scholarly journals Thermal Performance of Hollow-Core Slab Ventilation System with Macro-Encapsulated Phase-Change Materials in Supply Air Duct

Buildings ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 51 ◽  
Author(s):  
Hasnat Jamil ◽  
Morshed Alam ◽  
Jay Sanjayan
Keyword(s):  
Phase Change ◽  
Temperature Fluctuation ◽  
Phase Change Materials ◽  
Concrete Slab ◽  
Ventilation System ◽  
Individual Performance ◽  
Thermal Mass ◽  
Inlet Temperature ◽  
Hollow Core ◽  
Hollow Core Slab

The aim of this research was to evaluate the effectiveness of phase-change materials (PCMs) incorporated into the supply air duct of a hollow-core slab ventilation system. Both experimental and numerical approaches were adopted in this investigation. In the experimental work, the air was passed through a PCM-incorporated aluminum air duct, and the temperature at various points of the duct was recorded. Computational fluid dynamics models of the PCM-incorporated supply air duct and the hollow-core slab were developed and validated with the respective experimental data. The validated models were used to simulate the performance of PCM-incorporated hollow-core slabs during summer in Melbourne, Australia. The results showed that the reduction in temperature fluctuation varied with the way the PCM was incorporated inside the supply air duct. The temperature difference was maximum and was maintained for a longer period when the PCM was spread to all four internal surfaces of the supply air duct. The results also showed that the effectiveness of the combined PCM–air duct–hollow-core slab system in reducing the temperature fluctuation was lower than the individual performance of the PCM–air duct and hollow-core concrete slab for a given inlet temperature condition during the simulated period. This was because the integration of PCMs in the supply air duct resulted in a precooling effect which reduced the difference between the amplitude of slab inlet temperature swing and average slab temperature. As a result, the reduction in temperature fluctuation due to the thermal mass of the hollow-core slab was 21% lower in the presence of PCMs compared to the no-PCM case.

scholarly journals Thermo-physical characteristics of building integrated phase change materials (PCM) and their applicability to energy efficient homes

2021 ◽  
Author(s):  
Omar Siddiqui
Keyword(s):  
Compressive Strength ◽  
Phase Change ◽  
Phase Change Materials ◽  
Energy Savings ◽  
Physical Characteristics ◽  
Comfort Level ◽  
Thermal Mass ◽  
Lower Phase ◽  
Physical Test ◽  
The Impact

The applicability of utilizing a variety of thermal mass including phase change materials with commonly used building materials is investigated through the use of simulations and physical testing. The thermal performance and occupant comfort potential of a novel solid-solid phase change material, known as Dal HSM, is compared and contrasted to commonly available forms of thermal mass. Detailed experimentation is conducted to successfully integrate Dal HSM with gypsum and concrete. The measurement of physical characteristics such as compressive strength and modulus of rupture is conducted to ensure that the PCM-composite compound retains the structural integrity to be utilized in a typical building. The use of thermal mass in the Toronto Net Zero house was found to contribute to energy savings of 10-15% when different types of thermal mass were used. The comfort level of the indoor occupants was also found to increase. The performance of Dal HSM was found to be comparable to a commercially available PCM known as Micronal in the heating mode. The cooling mode revealed that Dal HSM provided slightly lower energy savings when compared to Micronal due to a lower phase transition temperature and latent heat. The performance of physical test revealed a decrease in the compressive strength as the concentration of Dal HSM was increased in the PCM-gypsum specimens. Tests were also performed to analyze the impact of increasing the PCM concentration on the flexural strength of PCM-gypsum composite.

