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

Liu, Yudong; Li, Xin; Hu, Pengfei; Hu, Guanghua

doi:10.1016/j.ijrefrig.2014.10.019

Cited by 97 publications

(42 citation statements)

References 23 publications

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“…The SD of S5 was 34.40% (i.e., 3.15 °C) lower than that of water; therefore, S5 was the most promising material for use as a PCM in this study. The related literature shows that the maximum reduction ratio for SD of the water-based PCM added graphene oxide [3], carbon nanotubes [15,17,18], and graphene [14,15] is about 12–100%. In addition, the maximum reduction ratio of SD using copper [5], aluminum oxide [10,11], titanium dioxide [12,13,14], and silicon dioxide [14] as additives is about 12–78%.…”

Section: Resultsmentioning

confidence: 99%

Preparation and Experimental Evaluation of Phase-Change Characteristics in Carbon-Based Suspensions

2018

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In this study, micro/nanocarbon-based materials (MNCBMs) were prepared using the high-pressure combustion method (HPCM) with an isoperibol oxygen bomb calorimeter at different oxygen pressures (0.5–3.0 MPa). The prepared MNCBMs were added to water to form carbon-based suspensions (CBSs); sodium dodecyl benzene sulfonate (SDBS) and defoamer were added to the CBSs to enhance their stability. The thermal conductivity, viscosity, density, and contact angle of the CBSs were measured using appropriate instruments to determine their fundamental characteristics. The phase-change characteristics of the CBSs were measured and analyzed using a differential scanning calorimeter (DSC) to evaluate the feasibility of employing them as phase-change materials in ice-storage air-conditioning systems. The results revealed that the maximal change ratios of thermal conductivity, viscosity, density, and contact angle of the samples were −3.15%, 6.25%, 0.23%, and −57.03%, respectively, as compared with the water. The CBS of S5 (oxygen pressure of 2.0 MPa) had the lowest melting temperature and subcooling degree (SD) and the highest freezing temperature in the experiments conducted using the DSC; thus, S5 was determined to be the most suitable CBS for use as a phase-change material of cold energy storage in this study.

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Section: Resultsmentioning

confidence: 99%

Preparation and Experimental Evaluation of Phase-Change Characteristics in Carbon-Based Suspensions

2018

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“…In recent years, numerous studies of carbon-based nanomaterials (CBNMs) such as nanocarbons, carbon nanotubes (CNTs), graphene (GN), and graphene oxide (GO) have been conducted, which indicate these materials have high thermal conductivity [28,29], excellent heat transfer performance [30,31], and low SD and freezing duration in phase change process [7][8][9]11]. In addition, CBNMs have high stability and are nonperishable in liquids.…”

Section: Introductionmentioning

confidence: 99%

“…The addition of SDBS could improve suspension stability of nanofluids and further reduce the SD, but it also slightly increases the total freezing time. Liu et al [9] prepared low concentration of GO nanosheet aqueous nanofluids without any dispersants as a PCM for cold storage. The SD of nanofluids with different concentrations was tested experimentally in an isothermal bath at −15°C.…”

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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“…For instance, some researchers [7,8,9] found that adding graphene (0.02 wt %) could reduce the supercooling degree of pure water. On other studies, Li et al [10,11] confirmed that SrCl 2 ·6H 2 O could reduce the supercooling of inorganic PCM.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Graphene Oxide/SrCl2·6H2O Modified CaCl2·6H2O and the Resulting Thermal Performances

Jin

Tian

et al. 2018

Materials

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Although the inorganic salt hydrate phase change materials (PCMs) such as CaCl2·6H2O have promising potential for thermal energy storage in building application, the issue of supercooling has restricted their practical application. In this study, graphene oxide (GO) and SrCl2·6H2O as binary nucleation agents were used to modify CaCl2·6H2O and reduce its supercooling degree. Compared with pure CaCl2·6H2O, the incorporation of graphene oxide (GO)/SrCl2·6H2O reduced the supercooling degree to 0.3 °C significantly. In addition, the supercooling degree of modified CaCl2·6H2O after 200 thermal cycles was still much lower than that of non-modified CaCl2·6H2O. From the results of differential scanning calorimetry (DSC), the latent heat value and phase change temperature of the modified CaCl2·6H2O were 207.88 J/g and 27.6 °C, respectively. Aluminum capsules were used to encapsulate the modified PCM and placed inside the composite wallboard. The thermal performances of the composite wallboard with modified PCM were investigated using infrared thermography. Experimental results showed that the average temperature difference between the top and bottom surfaces of modified CaCl2·6H2O/wallboard composite after 1 h heating was kept around 15.8 °C, while it was 4.9 °C for the control wallboard. The above test results proved that the modified CaCl2·6H2O demonstrated good thermal performance and can be used in buildings to maintain thermal comfort.

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

Cited by 97 publications

References 23 publications

Preparation and Experimental Evaluation of Phase-Change Characteristics in Carbon-Based Suspensions

Preparation and Experimental Evaluation of Phase-Change Characteristics in Carbon-Based Suspensions

Study on the Phase Change Characteristics of Carbon-Based Nanofluids

Experimental Investigation on Graphene Oxide/SrCl2·6H2O Modified CaCl2·6H2O and the Resulting Thermal Performances

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