Simple thermal evaluation of building envelopes containing phase change materials using a modified admittance method

Thiele, Alexander M.; Liggett, Robin; Sant, Gaurav; Pilon, Laurent

doi:10.1016/j.enbuild.2017.03.046

Cited by 24 publications

(10 citation statements)

References 29 publications

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“…Figures. [13][14][15][16] showed the variation of percentage of cooling load reduction as a result of using PCM for different studied cases compared with cooling load for standard room. It is important to mention that the tests for different cases of PCM were carried out at different times due to preparation requirements.…”

Section: Cooling Loads (C L): (Jun and July-2019)mentioning

confidence: 99%

“…The effect of thermal control of construction fabrics integrated with PCM in periods of extreme heat waves was previously numerically examined and the result showed that the risks of internal thermal stress can be effectively reduced without the air conditioner function [13]. A researched numerical model based on a modified acceptance model to assess the thermal performance of building conditions that are integrated with PCM and whose result converts to good compatibility with current finite element simulation results [14]. A new double walled PCM board structure was introduced, and a related simplified dynamic model was proposed, and then used to analyze the energy performance of the commercial building under various conditions.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of an energy saving system using Phase Change Materials in buildings

et al. 2020

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In this paper, an experimental research has been conducted intended for using Phase Change Materials (PCM) by incorporating it with the building layers walls. The effect of involving PCM volume ratio and orientation on the thermal efficiency and thermal comfort was experimentally studied. Two identical rooms models have been constructed. The first model was used as a standard room as a reference one without using PCM and the second model has the PCM layers and used for all experimental testing works. Both rooms are installed at National Research Center, NRC, Giza, 30.08 °N latitude, Egypt. The PCM used in this experimental work was paraffin wax having a melting point 29 °C. Many cases have been studied based on south wall, east wall and west wall respectively. It was found that using PCM caused a considerable reduction in the indoor air temperature and consequently reduction in the cooling load that minimize the building energy consumed. It is concluded that the Percentage of the cooling load reduction of the zone by using PCM and according to cases and for peak hour in day was 19.2% with PCM for East, West and South walls together, followed by 16.8 % for South wall only, followed by 12.7% with West wall only and followed by 10.5% for East wall only. It is found that the best case in cooling load reduction of the room for peak hour of PCM for South, West and East walls together by 19.2%. The experimental results of the present study were validated with the corresponding experimental study of Mushtaq 2018 with a considerable agreement between the daily cooling load reduction per space volume and the cooling load reduction ratio. It is known that the cooling load reduction ratio is referred to the energy saving which proved that using PCM in building will contribute in energy saving in residential building.

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Section: Cooling Loads (C L): (Jun and July-2019)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental investigation of an energy saving system using Phase Change Materials in buildings

et al. 2020

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“…The result shows that the indoor heat stress risks can be reduced effectively without the function of an air conditioner. Meanwhile, Thiele et al [17] constructed a numerical model based on a modified admittance model to evaluate the thermal performance of building envelops integrated with PCM whose result turns to agree well with that of the existing finite element simulations. Zhu et al [18,19] put forward a new structure of wallboards with double shape-stabilized PCM, proposed a related simplified dynamic model, and then used it to analyze energy performance of office building under different conditions.…”

Section: Introductionmentioning

confidence: 55%

A Parametric Investigation on Energy-Saving Effect of Solar Building Based on Double Phase Change Material Layer Wallboard

Tong

Xiong

2018

International Journal of Photoenergy

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In order to further understand the thermal performance of the double phase change material (PCM) layer wallboard, the wallboard model was established and a comprehensively numerical parametric investigation was carried out. The variation laws of inner wall temperature rise and the heat flux transferred under different phase transition temperatures and thermal conductivities are presented in detail. The main results show that the temperature of the inside wall for case 2 can be reduced by about 1.5 K further compared to that for case 1. About 83% of the heat transferred from the outside is absorbed by the PCM layer in case 2. Reducing the phase transition temperature of the PCM layer can decrease the inside wall temperature to a certain extent in the period of high temperature. The utilization of double PCM layers shows much more performance compared to that of the single PCM layer case, and the temperature of the inside wall can be reduced by 2 K further.

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“…This is achieved by considering previous heat gains with the use of radiant time factors [15]. The CIBSE admittance method is similar, as the first calculation establishes the sensible steady-state heat gains, followed by a cyclic variation that takes into consideration the building fabric properties; an hourly thermal model can then be created due to the incorporation of coefficient and response factors [16]. However, as mentioned earlier, the ASHRAE RTS method combines radiation and convection heat transfer, which does not accommodate for conduction from the internal environment, which thereby results in overpredictions [13].…”

Section: Cibse and Ashrae Cooling Load Calculation Methodsmentioning

confidence: 99%

Comparative Analysis of CIBSE Admittance and ASHRAE Radiant Time Series Cooling Load Models

et al. 2022

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Due to the impacts of carbon emissions on climate change and the expected dramatic increase in global cooling demand by 2050, it is of a paramount importance that the required energy to cool buildings is accurately predicted. This ensures that equipment is appropriately sized, which ultimately reduces energy consumption and global carbon emissions. CIBSE and ASHRAE standards are both widely adopted for cooling load predictions, but they adopt different calculation methods, with CIBSE adopting admittance and ASHRAE adopting radiant time series (RTS), which produce significantly different results in cooling load. This study comparatively and qualitatively evaluates the CIBSE admittance and ASHRAE RTS cooling load models by analysing their structures and key input parameters for a mock-up building to identify inconsistencies between the two methods. There were flaws within both models that resulted in the CIBSE method underpredicting the cooling load, whereas the ASHRAE method typically overpredicting it. This resulted in a maximal average difference of over 60%. The substantial predicted cooling load difference was mainly caused by the ASHRAE RTS model, which was highly receptive to solar gains, and it consequently led to overprediction in cooling load when compared to the CIBSE admittance model.

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Simple thermal evaluation of building envelopes containing phase change materials using a modified admittance method

Cited by 24 publications

References 29 publications

Experimental investigation of an energy saving system using Phase Change Materials in buildings

Experimental investigation of an energy saving system using Phase Change Materials in buildings

A Parametric Investigation on Energy-Saving Effect of Solar Building Based on Double Phase Change Material Layer Wallboard

Comparative Analysis of CIBSE Admittance and ASHRAE Radiant Time Series Cooling Load Models

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