Siti Nor Azreen Ahmad Termizi
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Preferred name
Siti Nor Azreen Ahmad Termizi
Official Name
Siti Nor Azreen, Ahmad Termizi
Alternative Name
Ahmad Termizi, S. N.A.
Termizi, S. N.A.Ahmad
Termizi, Siti Nor Azreen Ahmad
Main Affiliation
Scopus Author ID
57000566700
Researcher ID
GXA-2631-2022

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  • Publication
    Potential Impact of Climate Change on Hydropower System in Malaysia
    ( 2023-01-01)
    Ibrahim N.A.
    ;
    Alwi S.R.W.
    ;
    Manan Z.A.
    ;
    Mustaffa A.A.
    ;
    Siti Nor Azreen Ahmad Termizi
    ;
    Kidam K.
    Hydropower emerged as the predominant renewable source, constituting 83.3 % of the overall renewable electricity generated and contributing to 15.9 % of the total electricity output in Malaysia. The adverse effects of climate change, including extreme temperature and precipitation events, pose challenges to the performance and infrastructure of the hydropower plant. The main objective of this research is to investigate the potential ramifications of climate change on hydropower generation in Malaysia, with a particular emphasis on the projected impacts of temperature and precipitation changes. Data from ClimateAP software using global climate models are used to estimate the percentage changes in annual average temperature by 2070 under high emissions scenarios in comparison to baseline data from the end of the 20th century. The heat map was used to show the projected maximum temperature and precipitation across Malaysia under the Radiative Concentration Pathways 8.5 scenario. The hydraulic power generated formula was modified to determine the relationship between climate change and power generation. The findings reveal that an increase in temperature reduces power generation while an increase in precipitation increases energy production. Enhancements, additional analysis, and validation of these findings would help mitigate climate change and provide valuable insight into hydropower systems.
  • Publication
    Simulation Based Optimization of Shrinkage in Injection Molding Process for Lamp Holder via Taguchi Method
    ( 2021-01-01)
    Khor Chu Yee
    ;
    Mohd Al-Hafiz Mohd Nawi
    ;
    Ishak M.I.
    ;
    Low B.A.
    ;
    Rosli M.U.
    ;
    Siti Nor Azreen Ahmad Termizi
    Defect minimization is important in any injection molding process in order to ensure the quality of the injected part or product. The aims of the present study are to determine the optimum processing parameters and to identify the most significant factor during the injection molding process for the lamp holder via Taguchi method. The numerical simulation analysis of injection molding process was carried out by software. The set of numerical simulation for different parameters was designed by L18 Orthogonal array. Six process parameters were considered, which are melting temperature, injection time, cooling time, filling time, injection pressure and filling pressure. The main response of the study is volumetric shrinkage. Main effect and ANOVA analysis were also highlighted in this study. Filling pressure and melting temperature are the most significant factor in the injection molding process of the lamp holder. The present study revealed the setting of process parameters (i.e., 334 °C melting temperature, 0.16 s of injection time, cooling time with 50, 20 s of filling time, 18.65 MPa of injection pressure and 90 MPa of filling pressure) yield the optimum quality of the lamp holder.
  • Publication
    A Short Review on Multi-stage Application in Fluidization Systems
    ( 2021-01-01)
    Silmie M.S.M.
    ;
    Mohd Al-Hafiz Mohd Nawi
    ;
    Ishak M.I.
    ;
    Rosli M.U.
    ;
    Siti Nor Azreen Ahmad Termizi
    ;
    Khor Chu Yee
    ;
    Faris M.A.
    ;
    Marzuki M.A.B.
    This research focuses on the implementation of an approach of multi-stage in fluidization systems in various aspects. The multi-stage fluidized bed has been proposed to improve the process and function of fluidization systems based on the current of the single-stage methods. The detailed of single-stage fluidization interaction method provides a realistic visualization of airflow and fluidization system interaction. In this article, a variant application, involving in multi-stage fluidized bed has been reviewed. In a few articles were analyzed, each manuscript was evaluated based on the scientific work via fluidization systems. The experimental study and analysis of airflow characteristics was a valuable tool to understand this phenomenon of the multi-stage fluidized bed process. Then the parameter, flow properties, activities of the multi-stage fluidized bed systems have been considered to the current swirling fluidized bed being applied to study. As a result of this short review, each multi-stage fluidized bed has its capability and suitability for its products and studies. Finally, the concentration of multi-stage fluidized bed is also highlighted in these manuscripts.
