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This study assesses the influence of rheology and density on the collapse behaviour of mechanically foamed fresh aerated concrete. The collapse mechanism was studied under two conditions of varying interstitial paste's rheology and varying foam content. Adequate yield stress in the interstitial cement paste (critical yield stress) is crucial to achieve stability, below which the foam concrete displays partial or complete collapse. However, higher yield stresses may affect the hardened properties, thus an optimum range is important. Besides, this critical yield stress decreases with the foam content, leading to enhanced stability at lower densities. The critical yield stress to prevent collapse was then experimentally determined and compared against the yield stresses required to prevent the rising of bubbles (buoyancy) and the flow of interstitial paste through the foam network (drainage). This comparison showed that the experimentally determined critical yield stress to prevent foam collapse agrees well with the drainage-based stability criteria.
K. Dhasindrakrishna; Sayanthan Ramakrishnan; Kirubajiny Pasupathy; Jay Sanjayan. Collapse of fresh foam concrete: Mechanisms and influencing parameters. Cement and Concrete Composites 2021, 122, 104151 .
AMA StyleK. Dhasindrakrishna, Sayanthan Ramakrishnan, Kirubajiny Pasupathy, Jay Sanjayan. Collapse of fresh foam concrete: Mechanisms and influencing parameters. Cement and Concrete Composites. 2021; 122 ():104151.
Chicago/Turabian StyleK. Dhasindrakrishna; Sayanthan Ramakrishnan; Kirubajiny Pasupathy; Jay Sanjayan. 2021. "Collapse of fresh foam concrete: Mechanisms and influencing parameters." Cement and Concrete Composites 122, no. : 104151.
Buildability is the ability to 3D print by adding concrete layer by layer continuously to the required level without significant deformation or collapse of the freshly printed component. This paper presents a systematic review of the reported studies to improve the buildability of concrete. The paper also presents original concepts and some results for improving the buildability of geopolymer concrete. Two methods to enhance the buildability are discussed: (1) Additives during initial mixing of concrete (2) Buildability enhancement at the print-head by an intervention (set-on-demand). The former method is the most widely studied, however, it affects the pumpability. The latter includes mixing accelerators, heating, ultrasonication, or magnetorheological control, performed at the print-head to rapidly increase the yield strength of the material immediately prior to extrusion. This method does not affect the pumpability of the mix until it reaches the print-head. Finally, the prospects of a new set-on-demand method are presented.
Shravan Muthukrishnan; Sayanthan Ramakrishnan; Jay Sanjayan. Technologies for improving buildability in 3D concrete printing. Cement and Concrete Composites 2021, 122, 104144 .
AMA StyleShravan Muthukrishnan, Sayanthan Ramakrishnan, Jay Sanjayan. Technologies for improving buildability in 3D concrete printing. Cement and Concrete Composites. 2021; 122 ():104144.
Chicago/Turabian StyleShravan Muthukrishnan; Sayanthan Ramakrishnan; Jay Sanjayan. 2021. "Technologies for improving buildability in 3D concrete printing." Cement and Concrete Composites 122, no. : 104144.
Aerated concrete is composed of a large number of air voids to make it lightweight and to improve the insulation capacity; however, it possesses low thermal energy storage capacity. This paper reports the synthesis and properties of phase change material (PCM) composite integrated aerated/foamed geopolymer concrete (GFC) for enhancing the thermal storage capacity. A paraffin/hydrophobic expanded perlite based form-stable PCM composite was incorporated into the aerated concrete, and the chemical compatibility, mechanical properties, and thermal performance were experimentally evaluated. The FT-IR and TGA tests have indicated that the PCM composite is chemically compatible and thermally stable with GFC. The thermal performance tests on GFC, studied by simulated test rooms, has revealed that the GFC containing PCM composite has very high thermal energy storage capacity. The incorporation of 15% and 30% of PCM composite has reduced the peak indoor temperature of the test room by 1.85 °C, 3.76 °C, respectively while enhancing the thermal storage capacity by 105% and 181%. Despite the reduction in mechanical properties of geopolymer concrete with PCM, the GFC containing PCM has shown enhanced mechanical properties. The air-void distribution had also been improved with the formation of uniform and fine air voids in PCM integrated GFC. The enhancement in mechanical properties and uniform distribution of fine air voids was attributed to PCM composite's lightweight properties. This has resulted in reduced foam content to meet density requirements, thus increasing the size of gel particulates surrounding the air voids.
