ORCID Profile
0000-0003-0763-7293
Current Organisation
RMIT University
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Civil Engineering | Simulation and Modelling | Construction Engineering |
Expanding Knowledge in the Physical Sciences | Expanding Knowledge in Engineering | Civil Construction Design
Publisher: Elsevier BV
Date: 09-2018
Publisher: Elsevier BV
Date: 2019
Publisher: Elsevier BV
Date: 10-2018
Publisher: AIP Publishing
Date: 07-2021
DOI: 10.1063/5.0051189
Abstract: Solar chimneys as cost-effective renewable energy systems offer significant energy saving in buildings through the enhanced natural ventilation. Previous studies have focused on the fluid dynamics of the solar chimney itself. Still, few studies were found in the literature on its assessment on the energy performance in buildings, such as addressing how many percentages of energy can be saved based on it in buildings. This is mainly due to the relevant challenges of the assessment methods, such as absent functions, modeling accuracy, experimental validation, and the capability of addressing many influencing factors. To overcome the constraints, five typical energy assessment methods were critically reviewed through this review, including hydrostatic pressure, thermal network, zonal model, theoretical/empirical models, and computational fluid dynamics (CFD) modeling. This is the first review paper specified for the energy assessment methods of solar chimneys. The major influencing factors of solar chimney include configuration, installation conditions, material usage, and environment. The current energy assessments for solar chimneys are primarily based on the thermal network and zonal model (or the combination) but not CFD modeling. The current challenge for hydrostatic pressure analysis is its applications in multiple chambers, especially with those large openings (e.g., doors and windows). The thermal network could overcome this challenge, but its modeling accuracy and generality still require effort. Due to many influencing factors, a single assessment method may not be viable for practical implementation. Future research on energy assessment could be in several directions, such as a combined zonal and CFD modeling, the validity and uncertainty of those energy assessments in practical building applications, and detailed and comprehensive experimental tests for the validation.
Publisher: Elsevier BV
Date: 08-2009
Publisher: Springer Science and Business Media LLC
Date: 15-07-2017
Publisher: Elsevier BV
Date: 05-2018
Publisher: IOP Publishing
Date: 06-2018
Publisher: Elsevier BV
Date: 03-2017
Publisher: Springer Science and Business Media LLC
Date: 22-05-2020
Publisher: Elsevier BV
Date: 10-2018
Publisher: American Chemical Society (ACS)
Date: 28-08-2018
Abstract: Na-ion batteries (NIBs) have attracted increasing attention given the fact that sodium is relatively more plentiful and affordable than lithium for sustainable and large-scale energy storage systems. However, the shortage of electrode materials with outstanding comprehensive properties has limited the practical implementations of NIBs. Among all the discovered anode materials, transition-metal sulfide has been proven as one of the most competitive and promising ones due to its excellent redox reversibility and relatively high theoretical capacity. In this study, double-morphology N-doped CoS
Publisher: No publisher found
Date: 2019
Publisher: Elsevier BV
Date: 03-2020
Publisher: MDPI AG
Date: 18-11-2019
DOI: 10.3390/S19225036
Abstract: Due to hot toxic smoke and unknown risks under fire conditions, detection and relevant reconnaissance are significant in avoiding casualties. A fire reconnaissance robot was therefore developed to assist in the problem by offering important fire information to fire fighters. The robot consists of three main systems, a display operating system, video surveillance, and mapping and positioning navigation. Augmented reality (AR) goggle technology with a display operating system was also developed to free fire fighters’ hands, which enables them to focus on rescuing processes and not system operation. Considering smoke disturbance, a thermal imaging video surveillance system was included to extract information from the complicated fire conditions. Meanwhile, a simultaneous localization and mapping (SLAM) technology was adopted to build the map, together with the help of a mapping and positioning navigation system. This can provide a real-time map under the rapidly changing fire conditions to guide the fire fighters to the fire sources or the trapped occupants. Based on our experiments, it was found that all the tested system components work quite well under the fire conditions, while the video surveillance system produces clear images under dense smoke and a high-temperature environment SLAM shows a high accuracy with an average error of less than 3.43% the positioning accuracy error is 0.31 m and the maximum error for the navigation system is 3.48%. The developed fire reconnaissance robot can provide a practically important platform to improve fire rescue efficiency to reduce the fire casualties of fire fighters.