  • Publication
    Agent-Based Modelling Analysis on the Potential Economic Benefits of Mud Cake Waste to Wealth
    ( 2023-01-01)
    Siti Nor Azreen Ahmad Termizi
    ;
    Alwi S.R.W.
    ;
    Manan Z.A.
    ;
    Varbanov P.S.
    Production of refined sugar generates a significant amount of mud cake waste which has traditionally been managed through disposal in landfills. Such practice is not sustainable and can have negative environmental impacts. While previous research has primarily focused on evaluating the environmental and economic impacts of bagasse, less attention has been given to mud cake waste. By applying the waste-to-wealth concept and promoting a circular economy, this study aims to evaluate the potential economic benefits of using mud cake waste as an alternative raw material in cement production. To assess the potential economic benefits, the study employs an agent-based modelling analysis that simulates the actions and interactions of multiple agents. The results of the analysis demonstrate the potential economic benefits of mud cake waste exchange for both sugar producers and cement manufacturers. The concept of a win-win scenario is emphasized, where both parties share an equal amount of exchange costs and reap mutual benefits in cost savings, improved resource efficiency, and reduced environmental impacts by reducing the amount of waste being disposed of to the landfill.
  • Publication
    Influence of Twisted Blades Distributor Towards Low Pressure Drop in Fluidization Systems
    ( 2021-01-01)
    Zulkifli R.M.
    ;
    Mohd Al-Hafiz Mohd Nawi
    ;
    Ishak M.I.
    ;
    Rosli M.U.
    ;
    Siti Nor Azreen Ahmad Termizi
    ;
    Khor Chu Yee
    ;
    Faris M.A.
    Swirling Fluidized Bed (SFB) is one of the systems that proposed vortexing to solid mixing due to a given gas source which impart on the solid mixing. This system is usually be used in the power generation, chemical industry, material production and drying processes. However, the used of blade distributor in SFB is still produced high-pressure drop even though it has been claimed the successful variant in fluidization systems. By using an annular blade distributor in a twist, the condition will cause in low-pressure drop and keep the energy consumption of a fluidized bed system in high efficient. The simulation study using Computational Fluid Dynamics (CFD) has been selected to investigate to the behaviour of velocity component and to determine the effects of the plenum chamber (axial entry) on airflow behaviour via twist blade distributor configurations. This study uses two (2) twist angle (80 and 100°) via several blade number 40, 50 and 60. Therefore low-pressure drop and high uniform velocity has be the main goal in this observation. The result of this study found that design on 100° twist angle via 40 number of blades distributor shows low a pressure drop besides being able to maintain the high airflow uniformity compared to other configurations.
  • Publication
    Kinetics Analysis on Catalytic Pyrolysis of Empty Fruit Bunch (EFB) with Copper Oxide Doped Aluminium Oxide (CuO/Al2O3) Catalyst
    ( 2020-12-18)
    Alina Rahayu Mohamed
    ;
    Zin A.M.
    ;
    Siti Nor Azreen Ahmad Termizi
    ;
    Khairunissa Syairah Ahmad Sohaimi
    ;
    Izhar N.I.I.N.
    This study focuses on dynamic non-catalytic and catalytic pyrolysis of empty fruit bunch (EFB) with copper oxide doped aluminium oxide (CuO/Al2O3) at linear ramp rates of 10, 15, 20, 25, 30 and 40 Cmin-1 at pyrolysis temperature of 28-1000 C in a thermogravimetric analyzer (TGA). The thermogravimetric profiles for the thermochemical breakdown of EFB under non-catalytic and catalytic pyrolysis with CuO/Al2O3 comprise of three different levels. The kinetics analysis for the reactions were evaluated using the Kissinger and Ozawa methods. The values of activation energy (Ea) for non-catalytic EFB pyrolysis were 167.95 and 177.68 kJmol-1 based on Kissinger and Ozawa methods respectively. For catalytic pyrolysis with approximately 9.09 wt% CuO/Al2O3 catalyst, the values of Ea reduced to 127.72 and 137.42 kJmol-1 by Kissinger and Ozawa methods respectively. These values indicate that the presence of 9.09 wt% CuO/Al2O3 catalyst has successfully reduced Ea value for the EFB pyrolysis reaction.
  • Publication
    Numerical Simulation of Biodiesel Synthesis in T- Channel Microreactor
    ( 2020-07-09)
    Siti Nor Azreen Ahmad Termizi
    ;
    Khor Chu Yee
    ;
    Mohd Al-Hafiz Mohd Nawi
    ;
    Syafiqah Binti Mohd Aris N.
    ;
    Muhammad Ikman Ishak
    ;
    Rosli M.U.
