Enhancement of heat transfer in phase change material using graphite-paraffin composites

Sathiyaraj., R; Rakesh, R.; Mithran, N.; Venkatesan, M.

doi:10.1051/matecconf/201817202001

Cited by 3 publications

(2 citation statements)

References 9 publications

(9 reference statements)

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“…Notably, the PCM C -10%GP composite demonstrated a narrower phase transition temperature range in comparison to both the PCM C (0%GP) and PCM C -20%GP composites. This reduced range signifies the effectiveness of incorporating graphite powder into the PCM, specifically emphasizing the optimal ratio for reducing the heat absorption and heat release time of the PCM [40]. Especially during the endothermic process, the PCM C -10%GP composite exhibited a 35.94% lower melting time in comparison to plain PCM.…”

Section: Thermal Analysis Of the Pcm-gp Compositesmentioning

confidence: 99%

Enhancing Thermal Efficiency through the Use of Graphite-Infused Phase Change Materials in Roof Structures to Reduce Building Cooling Demand

Mano,

Fazlizan,

Thongtha

2023

Buildings

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This research focuses on the thermal properties of three distinctive paraffin waxes—PCMA, PCMB, and PCMC—each characterized by a specific melting point. The crucial phase transition temperature intervals and latent heat values were examined using differential scanning calorimetry (DSC) in the temperature range of 0 °C to 80 °C. These parameters are pivotal for the effective application of these phase change materials (PCMs) in building envelopes, influencing the overall heat storage performance. The study delved into the development and encapsulation of blends containing both the phase change material (PCM) and graphite. This involves combining the chosen PCM with graphite powder and examining the weight ratios of 10% and 20%. The thermal characteristics of these blends revealed that a 10% ratio of graphite powder proved effective in improving the PCM with graphite. This resulted in a reduced range of melting and solidification temperatures while maintaining the essential chemical structure of the PCM without additives. Furthermore, the practical application of PCM–graphite composites within a building’s envelope was explored, revealing a substantial reduction in heat transfer from the exterior to the interior of the building. This underscores the potential for energy-efficient building designs.

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Section: Thermal Analysis Of the Pcm-gp Compositesmentioning

confidence: 99%

Enhancing Thermal Efficiency through the Use of Graphite-Infused Phase Change Materials in Roof Structures to Reduce Building Cooling Demand

Mano,

Fazlizan,

Thongtha

2023

Buildings

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“…The efficiency of the collector was improved with paraffin wax and Nano-composite by (6.9% and 8.4%), respectively. Sathiyaraj et al [16] experimentally improved the PCM thermal conductivity for thermal storage (use paraffin wax as PCM) by boosting it with graphite powder. The results showed that the paraffin/graphite powder compound had better performance in heat transfer due to the high thermal conductivity (300 to 550 W/mK).…”

Section: Introductionmentioning

confidence: 99%

Thermal Enhancement for Solar Water Heating System by Using Phase change Materials

Abdalaali¹,

Dakhil²,

Jabbar³

2022

Proceedings of 2nd International Multi-Disciplinary Conference Theme: Integrated Sciences and Technologies, IMDC-IST 2021, 7-9

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Thermal storage using phase-change materials PCMs is an efficient technique for enhancing the efficiency of solar energy utilization. This paper presents an investigation of solar thermal energy storage systems using an encapsulated PCM working in a realistic environment (Basra, Iraq). Numerical investigating the thermal performance of the heating system by using CFD technics with finite volume method .Water is used as the heat-transfer fluid HTF as well as sensible heat material. While paraffin wax packed in small cylindrical galvanized-iron capsules is used as the latent heat-PCM material. The capsules are integrated into a commercially cylindrical storage tank for hot water. First, the advantage of using flat plate solar collector FPSC and PCM is demonstrated on an insulated water tank. Finally, a turbulent-transient-3D model was developed using the ANSYS FLUENT 2020 R1 and compared with the experimental results. It was found in this case that the water temperature reaches above 50°C. Remained hot at least 25°C higher than the ambient temperature throughout 16 hours due to the presence of PCM. Parametric analyzes are performed to study the effect of the HTF flow rate (3 and 15lit/min) and the amount of PCM (5 and 10kg) on the PCM melting process, the charging time, and thermal storage energy of the water tank. The results indicate that the best performance can be obtained with the highest flow rate and the highest amount of PCM 15lit/min and 10kg, respectively, according to the current study. The results proved good agreement between the measured and numerical work.

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Study on Phase Change Materials’ Heat Transfer Characteristics of Medium Temperature Solar Energy Collection System

Wang,

Jin,

Alam

2024

Materials

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Within the next five years, renewable energy is expected to account for approximately 80% of the new global power generation capacity, with solar power contributing to more than half of this growth. However, the intermittent nature of solar energy remains a significant challenge to fully realizing its potential. Thus, efficient energy storage is crucial for optimizing the effectiveness and dependability of renewable energy. Phase-change materials (PCMs) can play an important role in solar energy storage due to their low cost and high volumetric energy storage density. The low thermal conductivity of PCMs restricts their use for energy storage, despite their immense potential. Hence, the primary goal of this study is to experimentally investigate the energy storage capacity of two blended phase-change materials (paraffin and barium hydroxide octahydrate) through integration with a medium-temperature solar heat collection system. The experimental findings reveal that the blended PCMs possess the highest cumulative charge fraction (0.59), energy capacity, and low energy loss compared to each PCM alone. Furthermore, the phase change storage tank achieves higher heat storage (27%) and exergy storage efficiency (18%) compared to the stored tank water without any PCMs. The blended PCMs enhanced their performance, exhibiting improved interaction and excellent thermal storage properties across a range of temperatures, offering an opportunity for the design of an energy-efficient, low-cost storage system.

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Enhancement of heat transfer in phase change material using graphite-paraffin composites

Cited by 3 publications

References 9 publications

Enhancing Thermal Efficiency through the Use of Graphite-Infused Phase Change Materials in Roof Structures to Reduce Building Cooling Demand

Enhancing Thermal Efficiency through the Use of Graphite-Infused Phase Change Materials in Roof Structures to Reduce Building Cooling Demand

Thermal Enhancement for Solar Water Heating System by Using Phase change Materials

Study on Phase Change Materials’ Heat Transfer Characteristics of Medium Temperature Solar Energy Collection System

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