A numerical study of external building walls containing phase change materials (PCM)

Izquierdo-Barrientos, M.A.; Belmonte, J.F.; Rodríguez-Sánchez, David; Molina, A.E.; Almendros-Ibáñez, J.A.

doi:10.1016/j.applthermaleng.2012.02.038

Cited by 157 publications

(46 citation statements)

References 17 publications

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“…Energies 2016, 9,30 conductivity of the liquid PCM, which reduced the heat transmission to the room and thereby increased the wall top surface temperature. The maximum value of heat flux through the PCM including and excluding the external wall at 9 h is found to be 312 W/m 2 and 162 W/m 2 , respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Energies 2016, 9,30 (35 °C) between 16 h and 17 h and then decreases. This is due to the fact that initially (up to 12 h), the heat is absorbed by the room walls and roof exposed to sun and then slowly released, which caused a greenhouse-like effect of an inner increase of the temperature, as expected.…”

Section: Resultsmentioning

confidence: 99%

“…Energies 2016, 9,30 An explicit numerical solution for a single material two-phase node is given by:…”

Section: Two-phase Solutionmentioning

confidence: 99%

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Phase Change Materials-Assisted Heat Flux Reduction: Experiment and Numerical Analysis

et al. 2016

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Phase change materials (PCM) in the construction industry became attractive because of several interesting attributes, such as thermo-physical parameters, open air atmospheric condition usage, cost and the duty structure requirement. Thermal performance optimization of PCMs in terms of proficient storage of a large amount of heat or cold in a finite volume remains a challenging task. Implementation of PCMs in buildings to achieve thermal comfort for a specific climatic condition in Iraq is our main focus. From this standpoint, the present paper reports the experimental and numerical results on the lowering of heat flux inside a residential building using PCM, which is composed of oil (40%) and wax (60%). This PCM (paraffin), being plentiful and cost-effective, is extracted locally from waste petroleum products in Iraq. Experiments are performed with two rooms of identical internal dimensions in the presence and absence of PCM. A two-dimensional numerical transient heat transfer model is developed and solved using the finite difference method. A relatively simple geometry is chosen to initially verify the numerical solution procedure by incorporating in the computer program two-dimensional elliptic flows. It is demonstrated that the heat flux inside the room containing PCM is remarkably lower than the one devoid of PCM.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Phase Change Materials-Assisted Heat Flux Reduction: Experiment and Numerical Analysis

et al. 2016

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“…Detailed studies on the above issues can be found e.g. in (Evola et al 2013;Izquierdo et al 2012;Marin et al 2016;Osterman et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Heat Storage Unit Made of PCM-gypsum Composite Integrated with the Ventilation System of the Building

Jaworski

Jędrzejuk

Laskowski

2017

Proccedings of 10th International Conference "Environmental Engineering"

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Abstract. In the paper a special heat storage unit for building applications is presented. It has a form of a ceiling panel that is made of PCM-gypsum mortar composite and it contains internal channels for air flow, since it is designed as a part of ventilation system of the building. The panel works as a regenerative heat exchanger with phase change material (PCM) as a prevailing heat storage medium. When a melting point of PCM is properly chosen it is possible that air temperature flowing into the building reach a level corresponding to thermal comfort conditions, regardless the temperature at the intake. Warm air (during a day) releases heat basically to PCM causing its melting. During night time cool ambient air is heated up while it takes back heat accumulated in PCM. An experimental set-up based on the above concept was developed. A series of tests in different conditions (for variable inlet air temperatures, air flow rates) were performed. Information on thermal performance of the ceiling panel as well as detailed data on heat transfer process were obtained and discussed in the paper.

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“…Despite the higher conductivity, compared to usual insulation materials used in buildings, PCM have been proved efficient in reducing peak heat fluxes by as much as 38% [14]. Indeed this property makes them ideal for passive heat storage in different building applications such as in the envelope of the building, in radiant floor heating systems, in free cooling systems, in photovoltaic elements and in building integrated PV [15][16][17][18][19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

On the Efficacy of PCM to Shave Peak Temperature of Crystalline Photovoltaic Panels: An FDM Model and Field Validation

Brano¹,

Ciulla²,

Piacentino³

et al. 2013

Energies

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Abstract:The exploitation of renewable energy sources and specifically photovoltaic (PV) devices have been showing significant growth; however, for a more effective development of this technology it is essential to have higher energy conversion performances. PV producers often declare a higher efficiency respect to real conditions and this deviation is mainly due to the difference between nominal and real temperature conditions of the PV. In order to improve the solar cell energy conversion efficiency many authors have proposed a methodology to keep the temperature of a PV system lower: a modified crystalline PV system built with a normal PV panel coupled with a Phase Change Material (PCM) heat storage device. In this paper a thermal model analysis of the crystalline PV-PCM system based on a theoretical study using finite difference approach is described. The authors developed an algorithm based on an explicit finite difference formulation of energy balance of the crystalline PV-PCM system. Two sets of recursive equations were developed for two types of spatial domains: a boundary domain and an internal domain. The reliability of the developed model is tested by a comparison with data coming from a test facility. The results of numerical simulations are in good agreement with experimental data.Keywords: phase change material; crystalline photovoltaic modules; heat storage; finite difference method; experimental validation

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A numerical study of external building walls containing phase change materials (PCM)

Cited by 157 publications

References 17 publications

Phase Change Materials-Assisted Heat Flux Reduction: Experiment and Numerical Analysis

Phase Change Materials-Assisted Heat Flux Reduction: Experiment and Numerical Analysis

Experimental Study of Heat Storage Unit Made of PCM-gypsum Composite Integrated with the Ventilation System of the Building

On the Efficacy of PCM to Shave Peak Temperature of Crystalline Photovoltaic Panels: An FDM Model and Field Validation

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