    Biodiesel promising as an alternative to the diesel. The transesterification reaction process involved the reaction of triglyceride with alcohol in the presence of catalyst. In the research, the Computational Fluid Dynamic (CFD) method was used to simulate the transesterification reaction process. The inlet pressure range from 0.0001 Pa to 0.01 Pa, temperature of 25°C, 50°C, 75°C and the molar ratio at 6:1, 9:1 were used to investigate their effect of toward the biodiesel conversion. Finding shows that high conversion of biodiesel occurred at low inlet pressure of 0.001 Pa with temperature of 50°C and the ethanol to oil molar ratio at 9:1.
  • Publication
    Conceptual Design Selection of Motorcycle Handle Brake Lever Component by TRIZ and Simulation
    ( 2021-01-01)
    Rosli M.U.
    ;
    Siti Nor Azreen Ahmad Termizi
    ;
    Khor Chu Yee
    ;
    Mohd Al-Hafiz Mohd Nawi
    ;
    Chong C.S.
    ;
    Ishak M.I.
    The fuel consumption of vehicles can be affected by the weight of the vehicle. Trending on replacing the metal part or product with lighter composite material has emerged. By using polymer composite instead of metal material in producing an automotive component, the total weight of the vehicle will be reduced. This research aims to develop the conceptual designs of new lighter weight motorcycle handle brake lever by integrating Theory of Inventive Problem Solving (TRIZ) and FEA simulation. This research generates the best concept design based on user needs and product design specifications. TRIZ contradiction matrix and 40 inventive principles solution were applied in the early solution generation stage. The principle solution parameters for the specific design features were later refined using Morphological Chart to systematically develop numbers of concept design. After numbers of significant FEA simulation, decision-making processes are performed in selecting the most appropriate concept design. A design was selected as the best conceptual design as it has scored the highest in the concept rating. This research proves the significant contribution of integrating TRIZ and FEA simulation that will benefit the industry in conceptual design phase of producing a new product.
  • Publication
    Optimisation of Process Parameters in Plastic Injection Moulding Simulation for Blower Impeller’s Fan Using Response Surface Methodology
    ( 2021-01-01)
    Rosli M.U.
    ;
    Siti Nor Azreen Ahmad Termizi
    ;
    Khor Chu Yee
    ;
    Nawi M.A.M.
    ;
    Omar A.A.
    ;
    Ishak M.I.
    Injection moulding process parameters such as moulding temperature, melt temperature, injection pressure, and injection time have a direct impact on the quality and cost of polymer products especially in a thin and highly complex product. In any case, the improvement of these parameters is a difficult and challenging task. Thus, a good parameter setting combination through simulation and optimisation is highly required. Response Surface Methodology (RSM) is utilized as optimisation method in finding the significant factor and recommended settings in minimizing the defects of volumetric shrinkage and warpage on plastic blower impeller’s fan. In simulations, three levels of melting temperature, moulding temperature, injection time and injection pressure processing parameters are selected. The material used is Polypropylene (PP). The result showed the optimum values suggested by the software are melt temperature of 210 °C, moulding temperature of 110 °C, cooling time of 0.8 s and injection pressure of 212.81 MPa. With below 15% differences error value between recommended setting and simulation, the result was in acceptable and shows RSM ability in finding the optimal setting in producing the part.
  • Publication
    Effect of heat sink design on the thermal characteristic in computational fluid dynamics analysis
    ( 2020-12-18)
    Khor Chu Yee
    ;
    Mohd Al-Hafiz Mohd Nawi
    ;
    Ishak M.I.
    ;
    Kee W.C.
    ;
    Rosli M.U.
    ;
    Mohd Riduan Jamalludin
    ;
    Siti Nor Azreen Ahmad Termizi
    The thermal management in the electronic device or system using the heat sink is important to ensure the device or system operating under the allowable temperature. The present study aims to investigate the thermal characteristic (i.e., temperature distribution) of the various heat sink designs via computational fluid dynamics (CFD) analysis. The electronic cooling process of the heat sink is carried out via CFD software. The temperature distribution of the various heat sink designs (i.e., plate fin, circular pin fin and rectangular fin) was analyzed and compared. The CFD analysis revealed the plate fin heat sink has lowest temperature distribution on the fin region. High temperature distribution was observed on the pin fin heat sink. The non-uniform temperature distribution was attributed by the direction of inlet airflow, whereas the low temperature was found in the region that close to the inlet airflow. Thus, the research findings indicated the design of heat sink significantly affects the temperature distribution during the electronic cooling process.