreover, phase change temperature, latent heat of fusion, and latent heat of solidification were measured by differential scanning calorimetry. The eutectics and composites were proven to present good thermal reliability over 100 cycles for CA/MA and SS-CA/MA, and up to 10000 cycles for LA/MA, PA/SA, SS-LA/MA and SS-PA/SA. The melting temperatures for the composites were between 19.5°C and 53.2°C, and enthalpies between 38 J/g and 49 J/g, with maximum deviation after thermal cycling below 2.03°C and 11.45 J/g. These results confirm that these materials have significant potential to be used for thermal energy storage applications that required good thermal reliability.

Improved thermal conductivity and stability of Na2SO4⋅10H2O PCMs system by incorporation of Al/C hybrid nanoparticles

Low thermal conductivity is a bottleneck for phase change materials (PCMs), which attracts much attention of the researchers. In this paper, a novel addition agent composed of Al nanoparticle and coated C (Al/C hybrid nanoparticles) was developed to improve the thermal conductivity of sodium sulfate decahydrate (Na2SO4⋅10H2O) PCMs. The Al/C hybrid nanoparticles exhibited thorn ball-like structure, in which hydrothermally generated C was well coated on the surface of Al particle to form a spiny spherical outer coating. Adding ~3 wt% Al/C hybrid nanoparticles caused 26.41% increment to the thermal conductivity (at 30 °C) and 5.13% reduction to the solidification latent heat enthalpy, which can be an effective way to improve the thermal conductivity and solidification latent heat enthalpy of the PCMs. Furthermore, the incorporation of Al/C nanoparticles improved the stability of the PCM system.

Analysis of the Thermal Transfers in a VASM Crucible: Electron Beam Melting Experiment and Numerical Simulation

A description of the Vacuum Arc Skull Melting (VASM) process is presented showing its particularly complex features because of the mixing of porous raw materials with the dense remelted metal as well as the very high temperature and the highly transient nature of the process. This paper presents a 3D transient mathematical modelling of the heat transport with the aim of bringing a better understanding of the thermal behavior of the material into the crucible during a melting cycle. The model takes into account the heat input provided by the incoming metal thanks to an adaptive meshing, as well as the latent heat of solidification and the radiative heat transfers. An experimental validation of the model is presented where an electron beam heating source mimics the heat effect of the arc thanks to an excellent guidance of the beam over the melt surface. A comparison between the measured and calculated temperatures of a steel load is reported and reveals a satisfactory agreement. With very few adjustments, concerning mainly heat radiation at the top surface of metal into the crucible, the numerical model appears to be an efficient numerical tool to simulate the VASM process at the industrial scale.

Numerical Simulation of Latent Heat of Solidification for Low Pressure Casting of Aluminum Alloy Wheels

In this paper, aiming at focusses on many problems existing in the mathematical model of temperature change in the low-pressure casting solidification process of aluminum alloy wheel hub, there is a big gap between the simulation and the actual temperature change, which affects the research on the solidification defects of the wheel hub. In order to study the solidification behavior of aluminum alloy hub in low-pressure casting process, the mathematical model describing the temperature change in the process of casting solidification is established by using different solidification latent heat methods. through finite element simulation and experiment, the temperature change in the process of aluminum alloy (A356) solidification is obtained to compare the difference between the temperature change described by different mathematical models, simulation and experiment. The results show that the temperature numerical model of "the temperature compensation heat capacity method" proposed in this paper is most consistent with the simulation temperature change during the solidification process of the aluminum alloy wheel in the simulation mold, which lays a good theoretical foundation for the study of the low-pressure casting process of the aluminum alloy wheel hub.

Effects of acid leaching and organic intercalation on the thermophysical properties of paraffin/expanded vermiculite composite phase change materials

In this study, original expanded vermiculite (EVM) was treated by acid leaching and organic intercalation to obtain modified EVM (A-EVM and A-O-EVM). Then, with nano Al2O3 powder as the thermal conductivity filler, a series of paraffin(P)/EVM-based shape-stable composite phase change materials (P/EVM, P/A-EVM, P/A-O-EVM and P-Al2O3/A-O-EVM ss-CPCMs) were prepared by the physical impregnation method. DSC results showed that the latent heat of P/EVM was 109.3 J/g. The three modified EVM-based ss-CPCMs had the higher latent heat (> 130 J/g), indicating that two kinds of modification treatments could significantly enhance the heat storage capacity. Moreover, the crystallization ability of paraffin in P-Al2O3/A-O-EVM was significantly enhanced (solidification latent heat > melting latent heat, HS > HM) compared with the ss-CPCMs (HS < HM) without organic intercalation. It was proved that improving the organic affinity and providing abundant nucleation sites were beneficial to reduce the inhibition effect of EVM matrix on the phase change behavior of paraffin during the solidification process. The results of TGA and thermal conductivity tests exhibited that P-Al2O3/A-O-EVM possessed high thermal stability and acceptable thermal conductivity (0.43 W/m·K). The thermal cycling measurement results still showed the satisfactory thermal reliability and chemical stability after 100 melting/freezing cycles. Therefore, P-Al2O3/A-O-EVM with good thermophysical properties was a promising energy storage material.