Thermal Performance Optimization of Shape Stabilized Phase Change Material Used in Building Envelopes

2017 ◽  
Vol 744 ◽  
pp. 201-206
Author(s):  
Yin Zhang ◽  
Ming Shan Zhang
Keyword(s):  
Thermal Comfort ◽  
Phase Change ◽  
Performance Optimization ◽  
Optimization Design ◽  
Phase Change Materials ◽  
Transfer Model ◽  
Building Envelopes ◽  
Practical Applications ◽  
Indoor Thermal Comfort ◽  
Heating Loads

Integrating phase change materials (PCM) with building envelopes is an effective way to reduce the cooling or heating loads, improve indoor thermal comfort and save building energy consumptions. In this paper, the heat transfer model of building envelopes with shape stabilized PCM is established and the optimal phase change temperature and enthalpy of PCM for internal walls are determined. Moreover, different PCM locations in external walls are compared based on the evaluation index of integrated uncomfortable degree. The results shows that to improve indoor thermal comfort, it is preferable to put the PCM in the middle of external wall. It also indicates that the overall integrated uncomfortable degree in a whole year decreases with increasing thickness of the inserted shape stabilized PCM plate. This work is of great significance in guiding the optimization design of building envelopes with PCM for practical applications.

Improving indoor thermal comfort by using phase change materials: A review

2018 ◽  
Vol 42 (6) ◽  
pp. 2084-2103 ◽  
Author(s):  
Abuelnuor A. A. Abuelnuor ◽  
Adil A. M. Omara ◽  
Khalid M. Saqr ◽  
Ibrahim H. I. Elhag
Keyword(s):  
Thermal Comfort ◽  
Phase Change ◽  
Phase Change Materials ◽  
Indoor Thermal Comfort

scholarly journals Phase Change Materials for Reducing Cooling Energy Demand and Improving Indoor Comfort: A Step-by-Step Retrofit of a Mediterranean Educational Building

Energies ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3661 ◽  
Author(s):  
Fabrizio Ascione ◽  
Nicola Bianco ◽  
Rosa Francesca De Masi ◽  
Margherita Mastellone ◽  
Giuseppe Peter Vanoli
Keyword(s):  
Thermal Comfort ◽  
Phase Change ◽  
Melting Temperature ◽  
Thermal Insulation ◽  
Energy Demand ◽  
Phase Change Materials ◽  
Cool Roof ◽  
Indoor Thermal Comfort ◽  
Innovative Solutions ◽  
Indoor Comfort

The present work concerns the energy retrofit of a public educational building at the University of Molise, located in Termoli, South Italy. The study provides a comparison of the results obtained by different dynamic simulations of passive strategies to improve thermal comfort and energy behavior of the building during the summer regime. Firstly, the building model was calibrated against historical consumption data. Then, a subsequent step involves the technical-economic analysis, by means of building performance simulations, of energy upgrading scenarios, specifically, cool roof and green roof technologies for the horizontal opaque envelope and thermal insulation, vented façade, and phase change materials’ applications for the vertical opaque envelope. Improving the indoor thermal comfort and reducing the thermal energy demand during summertime through innovative solutions will be the primary objective of the present study. The energy efficiency measures are compared from the energy, emissions, costs, and indoor comfort points of view. Phase Change Materials applied to the inner side of the external walls are analyzed in depth and, by varying their melting temperature, optimization of design is performed too. This innovative material, with a melting temperature of 23 °C and a freezing temperature of 21 °C, determines the reduction of summer energy consumption of 11.7% and the increase of summer indoor comfort of 215 h. Even if consolidated, other solutions, like the cool roof, green roof, thermal insulation, and vented façade induce improvements in terms of summer energy saving, and the percentage difference compared to the basic building is less than 2%. For this case study, a Mediterranean building, with construction characteristics typical of the 1990s, traditional passive technologies are not very efficient in improving the energy performance, so the investigation focused on the adoption of innovative solutions such as PCMs, for reducing summer energy demand and improving indoor thermal comfort.

