Simulation-based optimization of PCM melting temperature to improve the energy performance in buildings

Saffari, Mohammad; Gracia, Álvaro de; Fernàndez, Cèsar; Cabeza, Luisa F.

doi:10.1016/j.apenergy.2017.05.107

Cited by 264 publications

(92 citation statements)

References 68 publications

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“…Solgi et al . investigates the financial viability of PCMs for different climates in Iran and summarized the change of the optimum PCM peak melting temperature for total annual energy consumption with different climate zones (Table ) . The melting temperature of the microencapsulated PCM used in this study was also measured as 25.5 °C in accordance with the values given in Table .…”

Section: Discussionmentioning

confidence: 97%

Performance of glass fiber‐reinforced cement composites containing phase change materials

Tuncel

Pekmezci

2018

Env Prog and Sustain Energy

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The use of solar energy has become a promising method to reach energy efficient solutions throughout the last century. Improving the thermal properties of building members will contribute to the efficient use of energy by preventing heat gain/loss through the building envelope. Phase change materials (PCMs) are favorable materials for thermal applications because of their large contribution to the thermal mass of a building and thus providing “inertia” against temperature fluctuations. In this experimental study, glass fiber‐reinforced cementitious composites were modified using a commercial microencapsulated PCM to improve their thermal performance. The thermal and the mechanical performances of the composites were investigated. With the use of PCMs, the latent heat capacity of the composites increased while the thermal conductivity decreased. Conversely, the mechanical properties of composites declined with increases in PCM amount. The main conclusions of the experimental study are as follows: PCMs provide a great potential to fiber‐reinforced cementitious composites to support the efficient use of energy, thereby enhancing the thermal features of the composites. The performance of PCM composites shows a serious variation according to different service temperatures. Therefore, the effect of service temperature must be considered particularly with respect to safe utilization of these materials. © 2018 American Institute of Chemical Engineers Environ Prog, 38:e13061, 2019

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Section: Discussionmentioning

confidence: 97%

Performance of glass fiber‐reinforced cement composites containing phase change materials

Tuncel

Pekmezci

2018

Env Prog and Sustain Energy

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“…Simulation-based optimization is an important and initial step for designing energy-efficient buildings and evaluating innovative green and sustainable strategies [21]. In the present paper, EnergyPlus building simulation software [35] was used to numerically evaluate the building prototypes and then, for optimization purposes, it was coupled with a generic optimization program, i.e., GenOpt [36].…”

Section: Overviewmentioning

confidence: 99%

“…Selecting several initial points increases the chance of obtaining the global minimum in case of objective functions with various local minima. Therefore, in the present study, the Hooke-Jeeves algorithm with GPS implementation and various starting points was used for minimization of the cost function [21].…”

Section: Optimization Analysismentioning

confidence: 99%

“…Given this interaction between roof coating optical properties and sub-roof insulation level for building energy efficiency, optimization analysis involving these two envelope characteristics appears to be a valuable tool. Optimization techniques, indeed, were spreading in the last few years for efficient building design [21]. Both multi-objective and single-objective optimization studies were performed for improving buildings energy performance.…”

Section: Introductionmentioning

confidence: 99%

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Cool Roof Impact on Building Energy Need: The Role of Thermal Insulation with Varying Climate Conditions

et al. 2019

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Cool roof effectiveness in improving building thermal-energy performance is affected by different variables. In particular, roof insulation level and climate conditions are key parameters influencing cool roofs benefits and whole building energy performance. This work aims at assessing the role of cool roof in the optimum roof configuration, i.e., combination of solar reflectance capability and thermal insulation level, in terms of building energy performance in different climate conditions worldwide. To this aim, coupled dynamic thermal-energy simulation and optimization analysis is carried out. In detail, multi-dimensional optimization of combined building roof thermal insulation and solar reflectance is developed to minimize building annual energy consumption for heating-cooling. Results highlight how a high reflectance roof minimizes annual energy need for a small standard office building in the majority of considered climates. Moreover, building energy performance is more sensitive to roof solar reflectance than thermal insulation level, except for the coldest conditions. Therefore, for the selected building, the optimum roof typology presents high solar reflectance capability (0.8) and no/low insulation level (0.00-0.03 m), except for extremely hot or cold climate zones. Accordingly, this research shows how the classic approach of super-insulated buildings should be reframed for the office case toward truly environmentally friendly buildings.

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“…The solid-liquid phase change process has a wide range of applications in industrial fields such as waste heat recovery [1][2][3], thermal energy storage [4,5], heat dissipation in electronic device [6][7][8][9] and building energy conservation [10,11], because of its significant advantages such as high energy density, minor volume change, and simple device structure. However, the thermal conductivity of most known phase change materials (PCM) is relatively low, which makes the heat transfer efficiency of the PCM heat storage process relatively low [5].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Melting Heat Transfer in Dendritic Heat Exchangers

Luo

Liao

2018

Energies

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The dendritic fin was introduced to improve the solid-liquid phase change in heat exchangers. A theoretical model of melting phase change in dendritic heat exchangers was developed and numerically simulated. The solid-liquid phase interface, liquid phase rate and dynamic temperature change in dendritic heat exchanger during melting process are investigated and compared with radial-fin heat exchanger. The results indicate that the dendritic fin is able to enhance the solid-liquid phase change in heat exchanger for latent thermal storage. The presence of dendritic fin leads to the formation of multiple independent PCM zones, so the heat can be quickly diffused from one point to across the surface along the metal fins, thereby making the PCM far away from heat sources melt earlier and faster. In addition, the dendritic structure makes the PCM temperature distribution more uniform over the entire zone inside heat exchangers due to high-efficient heat flow distribution of dendritic fins. As a result, the time required for the complete melting of the PCM in dendritic heat exchanger is shorter than that of the radial-fin heat exchanger.

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Simulation-based optimization of PCM melting temperature to improve the energy performance in buildings

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

Cited by 264 publications

References 68 publications

Performance of glass fiber‐reinforced cement composites containing phase change materials

Performance of glass fiber‐reinforced cement composites containing phase change materials

Cool Roof Impact on Building Energy Need: The Role of Thermal Insulation with Varying Climate Conditions

Numerical Study on Melting Heat Transfer in Dendritic Heat Exchangers

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