High Temperature Phase Change Research Articles

Research on NaCl-KCl High-Temperature Thermal Storage Composite Phase Change Material Based on Modified Blast Furnace Slag

The high-temperature composite phase change materials (HCPCMs) were prepared from solid waste blast furnace slag (BFS) and NaCl-KCl binary eutectic salt to achieve efficient and cost-effective utilization. To ensure good chemical compatibility with chlorine salt, modifier fly ash (FA) was incorporated and subjected to high-temperature treatment for the processing of industrial solid waste BFS, which possesses a complex chemical composition. The HCPCMs were synthesized through a three-step process involving static melting, solid waste modification, and mixing–cold pressing–sintering. Then, the influence of the modification method and the amount of SiC thermal conductivity reinforced material on chemical compatibility and thermodynamic performance was explored. The results demonstrate that the predominant phase of the modified solid waste is Ca2Al2SiO7, which exhibits excellent chemical compatibility with chlorine salt. HCPCMs containing less than 50 wt.% chloride content exhibit good morphological stability without any cracks, with a melting temperature of 661.76 °C and an enthalpy value of 108.73 J/g. Even after undergoing 60 thermal cycles, they maintain good chemical compatibility, with leakage rates for melting and solidification enthalpies being only 6.3% and 0.23%, respectively. The equilibrium was achieved when 40 wt.% of chloride salt was encapsulated upon the addition of 10% of SiC, and the incorporation of SiC resulted in an enhancement of thermal conductivity for HCPCMs to 2.959 W/(m·K) at room temperature and 2.400 W/(m·K) at 200 °C, with an average increase of about 2 times. The cost of the prepared HCPCMs experienced a significant reduction of 81.3%, demonstrating favorable economic performance and promising prospects for application. The research findings presented in this article can offer significant insights into the efficient utilization of solid waste.

High-temperature oxidation characteristics of 20CrMnTi electroplated with copper

During high-temperature forming and phase change heat treatment, the steel surface is susceptible to oxidation. This can negatively affect the surface quality of steel parts. The production of antioxidant coatings on the surface of steel parts is important for high-temperature precision forming and heat treatment. In this paper, the high-temperature oxidation tests of 20CrMnTi steel, copper, and 20CrMnTi electroplated with copper are conducted. The 20CrMnTi samples showed varying degrees of mass gain above 900 °C; the copper samples showed varying degrees of mass gain above 700 °C; and the process of mass gain for copper-plated 20CrMnTi followed the same trend as for copper during heating and holding. For heated samples of 20CrMnTi plated with copper, the copper coating was oxidized and residual copper was observed in the oxide layer. The distance between the residual copper and the surface of the sample is greater than between the residual copper and the junction of the plating layer and the substrate. Oxygen diffuses through internal defects in the material at a higher rate than copper oxidation. In this study, an oxygen diffusion model and an antioxidant protective layer model at high temperatures were suggested. The protective layer against oxidation recommended in this research is a dense coating consisting of single crystals or fine grains free of porosities and cracks.

Preparation and thermal conductivity enhancement of binary non-eutectic phase change materials based on alum-urea for solar heat storage system

Heat accumulators using latent heat storage are commonly used in solar energy storage systems. Potassium aluminum sulfate dodecahydrate (Alum) is an inexpensive phase change material, but the high phase change temperature limits its application in heat accumulator. To address this limitation is controlling the melting temperature of Alum. In this study, Alum-urea mixtures were first developed by adding 10 wt% urea. Modified phase change materials (MPCM) without phase separation and supercooling were developed by adding NiSO4·6H2O and xanthan gum to the Alum-urea mixture. Composite phase change materials (CPCM) with high thermal conductivity were developed by loading MPCM in expanded graphite. The melting temperature of the Alum-urea mixture was 72.52 °C with 10 wt% urea content, which was 21.4% lower compared to the Alum. The MPCM still has a high phase change enthalpy (157.7 J·g−1) and ignorable subcooling degree (0.8 °C). The thermal conductivity of CPCM is increased by 16 times, and it has good photothermal conversion ability. The CPCM holds significant promise for applications in latent heat energy storage.

