Accuracy improvement of T-history method for measuring heat of fusion of various materials

Hong, Hyun Pyo; Kim, Sun Kuk; Kim, Yong-Shik

doi:10.1016/j.ijrefrig.2003.12.006

Cited by 128 publications

(59 citation statements)

References 1 publication

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“…The latent heat of solidification was obtained as [∆h p (T iS ) − ∆h p (T fS )] where T iS is the initial temperature of solidification calculated as the maximum value reached after sub-cooling and T fS is the final temperature, calculated according to as a point of inflection on the cooling curve of PCM [13].…”

Section: Thermal Analysis: T-history Methodsmentioning

confidence: 99%

“…The specific heat of PCM in the liquid (c pl ) and solid state (c ps ) was calculated in reference to the article of Marinas, where the gradients of the two straight lines are observable in the enthalpy versus temperature trend [12,13].…”

Section: Thermal Analysis: T-history Methodsmentioning

confidence: 99%

“…It is possible to see the supercooling limited to 2-3 • C and the repeatability of the cycles. As reported in the literatures [10][11][12][13], cooling curves have been used for the second part of the method, then by considering the cooling curves and Equation (3), the enthalpy versus temperature curves were determined for all the samples. The results obtained for sample C1 are shown in Figure 3.…”

Section: Thermal Analysis Of the Samplesmentioning

confidence: 99%

“…It is possible to see the supercooling limited to 2-3 °C and the repeatability of the cycles. As reported in the literatures [10][11][12][13] The thermal properties of the first sample, estimated by considering the method described in Section 2.2, are summarized in Table 4.…”

Section: Thermal Analysis Of the Samplesmentioning

confidence: 99%

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Thermal and Stability Investigation of Phase Change Material Dispersions for Thermal Energy Storage by T-History and Optical Methods

et al. 2017

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Glauber's salt (sodium sulphate decahydrate) is a promising phase change material (PCM) for use in the building sector, thanks to its high enthalpy of fusion associated with a proper phase transition temperature. It also offers economic and environmental advantages because it can be obtained as a byproduct from the disposal process of lead batteries. However, due to phenomena of phase segregation and supercooling, Glauber's salt cannot be used in its pure state and requires the addition of rheological modifiers and nucleating agents. In this work, the initial thermal performances of mixtures based on Glauber's salt with different compositions are compared by using the T-history method and adopting sonication for mixing, and following the same preparation procedure for all the samples. With fixed composition, the effects of the addition sequence of the reagents are also examined. The analysis carried out by optical methods based on light scattering (Turbiscan equipment) allowed us to identify the kinetics of destabilization for each sample and revealed the need to specify in detail the preparation stages of PCMs, in order to make the composition reproducible in the laboratory and on a wider scale.

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Section: Thermal Analysis: T-history Methodsmentioning

confidence: 99%

Section: Thermal Analysis: T-history Methodsmentioning

confidence: 99%

Section: Thermal Analysis Of the Samplesmentioning

confidence: 99%

Section: Thermal Analysis Of the Samplesmentioning

confidence: 99%

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Thermal and Stability Investigation of Phase Change Material Dispersions for Thermal Energy Storage by T-History and Optical Methods

et al. 2017

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“…Hong et al [17] showed 40% discrepancy between the original T-history and the modified T-history method when analyzing the experimental data.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Freezing Point of γ-Al₂O₃/Water Nanofluid

Maré

Ousmane

Halelfadl

et al. 2012

Advances in Mechanical Engineering

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Nanofluids are colloidal suspensions made of nanometer-sized particles dispersed in a conventional fluid. Their unusual thermal properties explain intensive investigations for several thermal and industrial applications. In this work, an experimental investigation was performed to measure the freezing point and to study the supercooling point made of alumina γ-Al 2 O 3 nanoparticles with 30 nm diameter size and deionized water. Particles' volume fraction used in this work is ranging from 1% to 4%. The T-historic method based on the measurement of the point of inflexion was performed to measure the thermal properties such as the freezing point and the latent heat of solidification of the nanofluids for different concentrations. The results show that the supercooling degree decreases for the high particles volume concentrations and that the agglomeration does not influence the temperature of the freezing point. However, it makes the freezing process longer.

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Characterization of granular phase changing composites for thermal energy storage using the T-history method

Rady

Arquis

Bot

2009

Int. J. Energy Res.

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SUMMARYThe present article reports on the characterization of granular phase changing composites using the T-history method. Further modifications and improvements of the method are employed to handle granular materials undergoing phase change over a temperature range. The accuracy of the T-history method is shown to be limited by the assumption of temperature-independent specific heats and the difficulty of determining the limits of solid and liquid phases. The concept of enthalpy and its relationship with temperature has been employed in the analysis to overcome these difficulties. Enthalpy-temperature and apparent heat capacity curves similar to those obtained using DSC have been developed. These characteristic curves are necessary for accurate design, modeling, and optimization of latent heat thermal energy storage systems. Experiments have been also carried out to measure the transient temperature distribution inside a cylindrical packed bed using phase changing granulates. Analysis of temperature variation along the bed shows good agreement with the measured phase change characteristics.

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Accuracy improvement of T-history method for measuring heat of fusion of various materials

Cited by 128 publications

References 1 publication

Thermal and Stability Investigation of Phase Change Material Dispersions for Thermal Energy Storage by T-History and Optical Methods

Thermal and Stability Investigation of Phase Change Material Dispersions for Thermal Energy Storage by T-History and Optical Methods

Experimental Study of the Freezing Point of γ-Al₂O₃/Water Nanofluid

Characterization of granular phase changing composites for thermal energy storage using the T-history method

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Accuracy improvement of T-history method for measuring heat of fusion of various materials

Cited by 128 publications

References 1 publication

Thermal and Stability Investigation of Phase Change Material Dispersions for Thermal Energy Storage by T-History and Optical Methods

Thermal and Stability Investigation of Phase Change Material Dispersions for Thermal Energy Storage by T-History and Optical Methods

Experimental Study of the Freezing Point of γ-Al2O3/Water Nanofluid

Characterization of granular phase changing composites for thermal energy storage using the T-history method

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Product

Resources

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Experimental Study of the Freezing Point of γ-Al₂O₃/Water Nanofluid