Sayanthan Ramakrishnan; Kirubajiny Pasupathy; Jay Sanjayan. Synthesis and properties of thermally enhanced aerated geopolymer concrete using form-stable phase change composite. Journal of Building Engineering 2021, 40, 102756 .
AMA StyleSayanthan Ramakrishnan, Kirubajiny Pasupathy, Jay Sanjayan. Synthesis and properties of thermally enhanced aerated geopolymer concrete using form-stable phase change composite. Journal of Building Engineering. 2021; 40 ():102756.
Chicago/Turabian StyleSayanthan Ramakrishnan; Kirubajiny Pasupathy; Jay Sanjayan. 2021. "Synthesis and properties of thermally enhanced aerated geopolymer concrete using form-stable phase change composite." Journal of Building Engineering 40, no. : 102756.
Yield strength development of 3D printable concrete by the early age activation reactions plays a vital role in the printability of geopolymer concrete. This study presents a rheo-chemical approach to investigate the early age strength development due to alkali reactions for the formulation of suitable 3D printable one-part geopolymer concrete. The influence of design parameters, including activator content, thixotropic additive (Magnesium Alumino Silicate -MAS), and retarder (sucrose) dosage, on the rheological properties of concrete were assessed. The shear stresses of geopolymer concrete were measured with the aid of a rotational rheometer for various shearing protocols that represent the major stages of printing operation (pumping, extrusion and building). The measured rheological properties were related to reaction kinetics of geopolymer mixes using FT-IR spectroscopy and calorimetry. The results revealed that, with MAS, activator and sucrose content of 0.75 wt%, 10 wt% and 1.5 wt% of the binder respectively, the formulated one-part geopolymer showcased enhanced printing properties. This is further demonstrated by printing laboratory-scale specimens and evaluating the hardened properties.
Shravan Muthukrishnan; Sayanthan Ramakrishnan; Jay Sanjayan. Effect of alkali reactions on the rheology of one-part 3D printable geopolymer concrete. Cement and Concrete Composites 2020, 116, 103899 .
AMA StyleShravan Muthukrishnan, Sayanthan Ramakrishnan, Jay Sanjayan. Effect of alkali reactions on the rheology of one-part 3D printable geopolymer concrete. Cement and Concrete Composites. 2020; 116 ():103899.
Chicago/Turabian StyleShravan Muthukrishnan; Sayanthan Ramakrishnan; Jay Sanjayan. 2020. "Effect of alkali reactions on the rheology of one-part 3D printable geopolymer concrete." Cement and Concrete Composites 116, no. : 103899.
Geopolymer foam concrete (GFC) has gained significant research interest in various fields, thanks to the porous structure bringing the inherent merits of lightweight, acoustic and thermal insulation, and fire resistance. This review is focussed on three primary functional properties of GFC, namely mechanical properties (compression and flexural strengths), serviceability (thermal conductivity, sound absorption, and fire resistance), and durability. The functional properties depend on the fundamental fresh and hardened properties (rheology, stability, density, porosity and pore morphology), and all these properties are decided by the materials, foaming methods, curing conditions, and additives; a clear insight to these relationships and the ways of optimising the performance as a construction material is therefore presented. Besides, the challenges towards the large-scale production and real-world application of GFC are discussed. The identified research needs include studies on fresh properties, durability, processing techniques to attract industrial applications, and developing 3D printable GFC.
K. Dhasindrakrishna; Kirubajiny Pasupathy; Sayanthan Ramakrishnan; Jay Sanjayan. Progress, current thinking and challenges in geopolymer foam concrete technology. Cement and Concrete Composites 2020, 116, 103886 .
