Preparation and thermal energy storage behaviour of stearic acid–TiO2 nanofluids as a phase change material for solar heating systems

Harikrishnan, S.; Magesh, S.; Kalaiselvam, S.

doi:10.1016/j.tca.2013.05.001

Cited by 134 publications

(51 citation statements)

References 35 publications

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“…Compared to the base fluid, the melting time and solidification time of the mixture were reduced by 28.57 and 27.67% respectively, when the weight fraction of copper oxide nanoparticles was 2.0%. Another study from Harikrishnan et al [67] by suspending titania nanoparticles in stearic acid showed that the melting and solidification times of the mixture reduced by 7.03-43.72 and 6.62-41.39% respectively when the weight fraction of the nanoparticles varied from 0.05% to 0.3%, compared to the stearic acid base fluid.…”

Section: Nano-enhanced Pcms With Other Pcms As Base Fluidsmentioning

confidence: 99%

Nano-enhanced phase change materials for improved building performance

Lin

Sohel

2016

Renewable and Sustainable Energy Reviews

149

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Nano-enhanced phase change materials (PCMs) have attracted increasing attention to address one of the key barriers (i.e. low thermal conductivity) to the wide adoption of PCMs in many industrial applications. This paper discusses the generic problem and key issues associated with appropriately using this new class of materials in buildings for effective thermal management and improved energy performance. An overview on major recent development and application of nano-enhanced PCMs as thermal energy storage media is provided. A case study based on a PCM ceiling ventilation system integrated with solar photovoltaic thermal (PVT) collectors is then performed to evaluate the potential benefits due to the dispersion of copper nanoparticles into the PCM base fluid of RT24. The results showed that this nano-enhanced PCM has higher melting and solidification rates than that of the pure PCM. Compared to the use of the pure PCM, 8.3% more heat was charged in and 25.1% more heat was discharged from the nano-enhanced PCM under the three winter test days. More research is needed to understand the fundamental mechanisms behind the PCM thermal conductivity enhancement through the dispersion of nanometer-sized materials and to investigate how these mechanisms drive building performance enhancement. Abstract: Nano-enhanced phase change materials (PCMs) have attracted increasing attention to address one of the key barriers (i.e. low thermal conductivity) to the wide adoption of PCMs in many industrial applications. This paper discusses the generic problem and key issues associated with appropriately using this new class of materials in buildings for effective thermal management and improved energy performance. An overview on major recent development and application of nano-enhanced PCMs as thermal energy storage media is provided. A case study based on a PCM ceiling ventilation system integrated with solar photovoltaic thermal (PVT) collectors is then performed to evaluate the potential benefits due to the dispersion of copper nanoparticles into the PCM base fluid of RT24. The results showed that this nano-enhanced PCM has higher melting and solidification rates than that of the pure PCM. Compared to the use of the pure PCM, 8.3% more heat was charged in and 25.1% more heat was discharged from the nano-enhanced PCM under the three winter test days. More research is needed to understand the fundamental mechanisms behind the PCM thermal conductivity enhancement through the dispersion of nanometer-sized materials and to investigate how these mechanisms drive building performance enhancement.

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Section: Nano-enhanced Pcms With Other Pcms As Base Fluidsmentioning

confidence: 99%

Nano-enhanced phase change materials for improved building performance

Lin

Sohel

2016

Renewable and Sustainable Energy Reviews

149

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“…Several studies have used the two step method for the synthesis of nanofluids [13][14][15][16]. Some researchers have advocated that the two step method is advisable for the synthesis of oxide particles suspended in a nanofluid rather than metal particles suspended in a nanofluid [17].…”

Section: Nanofluid Synthesismentioning

confidence: 99%

Review on Synthesis, Thermo-Physical Property, and Heat Transfer Mechanism of Nanofluids

Patil

Seo²,

Kang

et al. 2016

Energies

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Nanofluids are suspended nano-sized particles in a base fluid. With increasing demand for more high efficiency thermal systems, nanofluids seem to be a promising option for researchers. As a result, numerous investigations have been undertaken to understand the behaviors of nanofluids. Since their discovery, the thermo-physical properties of nanofluids have been under intense research. Inadequate understanding of the mechanisms involved in the heat transfer of nanofluids has been the major obstacle for the development of sophisticated nanofluids with the desired properties. In this comprehensive review paper, investigations on synthesis, thermo-physical properties, and heat transfer mechanisms of nanofluids have been reviewed and presented. Results show that the thermal conductivity of nanofluids increases with the increase of the operating temperature. This can potentially be used for the efficiency enhancement of thermal systems under higher operating temperatures. In addition, this paper also provides details concerning dependency of the thermo-physical properties as well as synthesis and the heat transfer mechanism of the nanofluids.

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“…When nanoparticles are distributed throughout a PCM, they increase its thermal conductivity, resulting in a decrease of latent heat. Adding and deleting nanoparticles can increase or decrease thermal conductivity (Harikrishnan et al, 2013;Yu et al, 2013). An important parameter for improving the heat transfer of PCMs is the size and shape of these added nanoparticles (Özerinç et al, 2010).…”

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confidence: 99%

Thermal Properties of Beeswax/CuO Nano Phase-change Material Used for Thermal Energy Storage

Putra

Prawiro²,

Amin³

2016

IJTech

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Experimentation on and implementation of phase-change materials for thermal storage is attracting increasing attention by those seeking a potential resolution to energy issues. This study investigates beeswax as a high thermal-capacity phase-change material with the objective of analyzing the thermal properties and behaviors of beeswax/CuO nano-PCM. The study uses differential scanning calorimetry apparatus to measure the melting temperature and thermal capacity of nano-PCMs. The study found nano-PCM melting temperatures of 63.62°C, 63.59°C, 63.66°C, 63.19°C, and 62.45°C at 0.05, 0.1, 0.15, 0.2, and 0.25 wt%, respectively. FTIR testing found no chemical reaction between CuO and beeswax. The existence of CuO nanoparticles enhanced thermal conductivity of beeswax but reduced its heat capacity. However, the change in latent heat caused no significant effects in the performance of beeswax/CuO. Thus, the results showed that heat transfer of composite beeswax/CuO melts faster than base phase-change material.

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Preparation and thermal energy storage behaviour of stearic acid–TiO2 nanofluids as a phase change material for solar heating systems

Cited by 134 publications

References 35 publications

Nano-enhanced phase change materials for improved building performance

Nano-enhanced phase change materials for improved building performance

Review on Synthesis, Thermo-Physical Property, and Heat Transfer Mechanism of Nanofluids

Thermal Properties of Beeswax/CuO Nano Phase-change Material Used for Thermal Energy Storage

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