A non-parametric method for estimating enthalpy-temperature functions of shape-stabilized phase change materials

Barrio, Elena Palomo del; Dauvergne, Jean-Luc

doi:10.1016/j.ijheatmasstransfer.2010.10.025

Cited by 24 publications

(6 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These results show a decreasing tendency of both properties with temperature when the PCM is in solid state (<25 • C). The enthalpy as a function of temperature was estimated from the DSC measurements according to equations available in the literature [41]. The enthalpy of mPCM-modified plaster with the implemented weight fraction is shown in Figure 3.…”

Section: Methodsmentioning

confidence: 99%

Experimental and Computational Study of the Implementation of mPCM-Modified Gypsum Boards in a Test Enclosure

et al. 2020

View full text Add to dashboard Cite

The application of phase change materials (PCM) in the thermal envelope of buildings has proven to be an alternative to reduce energy consumption and to improve thermal comfort conditions. The present work evaluates the thermal behavior of gypsum boards modified with a microencapsulated PCM (mPCM) in a cubic test enclosure, considering the climatic conditions of Santiago de Chile in the September–November period of 2017. The design of the test enclosure was performed considering the minimization of parameters that affect the variation of its inner temperature and favoring the heat flow through the gypsum boards. Experimentally, the results reflect the main effects of the implementation of a mPCM, among which the displacement of the maximum heat load and the decrease in the daily oscillation of the internal temperature of the test enclosure (up to 2 °C) stand out. In addition, the mPCM modified gypsum board was thermally characterized to carry out a thermal simulation of the enclosures using EnergyPlus™. The obtained numerical results agree with those obtained experimentally, including the behavior of the transient heat flux through the gypsum boards. Moreover, it was found that considering a null infiltration rate gives place to unrealistic results, suggesting that this parameter should be controlled.

show abstract

Section: Methodsmentioning

confidence: 99%

Experimental and Computational Study of the Implementation of mPCM-Modified Gypsum Boards in a Test Enclosure

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The use of the T-history method for the evaluation of the h-T curves of these solid PCM composites is very promising. For example, Rady et al [4] applied this method for the thermal characterization of PCM granules and Palomo and Dauvergne [13] developed an experimental methodology similar to T-history, in terms of sample geometry and thermal excitation, that allowed the complete thermodynamic characterization of SSPCM by means of a mathematical inverse method analysis.…”

Section: General Assumptionsmentioning

confidence: 99%

“…For low values of the Biot number, Bessel functions can be truncated in order to simplify the solution. Therefore, the transcendental equation ( 12) can be approximated by equation (13), expressed in terms of the Biot number and relative heat capacity of the sample (C r , defined in table 1), for the calculation of the first eigenvalue of the problem (ξ 1 ):…”

Section: Analytic Model: Estimation Of Deviation In Specific Heatmentioning

confidence: 99%

A theoretical study on the accuracy of the T-history method for enthalpy–temperature curve measurement: analysis of the influence of thermal gradients inside T-history samples

Mazo

Delgado

Lázaro

et al. 2015

Meas. Sci. Technol.

View full text Add to dashboard Cite

The present work analyses the effect of radial thermal gradients inside T-history samples on the enthalpy temperature curve measurement. A conduction heat transfer model has been utilized for this purpose. Some expressions have been obtained that relate the main dimensionless numbers of the experiments with the deviations in specific heat capacity, phase change enthalpy and phase change temperature estimations. Although these relations can only be strictly applied to solid materials (e.g. measurements of shape stabilized phase change materials, SSPCM), they can provide some useful and conservative bounds for the deviations of the T-history method. Biot numbers emerge as the most relevant dimensionless parameters in the accuracy of the specific heat capacity and phase change enthalpy estimation whereas this model predicts a negligible influence of the temperature levels used for the experiments or the Stefan number.

show abstract

“…Also, if the body parts are not covered with clothing (e.g., hands and the head), the sweat drips off the skin accordingly. For PCM layers, the so-called apparent heat capacity method [ 37 , 38 ] is applied to solve the heat transfer equations. For detailed information on the coupling of Equations (5) and (6) with the Tanabe human thermoregulatory model, please refer to references [ 34 , 36 ].…”

Section: Methodsmentioning

confidence: 99%

A Numerical Analysis of the Cooling Performance of a Hybrid Personal Cooling System (HPCS): Effects of Ambient Temperature and Relative Humidity

Kang

Wang

et al. 2020

IJERPH

View full text Add to dashboard Cite

Hybrid personal cooling systems (HPCS) incorporated with ventilation fans and phase change materials (PCMs) have shown its superior capability for mitigating workers’ heat strain while performing heavy labor work in hot environments. In a previous study, the effects of thermal resistance of insulation pads, and latent heat and melting temperature of PCMs on the HPCS’s thermal performance have been investigated. In addition to the aforementioned factors, environmental conditions, i.e., ambient temperature and relative humidity, also significantly affect the thermal performance of the HPCS. In this paper, a numerical parametric study was performed to investigate the effects of the environmental temperature and relative humidity (RH) on the thermal management of the HPCS. Five levels of air temperature under RH = 50% (i.e., 32, 34, 36, 38 and 40 °C) and four levels of environmental RH at two ambient temperatures of 36 and 40 °C were selected (i.e., RH = 30, 50, 70 and 90%) for the numerical analysis. Results show that high environmental temperatures could accelerate the PCM melting process and thereby weaken the cooling performance of HPCS. In the moderately hot environment (36 °C), HPCS presented good cooling performance with the maximum core temperature at around 37.5 °C during excise when the ambient RH ≤ 70%, whereas good cooling performance could be only seen under RH ≤ 50% in the extremely hot environment (40 °C). Thus, it may be concluded that the maximum environmental RH under which the HPCS exhibiting good cooling performance decreases with an increase in the environmental temperature.

show abstract

A non-parametric method for estimating enthalpy-temperature functions of shape-stabilized phase change materials

Cited by 24 publications

References 22 publications

Experimental and Computational Study of the Implementation of mPCM-Modified Gypsum Boards in a Test Enclosure

Experimental and Computational Study of the Implementation of mPCM-Modified Gypsum Boards in a Test Enclosure

A theoretical study on the accuracy of the T-history method for enthalpy–temperature curve measurement: analysis of the influence of thermal gradients inside T-history samples

A Numerical Analysis of the Cooling Performance of a Hybrid Personal Cooling System (HPCS): Effects of Ambient Temperature and Relative Humidity

Contact Info

Product

Resources

About