Papers by Author: Shaharin Anwar Sulaiman

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Authors: H.A. Harun, Norsheila Buyamin, Mohamad Asyraf Othman, Shaharin Anwar Sulaiman
Abstract: The indoor environment of lecture rooms in universities can affect the learning of students. Nevertheless, study on the actual conditions of air in relation to indoor air quality is rare. This paper presents a case study on the indoor comfort of selected lecture rooms in a university. Two rooms of different sizes and ventilation rates were selected, in which the indoors air temperature, CO2 content and relative humidity were measured both when occupied and unoccupied. The study revealed that occupancy by students did not directly affect the relative humidity in the lecture rooms, probably due to the dominating influence of the outdoor air. It was found from the study that under high occupancy, the room temperature and CO2 content would be higher than the recommended level and thus affected the comfort level of students and consequently their learning ability during the lecture.
Authors: Ahmad Nazri Azmarini, Suhana Ab. Majid, Supa’at Hj Zakaria, Shaharin Anwar Sulaiman
Abstract: ndoor Air Quality (IAQ) has become an important occupational health and safety concern in educational environment at institutions of higher learning. In a survey conducted on a polytechnic in Malaysia, many of the students and lecturers expressed feeling of discomfort and uneasy due to resulting smoke from the welding activities while attending the workshop session. They felt that the room temperature and humidity also contributed to discomfort. Consequently, students had difficulties to concentrate and focus on their learning. The objective of this study was to determine the indoor air quality of a selected welding laboratory in the polytechnic comprising arc and gas welding stations. The important IAQ parameters considered in this study were the dry bulb air temperature, relative humidity, CO2 level and dust particles. Measurements were conducted using commercial IAQ instruments. From the study it was found that the levels of dust particles was higher than the recommended limit at times in the arc welding station. The CO2 level was observed acceptable in both welding stations. On relative humidity, a mixed result was found. Overall, the results implied that the welding laboratory require attention in meeting acceptable Indoor Air Quality.
Authors: Bridgid Chin Lai Fui, Suzana Yusup, Ahmed Al Shoaibi, Pravin Kannan, Chandrasekar Srinivasakannan, Shaharin Anwar Sulaiman
Abstract: In this present study, the gasification kinetics of rubber seed shell, high density polyethylene, and their mixtures (20/80 and 40/60 weight ratio of HDPE/RSS) are investigated using a non-isothermal thermogravimetric analysis (TGA) system at heating rate of 10 K/min in the temperature range of 323-1173 K. The argon gas is supplied at a flowrate of 100 ml/min and the steam is generated from superheater at 383 K. The steam is injected at flowrate of 300 μL/hour into the TGA system. The Criado and Coats-Redfern methods are used to investigate the reliability of the determined value of the activation energy, EA from the experimental data of TGA. The interaction of solid-phase components based on the mentioned experimental conditions is also studied.
Authors: Fiseha Mekonnen Guangul, Shaharin Anwar Sulaiman, Anita Ramli
Abstract: Hydrogen is one of the most abundant elements in the universe and a clean carrier of energy. However, the existence of hydrogen is in different compound forms, in which a great deal of energy is required to split from the compounds. Gasification of biomass is one of the best methods to produce hydrogen. This study focuses on the production of hydrogen in gasification process by using a throated downdraft gasifier and preheated air as gasifying agent. For the study on the effect of gasifying air temperature on hydrogen concentration in the syngas an electric heater was used to preheat the inlet air up to 500°C. The results of the study showed that increasing the gasifying air temperature from 30°C to 500°C increased the volume concentration of hydrogen by 25.1% in the syngas. The increase in hydrogen was steeper when the inlet air was in the lower range temperature (30 to 265°C) as compared to that of the upper range (265 to 500°C).
Authors: Muhammad Yasin Naz, Shaharin Anwar Sulaiman, Bambang Ari-Wahjoedi, Ku Zilati Ku Shaari
Abstract: The use of starches as a material in urea granules coating industry is a recent development. The pure starches do not meet the standards set by many industrial processes due to slow tacking and to low viscosities, and require necessary modifications in their physical properties. The objective of the work was to synthesize and characterize the tapioca base biopolymers for future urea granules coating applications. For this purpose, three compositions of starch-urea-borate complex were prepared and their sprays were characterized using a bottom to top spraying system. The characterization of physical properties of the synthesized starch adhesives was carried out by determining the effect of temperature, shear rate and mass concentration of thickener/stabilizer on solution viscosity. A shear-thinning behavior followed by shear-thickening was observed for all solution compositions. This shear thinning to shear thickening transition becomes less prominent above 80°C of solution heating temperature. Using a high speed camera (Phantom v9.1), the jet breakup dynamics were also visualized as a function of the solution temperature and pumping pressure. . An increasing trend was noticed in spray cone angle with temperature upto 80°C and thereafter it became almost constant. Similarly, a linear increase in spray tip penetration was noticed with time from start of the injection which became steady after 70 ms of injection time.