Publisher: Wiley
Date: 18-11-2019
DOI: 10.1002/PRS.12109
Publisher: MDPI AG
Date: 04-03-2020
DOI: 10.3390/SU12051961
Abstract: Urban parks are an important component of urban public green space and a public place where a large number of urban residents choose to conduct outdoor activities. An important factor attracting people to visit and stay in urban parks is its outdoor thermal comfort, which is also an important criterion for evaluating the liability of the urban environment. In this study, through field meteorological monitoring and a questionnaire survey, outdoor thermal comfort of different types of landscape space in urban parks in Chengdu, China was studied in winter and summer. Result indicated that (1) different types of landscape spaces have different thermal comforts, (2) air temperature is the most important factor affecting outdoor thermal comfort (3) because the thermal sensation judgment of outdoor thermal comfort research in Chengdu area, an ASHRAE seven-sites scale can be used (4) the neutral temperature ranges of Physiological Equivalent Temperature (PET) and Universal Thermal Climate Index (UTCI) in Chengdu in winter and summer were obtained through research (5) and UTCI is the best index for evaluating outdoor thermal comfort in Chengdu. These findings provide theoretical benchmarks and technical references for urban planners and landscape designers to optimize outdoor thermal comfort in urban areas to establish a more comfortable and healthy living environment for urban residents.
Publisher: SAGE Publications
Date: 07-2019
Abstract: Critical ventilation velocity is an important parameter for the design of road tunnel, while the situation of two fire sources should be considered due to the high probability of two crashed vehicles or fire propagation. The influences of separating distance between two fire sources on the critical ventilation velocity were investigated numerically after the experimental validation of numerical tool. The trend of the dimensionless critical velocity along the separating distance can be ided into three regions, including limited influence, fast decrease, and slight fluctuation. As the separating distance keeps increasing, the fire plumes transform from completely merged to completely separate. The different merging behaviors of fire plumes are the main reasons of showing various critical ventilation velocities with different separating distances. Finally, an empirical model was developed to predict the dimensionless critical ventilation velocity of double fire sources with different separating distances in the longitudinally ventilated road tunnel.
Publisher: Springer Science and Business Media LLC
Date: 25-03-2020
Publisher: Elsevier BV
Date: 08-2019
Publisher: Begell House
Date: 2020
Publisher: Elsevier BV
Date: 07-2017
Publisher: Informa UK Limited
Date: 14-07-2019
Publisher: Springer Science and Business Media LLC
Date: 11-2018
Publisher: Elsevier BV
Date: 06-2020
Publisher: Elsevier BV
Date: 10-2018
Publisher: Springer Science and Business Media LLC
Date: 26-11-2018
Publisher: Elsevier BV
Date: 12-2023
Publisher: Elsevier BV
Date: 12-2012
Publisher: Elsevier BV
Date: 2017
Publisher: Springer Science and Business Media LLC
Date: 22-07-2020
Publisher: Elsevier BV
Date: 09-2017
Publisher: Elsevier BV
Date: 08-2020
Publisher: Elsevier BV
Date: 11-2020
Publisher: Springer Science and Business Media LLC
Date: 03-2017
Publisher: Elsevier BV
Date: 03-2018
Publisher: Elsevier BV
Date: 02-2018
Publisher: Springer Science and Business Media LLC
Date: 17-06-2012
Publisher: Springer Science and Business Media LLC
Date: 10-2020
Publisher: Elsevier BV
Date: 08-2016
Publisher: IOP Publishing
Date: 27-09-2019
Publisher: Elsevier BV
Date: 2021
Publisher: Elsevier BV
Date: 04-2013
Publisher: SAGE Publications
Date: 19-01-2012
Abstract: Six species of wood s les, namely, pine, beech, cherry, oak, maple, and ash, were investigated by autoignition in a cone calorimeter to identify the influence of moisture on autoignition. It was observed that (1) for autoignition, as different from piloted ignition, there is no obvious trend in ignition temperature when moisture content increases from 0% to 11% (2) ignition temperature decreases with a higher external heat flux, and the influence of specimen thickness to the ignition temperature can be ignored (3) ignition time correlates linearly with [Formula: see text], and the coefficient rises with the increase of moisture content and (4) the influence of moisture to the average mass loss rate and time at 50% mass loss can be ignored if the moisture content of wood s le is lower than 11%.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8TA07790H
Abstract: Polyhedral carbon-coated structural N-CoS 2 @C nanoparticles are synthesized by a facile one-pot solvothermal technique and exhibit excellent sodium ion storage performance.