AMA StyleK. Dhasindrakrishna, Kirubajiny Pasupathy, Sayanthan Ramakrishnan, Jay Sanjayan. Progress, current thinking and challenges in geopolymer foam concrete technology. Cement and Concrete Composites. 2020; 116 ():103886.
Chicago/Turabian StyleK. Dhasindrakrishna; Kirubajiny Pasupathy; Sayanthan Ramakrishnan; Jay Sanjayan. 2020. "Progress, current thinking and challenges in geopolymer foam concrete technology." Cement and Concrete Composites 116, no. : 103886.
A novel application of microwave heating was investigated to attain on-demand setting of concrete for the improvement in buildability of 3D printable geopolymer concrete. An integrated microwave heating facility at the nozzle head was replicated using laboratory experiments to understand its effect on the structural build-up of printed filaments. Different microwave heating durations of 5, 10 and 20 s were studied, and the fresh and hardened properties were compared with control specimen (without microwaving). At optimised heating, the interlayer bond strength was found to be increased by 127% and 122% at 7 and 28 days respectively. Furthermore, structural recovery of material after extrusion that governs its buildability, showed a tremendous improvement at optimum heating period. Control specimens could only recover up to 32% of the initial viscosity, whereas addition of microwave heating for 10 s enhanced the viscosity recovery to more than 70%. Effect of microwave heating on cement based concrete 3D printing was also studied to assess the robustness of this technique. Outcomes from this study proposes a novel approach of applying microwave heating to construction 3D printing to achieve “set-on-demand” printable concrete. This study provides a starting point to develop new generation of print head to combat issues faced by current 3D printing practices.
Shravan Muthukrishnan; Sayanthan Ramakrishnan; Jay Sanjayan. Buildability of Geopolymer Concrete for 3D Printing with Microwave Heating. High Performance Fiber Reinforced Cement Composites 6 2020, 926 -935.
AMA StyleShravan Muthukrishnan, Sayanthan Ramakrishnan, Jay Sanjayan. Buildability of Geopolymer Concrete for 3D Printing with Microwave Heating. High Performance Fiber Reinforced Cement Composites 6. 2020; ():926-935.
Chicago/Turabian StyleShravan Muthukrishnan; Sayanthan Ramakrishnan; Jay Sanjayan. 2020. "Buildability of Geopolymer Concrete for 3D Printing with Microwave Heating." High Performance Fiber Reinforced Cement Composites 6 , no. : 926-935.
This paper investigates the potential of using form-stable phase change material (FS-PCM) integrated cement mortars in building envelopes to prevent overheating and to improve summer thermal comfort. The FS-PCM integrated cement mortar was applied as the interior surface plastering mortar of a full-scale test hut and compared with identical test huts built on cement plasterboard (OCB) and gypsum plasterboard (GPB). The test huts were exposed to outdoor climatic conditions, and indoor thermal behaviours were continuously monitored throughout the summer period. The effects of PCM in reducing the overheating was analysed by the intensity of thermal discomfort (ITDover) and frequency of thermal discomfort (FTDover) for overheating during the summer days. The comparison between different test huts showed that the application of PCM integrated cement mortars reduced the peak indoor temperature by up to 2.4 °C, compared to GPB and OCB test rooms. More importantly, the analysis of overheating effects revealed that at lower intensive thermal discomfort levels, FS-PCM largely reduces FTDover. As the intensity of thermal discomfort increases, the reduction in ITDover becomes dominant. At highly intensive thermal discomfort levels, the reduction was neither apparent in the intensity of thermal discomfort nor the period of discomfort.
Sayanthan Ramakrishnan; Jay Sanjayan; XiaoMing Wang. Experimental Research on Using Form-stable PCM-Integrated Cementitious Composite for Reducing Overheating in Buildings. Buildings 2019, 9, 57 .
AMA StyleSayanthan Ramakrishnan, Jay Sanjayan, XiaoMing Wang. Experimental Research on Using Form-stable PCM-Integrated Cementitious Composite for Reducing Overheating in Buildings. Buildings. 2019; 9 (3):57.
