Numerical analysis for the optimal location of a thin PCM layer in frame walls

Jin, Xing; Medina, Mario A.; Zhang, Xiaosong

doi:10.1016/j.applthermaleng.2016.04.056

Cited by 170 publications

(42 citation statements)

References 21 publications

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“…It might vary from 5°C to 35 °C for different seasons, wall orientations and locations of the PCM layer. The optimal location of a thin PCM layer wallboard was estimated numerically by Jin et al [87,88].…”

Section: Numerical Studies For Building Wallsmentioning

confidence: 99%

A review on applications of shape-stabilized phase change materials embedded in building enclosure in recent ten years

Zhu

et al. 2018

Sustainable Cities and Society

108

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Phase change material (PCM) elements in buildings as effective thermal energy storage technologies could decrease indoor temperature swings and lower building cooling/heating loads due to their great latent heat and proper thermal conductivity. Shape-stabilized phase change materials (SSPCMs) attracted interest of many researchers due to their outstanding ability of keeping shape for long-term multiple thermal cycles with no need of encapsulation. A summarize on thermal dynamic characteristic and thermal performance of buildings integrated with SSPCMs is important for us to gain a better understand on their performance and energy saving potential in both active and passive buildings. This study has reviewed applications of SSPCMs embedded in building enclosure in recent ten years (2008-2018). Both numerical and experimental research works on integrating SSPCMs into building envelope components, such as walls, floor, roof and windows, were reviewed, respectively. A thorough conclusion about this review work and appropriate recommendations for further studies were presented at the end of the paper. This review work will help both researchers and engineers to capture up-to-date uses of SSPCMs to achieve energy efficient buildings.

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Section: Numerical Studies For Building Wallsmentioning

confidence: 99%

A review on applications of shape-stabilized phase change materials embedded in building enclosure in recent ten years

Zhu

et al. 2018

Sustainable Cities and Society

108

View full text Add to dashboard Cite

show abstract

“…It was found that an optimum location for PCM placement existed in terms of different thermal resistances between the PCM layers and the external thermal boundary conditions. Jin numerically optimized the location of the PCM layer under different parametric conditions by validating their model with experiments conducted using a dynamic wall insulator [10]. They presented that the optimum PCM layer location approaches the exterior surface of the wall when the melting temperature and the latent heat of PCMs were increased.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Energy Saving Characteristic in Building Roof Coupled with PCM Using Lattice Boltzmann Method with Economic Analysis

Shao

Ren

2018

Applied Sciences

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Featured Application: The current work has potential applications in economically designing green buildings in the summer hot and winter cold region of China.Abstract: Due to their characteristics of high energy storage density and a nearly constant melting temperature, phase change materials (PCMs) could be inserted into the roof of green buildings in order to reduce the energy consumption and ameliorate the room thermal comfort. In this paper, an enthalpy based multiple-relaxation-time (MRT) lattice Boltzmann method (LBM) was developed to calculate the transient phase change conjugate heat transfer with solar radiation inside the green building's PCM roof in the hot summer and cold winter areas of China. The effect of the PCM melting temperature on the variation of the roof internal temperature was investigated and the energy saving characteristic of the PCM roof under an intermittent energy utilization condition was also analyzed by comparing with the performance of the roof filled with sensible insulating materials (SIMs). Then, the life cycle incremental costs and incremental benefits of a PCM roof and SIM roof were studied by using the comprehensive incremental benefit model so that the green building roof could be economically evaluated. The results indicate that a temperature rise inside the roof during summer cooling time could be delayed due to the latent heat of the PCMs. It was also found that the melting temperature and the thickness of the PCM layer should be chosen appropriately for enhancing the energy saving amount of a PCM roof. Based on this, the PCM roof could have a better energy saving capability than the SIM roof. During the winter heating time, as the environment temperature and the room temperature are both below the PCM melting temperature, the PCM roof does not have a latent heat characteristic so that it performs like a SIM roof. Furthermore, due to the high price of PCMs, the incremental cost of green building is increased, which makes the PCM roof have a negative comprehensive incremental benefit. Under this circumstance, developing PCMs with a low price and stable chemical properties is a key scientific bottleneck for a wider application of PCM roofs in the architecture engineering field.

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“…The proper location of the PCM in the structural components is a critical issue, and it determines the performance enhancement margins. In the literature, different locations for the PCM layer have been examined, for example, close to the exterior wall surface [7], close to the interior wall surface [8] and close to the intermediate insulation layer [9].…”

Section: Introductionmentioning

confidence: 99%

Thermal Behavior of a Building with Incorporated Phase Change Materials in the South and the North Wall

et al. 2018

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Energy consumption in the building sector is responsible for a very large amount of electricity consumption worldwide. The reduction of this consumption is a crucial issue in order to achieve sustainability. The objective of this work is to investigate the use of phase change materials (PCMs) in the building walls in order to reduce the heating and the cooling loads. The novelty of this work is based on the investigation of different scenarios about the position of the PCM layer in the south and the north walls. PCMs can improve the thermal performance and the thermal comfort of a building due to their ability to store large amounts of thermal energy in latent form and so to reduce the temperature fluctuations of the structural components, keeping them within the desired temperature levels. More specifically, this work presents and compares the heating loads, the cooling loads and the temperature distribution of a building in Athens (Greece), with and without PCMs in different positions in the south wall and in the north walls. The simulation is performed with the commercial software TRNSYS 17, using the TRNSYS component: type 1270 (PCM Wall). The results proved that the maximum energy savings per year were achieved by the combination of the insulation and the PCM layer in the north and south walls. More specifically, the reductions in the heating and the cooling loads were found to be 1.54% and 5.90%, respectively. Furthermore, the temperature distribution with the use of a PCM layer is the most acceptable, especially during the summer period.

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Numerical analysis for the optimal location of a thin PCM layer in frame walls

Cited by 170 publications

References 21 publications

A review on applications of shape-stabilized phase change materials embedded in building enclosure in recent ten years

A review on applications of shape-stabilized phase change materials embedded in building enclosure in recent ten years

Numerical Investigation of Energy Saving Characteristic in Building Roof Coupled with PCM Using Lattice Boltzmann Method with Economic Analysis

Thermal Behavior of a Building with Incorporated Phase Change Materials in the South and the North Wall

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