Role of PCM based nanofluids for energy efficient cool thermal storage system

Kumaresan, V.; Chandrasekaran, P.; Nanda, Maitreyee; Maini, Anil K.; Velraj, R.

doi:10.1016/j.ijrefrig.2013.04.010

Cited by 129 publications

(53 citation statements)

References 18 publications

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“…In one-step method, the material is prepared through simultaneously producing and dispersing nanometer-sized materials into the PCM base fluid [30,31], while in the two-step method, nanometer-sized materials are first produced and then dispersed into the PCM base fluid [31,32]. The two-step method is the most economic method to produce the materials in large scale and has been extensively used to prepare nano-enhanced PCMs [31,[33][34][35][36]. In this method, the ultrasonic vibration technique is usually used to ensure that nanometer-sized materials are well dispersed into the base fluid [33][34][35][36] and appropriate surfactants are used to enhance the stability of nanometer-sized materials in the PCM base fluid to maintain good suspension performance [33,36].…”

Section: Materials Preparationmentioning

confidence: 99%

“…Kumaresan et al [36] reported that 6-9% energy savings in a chiller integrated with a deionized water-based thermal energy storage system can be achieved for building cooling applications and thermal management of intermittently operated electronic devices, through dispersing multi-walled carbon nanotubes. Compared to the deionized water, the solidification time of the nano-enhanced PCM was reduced by 14.0~20.1% when the volume fraction of carbon nanotubes was 0.6%, depending on the surrounding bath temperature.…”

Section: Application Of Nano-enhanced Pcms In Buildingsmentioning

confidence: 99%

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Nano-enhanced phase change materials for improved building performance

Lin

Sohel

2016

Renewable and Sustainable Energy Reviews

169

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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: Materials Preparationmentioning

confidence: 99%

Section: Application Of Nano-enhanced Pcms In Buildingsmentioning

confidence: 99%

Nano-enhanced phase change materials for improved building performance

Lin

Sohel

2016

Renewable and Sustainable Energy Reviews

169

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“…As a derivative of graphene, graphene oxide nanosheet has become an attractive material and is expected to be a new kind of additive in nanofluids (Kumaresan V. et al, 2013;Khodadadi et al, 2013). In most published papers, additives contained in nanofluids are usually zero dimensional nanoparticles or one dimensional carbon nanotubes or nanowires (Chandrasekaran et al, 2014;Kumaresan et al, 2012;Shaikh et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Study on the supercooling degree and nucleation behavior of water-based graphene oxide nanofluids PCM

Liu

et al. 2015

International Journal of Refrigeration

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“…To avoid the aforementioned factors negatively affecting the nucleation rate and SD, researchers have proposed several methods such as adding nucleating agents or undissolved impurities [6][7][8][9][10][11][12], changing the size and shape of the PCMs [13][14][15], inputting external energy (mechanical and ultrasonic vibration) [16,17], increasing the thermal conductivity of the PCMs [18][19][20], reducing the kinematic viscosity of the PCM [20][21][22][23], encapsulating the PCMs [24], and using the porous structure and network of the PCM to enhance their energy storage performance [25,26]. Such methods can effectively suppress SD and improve the energy storage performance of PCMs.…”

Section: Introductionmentioning

confidence: 99%

Study on the Phase Change Characteristics of Carbon-Based Nanofluids

Teng

Hsiao

et al. 2018

Journal of Nanomaterials

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In this study, carbon-based nanofluids (CBNFs) with the minimized carbon materials (MCMs) were prepared using a graphite powder-based heating and cooling processing method (GP-HCPM). In addition, sodium dodecyl benzenesulfonate (SDBS) was added as a dispersant to enhance the stability of the CBNFs. Two methods, one involving fixed heating and cooling rates and the other involving fixed heating and cooling temperatures, were used to measure and analyze the phase change characteristics of the CBNFs and SDBS aqueous solution in order to evaluate the feasibility of employing CBNFs as phase change materials (PCMs) for cold storage applications. Results revealed that SDBS reduced the thermal conductivity (k) and increased the viscosity (μ), density (ρ), and specific heat (c p ) of the samples; the CBNFs tended to increase the k, μ, and ρ values but reduce the c p values of the samples, compared with water. Furthermore, the SDBS aqueous solution and CBNFs significantly reduced the contact angle of droplets, compared with water. Phase change experiments conducted for all samples revealed that the CBNF sample S4 demonstrated the greatest reduction ratios in onset nucleation time, solidification time, and subcooling degree (38.98%, 11.05%, and 35.41%, resp.); thus, S4 was determined to be the most suitable CBNF for use as a PCM in cold storage applications.

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Role of PCM based nanofluids for energy efficient cool thermal storage system

Cited by 129 publications

References 18 publications

Nano-enhanced phase change materials for improved building performance

Nano-enhanced phase change materials for improved building performance

Study on the supercooling degree and nucleation behavior of water-based graphene oxide nanofluids PCM

Study on the Phase Change Characteristics of Carbon-Based Nanofluids

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