scholarly journals Building Envelope with Phase Change Materials

2019 ◽  
Author(s):  
Liu Yang ◽  
Yan Liu ◽  
Yuhao Qiao ◽  
Jiang Liu ◽  
Mengyuan Wang
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Building Envelope

scholarly journals Performance Assessment of Phase Change Materials Integrated with Building Envelope for Heating Application in Cold Locations

2021 ◽  
Vol 1 (1) ◽  
pp. 7-14
Author(s):  
Qudama M. Q. Al-Yasiri ◽  
Márta Szabó
Keyword(s):  
Phase Change ◽  
Energy Saving ◽  
Phase Change Materials ◽  
Renewable Energy Sources ◽  
Building Energy ◽  
Building Envelope ◽  
Cold Climates ◽  
Building Energy Saving ◽  
Energy Storage Applications ◽  
Heating Loads

Phase change materials (PCMs) are increasingly investigated in the last years as successful in many thermal energy storage applications. In the building sector, PCMs are utilised to improve building efficiency by reducing cooling/heating loads and promoting renewable energy sources, such as solar energy. This paper shows the recent research works on integrating PCMs with building envelope for heating purposes. The main PCM categories and their main characteristics are presented, focusing on PCM types applied for building heating applications. The main methods adopted to incorporate PCMs with building elements and materials are mentioned, and the popular passive and active incorporation techniques are discussed. Lastly, the main contribution to building energy saving is discussed in terms of heating applications. The analysed studies indicated that all PCMs could improve the building energy saving in the cold climates by up to 44.16% regardless of their types and techniques. Several conclusions and recommendations are derived from the analysed studies that are believed to be a guideline for further research.

scholarly journals Solar gain mitigation in ventilated tiled roofs by using phase change materials

2020 ◽  
Vol 15 (3) ◽  
pp. 434-442
Author(s):  
Michele Bottarelli ◽  
Francisco Javier González Gallero ◽  
Ismael Rodríguez Maestre ◽  
Gang Pei ◽  
Yuehong Su
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Building Energy ◽  
Energy Performance ◽  
Building Envelope ◽  
Dynamics Model ◽  
Night Time ◽  
Low Wind Speed ◽  
Cooling Design ◽  
Hot Season

Abstract Several passive cooling design techniques are known for reducing solar heat gain through building envelope in summer season. These include the use of phase change materials (PCM), which has received an increased attention over the last years, and the strategy of increasing the above-sheathing ventilation (ASV) in ventilated roofs. However, few studies combine both technologies to maximise the building resilience in hot season. The effect of including a PCM layer into a ventilated roof is numerically analysed here in two different configurations: firstly, laid on the roof deck (PCM1 case) and, secondly, suspended in the middle of the ASV channel (PCM2 case). A computational fluid dynamics model was implemented to simulate airflow and heat transfer around and through the building envelope, under 3 days of extreme hot conditions in summer with high temperatures and low wind speed. Results showed slight differences in terms of mean temperatures at the different roof layers, although temperature fluctuations at deck in the PCM1 case were smaller than half of those estimated for the benchmark case. However, PCM2 configuration achieved a daily reduction of about 10 Wh/m2 (18%) in building energy load with respect to the benchmark case, whilst PCM1 got only 4% due to the lower ventilation at night time. Therefore, a suspended PCM layer in the ASV channel would be a better measure in terms of energy performance than laid on the deck surface, although this last option significantly decreases thermal stress of the insulation layer.

scholarly journals Phase change materials (PCM) for building envelope applications: A review of numerical models

2019 ◽  
Author(s):  
José Henrique Nazzi Ehms ◽  
Rejane De Cesaro Oliveski ◽  
Luiz Alberto Oliveira Rocha ◽  
Cesare Biserni ◽  
Massimo Garai
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Numerical Models ◽  
Building Envelope

Energy saving potential of phase change materials-enhanced building envelope considering the six Moroccan climate zones

2021 ◽  
pp. 174425912110064
Author(s):  
Amal Louanate ◽  
Rabie El Otmani ◽  
Khalid Kandoussi ◽  
M’Hamed Boutaous ◽  
Daya Abdelmajid
Keyword(s):  
Phase Change ◽  
Energy Saving ◽  
Phase Change Materials ◽  
Residential Building ◽  
Energy Performance ◽  
Building Envelope ◽  
Climate Zone ◽  
Energy Saving Potential ◽  
Heat Penetration ◽  
El Jadida