The Importance of Lightweight Concrete Technology Development for IBS Industry in Malaysia Based on Cost Comparison between Concrete Slab and Hollow Core Slab: A Case Study of LRT Car Park Project

2014 ◽  
Vol 567 ◽  
pp. 637-641 ◽  
Author(s):  
Mohd Zakwan Ramli ◽  
Harlina Mohd Mahayudin ◽  
G. Hayder ◽  
Z.M. Hafiz ◽  
M. Daud ◽  
...  
Keyword(s):  
Lightweight Concrete ◽  
Concrete Slab ◽  
New Technology ◽  
Cost Comparison ◽  
Future Research ◽  
Hollow Core ◽  
Concrete Technology ◽  
Conventional Concrete ◽  
Starting Point ◽  
Hollow Core Slab

There are several issues related to the implementation of new Industrialised Building System (IBS) technology in Malaysia which some of them are the awareness among industry players, and lack of development on the new technology in the industry. The main constraint that has always been discussed by the IBS players is time and cost. To have more reliable product or technology in terms of cost and time, it is important to craft and develop new idea as well as technology in our own country. The objective of this study was to highlight the cost comparison between cast in-situ concrete slab and hollow core slab (lightweight) which it can be a starting point for future research on the development of new lightweight IBS technology in Malaysia to get the most reliable cost with latest technology by using local resources. Informations on costs and work durations are collected and analysed between two floors using two different construction methods (hollow core slab and conventional concrete slab). Hollow core slab (lightweight IBS) has similar or less cost with shorter construction period (30% shorter) for the project.

scholarly journals Incorporation of Phase Change Materials in Lightweight Aggregate Concrete

2020 ◽  
Vol 16 ◽  
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Thermal Response ◽  
Lightweight Aggregate ◽  
Hydration Heat ◽  
Lightweight Aggregate Concrete ◽  
Thermal Mass ◽  
Hardened Concrete ◽  
Bioclimatic Design ◽  
Pumice Aggregates

An investigation on some methods for the incorporation of phase change materials (PCMs) into concrete and their effect on its properties is presented. PCMs are characterized by high latent fusion heat, which can increase thermal mass of concrete and contribute to the bioclimatic design of buildings. Concrete compositions with different aggregates (limestone, lightweight or their combination), as well as with different PCMs (paraffinic and dodecyl alcohol) were prepared by different incorporation methods (impregnation to lightweight aggregates or immersion of concrete specimens). Properties of fresh and hardened concrete were studied, as well as hydration heat, thermal response and flammability. The results revealed that the selected PCMs do not significantly affect the properties of concrete. Regarding hydration heat, the presence of the PCM in concrete contributes to a decrease of the temperature peak during hydration which also occurs delayed. Thermal response measurements showed that concrete with purely pumice aggregates has a much better thermal behavior than the other two compositions, while the existence of PCM causes large or small increase of concretes heat capacity, in temperature near to each PCM’s melting point. Finally, appropriate application of PCMs is needed in order to moderate the reported effect on concrete’s fire resistance

scholarly journals NeGeV: next generation energy efficient ventilation system using phase change materials

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Christian T. Veje ◽  
Muhyiddine Jradi ◽  
Ivar Lund ◽  
Thomas Hansen ◽  
Klavs Kamuk ◽  
...  
Keyword(s):  
Phase Change ◽  
Energy Efficient ◽  
Phase Change Materials ◽  
Ventilation System ◽  
Next Generation

scholarly journals A NUMERICAL SOLUTION THAT DETERMINES THE TEMPERATURE FIELD INSIDE PHASE CHANGE MATERIALS: APPLICATION IN BUILDINGS

2013 ◽  
Vol 19 (4) ◽  
pp. 518-528 ◽  
Author(s):  
Giuseppina Ciulla ◽  
Valerio Lo Brano ◽  
Antonio Messineo ◽  
Giorgia Peri
Keyword(s):  
Phase Change ◽  
Numerical Solution ◽  
Building Materials ◽  
Phase Change Materials ◽  
Energy Savings ◽  
Transfer Problem ◽  
Energy Performance ◽  
Wall Layer ◽  
Storage Device ◽  
Thermal Mass