Disodium hydrogen phosphate dodecahydrate/fumed silica composites with high latent heat and suitable phase change temperature for use in building roof

Introducing phase change materials (PCM) with suitable phase change temperature and large latent heat into the application of building roofs is conducive to building energy efficiency, which can reduce indoor temperature fluctuation and improve thermal comfort. In this paper, the optimized disodium hydrogen phosphate dodecahydrate (DHPD) was combined with fumed silica (FS) to prepare a new type of DHPD/FS composites, with a phase change temperature of 41.5 °C, a latent heat of change of 103.46 J/g, and an optimal content of 22.5 % of FS. The leakage experiments proved that there was no leakage of the PCM at this ratio, and after 200 cycles of thermal cycling, the phase change temperature of DHPD/FS composites basically remains unchanged, with good thermal reliability, but the addition of FS will make the material decrease in thermal conductivity, and the thermal conductivity is reduced to 0.19 W·m−1·K−1. Furthermore, the study investigated the application of the encapsulated DHPD/FS composites as a phase change board on the roof. The results indicated that the inclusion of the phase change board improved indoor thermal comfort and demonstrated good thermal performance. When the phase change board was positioned in the top layer, the enhancement of thermal comfort was most optimal.

Microencapsulation of Al-Si-Fe alloys for high-temperature thermal storage with excellent thermal cycling performance

Metal-based phase change heat storage materials have become a potent candidate to regulate supply and demand of thermal energy due to their high conductivity, latent heat and stability. With the development of high-efficiency energy storage systems, materials with higher phase change temperatures are in demand urgently for more effective energy storage, which had not been achieved. Herein, the industrial Al-Si-Fe alloy with phase change temperature of 869 °C was chosen as heat storage material in this research. Furthermore, to prevent the alloy from the inherent problems such as liquid leakage, oxidation and corrosion at high temperature, a new and simple strategy was developed to micro-capsulate the alloy. The prepared process of microcapsules involved two steps: pre-coated of aluminum hydroxide along with hydrothermal carbon and heat treatment in nitrogen atmosphere. The composition, morphology, and thermal performance of the microcapsules were characterized by XRD, SEM, TEM, and TG-DSC. The results indicated the shell below 1 μm was composed of α-Al2O3 strengthened by network AlN fibers formed through the V-S mechanism. The latent heat of microcapsules reached 187.6 J·g−1 which was 82.9 % relative to raw material. Moreover, the total latent heat of the microcapsules did not change much after 300 cycles between 500 and 900 °C, although the phase transition behavior was altered. Overall, this research provides a novel idea for the encapsulation technology and the application of thermal energy storage materials from preparation and structure, which is conducive to promote the application of high-temperature phase change materials.

Preparation and Photothermal Properties of Accordion‐Like MXene/Sodium Acetate Trihydrate Composite Phase Change Materials

Phase change materials (PCMs) are promising options for thermal energy storage. Combining sodium acetate trihydrate (SAT) with MXene, the composite phase change materials (CPCMs) have been prepared. The surface morphology, thermal storage performance, and solar energy photothermal conversion efficiency of the CPCMs with various MXene contents are analyzed. According to the microstructure morphology analysis, MXene is accordion‐shaped, and tightly associated with SAT. Differential scanning calorimetry measurement results show that CPCMs possess high latent heat and suitable phase change temperature for the applications of solar heat storage. The absorption wavelength range of SAT/MXene is extended from 200–258 nm to 200–497.7 nm with a photothermal conversion efficiency of 81.3%. SAT/MXene‐2%, SAT/MXene‐8%, and SAT/MXene‐14% have thermal conductivities of 0.84, 1.14, and 1.47 W/ (m · K), respectively, which are higher by 44.9%, 96.6%, and 153.4% than 0.59 W/ (m · K) of pure SAT. CPCMs exhibit excellent thermal stability and reliable cycling stability after 50 cycles, which show that MXene can prevent leakage during the solid‐liquid phase transition process. The expansion of PCM's practical applicability and MXene/SAT composites with good photothermal characteristics create a theoretical foundation for the effective use of renewable energy sources.