Chicago/Turabian StyleSayanthan Ramakrishnan; Jay Sanjayan; XiaoMing Wang. 2019. "Experimental Research on Using Form-stable PCM-Integrated Cementitious Composite for Reducing Overheating in Buildings." Buildings 9, no. 3: 57.
This study focuses on further development of a novel paraffin/hydrophobic expanded perlite form-stable PCM composite to increase its heat transfer performance in cement-based composites. For this purpose, various high conductive carbon-based additives were integrated into form-stable PCM composite and their heat transfer performance enhancement was studied and compared. Graphite (G), carbon nanotubes (CNT) and graphene nanoplatelets (GNP) were considered as the heat transfer additives. It was found that all additives have good chemical compatibility, high latent heat and significant enhancement in thermal conductivity of PCM composite. The use of 0.5wt% of G, CNT and GNP led to the thermal conductivity enhancement of 45%, 30% and 49% respectively. Although G and GNP additives showed high thermal conductivity increment, heat transfer performance tests showed that GNP leads to highest performance enhancement and graphite the least. It was inferred that irrespective of the improvement in thermal conductivity, heat transfer performance of form-stable PCMs largely depends on the formation of the high conductive interconnecting network in the porous granules. The additives with the high specific surface area and smaller particle size than the pore diameter would be an excellent candidate to improve heat transfer performance of form-stable PCMs. TES performance of cementitious composites, as measured from prototype test cell experiments, revealed that the integration of G, CNT, and GNP into form-stable PCM enhanced the heat gain energy of interior walls by 78%, 122%, and 200% respectively.
Sayanthan Ramakrishnan; XiaoMing Wang; Jay Sanjayan. Effects of various carbon additives on the thermal storage performance of form-stable PCM integrated cementitious composites. Applied Thermal Engineering 2018, 148, 491 -501.
AMA StyleSayanthan Ramakrishnan, XiaoMing Wang, Jay Sanjayan. Effects of various carbon additives on the thermal storage performance of form-stable PCM integrated cementitious composites. Applied Thermal Engineering. 2018; 148 ():491-501.
Chicago/Turabian StyleSayanthan Ramakrishnan; XiaoMing Wang; Jay Sanjayan. 2018. "Effects of various carbon additives on the thermal storage performance of form-stable PCM integrated cementitious composites." Applied Thermal Engineering 148, no. : 491-501.
Thermal performance of latent heat thermal energy storage (LHTES) systems is often limited by low thermal conductivity of phase change materials (PCMs), which reduces the heat transfer rate and energy storage efficiency. This study investigates the development of a thermally enhanced paraffin/hydrophobic expanded perlite (EPOP) form-stable PCM seeded with graphene nanoplatelets (GNP) as a heat transfer promoter. Experimental research was carried out on fabrication, characterization and heat transfer performance analysis of EPOP–GNP composite. It was shown that the GNP particles were partially immersed into the paraffin occupied in the pores of EPO, which remarkably improved the thermal properties and heat transfer performance of composite PCM. In comparison with EPOP, the addition of 0.5 wt% GNP increased the thermal conductivity by up to 49%. Heat transfer performance test also showed that the EPOP–GNP composite reduced the heat storage/release duration by up to 20%, compared to EPOP. Moreover, prototype test room experiment conducted on cement mortars containing EPOP–GNP revealed that the introduction GNP into form-stable PCM significantly enhanced the thermal energy storage performance of cement mortars. This is particularly demonstrated by the reduction in peak inner surface temperature of 0.8°C and the increase in inner surface convective heat gain energy by 78%, compared to cement mortars containing EPOP only. It can be said, therefore, the integration of GNP into form-stable PCMs is a promising way to achieve high energy storage efficiency for numerous LHTES applications such as solar energy storage and energy conversation in buildings.
Sayanthan Ramakrishnan; XiaoMing Wang; Jay Sanjayan. Thermal enhancement of paraffin/hydrophobic expanded perlite granular phase change composite using graphene nanoplatelets. Energy and Buildings 2018, 169, 206 -215.
AMA StyleSayanthan Ramakrishnan, XiaoMing Wang, Jay Sanjayan. Thermal enhancement of paraffin/hydrophobic expanded perlite granular phase change composite using graphene nanoplatelets. Energy and Buildings. 2018; 169 ():206-215.