Publisher: Elsevier BV
Date: 07-2019
DOI: 10.1016/J.JHAZMAT.2019.03.112
Abstract: In this work, we utilized Al(OH)
Publisher: Elsevier BV
Date: 08-2018
Publisher: Elsevier BV
Date: 12-2016
Publisher: The Electrochemical Society
Date: 2016
DOI: 10.1149/2.0721609JES
Publisher: Elsevier BV
Date: 10-2019
Publisher: Springer Science and Business Media LLC
Date: 02-11-2019
Publisher: Elsevier BV
Date: 2018
Publisher: Wiley
Date: 05-02-2020
DOI: 10.1002/FAM.2804
Publisher: Springer Science and Business Media LLC
Date: 26-06-2019
Publisher: Elsevier BV
Date: 05-2019
DOI: 10.1016/J.JHAZMAT.2019.02.041
Abstract: Tunnel fires are usually accompanied with major casualties and properties losses, and multiple fires in a tunnel may cause intense burning behavior like fire merging, which could be more destructive and hazardous. Therefore, the characteristics and hazards of multiple pool fires in a tunnel were investigated under natural ventilation in this study through a series of experiments. Experimental results showed that the characteristics of one-dimensional fire arrays were different from those of square fire arrays in open space. Due to the extra heat feedbacks (e.g. from adjacent fire sources, tunnel wall and hot smoke), the burning rate was found being enhanced. When there is more than one fire source, it was observed that the flames deflect towards the center of one-dimensional fire arrays, leading to flame merging when fire spacing decrease to some extent, which would result in the increased hazards of the heptane fires. An empirical model was developed to predict the global dimensionless average burning rates based on modified fire area ratio, which characterizes the fuel load and incorporated fire spacing, fire number and the fuel pan size. The research results in this paper provide a theoretical guide on understanding the behaviors of multiple fire resources in tunnels.
Publisher: Elsevier BV
Date: 02-2021
Publisher: Elsevier BV
Date: 08-2023
Publisher: Elsevier BV
Date: 03-2021
Publisher: Elsevier BV
Date: 04-2009
Publisher: Elsevier BV
Date: 10-2017
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8NR06959J
Abstract: Nanoflower-like N–C/CoS 2 composites are synthesized by a facile one-pot solvothermal technique, exhibiting excellent sodium ion storage performance.
Publisher: Elsevier BV
Date: 07-2018
Publisher: SAGE Publications
Date: 2009
DOI: 10.2190/AF.19.1.B
Publisher: SAGE Publications
Date: 2009
DOI: 10.2190/AF.19.1.C
Publisher: SAGE Publications
Date: 2009
DOI: 10.2190/AF.19.1.D
Publisher: Elsevier BV
Date: 07-2020
Publisher: SAGE Publications
Date: 03-08-2023
DOI: 10.1177/1420326X211035557
Abstract: Timber is one of the most frequently adopted combustible materials in the built environment. The thermal properties are the determining factors for assessing the fire risk in a building. The main thermal properties of timber and their char are reviewed, especially those temperature-dependent and moisture-dependent properties, including kinetic properties, ignition properties, thermal conductivity, specific heat capacity, effective heat of combustion and thermal diffusivity. The study has collected and summarized various thermal properties data and empirical models of hardwood and softwood with different mass percentages in cellulose, hemicellulose and lignin, as temperature increases. The average ignition temperature and effective heat of combustion of softwood are about 12.9% and 9.5% higher than those of hardwood, respectively. From most of the previous models, the thermal conductivity of timber char increases as temperature rises. Cellulose with a high density shows a higher thermal conductivity, but its impacts on the specific heat capacity are limited. Models to predict the main thermal properties of the hardwood, softwood and char are recommended. The collected data, together with those empirical models, can provide useful data resources and tools for the related fire risk assessments.