Characterization of novel lamellar porous Ti3SiC2 as shape-stabilized high-temperature phase change materials composites for durable enhancement thermal storage properties

In pursuit of leveraging porous media for high-temperature phase change materials (PCMs) to enhance the overall thermal conductivity and encapsulation performance of PCMs, this study delves into the corrosion behavior of Ti3SiC2 with a lamellar porous structure in different corrosive environments at both high and low temperatures. By manipulating the solid content to modify the porous structure, the investigation probes the corrosion phenomena and anti-corrosion mechanisms across various porous configurations. The results reveal that F ions exert the most extensive structural degradation on Ti3SiC2. Based on these insights, a successful fabrication of a molten salt phase change composite material, Ti3SiC2/KCl-NaCl, boasting a lamellar structure was achieved. With an increase in solid content, the thermal conductivity escalates from 6.13 to 9.27 W/(m∙K), tripling the heat conductivity of pure KCl-NaCl. However, this also leads to a reduction in latent heat from 126.7 J/g to 46.2 J/g. Consequently, the phase change energy storage performance of PCM prepared by sample 2 emerges as exceptionally commendable. Following 200 thermal cycles on the composite PCM, no discernible structural damage was observed, albeit a slight performance decline. Hence, the lamellar Ti3SiC2/KCl-NaCl structure not only boasts favorable phase change energy storage capabilities but also demonstrates an extended service life.

High-entropy Ti-Zr-Hf-Ni-Cu alloys as solid-solid phase change materials for high-temperature thermal energy storage

High-performance high-temperature solid-solid phase change materials (SS-PCMs) are urgently demanded for thermal energy storage and thermal management at elevated temperatures in the rapidly developing energy and information industries. Here, we report a novel class of Ti-Zr-Hf-Ni-Cu high-entropy alloys showing high thermal-energy-storage performance at elevated temperatures, which are a robust candidate for high-temperature SS-PCMs. Notably, the figure-of-merit values of these Ti-Zr-Hf-Ni-Cu SS-PCMs are an order of magnitude higher than that of traditional SS-PCMs, due to their much higher thermal conductivity and satisfactory volumetric energy storage capacity as compared to traditional SS-PCMs. Furthermore, the phase transition temperatures of these SS-PCMs can be easily and precisely tuned by composition change, in a wide high-temperature range of 300–470 °C. These high figure-of-merit SS-PCMs with high thermal conductivity have extremely promising prospects for advanced thermal energy storage and compact high-power-density electronic cooling applications. This work opens a new field for exploring high-entropy alloys as solid-solid thermal-energy-storage phase change materials.

Performance investigation and optimization of latent heat exchanger with pin fins based on non-uniform deployment strategy

Latent heat storage technology is an essential way of efficiently utilizing industrial residual heat, which helps to the objective of carbon neutrality in all countries. In this work, latent heat exchangers with pin fins are numerically investigated based on non-uniform deployment strategy and then optimized according to response surface method. The influences of rotation angle, non-uniform fin pitch, non-uniform fin length and combination of phase change materials with different melting temperatures on thermal storage performance are studied. Results show that the increment of rotation angle facilitates the reduction of complete melting time, and the optimal angle accelerates the melting speed by 10.3% compared to the 0° angle. The arrangements of gradually decreasing fin pitch and gradually increasing fin length along flow direction of heat transfer fluid improve the heat storage performance, which can reduce the complete melting time by 7.3% and 22.2% respectively, compared to the uniform arrangement. The multiple phase change materials latent heat exchanger with high melting temperature phase change material placed in high temperature region and low melting temperature phase change material in low temperature region can make better utilization of heat from heat transfer fluid, which can improve the melting speed by 16.8% compared with the single phase change material latent heat exchanger. The optimized latent heat exchanger based on response surface method reduces the complete melting time by 23.4% compared to the original model. In conclusion, the heat storage performance of latent heat exchanger with pin fins effectively improved by adopting the non-uniform deployment strategy.

Composite phase change materials with thermal-flexible and efficient photothermal conversion properties for solar thermal management

Composite phase change material (CPCM) with the advantages of high enthalpy and constant temperature phase change, has been widely used in many fields, such as photovoltaic thermal system, building envelope structure and so on. However, conventional CPCM is often rigid, poor light absorption and low thermal conductivity, which limits the application of solar energy utilization. In this paper, a novel Paraffin wax/Thermoplastic elastomer/Carbon nanotube(PA/SEBS/CNT) with shape stability, thermos-flexibility and high photothermal conversion efficiency was prepared, PA as the phase change material, SEBS as the flexible material and CNT as the light-absorbing material. The results show that the addition of CNT increases the absorbance of PA/SEBS from 0.3 to 1.0, and the photothermal conversion efficiency of PA/SEBS/CNT-10 % is as high as 96.17 %. In addition, the CPCM also has a high enthalpy value of 180 J/g, and a high thermal conductivity of >0.3403 W/(m·K), and also exhibits shape-driven memory. At the same time, outdoor photothermal experiments show that PA/SEBS/CNT has excellent photothermal conversion performance under real sunlight, and the highest temperature can reach 99.51 °C. The new CPCM developed has a broad application prospect in solar thermal systems.