Chicago/Turabian StyleSayanthan Ramakrishnan; XiaoMing Wang; Jay Sanjayan. 2018. "Thermal enhancement of paraffin/hydrophobic expanded perlite granular phase change composite using graphene nanoplatelets." Energy and Buildings 169, no. : 206-215.
Sayanthan Ramakrishnan; XiaoMing Wang; Jay Sanjayan; John L Wilson. Thermal performance assessment of phase change material integrated cementitious composites in buildings: Experimental and numerical approach. Applied Energy 2017, 207, 654 -664.
AMA StyleSayanthan Ramakrishnan, XiaoMing Wang, Jay Sanjayan, John L Wilson. Thermal performance assessment of phase change material integrated cementitious composites in buildings: Experimental and numerical approach. Applied Energy. 2017; 207 ():654-664.
Chicago/Turabian StyleSayanthan Ramakrishnan; XiaoMing Wang; Jay Sanjayan; John L Wilson. 2017. "Thermal performance assessment of phase change material integrated cementitious composites in buildings: Experimental and numerical approach." Applied Energy 207, no. : 654-664.
This study demonstrates the development of thermal energy storage cementitious composites (TESCs) by integrating a form-stable phase change material (PCM) composite into cement matrix. The PCM composite was fabricated on paraffin and hydrophobic expanded perlite. The mass percentage of paraffin in the composite can reach as much as 50% due to the excellent absorption capacity of expanded perlite. Fourier transform infrared (FT-IR) spectroscopy and thermo-gravimetric analysis (TGA) tests show that the fabricated PCM composite has good chemical compatibility and thermal stability. TESCs developed by partially replacing the fine aggregate with PCM composite reveals that the composite PCM has good compatibility with cement matrix. It is shown that TESC developed with 60% substitution level of composite PCM resulted in 28-day compressive strength of 25 MPa. Furthermore, compared to ordinary cement mortar, maximum reductions on 28-day compressive strength, apparent density and thermal conductivity with the 80% substitution level are 70%, 48% and 66% respectively. The thermal performance test shows that thermal energy storage capacity of TESC with 80% substitution level is increased by 166% compared to ordinary cement mortar. Furthermore, mechanical and thermal reliability tests reveal that the TESCs do not show any signs of degradation when subjected to 1000 accelerated thermal cycles.
Sayanthan Ramakrishnan; XiaoMing Wang; Jay Sanjayan; Eustathios Petinakis; John L Wilson. Development of thermal energy storage cementitious composites (TESC) containing a novel paraffin/hydrophobic expanded perlite composite phase change material. Solar Energy 2017, 158, 626 -635.
AMA StyleSayanthan Ramakrishnan, XiaoMing Wang, Jay Sanjayan, Eustathios Petinakis, John L Wilson. Development of thermal energy storage cementitious composites (TESC) containing a novel paraffin/hydrophobic expanded perlite composite phase change material. Solar Energy. 2017; 158 ():626-635.
Chicago/Turabian StyleSayanthan Ramakrishnan; XiaoMing Wang; Jay Sanjayan; Eustathios Petinakis; John L Wilson. 2017. "Development of thermal energy storage cementitious composites (TESC) containing a novel paraffin/hydrophobic expanded perlite composite phase change material." Solar Energy 158, no. : 626-635.
Morshed Alam; Jay Sanjayan; Patrick X.W. Zou; Sayanthan Ramakrishnan; John Wilson. Evaluating the passive and free cooling application methods of phase change materials in residential buildings: A comparative study. Energy and Buildings 2017, 148, 238 -256.
AMA StyleMorshed Alam, Jay Sanjayan, Patrick X.W. Zou, Sayanthan Ramakrishnan, John Wilson. Evaluating the passive and free cooling application methods of phase change materials in residential buildings: A comparative study. Energy and Buildings. 2017; 148 ():238-256.
Chicago/Turabian StyleMorshed Alam; Jay Sanjayan; Patrick X.W. Zou; Sayanthan Ramakrishnan; John Wilson. 2017. "Evaluating the passive and free cooling application methods of phase change materials in residential buildings: A comparative study." Energy and Buildings 148, no. : 238-256.
