Optical and thermal performance of glazing units containing PCM in buildings: A review

Liu, Dong; Wu, Yifan; Wang, Baichao; Liu, Changyu; Arıcı, Müslüm

doi:10.1016/j.conbuildmat.2019.117327

Cited by 171 publications

(45 citation statements)

References 142 publications

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“…Glazing, due to its high share of the assembly area, is the most influential factor determining the thermal performance and also the most heavily researched one. Several studies have investigated insulating glazing units (IGUs) thermal and spectral properties [6][7][8][9], while others proposed alternative contructions to replace traditional IGUs [10][11][12][13][14]. The most advanced IGUs currently on the market have U-values around 0.3-0.5 W/(m 2 K) and typically employ three glass layers, two or more low-emissivity (low-E) coatings, and an inert gas fill.…”

Section: Introductionmentioning

confidence: 99%

Operating Hardware Impact on the Heat Transfer Properties of Windows

et al. 2021

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Despite significant advancements in fenestration technology in the last two decades, the thermal transmittance of fenestration products is still significantly higher than that of walls. This corresponds to 60% of the total energy loss of a modern building envelope through the windows. Hence, further development and improvements of fenestration products are necessary. Increasingly stringent codes and standards for fenestration stimulate industry to work on improved solutions. Thus, it is crucial that assessment techniques are able to account for innovations accurately. The thermal effects of non-continuous hardware in window frames are currently ignored by international rating procedures. A preliminary investigation conducted by our team showed significant performance degradation in two of the three out-opening casement profiles caused by the presence of operating hardware. Frames with the structure made of vinyl and fiberglass consist of many air cavities that are penetrated by operating hardware made of highly conductive materials. In these frames, in order to have an accurate assessment, it may be required to employ three-dimensional modeling due to the convective nature of heat transfer within the cavities. However, in this study, we demonstrate that the three-dimensional (3D) effects of non-continuous hardware can be approximated accurately with simpler two-dimensional (2D) simulations. We then develop a simplified model based on weighted average capable of replacing the time- and computation-intensive 3D simulations with 2D simulations and validate it against market available frames and their corresponding hardware. Validation results show that our approximation technique results in discrepancies lower than 0.05 W/(m2K), or 3% of the total thermal transmittance. Thus, we conclude that simplified 2D simulation models may be used for predicting hardware impact in window frames with reasonable accuracy. As windows and glazing structures are becoming ever better thermally insulated, it is becoming even more important to be able to model the impact of the operating hardware on the total thermal performance in order to design the best windows possible and not let the operating hardware ruin an otherwise well-proven design, which is hence addressed in this study.

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Section: Introductionmentioning

confidence: 99%

Operating Hardware Impact on the Heat Transfer Properties of Windows

et al. 2021

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“…A suitable passive design by means of PCMs can bridge the gap in peak and off-peak loads of electricity requirements, reduce the use and size of heating, ventilation, and air-conditioning (HVAC) systems, and stabilize the indoor temperature (Khudhair and Farid, 2004; Pielichowska and Pielichowski, 2014). In passive systems, PCMs can be integrated into building walls, façade, shading system, fenestration, roofs, insulation, floors, and slabs (Akeiber et al, 2016; Kośny, 2015; Li et al, 2015, 2018, 2020). Nevertheless, PCMs require deep investigations for proper material selection, the quantity, and the location of PCM in the building envelope.…”

Section: Introductionmentioning

confidence: 99%

Dynamic modeling and performance assessment of single and double phase change material layer–integrated buildings in Mediterranean climate zone

Louanate

Otmani

Kandoussi

et al. 2020

Journal of Building Physics

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Nowadays, latent heat storage is becoming an imperative in building sector since it plays a crucial role in conserving energy through controlling the thermal comfort level. In this field, different storage systems based on phase change material show great performances in terms of energy saving, leading to a significant improvement of occupant thermal comfort. In this work, the thermal behavior and energy efficiency of a residential house incorporating various phase change materials (RT18HC, RT21HC, RT25HC, and RT28HC) in Mediterranean climate region were investigated via numerical simulations. EnergyPlus software was used to analyze the thermal performance of phase change materials applied to the interior wall surfaces of a simplified building model in El Jadida city. The integration of different single and double phase change material layers has been evaluated based on various concepts such as the average temperature fluctuation reduction and the monthly energy saving. The study showed that low melting point phase change material outperforms in terms of heating load, while phase change material with high melting temperature favors the cooling performance. Moreover, the results show that double-layer systems formed by two distinct phase change materials exhibit higher performance than a single phase change material layer throughout the whole year. The annual energy saving rate reaches 41.42% and 55.41% when using single and double phase change material layers, respectively. Finally, we opted for an optimum double-layer system for lower energy consumption in the selected city.

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“…For example, Du et al 25 developed a novel form‐stable poly(ethylene glycol)‐based polyurethane phase change material doped by amino‐functionalized single‐walled carbon nanotubes, which exhibited good heat storage capacity. Particularly, paraffins as solid‐liquid phase change materials have drawn huge numbers of attentions due to their characteristics of non‐toxicity, non‐corrosiveness, minimal supercooling, good stability and the ability of absorbing or releasing larger latent heat energy during melting or crystallizing 26‐30 . Unfortunately, paraffins used directly as heat storage medium have disadvantages of irregular morphology and leakage in liquid state.…”

Section: Introductionmentioning

confidence: 99%

Photo‐thermal conversion and heat storage characteristics of multi‐walled carbon nanotubes dispersed magnetic phase change microcapsules slurry

et al. 2020

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Summary The development of high‐efficient working fluids with excellent photo‐thermal conversion and heat storage properties is an important factor to solar thermal utilization. In this work, magnetic phase change microcapsules (MPCMs) were prepared via in situ polymerization, where melamine‐formaldehyde (MF) resin and octadecane containing oleic acid‐coated magnetic nanoparticles (OA‐MNs) were used as the shell and core, respectively. The microstructure, magnetic and thermal properties of MPCMs were investigated, and the photo‐thermal conversion and heat storage properties of slurries prepared by dispersing MPCMs into multi‐walled carbon nanotubes (MWCNTs) nanofluids were explored. The encapsulation efficiency of MPCMs with superparamagnetic nature achieved 63.51%, while the thermal conductivity of MPCMs was slightly increased with regard to phase change microcapsules (PCMs) and the thermal stability of octadecane was enhanced after being encapsulated. Moreover, the slurry with 0.01 wt% MWCNTs and 15 wt% MPCMs had the optimal photo‐thermal conversion properties and thermal storage capacity. Beyond that, the recycled MPCMs represented excellent recyclability. Our research demonstrated that the MWCNTs‐dispersed MPCMs slurry is one of ideal working fluids with excellent photo‐thermal conversion and heat storage characteristics for direct absorption solar collector.

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Optical and thermal performance of glazing units containing PCM in buildings: A review

Cited by 171 publications

References 142 publications

Operating Hardware Impact on the Heat Transfer Properties of Windows

Operating Hardware Impact on the Heat Transfer Properties of Windows

Dynamic modeling and performance assessment of single and double phase change material layer–integrated buildings in Mediterranean climate zone

Photo‐thermal conversion and heat storage characteristics of multi‐walled carbon nanotubes dispersed magnetic phase change microcapsules slurry

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