Publisher: Elsevier BV
Date: 07-2016
Publisher: Elsevier BV
Date: 02-2019
Publisher: MDPI AG
Date: 14-06-2018
DOI: 10.3390/EN11061570
Publisher: Elsevier BV
Date: 2013
Publisher: Elsevier BV
Date: 2013
Publisher: Elsevier BV
Date: 07-2018
Publisher: MDPI AG
Date: 13-10-2015
DOI: 10.3390/POLYM7101495
Publisher: Elsevier BV
Date: 10-2013
Publisher: Elsevier BV
Date: 03-2021
Publisher: Elsevier BV
Date: 05-2019
DOI: 10.1016/J.JHAZMAT.2019.02.065
Abstract: Upholstered furniture usually has a typical two-layer structure with an ultra-thin surface layer. The surface layer can significantly affect the overall fire behaviors of the upholstered furniture. A series of experiments were carried out to investigate the fire behaviors of six two-layer combustibles based on a cone calorimeter. An empirical model was proposed to predict the heat release rate of two-layer combustibles. The predictions of the model are fitting quite well with experimental data. It was also known that the ignition time of the two-layer combustis dbles is controlled by those surface fabric materials. The shrink rate and the properties of the residues of those surface fabrics show obvious influences on the combustion processes. Comparing to those uncovered natural latex foam s les, it was known that the peak heat release rate decreases about 26.9% and 11.7% for the s les with natural and synthetic species covers, respectively and the duration of the burning process increases about 41.7% and 15.4%, respectively. A combustion factor was proposed and a heat transfer model was developed to reflect the contribution of the surface and the second layers to the combustion processes. The combustion factor is within 0.7-0.9 for the six types of surface fabrics.
Publisher: Elsevier BV
Date: 04-2017
Publisher: SAGE Publications
Date: 05-10-2017
Abstract: Vertical shaft is one of the most important approaches for smoke control under tunnel fires. However, the boundary layer separation is a common phenomenon of h ering the smoke exhaust for vertical shafts. A tilted shaft has been proposed to solve problems and improve the capacity of smoke exhaust. In this study, the effect of shaft inclination angle (θ decreases from 90° to 14°) and shaft height on the capacity of smoke exhaust was addressed numerically. A series of scenarios were simulated in a full-scale road tunnel. Numerical results showed that the tilted shaft could eliminate the boundary layer separation. However, small shaft inclination angle could lead to a relatively higher resistance to the smoke and a smaller cross-section area of shaft, which could have an adverse effect on the capacity. Under these two factors, an optimal inclination angle exists in the shaft of around 76° in this study. Based on the smoke flow characteristics and exhaust effect, the inclination angle was roughly ided into three regions. The main influence factor of the inclination angle on the mass flow rate of smoke in each region was examined. For a comprehensive consideration, the low and slightly tilted shaft was applied to tunnel fires, which can improve the capacity of smoke exhaust obviously.
Publisher: Elsevier BV
Date: 10-2019
Publisher: Elsevier BV
Date: 08-2020
Publisher: Informa UK Limited
Date: 17-01-2020
Publisher: Springer Science and Business Media LLC
Date: 25-04-2017
Publisher: Elsevier BV
Date: 03-2017
Publisher: Springer Science and Business Media LLC
Date: 26-07-2016
Publisher: Springer Science and Business Media LLC
Date: 11-02-2019
Publisher: Elsevier BV
Date: 04-2020
Publisher: Informa UK Limited
Date: 27-02-2020
Publisher: Elsevier BV
Date: 02-2021
Publisher: MDPI AG
Date: 10-12-2018
DOI: 10.3390/S18124366
Abstract: Low visibility and hot smoke environment under fire conditions can largely h er the related fire rescue processes. Ultrasound obstacle avoidance technology is then useful for guidance. However, the biggest challenge of adopting ultrasound technology comes from accurate distance measurements under the disturbances of high temperature and soot particle concentration. It is critical to measure the propagation speed under the complicated fire conditions. Therefore, in this study, a baffle calibration method was proposed to improve the accuracy of distance measurement of an obstacle. The method is based on two ultrasound measurement systems, while one is used to calibrate the propagation speed of ultrasound based on the fixed distanced baffle and the other is for the dynamic measurement of obstacle distance based on the calibrated speed. The viability of this method on the guided vehicle was confirmed based on the experiments. From its comparison to those existing methods, such as constant speed and temperature compensation methods, it was known from that the proposed baffle calibration method provides the best prediction. It was obtained that the maximum errors based on the baffle calibration method are 2.75% and 2.62% under the two representative fire scenarios, respectively, which are much lower than those of constant speed (7.81% and 8.4%) and temperature compensation methods (10.4% and 5.12%).
Publisher: Elsevier BV
Date: 12-2018
Publisher: Springer Science and Business Media LLC
Date: 23-06-2020
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 2012
Publisher: Elsevier BV
Date: 03-2018
Publisher: Elsevier BV
Date: 03-2020
Publisher: Elsevier BV
Date: 06-2018
Start Date: 04-2020
End Date: 12-2023
Amount: $419,889.00
Funder: Australian Research Council
View Funded Activity