Sayanthan Ramakrishnan; XiaoMing Wang; Jay Sanjayan; John Wilson. Thermal performance of buildings integrated with phase change materials to reduce heat stress risks during extreme heatwave events. Applied Energy 2017, 194, 410 -421.
AMA StyleSayanthan Ramakrishnan, XiaoMing Wang, Jay Sanjayan, John Wilson. Thermal performance of buildings integrated with phase change materials to reduce heat stress risks during extreme heatwave events. Applied Energy. 2017; 194 ():410-421.
Chicago/Turabian StyleSayanthan Ramakrishnan; XiaoMing Wang; Jay Sanjayan; John Wilson. 2017. "Thermal performance of buildings integrated with phase change materials to reduce heat stress risks during extreme heatwave events." Applied Energy 194, no. : 410-421.
Sayanthan Ramakrishnan; XiaoMing Wang; Jay Sanjayan; John L Wilson. Experimental and Numerical Study on Energy Performance of Buildings Integrated with Phase Change Materials. Energy Procedia 2017, 105, 2214 -2219.
AMA StyleSayanthan Ramakrishnan, XiaoMing Wang, Jay Sanjayan, John L Wilson. Experimental and Numerical Study on Energy Performance of Buildings Integrated with Phase Change Materials. Energy Procedia. 2017; 105 ():2214-2219.
Chicago/Turabian StyleSayanthan Ramakrishnan; XiaoMing Wang; Jay Sanjayan; John L Wilson. 2017. "Experimental and Numerical Study on Energy Performance of Buildings Integrated with Phase Change Materials." Energy Procedia 105, no. : 2214-2219.
Sayanthan Ramakrishnan; XiaoMing Wang; Jay Sanjayan; John Wilson. Heat Transfer Performance Enhancement of Paraffin/Expanded Perlite Phase Change Composites with Graphene Nano-platelets. Energy Procedia 2017, 105, 4866 -4871.
AMA StyleSayanthan Ramakrishnan, XiaoMing Wang, Jay Sanjayan, John Wilson. Heat Transfer Performance Enhancement of Paraffin/Expanded Perlite Phase Change Composites with Graphene Nano-platelets. Energy Procedia. 2017; 105 ():4866-4871.
Chicago/Turabian StyleSayanthan Ramakrishnan; XiaoMing Wang; Jay Sanjayan; John Wilson. 2017. "Heat Transfer Performance Enhancement of Paraffin/Expanded Perlite Phase Change Composites with Graphene Nano-platelets." Energy Procedia 105, no. : 4866-4871.
Sayanthan Ramakrishnan; XiaoMing Wang; Jay Sanjayan; John Wilson. Assessing the feasibility of integrating form-stable phase change material composites with cementitious composites and prevention of PCM leakage. Materials Letters 2017, 192, 88 -91.
AMA StyleSayanthan Ramakrishnan, XiaoMing Wang, Jay Sanjayan, John Wilson. Assessing the feasibility of integrating form-stable phase change material composites with cementitious composites and prevention of PCM leakage. Materials Letters. 2017; 192 ():88-91.
Chicago/Turabian StyleSayanthan Ramakrishnan; XiaoMing Wang; Jay Sanjayan; John Wilson. 2017. "Assessing the feasibility of integrating form-stable phase change material composites with cementitious composites and prevention of PCM leakage." Materials Letters 192, no. : 88-91.
Morshed Alam; Jay Sanjayan; Patrick X.W. Zou; Sayanthan Ramakrishnan; John Wilson. A Comparative Study on the Effectiveness of Passive and Free Cooling Application Methods of Phase Change Materials for Energy Efficient Retrofitting in Residential Buildings. Procedia Engineering 2017, 180, 993 -1002.
AMA StyleMorshed Alam, Jay Sanjayan, Patrick X.W. Zou, Sayanthan Ramakrishnan, John Wilson. A Comparative Study on the Effectiveness of Passive and Free Cooling Application Methods of Phase Change Materials for Energy Efficient Retrofitting in Residential Buildings. Procedia Engineering. 2017; 180 ():993-1002.