scholarly journals The potential of phase change materials in mitigating cooling load of buildings in UAE

2019 ◽  
Author(s):  
Yasir Rashid ◽  
Mohammed Ziauddin ◽  
Bobby Mathew ◽  
Fadi Alnaimat
Keyword(s):  
Thermal Comfort ◽  
Phase Change ◽  
Energy Saving ◽  
United Arab Emirates ◽  
Phase Change Materials ◽  
Temperature Drop ◽  
Experimental Studies ◽  
High Heat ◽  
High Heat Flux ◽  
Indoor Thermal Comfort

Abstract Integration of phase change materials (PCM) into building elements is explored extensively in the last decade to reduce air-conditioning demand for indoor thermal comfort. The PCM could absorb and release thermal energy as latent heat in a narrow temperature range. Several experimental studies reported energy saving and indoor temperature drop in summer conditions. However, the matter is sparsely researched in the environment of the United Arab Emirates (UAE), a region of high heat flux throughout the year. The current research provides an overview of the integration of PCM in buildings for indoor thermal comfort and energy saving in the UAE. The research highlights the problems of building-integrated photovoltaics (BIPV), e.g. efficiency drop. The significance of the PCM application in the built environment and its research gap is highlighted by reporting all the previous findings on the topic including the application of PCM in glazing, concrete and BIPV.

scholarly journals Thermal performance analysis of a residential house equipped with Phase Change Material

2019 ◽  
Vol 128 ◽  
pp. 05004
Author(s):  
Ayoub GOUNNI ◽  
Hasna LOUAHLIA
Keyword(s):  
Thermal Comfort ◽  
Phase Change ◽  
Thermal Performance ◽  
Phase Change Materials ◽  
Thermal Inertia ◽  
Reference Case ◽  
Remarkable Effect ◽  
Residential House ◽  
Heating Loads ◽  
Indoor Comfort

In the objective to enhance the thermal inertia of the light envelopes, the integration of the phase change materials in these envelopes is suggested. This work reports the results of a numerical studyto qualitatively and quantitatively investigate the thermal performance of a residential house built in France and equipped with Phase Change Materials. The impacts of Phase Change Materials (PCMs) equipped in a residential house on heating loads and the indoor comfort are analyzed by means of dynamic simulation using TRNSYS software. Thermal performance of the PCMs are assessed by comparison to a reference case identical to the PCM house but without the PCM layer. The results show that the PCMs have a remarkable effect on the indoor air temperature, thermal comfort and thermal load of the house comparedto the reference house. The integration of the PCMs to the building, leads to better thermal comfort conditions compared to the conventional case. A reduction of 52.28 kWh/m2/an is reached when integrating the PCM layer.

Sodium acetate–urea composite phase change material used in building envelopes for thermal insulation

2017 ◽  
Vol 39 (4) ◽  
pp. 475-491 ◽  
Author(s):  
Yin Zhang ◽  
Xin Wang ◽  
Zhiyuan Wei ◽  
Yinping Zhang ◽  
Ya Feng
Keyword(s):  
Energy Consumption ◽  
Thermal Comfort ◽  
Phase Change ◽  
Phase Change Material ◽  
Thermal Insulation ◽  
Sodium Acetate ◽  
Building Envelopes ◽  
Indoor Thermal Comfort ◽  
Composite Phase Change Material ◽  
Change Material

Integrating phase change material with building envelopes is an effective way to reduce cooling or heating loads, improve indoor thermal comfort and save building energy consumption. In this paper, the composite phase change material of sodium acetate and urea is prepared and its thermal–physical properties with different mixing mass ratios are investigated through experiment and T-history method. Moreover, the heat transfer model of building envelopes with phase change material is established and different phase change material locations in external walls for thermal insulation are compared based on integrated uncomfortable degree. The results show that (1) with rising urea mass fraction, both phase change temperature and latent fusion heat (enthalpy) decline; (2) strontium sulfate is an effective nucleating additive to decrease super-cooling degree for such phase change material solidification and (3) to improve indoor thermal comfort, it is preferable to put phase change material in the middle of external walls. Furthermore, the illustrative example of an office building in Chengdu indicates that phase change material insulation can lead to time lag and decrement for indoor air temperature variations. It also indicates that after inserting such phase change material into building external wall, the highest indoor temperature can be decreased by 7℃, leading to 60% cooling energy saving in one typical summer day. This work can provide guidance for building thermal design with phase change materials. Practical application:The studied sodium acetate–urea composite phase change material has been used as energy storage and thermal insulation materials inserted in envelopes for the demonstration project of low/zero energy consumption passive buildings in China.

