Energy and cost efficiency of phase change materials integrated in building envelopes under Tunisia Mediterranean climate

Saafi, Khawla; Daouas, Naouel

doi:10.1016/j.energy.2019.115987

Cited by 88 publications

(31 citation statements)

References 41 publications

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“…From the energetic point of view, the summer energy saving is 11.7%, instead, the winter energy saving is 1.6%. The results obtained are comparable, although qualitatively, with those provided by Saafi et al [48]. The study focused on the application of a PCM on the internal surface of the building envelope, under the Tunisia Mediterranean climate.…”

supporting

confidence: 79%

Phase Change Materials for Reducing Cooling Energy Demand and Improving Indoor Comfort: A Step-by-Step Retrofit of a Mediterranean Educational Building

et al. 2019

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The present work concerns the energy retrofit of a public educational building at the University of Molise, located in Termoli, South Italy. The study provides a comparison of the results obtained by different dynamic simulations of passive strategies to improve thermal comfort and energy behavior of the building during the summer regime. Firstly, the building model was calibrated against historical consumption data. Then, a subsequent step involves the technical-economic analysis, by means of building performance simulations, of energy upgrading scenarios, specifically, cool roof and green roof technologies for the horizontal opaque envelope and thermal insulation, vented façade, and phase change materials’ applications for the vertical opaque envelope. Improving the indoor thermal comfort and reducing the thermal energy demand during summertime through innovative solutions will be the primary objective of the present study. The energy efficiency measures are compared from the energy, emissions, costs, and indoor comfort points of view. Phase Change Materials applied to the inner side of the external walls are analyzed in depth and, by varying their melting temperature, optimization of design is performed too. This innovative material, with a melting temperature of 23 °C and a freezing temperature of 21 °C, determines the reduction of summer energy consumption of 11.7% and the increase of summer indoor comfort of 215 h. Even if consolidated, other solutions, like the cool roof, green roof, thermal insulation, and vented façade induce improvements in terms of summer energy saving, and the percentage difference compared to the basic building is less than 2%. For this case study, a Mediterranean building, with construction characteristics typical of the 1990s, traditional passive technologies are not very efficient in improving the energy performance, so the investigation focused on the adoption of innovative solutions such as PCMs, for reducing summer energy demand and improving indoor thermal comfort.

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confidence: 79%

Phase Change Materials for Reducing Cooling Energy Demand and Improving Indoor Comfort: A Step-by-Step Retrofit of a Mediterranean Educational Building

et al. 2019

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“…Saafi and Daouas [142] performed a numerical study, using Energy Plus, on the effect of integrating PCM into building envelopes within the Mediterranean climate of Tunisia. Results showed that integrating PCM on the outside face of a brick wall contributed to an energy saving of 13.4% for south orientation.…”

Section: Hybrid Passive Methodsmentioning

confidence: 99%

A review on phase change materials for thermal energy storage in buildings: Heating and hybrid applications

Faraj

Khaled

Faraj

et al. 2021

Journal of Energy Storage

182

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Researchers worldwide are investigating thermal energy storage, especially phase change materials, for their substantial benefits in improving energy efficiency, sustaining thermal comfort in buildings and contributing to the reduction of environmental pollution. Residential buildings and commercial constructions, being dependent on heating and cooling systems, are subjected to the utilization of PCM technology through several applications. The current study presents a state-of-the-art review that covers recent literature on thermal energy storage systems utilizing PCMs for buildings. The reviewed applications are heating and hybrid applications, that are categorized as passive and active systems. A summary of the PCMs used, applications, thermo-physical properties and incorporation methods are presented as well. The study emphasizes the promising effectiveness of PCM in building heating applications, and highlights the significance of PCM system hybridization. The study shows that experimental investigations on commercial constructions, and hybrid systems development and optimization, are still required. Finally, possible combinations of active and passive heating applications with their auspicious benefits in terms of energy efficiency augmentation, are recommended. Highlights  State-of-the-art review on PCM building applications for heating and hybrid systems  Active and Passive classification for heating and hybrid systems  Challenges altering the PCM technology for energy-efficient buildings are addressed  Hybridization of active and passive systems forms a potential method toward NZEB

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“…Secondly, adding phase change materials to the building materials to increase the thermal inertia of the building and reduce the temperature fluctuations of the room, thereby reducing the air conditioning or heating load, and achieving the purpose of building energy saving. For instance, phase change materials are combined with building envelopes or building materials and applied to walls, floors, ceilings, and concrete (Zhou et al, 2012;Zhu et al, 2015;Fu et al, 2017;Saafi and Daouas, 2019). Thirdly, using phase change materials to absorb heat for heating, such as active or passive solar greenhouses often use phase change materials with a phase change temperature of 50-60°C (Xie et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of Composite Phase Change Materials for Building Energy Saving

et al. 2021

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Composites composed of paraffin wax and copper foam with porosity of 95 % and pore density of 15 ppi, 30 ppi, and 50 ppi were prepared by the melt impregnation method. Two building models of the same size were made using gypsum board. The roof of the experimental model was covered with 50ppi copper foam /paraffin composite phase change board, and the roof of the reference model was covered with foam insulation board. The heat transfer experiment was conducted with a constant heat flux. EnergyPlus software was also employed to simulate the energy saving effects of the building models. The size and material of the model established during the simulation are consistent with the experimental model. Experimental results showed that the phase change composite board delayed the highest indoor temperature for 1.5 h, and it also reduced the indoor maximum temperature by 1.2° and the indoor energy consumption by 21 %. The simulation results showed that the phase change composites board delayed the appearance of the highest indoor temperature by 1.3 h and reduced the highest indoor temperature by 1.1°C, and the maximum indoor energy consumption decreased by 19 %. The copper foam/paraffin composite material can effectively improve the thermal comfort and reduce the energy consumption of the building model.

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Energy and cost efficiency of phase change materials integrated in building envelopes under Tunisia Mediterranean climate

Cited by 88 publications

References 41 publications

Phase Change Materials for Reducing Cooling Energy Demand and Improving Indoor Comfort: A Step-by-Step Retrofit of a Mediterranean Educational Building

Phase Change Materials for Reducing Cooling Energy Demand and Improving Indoor Comfort: A Step-by-Step Retrofit of a Mediterranean Educational Building

A review on phase change materials for thermal energy storage in buildings: Heating and hybrid applications

Experimental and Numerical Investigation of Composite Phase Change Materials for Building Energy Saving

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