Combined passive enhancement techniques improve the thermal performance of latent heat storage system: A design anomaly?

Poor heat transfer rate due to low thermal conductivity of phase change material limits the wide application of latent heat storage (LHS) systems. Thermal performance enhancement techniques can be potential methods to address this major limitation of LHS systems. In this context, the present numerical study examines the individual and cumulative impact of two passive heat transfer enhancement techniques (the orientation of the domain and position of the heat transfer fluid (HTF) tube) on the thermal performance of the latent heat storage (LHS) system consisting of high-temperature (HT) phase change medium (PCM). The individual effect of orientation decreases the charging duration of θ = 0° (horizontal configuration) by 10.5 %, 15 %, and 19.04 % than θ = 30°, θ = 60° and θ = 90° (vertical configuration), respectively. However, the discharging duration remains unchanged for all inclinations (11.5–12 h). The individual effect of eccentricity decreases the charging duration of horizontal (θ = 0⁰, ey = −5 mm,-10 mm,-20 mm) system by 6.25 %,12.8 %, and 18.75 % than concentric horizontal (θ = 0°, ex = ey = 0) system. Moreover, the combined effect of orientation and eccentricity (θ = 0⁰,ey = −5 mm,-10 mm,-20 mm) reduces charging duration by 28.75 %, 33.33 %, and 38.1 % than vertical concentric domain (θ = 90°, ex = ey = 0), respectively. However, eccentricity in vertically upward and downward directions increases the discharging duration compared to the concentric domain. Hence, the combined effect results in a design anomaly for HT-LHS system. The charging and discharging performances are observed to be predominantly sensitive to the Rayleigh number than the Reynolds number.

Biomimetic design of flexible wood film combined with thermochromism and self-luminescence for enhanced energy-saving

In this research, the layered bionic wood films were designed and constructed inspired by the “reinforced concrete”-like chemical structure of wood combined with the macrostructure of bark and phloem. Specifically, a simple strategy for immobilizing diol eutectic phase change components with intelligent discoloration/chromogenic leaching in wood by using delignification wood (DE) with capillary penetration was adopted. The “reinforced concrete” structure solves the problem of easy leakage and weak strength due to strong molecular bonding. The bionic wood film has a high phase change enthalpy (155.5 J/g) and suitable phase change temperature (29.9 °C). On this basis, combined with PVA/glycerol as a flexible matrix as the inner bark of wood and phloem connecting each layer, combined with PVA/glycerol/PLO-8C as a key self-luminescent energy-enriched material as the outer bark of wood, the flexible and self-luminescent energy-saving wood films were reconstructed in a biomimetic way with a high mechanical strength (65.53 MPa). Through the change of color, the phase transition process and the current ambient temperature can be intuitively judged. The surface morphology and luminescence intensity were also not affected after 50 cycles of absorption and luminescence. This study provides a broader development direction for the application of intelligent enhanced energy enrichment of PCM-based on bionic wood construction.

Experimental and numerical investigation of the melting process of solar salt in a spherical capsule

Solar salt is commonly employed as phase change material in various industrial applications, particularly in latent heat-based thermal storage systems such as packed beds in solar thermal power technologies. Here, a series of experimental and numerical studies are conducted of the melting process of a binary nitrate salt inside a spherical capsule under a wide range of large Stefan numbers, specifically ranging from 0.56 to 1.12. For a deep understanding of the melting behavior inside the sphere and its heat transfer characteristics under different constant wall temperatures and sphere sizes, the visualized high-temperature phase change experiment along with a 2D axisymmetric numerical model are presented. To confirm modelling reliability, the numerical model well-realized the sinking phenomena visualized in the experiment with a suitable mushy-zone parameter value of 6*108 kg/(m3·s). Subsequently, the temperature field, flow field, melting front, total transfer rate and melting time are explored. Further, a detailed parametric investigation is applied, including the effects of dimensionless parameters such as Gr, Ste on the melting process. And finally, the dimensionless correlation is succeeded to be proposed for unconstrained melting process with 0.56 ≤ Ste ≤ 1.12 and 1.80E+04 ≤ Gr ≤ 2.02E+05.

