Adjustment of thermal behavior by changing the shape of PCM inclusions in concrete blocks

Erlbeck, L.; Schreiner, Philipp; Schlachter, K.; Dörnhofer, Patrick; Fasel, F.; Methner, Frank‐Jürgen; Rädle, Matthias

doi:10.1016/j.enconman.2017.12.073

Cited by 63 publications

(18 citation statements)

References 18 publications

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“…The effect of the design of macro-encapsulation on the heat transfer performance is mostly analyzed by numerical analysis with only a few experimental studies available in the literature, highlighting a research gap. Amongst the experimental studies available, Erlbeck et al [28] and Al-Yasiri and Szabó [29] experimentally investigated the thermal behavior of concrete blocks with different shapes of microencapsulated PCM. Ismair and Moraes [30] numerically and experimentally evaluated spherical containers made with different geometries and materials and filled with PCM for cold storage domestic applications.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Two PCM Macro-Encapsulation Designs in a Thermal Energy Storage Tank

et al. 2021

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The use of latent heat thermal energy storage is an effective way to increase the efficiency of energy systems due to its high energy density compared with sensible heat storage systems. The design of the storage material encapsulation is one of the key parameters that critically affect the heat transfer in charging/discharging of the storage system. To fill the gap found in the literature, this paper experimentally investigates the effect of the macro-encapsulation design on the performance of a lab-scale thermal energy storage tank. Two rectangular slabs with the same length and width but different thickness (35 mm and 17 mm) filled with commercial phase change material were used. The results show that using thinner slabs achieved a higher power, leading to a reduction in the charging and discharging time of 14% and 30%, respectively, compared with the thicker slabs. Moreover, the variation of the heat transfer fluid flow rate has a deeper impact on the temperature distribution and the energy charged/released when thicker slabs were used. The macro-encapsulation design did not have a significant impact on the discharging efficiency of the tank, which was around 85% for the operating thresholds considered in this study.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Two PCM Macro-Encapsulation Designs in a Thermal Energy Storage Tank

et al. 2021

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“…M2 and M3 registered 50% and 80%, respectively, heat transmission reduction compared to the reference. Another experiment used 10 samples with different shapes of an integrated PCM in concrete blocks to determine its thermal behavior [24]. The 10 samples, including the reference block, included PCMs with different amounts in two blocks of cuboid shape, two of cylindrical shape, four of plate shape, and one of spherical shape.…”

Section: Introductionmentioning

confidence: 99%

Using Phase Change Materials (PCMs) in a Hot and Humid Climate to Reduce Heat Gain and Energy Consumption

et al. 2021

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Twenty percent of the world’s energy is consumed by the construction sector, including commercial and residential buildings, where 13% is consumed by the residential sector only. Half of the total energy consumed by buildings in Saudi Arabia is specifically attributed to the hot summer season, which, unlike in many other countries in the Middle East, continues for more than 5 months annually. The use of a phase change material (PCM), as an insulator in building materials, can be a solution to provide a comfortable indoor temperature and reduce energy consumption. This study examined two different melting ranges for PCMs RT35 and RT35HC inserted into hollow clay bricks to investigate their thermal behavior and heat storage capacity and compare them with polystyrene foam. To perform this experiment, four chambers were constructed using cement plastering. The data were collected at Jeddah, Saudi Arabia, from mid-November 2020 to the end of February 2021. When the highest temperature was reached during the experiment, PCM RT35 provided a better cooling effect by 13% compared to 24% and 28.56% for PCM RT35HC and foam, respectively, compared to hollow bricks alone. However, when the lowest temperature was reached during the experiment, PCM RT35HC performed better than the other chambers in saving energy and keeping the chamber warm, which was 9.5% for the reference chamber, 7.0% for the foam chamber, and 2.8% for PCM RT35. The maximum energy saving of PCM RT35 was around 1920 kJ, which is around 0.533 kWh, for one wall only, and for PCM RT35HC, it was 2880 kJ, or 0.8 kWh, which can reduce energy consumption of the HVAC system by 97 kWh/m2 and 146 kWh/m2 per year, respectively.

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“…In addition to those predictable models to study the energy-saving effects of PCM as the passive thermal control applied in buildings, many other studies have investigated the thermal behavior of the PCM layer used for building. For example, Erlbeck et al [8] experimentally investigated the thermal behavior of encapsulated PCM with different shapes embedded in a concrete block. Recently, Dardir et al [9] comprehensively reviewed the progress on the application of PCM as passive thermal control devices in the air heat exchangers of free cooling buildings.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, there are several other honeycomb cores with various geometrical shapes, such as diamonds, rectangles, bubbles, and circles [27]. In fact, according to the studies of Erlbeck et al [8] and Liu et al [25], PCM in encapsulated shells with different Energies 2019, 12, 2920 3 of 19 geometrical shapes could acquire different melting rates. Raj et al [30] indicated that the melting rate of PCM in metallic cylinder encapsulates was different from PCM in rectangular encapsulates.…”

Section: Introductionmentioning

confidence: 99%

Melting Behavior of Phase Change Material in Honeycomb Structures with Different Geometrical Cores

2019

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Honeycomb structure with phase change material (PCM) is frequently used in passive thermal management devices. The geometrical shape of the honeycomb core greatly influences the melting rate of the PCM. This paper investigates the melting rates of PCM in honeycomb cores of non-hexagonal cells in comparison with that of hexagonal cell in three Rayleigh numbers. The objective is to find the optimal shape in order to reduce the melting time of the PCM. The constrained melting behaviors of PCM in triangular, quadrilateral, hexagonal, and circular honeycomb cores are numerically studied. The enthalpy porosity technique and finite volume method are used in this paper. The instantaneous liquid fraction and energy absorption of PCM in different honeycomb cores are discussed in detail. The influences of the placed orientation and aspect ratio of different cores on melting rates of PCM are considered. Results show that the melting rate of PCM in a rectangular core is always higher than the hexagonal core for the given aspect ratio and Rayleigh number. The geometrical factor (GF), which indicates the cross-sectional area per unit perimeter, is found to be an important index on the melting rate. At a small Rayleigh number, it takes a longer melting time of the PCM for the core with a larger GF. As the Rayleigh number is large, the melting time of the PCM is affected by both the GF and the orientation of the cores.

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Adjustment of thermal behavior by changing the shape of PCM inclusions in concrete blocks

Cited by 63 publications

References 18 publications

Experimental Study on Two PCM Macro-Encapsulation Designs in a Thermal Energy Storage Tank

Experimental Study on Two PCM Macro-Encapsulation Designs in a Thermal Energy Storage Tank

Using Phase Change Materials (PCMs) in a Hot and Humid Climate to Reduce Heat Gain and Energy Consumption

Melting Behavior of Phase Change Material in Honeycomb Structures with Different Geometrical Cores

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