Showing papers by "Kian Jon Chua published in 2013"
TL;DR: In this article, air conditioning is essential for maintaining thermal comfort in indoor environments, particularly for hot and humid climates, and it has been shown that air conditioning, comprising cooling and dehumidification, has a significant impact on thermal comfort.
714 citations
TL;DR: In this paper, an experimental study was conducted on a Euro IV diesel engine to evaluate the performance, combustion and emission characteristics of pure biodiesel and its blend fuels, and the results showed that the use of biodiesel/blend fuels resulted in a higher brake specific fuel consumption, especially at low engine speed and partial load conditions.
183 citations
TL;DR: In this article, the performance and emissions of the diesel engine fueled by the emulsion fuel are tested and compared with that of pure diesel, and the results indicate that a better brake thermal efficiency can be achieved with the EM fuel.
163 citations
TL;DR: In this paper, a new type of biofuel, pine oil, is introduced for the purpose of fueling diesel engine, which can be directly used in diesel engine without trans-esterifying it.
156 citations
TL;DR: In this paper, a novel emulsion fuel with nano-organic additives is introduced, which is transparent and light green with superior stability, and the performance and emissions of a diesel engine with common-rail fuel supply system are tested and compared with pure diesel.
130 citations
TL;DR: In this article, a detailed physical properties prediction for the five major methyl esters of biodiesel for combustion modeling is presented. And the best prediction model has been identified, and very good agreements have been obtained between the predicted results and the published data where available.
89 citations
TL;DR: In this paper, the authors explored the possibility of using kapok oil as a source for biodiesel production and experimentally investigated it, KME (kapokoil methyl ester), as a diesel engine fuel.
83 citations
TL;DR: In this article, the authors proposed pine oil biofuel, a renewable fuel obtained from the resins of pine tree, as a potential substitute fuel for a diesel engine, which has enhanced physical and thermal properties such as lower viscosity and boiling point, which enhances the atomization and fuel/air mixing process.
68 citations
TL;DR: In this article, a hydrogen-fueled micro-combustion system for thermophotovoltaic application is presented, and the thermal performances of the microcombustor with and without baffles have been investigated numerically and experimentally.
67 citations
TL;DR: In this article, a multi-dimensional computational fluid dynamics (CFD) modeling was conducted on a direct injection turbo-charged diesel engine based on KIVA-4 code under full and mid engine loads.
62 citations
TL;DR: In this article, the performance, combustion and emission characteristics of a hydrogen assisted diesel engine under various operating conditions were numerically studied using multi-dimensional software KIVA4 coupled with CHEMKIN.
TL;DR: A theoretical analysis on entropy generation in H2/air premixed flame is presented in this paper, where the entropy transport equation is employed to evaluate the entropy generation rate caused by various irreversible processes such as chemical reaction, conduction, mass diffusion and viscous dissipation.
TL;DR: Key results have confirmed that while certain nanoparticles act as therapeutic freezing agents that promote cryoablation, others are capable of protecting surrounding healthy tissue.
TL;DR: In this paper, an enhanced system that stabilizes freezing medium's pressure and flow rate was proposed to enhance the temperature control of the cryoprobe, which could improve the accuracy of the freezing delivery.
TL;DR: Evaluating the hybrid cryoprobe's control ability, it was shown that the proposed device was able to regulate the growth of the ice front while sustaining an excellent coverage of the ablation zone, and noted the existence of a diminishing temperature effect when alternate freeze-thaw cycles were applied.
14 Jul 2013
TL;DR: In this paper, three types of emulsion fuels with different water concentrations (5, 10% and 15% mass water) are produced and tested and the results indicate that the water droplets enclosed in the emulsion fuel explode at high temperature environment and help to break up the big oil droplets into smaller ones, thereby significantly increase the surface area of the oil droplet and enhance the heat transfer from hot gas to the fuel.
Abstract: Transportation is one of the major contributors to the world’s energy consumption and greenhouse gases emissions. The need for increased efficiency has placed diesel engine in the spotlight due to its superior thermal efficiency and fuel economy over gasoline engine. However, diesel engines also face the major disadvantage of increased NOx emissions. To address this issue, three types of emulsion fuels with different water concentrations (5%, 10% and 15% mass water) are produced and tested. Novel organic materials (glycerin and ployethoxy-ester) are added in the fuel to provide extra oxygen for improving combustion. NP-15 is added as surfactant which can help to reduce the oil and water surface tension, activates their surface, and maximizes their superficial contact areas, thereby forming a continuous and finely dispersed droplets phase. The stability of the emulsion fuels is tested under various environmental temperature for one year, and no significant separation is observed. It is better than normal emulsion fuel which can only maintain the state for up to three months. The combustion process and performance of the emulsion fuels are tested in a four-stroke, four cylinder diesel engine. The results indicate that the water droplets enclosed in the emulsion fuel explode at high temperature environment and help to break up the big oil droplets into smaller ones, thereby significantly increase the surface area of the oil droplets and enhance the heat transfer from hot gas to the fuel. As a result, the fuel evaporation is improved and the combustion process is accelerated, leading to an improved brake thermal efficiency (up to 14.2%). Meanwhile, the presence of the water causes the peak temperature of the flame to drop, thereby significantly bringing down the NOx emissions by more than 30%.Copyright © 2013 by ASME