Phase change materials (PCMs) show a good capability in absorbing massive heat when undergoing phase change, which have great potential to be incorporated into building envelopes to enhance indoor thermal comfort by preventing heat penetration into buildings and reducing energy requirements. In this work, a deep analysis of PCM enhanced-walls model has been conducted in six representative climate regions of Morocco: El Jadida, Fez, Marrakesh, Ifrane, and Errachidia. More in detail, numerical simulations were carried out to assess the thermal behavior and energy performance of a residential building integrated with four different PCMs. The results showed that the effectiveness and selection of PCMs strongly depend on local weather where they are applied, characteristics of HVAC systems, PCM layer thickness, and position. Furthermore, with reference to each climate zone, the appropriate PCM leading to the lowest annual energy consumption was identified. The findings show that PCMs are particularly suitable for Mediterranean climates, which a promising annual energy saving of about 41% was obtained. While, the lowest value was recorded in Errachidia city reveals that the integration of PCM has little effect in desert climate zone. As for the other climates considered, values of about 28% to 31% were achieved in the studied house model.

scholarly journals Evaluation of the Performance of a Building Envelope Constructed with Phase-Change Materials in Relation to Orientation in Different Climatic Regions

2019 ◽  
Vol 111 ◽  
pp. 04003
Author(s):  
Eda Köse ◽  
Gülten Manioğlu
Keyword(s):  
Energy Consumption ◽  
Phase Change ◽  
Phase Change Material ◽  
Phase Change Materials ◽  
Climatic Conditions ◽  
Building Envelope ◽  
Climatic Regions ◽  
Heating And Cooling ◽  
Energy Consumptions ◽  
Change Material

Minimizing the effect of climatic conditions and energy consumption in buildings are important issues to be considered in the building design process. Due to the changes in climatic conditions, there is an increase not only in the consumption of heating energy but also cooling energy. Certain passive measures to be taken primarily for the building envelope are necessary in order to reduce energy consumption. Applying a phase-change material on the surface of a building envelope is one of the new approaches for controlling heat transfer through the building envelope during the cooling period. It is known that phase-change materials, which are also considered as modern versions of thermal mass concept, can reduce the of a building’s heating and cooling energy consumption. In this study, a unit with 10m to 10m dimension with one external facade in a 3 storey building was evaluated in two cities, Istanbul and Diyarbakır, in temperate-humid and hot dry climatic regions. In order to reduce heating and cooling loads, a phase-change material was applied on the surface of the building envelope. The thickness of the phase-change material on the applied surface was increased at every step, and different building envelope alternatives were created. Heating and cooling energy consumptions were calculated for different orientations of the external facade. When calculated values are evaluated comparatively, it is seen that as the thickness of the phase-change material increases, the energy loads occurred in the unit decrease gradually. Equally, the performance of the phase-change materials varies depending on the orientation. Therefore, it is possible to determine the optimum thickness and orientation combination of the phase-change material application on a building envelope and reduce heating and cooling energy consumptions.

scholarly journals Numerical Study on Energy-Saving Performance of a New Type of Phase Change Material Room

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3874
Author(s):  
Rongda Ye ◽  
Xiaoming Fang ◽  
Zhengguo Zhang
Keyword(s):  
Energy Consumption ◽  
Energy Storage ◽  
Phase Change ◽  
Phase Change Materials ◽  
Numerical Study ◽  
Expanded Graphite ◽  
Building Envelope ◽  
The South ◽  
Ventilated Cavity ◽  
South Wall

The thermal performance of a phase change energy storage building envelope with the ventilated cavity was evaluated. CaCl2·6H2O-Mg(NO3)2·6H2O/expanded graphite (EG) was employed to combined with the building for year-round management. The energy consumption caused by the building under different influence parameters was evaluated numerically. The results indicated that CaCl2·6H2O-8wt %Mg(NO3)2·6H2O/EG should be installed on the south wall for the heating season, while CaCl2·6H2O-2wt %Mg(NO3)2·6H2O/EG should be integrated on the roof for the cooling season. When the air layer was ventilated and the south wall was coated with the solar absorbing coating, the room could save approximately 30% of energy consumption. Moreover, the energy consumption increased with an increase in the air layer thickness, and the air layers played a different role in the building envelope. The optimal value of the flow rate between air layer 2, air layer 3, and the room was 0.09 m3/s. To reduce the energy consumption, the phase change materials (PCMs) with large and small thermal conductivity should be installed in the south wall and roof, respectively. In general, the phase change energy storage building envelope with the ventilated cavity can save energy during the heating and cooling seasons.

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