The use of novel building materials that contain active thermal components would be a major advancement in achieving significant heating and cooling energy savings. In the last 40 years, Phase Change Materials or PCMs have been tested as thermal mass components in buildings, and most studies have found that PCMs enhance the building energy performance. The use of PCMs as an energy storage device is due to their relatively high fusion latent heat; during the melting and/or solidification phase, a PCM is capable of storing or releasing a large amount of energy. PCMs in a wall layer store solar energy during the warmer hours of the day and release it during the night, thereby decreasing and shifting forward in time the peak wall temperature. In this paper, an algorithm is presented based on the general Fourier differential equations that solve the heat transfer problem in multi-layer wall structures, such as sandwich panels, that includes a layer that can change phase. In detail, the equations are proposed and transformed into formulas useful in the FDM approach (finite difference method), which solves the system simultaneously for the temperature at each node. The equation set proposed is accurate, fast and easy to integrate into most building simulation tools in any programming language. The numerical solution was validated using a comparison with the Voller and Cross analytical test problem.

scholarly journals Active thermal mass enhancement using phase change materials

2016 ◽  
Vol 111 ◽  
pp. 1-11 ◽  
Author(s):  
T.R. Whiffen ◽  
G. Russell-Smith ◽  
S.B. Riffat
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Thermal Mass ◽  
Mass Enhancement

scholarly journals Numerical Simulation of a Novel Dual Layered Phase Change Material Brick Wall for Human Comfort in Hot and Cold Climatic Conditions

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 4032
Author(s):  
Atiq Ur Rehman ◽  
Shakil R. Sheikh ◽  
Zareena Kausar ◽  
Sarah J. McCormack
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Thermal Characteristics ◽  
Extended Period ◽  
Climatic Conditions ◽  
Heat Of Fusion ◽  
Thermal Mass ◽  
Brick Wall ◽  
Latent Heat Storage ◽  
Human Comfort

Phase change materials (PCMs) have a large number of applications for thermal energy storage (TES) and temperature reduction in buildings due to their thermal characteristics and latent heat storage capabilities. The thermal mass of typical brick walls can be substantially increased using a suitable PCM primarily based on phase change temperature and heat of fusion for different weather conditions in summer and winter. This study proposed a novel dual-layer PCM configuration for brick walls to maintain human comfort for hot and cold climatic conditions in Islamabad, Pakistan. Numerical simulations were performed using Ansys Fluent for dual PCMs layered within a brick wall for June and January with melting temperatures of 29 °C and 13 °C. This study examined and discussed the charging and discharging cycles of PCMs over an extended period (one month) to establish whether the efficacy of PCMs is hindered due to difficulties in discharging. The results show that the combined use of both PCMs stated above provides better human comfort with reduced energy requirements in Islamabad throughout the year than using a single PCM (29 °C) for summer or winter (13 °C) alone.

scholarly journals Thermo-physical characteristics of building integrated phase change materials (PCM) and their applicability to energy efficient homes

2021 ◽  
Author(s):  
Omar Siddiqui
Keyword(s):  
Compressive Strength ◽  
Phase Change ◽  
Phase Change Materials ◽  
Energy Savings ◽  
Physical Characteristics ◽  
Comfort Level ◽  
Thermal Mass ◽  
Lower Phase ◽  
Physical Test ◽  
The Impact

The applicability of utilizing a variety of thermal mass including phase change materials with commonly used building materials is investigated through the use of simulations and physical testing. The thermal performance and occupant comfort potential of a novel solid-solid phase change material, known as Dal HSM, is compared and contrasted to commonly available forms of thermal mass. Detailed experimentation is conducted to successfully integrate Dal HSM with gypsum and concrete. The measurement of physical characteristics such as compressive strength and modulus of rupture is conducted to ensure that the PCM-composite compound retains the structural integrity to be utilized in a typical building. The use of thermal mass in the Toronto Net Zero house was found to contribute to energy savings of 10-15% when different types of thermal mass were used. The comfort level of the indoor occupants was also found to increase. The performance of Dal HSM was found to be comparable to a commercially available PCM known as Micronal in the heating mode. The cooling mode revealed that Dal HSM provided slightly lower energy savings when compared to Micronal due to a lower phase transition temperature and latent heat. The performance of physical test revealed a decrease in the compressive strength as the concentration of Dal HSM was increased in the PCM-gypsum specimens. Tests were also performed to analyze the impact of increasing the PCM concentration on the flexural strength of PCM-gypsum composite.

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