Experimental and numerical investigation of PCM capsules as insulation materials inserted into a hollow brick wall

Abbas, Hayder M.; Jalil, Jalal M.; Ahmed, Sabah T.

doi:10.1016/j.enbuild.2021.111127

Cited by 60 publications

(17 citation statements)

References 45 publications

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“…They key determent factor in selecting the most adequate PCM type is the phase transition temperature. According to (Abbas et al, 2021), it should be matched with the operating temperature. Meaning that the PCM solidification temperature is desired to be higher than the nighttime ambient temperature in summer months.…”

Section: Phase Change Materials Propertiesmentioning

confidence: 99%

مراجعة على التقييم الاقتصادي لدمج المواد المغلفة متغيرة الطور في أغلفة المباني

Ahmed,

Elgohary,

Nessim

2024

Journal of Engineering Sciences and Information Technology

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The worldwide energy crisis has made energy-saving a topic of concern in almost every country. Previous research has explored the use of thermal energy storage materials (TES), such as phase change materials (PCMs), as an effective energy-saving technique. Among various immersion techniques, macro-encapsulation has proven to be efficient, safe, and convenient. However, choosing the right PCM system can be complicated due to the variety of available PCM types, encapsulation materials, and encapsulation shapes. Moreover, while macro-encapsulated PCM systems are efficient, their feasibility depends on several factors, including energy prices, economic situation, and climatic conditions. Therefore, this research aims to provide a comprehensive overview to help create a deeper understanding of the design and application of macro-encapsulated PCM systems. It explains the different types of PCM, encapsulation materials, and encapsulation shapes, guiding the selection for the most appropriate system regarding the surrounding environment. Additionally, it aims to present a guideline for conducting feasibility studies on energy-saving systems such as PCM. A total of 80 research papers covering the intersection between the thermal performance of PCM and the economic assessment have been categorized, studied, and analyzed in order to identify the most accurate method of assessing the system’s feasibility. By providing a base knowledge regarding the various types of each element of the system and the factors that govern the selection of each, this research will help engineers appropriately design the system. In addition, providing a detailed guideline to the assessment of the system shall aid the decision makers in determining the system’s feasibility which encourages its application. Finally, the research investigates and addresses the key issues for future studies.

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Section: Phase Change Materials Propertiesmentioning

confidence: 99%

مراجعة على التقييم الاقتصادي لدمج المواد المغلفة متغيرة الطور في أغلفة المباني

Ahmed,

Elgohary,

Nessim

2024

Journal of Engineering Sciences and Information Technology

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“…For each phase, specific heat is constant and the change of phase take place at a single temperature [22,23].…”

Section: Wall With Paraffin Waxmentioning

confidence: 99%

Thermal performance of wax Trombe wall

Salih

Ayaal

2022

J Appl Eng Science

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Using solar energy to cover heating loads of building is a clean and unconventional way that can help reduce electricity consumption. Problems of the cost of energy and environmental pollution are among the most important challenges facing humanity at the present time. And as most of the energy is used for heating and ventilation, thus the need to find renewable sources of energy has become a pressing need. In this direction Trombe wall, which is a classical passive solar wall, has become one of the most important heating and ventilation technologies of buildings. In the present work a three-dimensional numerical study of thermal energy performance for Trombe wall utilizing paraffin wax as PCM was presented. The effect of PCM thickness was studied as (2, 3, 4 and 5 cm). A FORTRAN-90 computer program was built to solve a three-dimensional, turbulent Navier stokes and energy equations in addition to enthalpy transforming method for PCM with explicit scheme based on finite volume method. Numerical results of the present code were validated by comparing them with previous experimental results and a good agreement was noted. The results show that a 2 cm thick PCM is an optimal thickness, where the percentage rates of increasing in air temperature over ambient temperature at day hours (10 am, 12 pm, 5 pm, 10 pm and 7 am of the next day) were (37.8, 19.5, 30.7, 60 and 69.2%) respectively, compared to (33.5, 15.2, 25.9, 53.3 and 65.3) % respectively for a 5 cm wax calculated at the same hours.

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“…Two similar rooms were conceived and built to test two southern walls with and without PCM in their natural outside environment. The results reveal that encapsulating PCM in the treated wall reduces the inner surface wall and room temperature by approximately 4.7°°C while increasing the time lag by 2 h [1].…”

Section: Introductionmentioning

confidence: 96%

Implementation of phase change material for cooling load reduction: a case study for Cairo, Egypt

Kamel

Mina

Elsabbagh

2022

Int. J. Air-Cond. Ref.

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Integrating a phase change material (PCM) into building envelopes can reduce energy needs in the built environment, and the consequent greenhouse emissions. This research examines the impact of PCM integrated into a traditional wall in Egypt on peak and average cooling energy consumption. A MATLAB code based on the finite volume technique using the Crank-Nicolson method for discretization is implemented. Several benchmark cases and experimental results validate the code. The time-dependent boundary conditions of the cases examined were based on the irradiance and ambient temperatures measured in Cairo, Egypt. Simulations are performed on eight different PCMs, using their real published DSC curve. The study aims to investigate the performance of each PCM at different positions, thicknesses, and wall orientations. The calculations revealed that using the proper PCM type and the proper position could decrease the average by 38.14%, Also the peak heat flux could be decreased by 58.53%.

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Experimental and numerical investigation of PCM capsules as insulation materials inserted into a hollow brick wall

Cited by 60 publications

References 45 publications

مراجعة على التقييم الاقتصادي لدمج المواد المغلفة متغيرة الطور في أغلفة المباني

مراجعة على التقييم الاقتصادي لدمج المواد المغلفة متغيرة الطور في أغلفة المباني

Thermal performance of wax Trombe wall

Implementation of phase change material for cooling load reduction: a case study for Cairo, Egypt

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