Experimental analysis of a power-to-heat storage with high-temperature phase change materials to increase flexibility and sector coupling

To boost the flexibility, sector coupling and manageability of renewable energy systems, a unique power-to-heat storage (electric charging, thermal discharging) is proposed. The hybrid thermal energy storage system, including phase change materials, is built using flat pillow-plates and heating rods. Experimental testing is conducted to assess the prototype's electrical and thermal performance. In addition, a parametric study involving several charging and discharging control strategies is proposed in this context.The suggested hybrid thermal storage system provides a total storage capacity of 4.87kWh using nitrate salts as phase-change material (eutectic mixture of KNO3 and NaNO3). The charging efficiency ranges from 65 to 90%, depending on the charging/discharging strategy, and the discharging period can be shortened by more than 1 h. Additionally, active management of the heating rod temperature reduces the charging period by half, making the storage system highly flexible. This demonstrates the ability of this system to aid in modularity and flexibility for effective energy management in the context of renewable energy and industry thanks to an increased storage capacity.

Soft-hard complex microsphere strategy to construct high-temperature form-stable phase change material for melt-spun temperature-regulating fibers

Phase change materials (PCMs) have excellent temperature regulation ability and are usually used in smart wearable devices. However, PCMs prepared by traditional methods cannot be applied to high-temperature (>230 °C) melt spinning, and leakage of PCM is prone to occur during spinning. This work successfully prepared a series of PCMs with high thermal form-stable by the strategy of capillary adsorption of inorganic porous materials and surface microchemical crosslinking and proved that it can effectively solve the above-mentioned problems of high-temperature melt-spinning temperature regulating fibers. This PCM prepared by combining porous SiO2 adsorption and chemical crosslinking of polyethylene glycol derivatives exhibits excellent heat resistance at 130 °C for 40 min. In addition, polycaprolactam (PA6) was selected as the polymer matrix, and PA6-based temperature regulating fibers with excellent temperature regulating functions were prepared. The thermal response time of the fabric prepared from this fiber in the hot environment is 782 s, and the maximum temperature difference is 5.4 °C. Moreover, the exothermic duration in cold environment is 427 s, and the maximum temperature difference is 2.3 °C. This shows that the prepared temperature regulating fiber has good application prospect in heat-regulating devices.

Thermal analysis of phase change materials storage in solar concenter

Thermal analysis of high-temperature phase change materials (PCM) is conducted with the consideration of a 20% void and buoyancy-driven convection in a stainless-steel capsule. The effects of the thermal expansion and the volume expansion due to phase change on the energy storage and retrieval process are explored. The used water to fill the void between two different wax paraffin and stearic acid spheres is considered as a potential PCM for concentrated solar power. The charging/discharging process into and from the capsule wall is simulated under different boundary conditions for laminar and turbulent flows. Computational models are conducted by applying an enthalpy-porosity method and volume of fluid method to calculate the transport phenomena within the PCM capsule, including an internal air void. A simplified two-dimensional model of the PCM contained within the spheres is constructed and thermal analyses are performed for the transition from solid to liquid states. Simulated charging process modes are compared with the theory. According to experiments, the temperature distributions from 40-60 mm without and with 60 mm with copper fin have different behavior. The paraffin takes less time than stearic acid for total transformation at a rate of 0.5. The size of the sphere increases over the amount of time and the phase of the sphere to complete changes as stearic acid expands more than paraffin during the transition. Inserting a rectangular fin, that is made from copper into the ball reduces the cycle time and increases output.

Graphite crucible interaction with Fe–Si–B phase change material in pilot-scale experiments

Abstract Fe–26Si–9B alloy is a promising high temperature phase change material (HTPCM), due to its high heat of fusion, small volumetric change, abundance, and low cost. Additionally, graphite has been identified as a promising candidate for use as a container material for this alloy. In this study, the feasibility of using graphite for Fe–26Si–9B HTPCM is investigated in a pilot-scale. Specifically, 4–5 kg Fe–26Si–9B master alloys were melted in graphite crucibles using an induction furnace, which underwent 2–3 thermal cycles in the temperature range of 1,100–1,375°C. The results showed that SiC and B4C precipitates were formed in the alloys. However, these carbides were found to be present only on the surface of the solidified alloys and not in the main body. Still, the chemical composition of the Fe–26Si–9B alloy remained relatively stable during the thermal cycles. It was also seen that the graphite crucible withstood the temperature cycles without cracking. Therefore, the use of graphite as a container for Fe–26Si–9B phase change material is a promising approach.

