Critical analysis of the T-history method: A fundamental approach

Badenhorst, Heinrich; Cabeza, Luisa F.

doi:10.1016/j.tca.2017.02.005

Cited by 34 publications

(14 citation statements)

References 32 publications

(53 reference statements)

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“…In a recent work by Badenhorst & Cabeza 2017 [10], it was shown that the heat convection coefficient may vary largely in an air climate chamber.…”

Section: Discussion Of the T-history Methods Assumptionsmentioning

confidence: 99%

“…The mathematical expression In alternative formulations, this principle has been expressed in the form of different areas under the temperature versus time curve for the same temperature interval for PCM and reference, respectively [10,19].…”

Section: Mathematical Modelmentioning

confidence: 99%

“…For the T-History method on the other hand, work is still ongoing to find a suitable experimental setup as well as data evaluation technique [5,10,11].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Characterizing phase change materials using the T-History method: On the factors influencing the accuracy and precision of the enthalpy-temperature curve

et al. 2018

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“…In a recent work by Badenhorst & Cabeza 2017 [10], it was shown that the heat convection coefficient may vary largely in an air climate chamber.…”

Section: Discussion Of the T-history Methods Assumptionsmentioning

confidence: 99%

Section: Mathematical Modelmentioning

confidence: 99%

See 1 more Smart Citation

Characterizing phase change materials using the T-History method: On the factors influencing the accuracy and precision of the enthalpy-temperature curve

et al. 2018

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“…Figure 9 shows the comparative evolution of the melting peak temperatures, T m , against the different heating rates by considering the aforementioned two masses (low mass 7.9 mg and high mass 16.3 mg, respectively). It can be observed that the measured melting points, through the DSC tests for the small sample mass (7.9 mg), rather quickly approximates the melting peak temperature (i.e., 26 Also, for PureTemp 25 the comparison of melting peak temperatures, T m , against the various heating rates and two different masses (10.1 mg and 18.9 mg, respectively) is presented in Figure 10. As for RT25, the sample with the lower mass (10.1 mg) showed a less influence of the heating rate on the melting peak temperature (e.g., T m = 24.50 • C at 0.25 K/min and 24.25 • C at 0.125 K/min).…”

Section: Mass Of Sample Effect For Rt25 and Puretemp 25mentioning

confidence: 91%

“…THM easily allows to evaluate the heat capacity, temperature of melting/crystallization, enthalpy and phase change temperature. The accuracy and soundness of this method was evaluated by many researchers, see for example [26][27][28]. Hong et al [29] verified the accuracy of a modified THM for several PCMs, having different freezing patterns.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study on the Thermal Energy Storage Performance of Bio-Based and Paraffin-Based PCMs Using DSC Procedures

et al. 2020

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Thermal-Energy Storage (TES) properties of organic phase change materials have been experimentally investigated and reported in this paper. Three paraffin-based Phase Change Materials (PCMs) and one bio-based PCM are considered with melting temperatures of 24 °C, 25 °C and 26 °C. Sensible heat storage capacities, melting characteristics and latent heat enthalpies of the studied PCMs are investigated through Differential Scanning Calorimetry (DSC) measurements. Two alternative methods, namely the classical dynamic DSC and a stepwise approach, are performed and compared with the aim to eliminate and/or overcome possible measurement errors. In particular, for DSC measurements this could be related to the size of the samples and its representativity, heating rate effects and low thermal conductivity of the PCMs, which may affect the results and possibly cause a loss of objectivity of the measurements. Based on results achieved from this study, clear information can be figured out on how to conduct and characterize paraffin and bio-based PCMs, and how to apply them in TES calculations for building applications and/or simulations. It is observed that both paraffinic and bio-based PCMs possess a comparable TES capacity within the selected phase transition temperature, being representative for the human thermal comfort zone. The phase change of bio-based PCMs occurred over a much narrower temperature range when compared to the wider windows characterizing the paraffin-based materials. Bio-based PCMs turned out to be very suitable for building applications and can be an environmentally friendly substitute for petroleum-based PCMs.

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Thermal performance and mold discoloration of thermally modified wood containing bio‐based phase change material for heat storage

et al. 2022

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The work presents the results of thermal performance and mold discoloration of thermally modified wood‐based composites incorporating multicomponent fatty acids as a bio‐based phase change materials (BPCM). Thermally modified Scots pine (TMP), beech (TMB), and spruce (TMS) sapwood were impregnated with a multicomponent mixture of linoleic acid and coconut oil fatty acids at a ratio of 20:80. Samples with different BPCM uptakes were analyzed in the temperature range typical for building indoor conditions. Leakage tests were conducted and revealed that the maximum leakage for all the samples is 3% to 5%. T‐history and heat flowmeter methods were used to evaluate the thermal characteristic of the composites. The incorporation of BPCM into thermally modified woods (TMWs) resulted in significant thermal mass improvements, expressed by the ability of the composites to store excessive energy in terms of latent heat and keep the temperature constant for long time. The specific heat capacity of the TMWs was around 2 J/g K, which increased to 4 to 8 J/g K after impregnation with BPCM, depending on the impregnation uptake. Results showed also that TMB has higher thermal conductivity than TMP and TMS, while incorporating of BPCM into these materials resulted in even improved thermal conductivity. Results showed that the thermal conductivity of TMP increased after incorporation of BPCM from 0.06 W/m K to 0.1 and 0.14 W/m K for TMP/BPCM with 48% and 95% uptake respectively. Mold tests showed that BPCM encapsulated in TMWs is less susceptible to mold discoloration compared to untreated wood.

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Critical analysis of the T-history method: A fundamental approach

Abstract: Està subjecte a una llicència de Reconeixement-NoComercial-SenseObraDerivada 4.

Cited by 34 publications

References 32 publications

Characterizing phase change materials using the T-History method: On the factors influencing the accuracy and precision of the enthalpy-temperature curve

Characterizing phase change materials using the T-History method: On the factors influencing the accuracy and precision of the enthalpy-temperature curve

A Comparative Study on the Thermal Energy Storage Performance of Bio-Based and Paraffin-Based PCMs Using DSC Procedures

Thermal performance and mold discoloration of thermally modified wood containing bio‐based phase change material for heat storage

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