Estimation of the Thermal Properties of PCMs through Inverse Modelling

Cascone, Ylenia; Perino, Marco

doi:10.1016/j.egypro.2015.11.275

Cited by 21 publications

(4 citation statements)

References 18 publications

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“…The analysis is generally performed by measuring the response, in terms of time profiles of the heat flux density on the side exposed to a constant temperature. Some examples of these tests are reported in [3] and [35].…”

Section: Measurement Methodsmentioning

confidence: 99%

Sinusoidal response measurement procedure for the thermal performance assessment of PCM by means of dynamic heat flow meter apparatus

Fantucci

Goia

Perino

et al. 2019

Energy and Buildings

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The implementation, in Building Performance Simulations (BPS) tools, of robust models capable of simulating the thermophysical behaviour of a Phase Change Material (PCM) represents a fundamental step for an appropriate thermal evaluation of buildings that adopt PCM-enhanced envelope components. Reliable and robust measuring procedures are essential, at a material and component level, to provide experimental data for the empirical validation of software tools. The traditional laboratory tests that are generally used for the validation of models present some limitations, because PCMs are usually subjected to conditions that may be very different from the real boundary conditions of the building components in which PCMs are applied. Furthermore, in many experimental full-scale mockups, the relatively small quantity of installed PCM and the combination of several thermal phenomena do not allow software tools to be tested in a reliable way. In this paper, an experimental procedure, based on a modified Heat Flow Meter Apparatus, has been developed to test the behaviour of PCM-enhanced components; the procedure, which is based on the measurement of the sinusoidal response, has been set up to provide data for the comparison and testing of numerical models and of BPS tools. Moreover, general indications and guidelines are provided to solve some issues related to building specimens that contain bulk PCM in order to obtain a more accurate measurement of their performance.// The experimental results presented in this paper were obtained from two different bulk PCMs (organic and inorganic). It was found that it is important to evaluate different PCM typologies and different thermophysical boundary conditions, including partial and full phase transitions, to test simulation codes that implement PCM modelling functions. In fact, some phenomena, such as hysteresis and subcooling effects are more evident when partial phase transition takes place. The results related to the characterization of the thermal conductivity of a paraffin-based PCM have shown a significant increase (up to 42%) of the equivalent thermal conductivity from a solid to a liquid state, with an upward heat flux, thus highlighting that further investigations and improvements are needed to measure the equivalent thermal conductivity in the different PCM phases.

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Section: Measurement Methodsmentioning

confidence: 99%

Sinusoidal response measurement procedure for the thermal performance assessment of PCM by means of dynamic heat flow meter apparatus

Fantucci

Goia

Perino

et al. 2019

Energy and Buildings

Self Cite

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“…It also used an implicit finite difference scheme for numerically resolving the associated heat transfer equations, wherein the user could select the fully implicit or the Crank‐Nicolson equation. Equation presented the calculation technique used for a fully implicit approach for the homogeneous materials using a uniform node spacing

c_{p} ρ Δ x \frac{T_{i}^{j + 1} - T_{i}^{j}}{Δ t} = K_{W} \frac{(T_{i + 1}^{j + 1} - T_{i}^{j + 1})}{Δ x} + K_{E} \frac{(T_{i - 1}^{j + 1} - T_{i}^{j + 1})}{Δ x},

where…”

Section: Methodsmentioning

confidence: 99%

Improvements of building envelope using passive cooling techniques to reduce the cooling load in hot‐dry regions

Hussein

2019

Heat Trans. Asian Res.

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In developed countries, the buildings are responsible for massive energy consumption. When the construction is based on the use of nonsustainable methods, the buildings were dependent on the active systems, for ensuring a maximal indoor comfort. This has increased energy consumption and related greenhouse gas emissions. In this study, a reduction technique of cooling load and power consumption in buildings is proposed.This technique involves the combination of three passive cooling techniques, thermal insulation, phase change materials (PCMs), and electrochromic double glazing. These techniques are applied through simulation software "DesignBuilder" to a building envelope model in various areas like walls, roofs, and glazing. For this purpose, a standard building model is compared with 16 other cases that incorporated the passive cooling techniques for determining the effectiveness of the proposed method. The results show that a combination of PCMs, thermal insulation, and double glazing can reduce the cooling load from 70.37 to 50.53 kW and the energy consumption from 1.51 to 0.90 kWh/m 2 .

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“…In this paper, dynamic measurements carried out with a DHFMA have been carried out to provide experimental data for model validation. In a previous research activity [48] carried out with the same device, attempts have been made to derive enthalpy-temperature curve through inverse modelling. The results from this activity presented in this paper highlight how further investigation on the determination of the material's properties when adopted in full-scale structures are still very necessary, in order to improve the reliability of simulations.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Modelling and experimental validation of an algorithm for simulation of hysteresis effects in phase change materials for building components

Goia

Chaudhary

Fantucci

2018

Energy and Buildings

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The use of Phase Change Materials (PCM) in different building applications is a hot topic in today's R&D activities. Numerical simulations of PCM-based components are often used both for research activities and as a design tool, although present-day codes for building performance simulation (BPS) present some shortcomings that limit their reliability. One of these limitations is the limited possibility of replicating the effects given by thermal hysteresisa characteristic of several PCMs.

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Estimation of the Thermal Properties of PCMs through Inverse Modelling

Cited by 21 publications

References 18 publications

Sinusoidal response measurement procedure for the thermal performance assessment of PCM by means of dynamic heat flow meter apparatus

Sinusoidal response measurement procedure for the thermal performance assessment of PCM by means of dynamic heat flow meter apparatus

Improvements of building envelope using passive cooling techniques to reduce the cooling load in hot‐dry regions

Modelling and experimental validation of an algorithm for simulation of hysteresis effects in phase change materials for building components

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