Chicago/Turabian StyleMorshed Alam; Jay Sanjayan; Patrick X.W. Zou; Sayanthan Ramakrishnan; John Wilson. 2017. "A Comparative Study on the Effectiveness of Passive and Free Cooling Application Methods of Phase Change Materials for Energy Efficient Retrofitting in Residential Buildings." Procedia Engineering 180, no. : 993-1002.
Sayanthan Ramakrishnan; XiaoMing Wang; Jay Sanjayan; John L Wilson. Thermal Energy Storage Enhancement of Lightweight Cement Mortars with the Application of Phase Change Materials. Procedia Engineering 2017, 180, 1170 -1177.
AMA StyleSayanthan Ramakrishnan, XiaoMing Wang, Jay Sanjayan, John L Wilson. Thermal Energy Storage Enhancement of Lightweight Cement Mortars with the Application of Phase Change Materials. Procedia Engineering. 2017; 180 ():1170-1177.
Chicago/Turabian StyleSayanthan Ramakrishnan; XiaoMing Wang; Jay Sanjayan; John L Wilson. 2017. "Thermal Energy Storage Enhancement of Lightweight Cement Mortars with the Application of Phase Change Materials." Procedia Engineering 180, no. : 1170-1177.
Behzad Nematollahi; Ravi Ranade; Jay Sanjayan; Sayanthan Ramakrishnan. Thermal and mechanical properties of sustainable lightweight strain hardening geopolymer composites. Archives of Civil and Mechanical Engineering 2017, 17, 55 -64.
AMA StyleBehzad Nematollahi, Ravi Ranade, Jay Sanjayan, Sayanthan Ramakrishnan. Thermal and mechanical properties of sustainable lightweight strain hardening geopolymer composites. Archives of Civil and Mechanical Engineering. 2017; 17 (1):55-64.
Chicago/Turabian StyleBehzad Nematollahi; Ravi Ranade; Jay Sanjayan; Sayanthan Ramakrishnan. 2017. "Thermal and mechanical properties of sustainable lightweight strain hardening geopolymer composites." Archives of Civil and Mechanical Engineering 17, no. 1: 55-64.
This paper presents a design optimization related to the application of phase change materials within buildings, which aims to maximize the utilization of latent heat capacity to improve indoor thermal comfort during summer season. Two performance indicators are developed: efficiency coefficient (a representation of the effective utilization of latent heat storage capacity) and effectiveness coefficient (a representation of improvement of indoor thermal comfort). A series of parameters which influence the efficiency coefficient and effectiveness coefficient are identified and then formulated to quantify those coefficients for optimal design. With the performance indicators defined, a case study is performed in a typical standard Australian residential house to derive the optimized design of PCM refurbishment utilizing the developed performance indicators. Results reveal that the performance indicators are effective in the selection of optimum PCM configurations so that the resultant PCM storage efficiency and indoor thermal comfort are optimized. This is particularly demonstrated by the significant enhancement of storage efficiency and effectiveness of optimized PCM compared to non-optimized cases for each climate conditions. Furthermore, an optimized PCM condition is found to be more cost-effective than the non-optimized conditions
Sayanthan Ramakrishnan; XiaoMing Wang; Morshed Alam; Jay Sanjayan; John L Wilson. Parametric analysis for performance enhancement of phase change materials in naturally ventilated buildings. Energy and Buildings 2016, 124, 35 -45.
AMA StyleSayanthan Ramakrishnan, XiaoMing Wang, Morshed Alam, Jay Sanjayan, John L Wilson. Parametric analysis for performance enhancement of phase change materials in naturally ventilated buildings. Energy and Buildings. 2016; 124 ():35-45.
Chicago/Turabian StyleSayanthan Ramakrishnan; XiaoMing Wang; Morshed Alam; Jay Sanjayan; John L Wilson. 2016. "Parametric analysis for performance enhancement of phase change materials in naturally ventilated buildings." Energy and Buildings 124, no. : 35-45.