scholarly journals Phase Change Materials for building envelopes in Reunion Island, France

2021 ◽  
Vol 2042 (1) ◽  
pp. 012183
Author(s):  
L. Trovalet ◽  
L. Liu ◽  
D. Bigot ◽  
B. Malet-Damour
Keyword(s):  
Thermal Behavior ◽  
Thermal Comfort ◽  
Phase Change ◽  
Phase Change Materials ◽  
Thermal Simulation ◽  
Reunion Island ◽  
Building Envelopes ◽  
Test Room ◽  
Réunion Island ◽  
Numerical Approaches

Abstract This study is being conducted to evaluate the effects of Phase Change Materials (PCM) on thermal comfort in buildings in Reunion Island. Experimental and numerical approaches are used to determine the criteria for the integration of bio-based PCM. A full-scale platform is divided into two rooms, where a layer of PCM is applied to one surface of the test room. Results show that the application of PCM delays the temperature rises and its maximum is reduced by up to 4 degrees. Finally, the experimental results are compared to those of a Dynamic Thermal Simulation (DTS) program to evaluate the ability of such programs to predict the thermal behavior of the building with and without PCM.

scholarly journals Modeling and Simulation of Phase Change Material Wallboards to Improve Indoor Thermal Comfort: A Case Study of Residential Buildings of urban village in Guangzhou

2021 ◽  
Vol 294 ◽  
pp. 04002
Author(s):  
Kunlun Li
Keyword(s):  
Thermal Comfort ◽  
Phase Change ◽  
Phase Change Material ◽  
Phase Change Materials ◽  
Residential Buildings ◽  
Positive Influence ◽  
Finite Element Software ◽  
Urban Village ◽  
Indoor Thermal Comfort ◽  
Change Material

Phase change materials can not only save thermal storage, but also improve residential thermal comfort. In this paper, the finite element software COMSOL is used to simulate the effect of phase change material wallboards on the improvement of residential comfort in the urban village of Guangzhou, China. The results clearly show that the use of phase change material wallboards has a positive influence on the indoor thermal comfort of the urban village.

scholarly journals Thermal Dynamic Behavior in Bi-Zone Habitable Cell with and without Phase Change Materials

Proceedings ◽  
2020 ◽  
Vol 63 (1) ◽  
pp. 41
Author(s):  
Hanae El Fakiri ◽  
Lahoucine Ouhsaine ◽  
Abdelmajid El Bouardi
Keyword(s):  
Thermal Behavior ◽  
Thermal Comfort ◽  
Phase Change ◽  
Dynamic Behavior ◽  
Phase Change Materials ◽  
Energy Performance ◽  
High Energy ◽  
Water Heater ◽  
Simplified Modeling

The thermal dynamic behavior of buildings represents an important aspect of the energy efficiency and thermal comfort of the indoor environment. For this, phase change material (PCM) wallboards integrated into building envelopes play an important role in stabilizing the temperature of the human comfort condition. This article provides an assessment of the thermal behavior of a “bi-zone” building cell, which was built based on high-energy performance (HEP) standards and heated by a solar water heater system through a hydronic circuit. The current study is based on studying the dynamic thermal behavior, with and without implantation of PCMs on envelope structure, using a simplified modeling approach. The evolution of the average air temperature was first evaluated as a major indicator of thermal comfort. Then, an evaluation of the thermal behavior’s dynamic profile was carried out in this study, which allowed for the determination of the PCM rate anticipation in the thermal comfort of the building cell.

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