Near zero thermal performance loss of Al-Si microcapsules with fibers network embedded Al2O3/AlN shell

Al-Si alloy, a high temperature phase change material, has great potential in thermal management due to its advantages of high heat storage density and thermal conductivity. Microencapsulation of Al-Si alloy is one of the effective techniques to solve high temperature leakage and corrosion. In this paper, commercial Al-10Si alloy micro powders were encapsulated with flexible ceramic shells whose total thickness is below 1 µm by hydrothermal treatment and heat treatment in N2 atmosphere. The compositions and microstructures were characterized by XRD, SEM and TEM. The shell was composed of AlN fibers network structure embedded with α-Al2O3/AlN which prevented the alloy from leaking and oxidizing, as well as had excellent thermal stability. The latent heat of microcapsules was 351.8 J g–1 for absorption and 372.7 J g–1 for exothermic. The microcapsules showed near zero thermal performance loss with latent heat storage (LHS)/ release (LHR) was 353.2/ 403.7 J g–1 after 3000 cycles. Compared with the published Al-Si alloy microcapsules, both high heat storage density and super thermal cycle stability were achieved, showing promising development prospects in high temperature thermal management.

Temperature-sensitive and self-healing shape-stable phase change materials containing temperature adjustable ionic liquid for improving the recycling stability and the applicability in cold energy storage

Advanced shape-stable phase change materials (SSPCMs) with environment self-adaptation are becoming more meaningful in regulating temperature in diverse applications. In this manuscript, a series of self-healing SSPCMs containing ionic liquids were fabricated by temperature-responsive polymers (PNIPAM) through the free radical polymerization method. 1-ethyl-3-methylimidazolium dicyanamide ([Emim][DCA]) ionic liquid was selected as the cooling agent and PCM. 2-ureido-4[1H]-pyrimidinone (UPy) and chitosan oligosaccharide (COS) were chosen as modifiers. Nuclear magnetic resonance (NMR) and Fourier transform infrared (FTIR) spectroscopy were used to determine the chemical structure. The surface morphology of SSPCMs was observed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and polarizing optical microscopy (POM). A rotational rheometer and electronic universal testing machine were used to assess the self-healing effectiveness and mechanical properties of SSPCMs. Thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC) were used to examine the thermal characteristics and thermal reliabilities of self-healing SSPCMs. The results indicate that the self-healing efficiency of SSPCM is 91.04 % within 5 min, and compressive strength is improved by 65.7 % by the ionic liquid. The SSPCMs perform thermo-sensitive properties, which allow SSPCMs to maintain a stable shape in response to temperature change and reduce PCMs leakage. Furthermore, the SSPCMs can quickly and effectively recover their mechanical properties after damage thanks to the excellent self-healing properties. Meanwhile, the SSPCMs have a longer lifespan for improving recycling efficiency and are more environmentally friendly. The developed SSPCMs with recycle stability have a high energy density (251.5 J/g) and adjustable phase change temperature properties. The developed SSPCMs can be made to fit various temperature applications by changing the concentration of ionic liquids in the phase change system. Overall, the SSPCMs show promising potential for cold energy storage and thermal management.

Improving thermal performance of a passive ventilation and cooling system by integrating a phase-change material: Dynamic characteristics and parametric examinations

The coupling of a solar chimney (SC) with an earth–air heat exchanger (EAHE) is a passive ventilation and cooling system that provides fresh air and cooling to buildings. However, inherent disadvantages of the coupled system include the mismatch of the induced airflow rate and internal cooling load and the low nighttime ventilation rate, which limit the full utilization of the coupled system. These issues can be mitigated by integrating a phase-change material (PCM) in the system of SC combined with EAHE (SCEAHE). Parametric investigations were conducted to examine the thermal performance improvement of the PCM-based SCEAHE system using a dynamic model. The numerical data revealed that solar energy was effectively extracted and reallocated by the PCM, thereby increasing the nighttime airflow rate and reducing the indoor air temperature. The phase-change temperature of the PCM not only affected the airflow rate but also the thermal environment at night and in the early morning. Therefore, a PCM with a higher phase-change temperature is recommended in this study. The latent heat of fusion had a larger impact on the induced ventilation rate than the outlet air temperature of the EAHE when the latent heat of fusion exceeded 175 kJ/kg. In addition, a PCM with a thermal conductivity <1 W/(m·K) is suggested. In practical application, a thickness range of 0.04–0.05 m is the most suitable. The specific heat of the PCM had slight influence on the thermal performance of the proposed system.