Authors: Muhammad Yasin Naz, Shaharin Anwar Sulaiman, Bambang Ari-Wahjoedi
Abstract: In this paper, an attempt was made to integrate the effect of jet injection time, load pressure and solution physical properties on jet breakup parameters. A starch-urea-borax complex solution was prepared and tested with an axi-symmetric full cone nozzle. The jet injection time was set to 100, 200, 300 and 400, the solution heating temperature was set to 20°C and 80°C ms, the load pressure was set to 1, 2, 3, 4, and 5 bar, and corresponding spray patterns were imaged by using a high speed camera. The imaging study of the developing spray patterns revealed that the unheated solution forms only spinning jets for all used load pressures. No jet breakup was seen in the near and far-nozzle imaged regions except at 5 bar load pressure, where minor spreading in the jet was seen after 80 mm downstream of the nozzle exit. At 80°C temperature and 5 bar load pressure, very dense spray patterns with an increased spray cone angle were emerging from the nozzle. After 300 ms of injection time, these developing spray jets were changed into fine spray patterns.
Authors: Muhammad Yasin Naz, Shaharin Anwar Sulaiman, Bambang Ari-Wahjoedi
Abstract: The presented research work was focused onto the understanding of the jet behavior of the sprays of heated water during the low pressure atomization process. This task was accomplished using an in-house built intermittently forced liquid spraying system capable of lowering the liquid viscosity and surface tension to a desired value and then atomizing it into a full cone spray patterns in the ambient air surrounding. Using a high speed camera, the jet breakup dynamics were visualized as a function of system input parameters. The analysis of the grabbed images confirmed the strong influence of these processing parameters on full cone spray characteristics. It was also predicted that heated liquids generate a dispersed spray pattern by utilizing the partial evaporation of the spraying medium that is the induction of thermal energy enhances the jet disintegration ability. The spray cone width and angle did not vary significantly whereas the Weber and Reynolds numbers along with other nozzle flow parameters showed an appreciable response to the load pressure and temperature at early stages of water injection. The ultimate objective of the work was to understand and control the airless spray jet breakup mechanism under reduced load pressure and high water temperature.
Authors: Mohd Faizal Mohideen, Shaharin Anwar Sulaiman, Vijay Raj Raghavan
Abstract: This paper presents the hydrodynamics of chopped oil palm fronds (OPF) from cold flow experiments carried out in a swirling fluidized bed dryer (SFBD). The chopped OPF was 10 – 15 mm in size and falls in between Geldart type B and D. The OPF which consisted of leaves and petiole (stem) were first separated before studied individually due to their different physical characteristics. 2 bed loadings of 120g and 140g were investigated for bed pressure drop, (ΔPb), minimum fluidization velocity (Umf) and minimum swirling velocity (Ums) while regimes of operation were closely observed. The experiments yield that the OPF leaves and petiole have distinct hydrodynamic behavior due to their different bulk densities and voidage, hence suggesting drying should also be conducted separately unlike the current industrial practice. The leaves have lower Umf and Ums compared to the petiole and thus swirling motion was initiated earlier in SFBD when operating with leaves. Both samples however, have limited operating velocities due to elutriation. In conclusion, the SFBD was found to fluidize the chopped OPF well while providing good solid-gas contact which is highly desired for drying.
Authors: Bridgid Chin Lai Fui, Suzana Yusup, Ahmed Al Shoaibi, Pravin Kannan, Chandrasekar Srinivasakannan, Shaharin Anwar Sulaiman
Abstract: In this paper, the catalytic co-gasification of rubber seed shell and high density polyethylene mixtures (0.2:0.8 weight ratio of HDPE:RSS) are investigated using a non-isothermal thermogravimetric analysis (TGA) system in a range of heating rates of 10, 20, 30 and 50 K/min within the temperature range of 323-1173 K. The argon gas is supplied at a flowrate of 100 ml/min and the steam is generated from superheater at 383 K. The steam is injected at flowrate of 300 μL/hour into the TGA system. A commercial nickel powder is used as the catalyst for the gasification process. The thermal decomposition behavior and synergistic effect of the HDPE/RSS mixture are investigated. The activation energy, EA and pre-exponential factor, A are determined based on one step integral method.
Authors: Nurul Aisyah Mohd Zin, Shaharin Anwar Sulaiman
Abstract: Biomass energy technology such as gasifier is increasingly receiving attention as a promising renewable energy source because of the ever rising costs of fossils fuels especially diesel and kerosene. Gaseous products of gasifier based cookstove are relatively clean and environmental friendly than direct combustion cookstove. The objective of this workwas to characterize the basic operating properties of a gasifier-based biomass cookstove using different types of biomass fuels. The main characteristics evaluated were the efficiencyof the stove. The biomass considered were oil palm fronds, dry leaves and pressed sugarcane. The efficiency of the stove was tested using water boiling tests.Other characteristics such as its ignition duration and the time required to boil 2.5 kg of water were also observed. The performance of each fuel was studied by analyzing the parameters involved during water boiling tests. It was found that oil palm frond has the highest thermal efficiency among all the fuels tested.
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