Papers by Juhari Ab Razak
MATEC Web of Conferences, 2018
A solar photovoltaic (PV) coconut dehusking machine may become one important application of renew... more A solar photovoltaic (PV) coconut dehusking machine may become one important application of renewable energy especially in rural areas like in Sarawak. It will not only enhance the socio-economy in such areas but also indirectly reduce the risk of injuries from the process of dehusking coconuts manually. Thus the purpose of the study is to simulate the performance of the PV coconut dehusking machine by circuit modeling in Simulink and PVsyst software. Simulation results showed that it could match the rpm and torque required in the dry coconut shear test. Furthermore, when implemented, such a PV-powered machine is expected to offer better cost of ownership in the long term when compared to a dehusking machine that runs on fossil fuel based on the PVsyst software analysis.
Article history: Received 30 March 2018 Received in revised form 1 August 2018 Accepted 4 August ... more Article history: Received 30 March 2018 Received in revised form 1 August 2018 Accepted 4 August 2018 Available online 10 September 2018 Hydropower is one of the world leading green alternative energy to produce electricity besides solar and wind energy. Most potential sites for large hydropower scheme in Peninsular Malaysia have been explored. Due to cabling cost and geographical constraints rural electrification program requires in-situ application which make small hydropower scheme more favourable choice. This run-of-river scheme is environmental friendly as no dam is required. Potential locations in Malaysia have been suggested for small hydro turbine applications, which are ideal for eco-friendly tourist industry and remote power supply. The two such sites are Kg. Tual, Raub, Pahang and Gunung Ledang, Tangkak, Johor. The preliminary studies have been conducted at both locations to select suitable hydro turbine based on their head and water flow rate. Altimeter and water velocit...
International Review of Mechanical Engineering (IREME), 2015
The pico-hydro turbine is one hydropower scheme that has been widely used in off-grid settlements... more The pico-hydro turbine is one hydropower scheme that has been widely used in off-grid settlements around the globe. The implementation of this stand-alone system is chosen due to its cost-effectiveness and robustness in producing electricity, under low head conditions. This type of turbine is capable of producing power outputs of up to 5 kW. It is green energy technology that does not require water storage, and the initial set-up is very easy and straight forward. The propeller turbine is one of the most popular types of pico-hydro scheme that have been implemented extensively in remote areas, especially in Asia. However, little research has been conducted regarding the enhancement or development of pico-hydro turbines. This study will review previous research on the propeller hydro turbine, which mostly deals with low head and high flow rate conditions. The main components of the propeller turbine and the basic working principles of the run-of-river type will be highlighted. The conclusions will consider the main components in propeller hydro turbine systems which have been investigated by previous researchers to enhance the efficiency and performance. Suggestions for future studies on the application of the propeller hydro turbine will also be discussed.
Computer based problems solving are the tutorial and assignment that all the problems are solved ... more Computer based problems solving are the tutorial and assignment that all the problems are solved through individual interactive work with a personal computer. Immediate feedback on errors is provided and the grading is done mostly by the computer. The time frame of problems solving can be set so that most students are able to redo the whole problems or selected one using different sets of the data to achieve mastery level. In courses where computer based problems solving was used, a definite improvement in the problem-solving skills of all the students was observed, while the effort for study very hard and grading was actually reduced. To change conventional learning method, some objectives are needed as a step for develop the interactive program, such as considering related platform for e-learning process, developing databases for thermodynamics property tables, deriving several properties of pure substances based thermodynamics equations, and developing interactive interface for self-help tutorial, on-line quizzes.
Applied Mechanics and Materials, 2014
Hydropower is one of the most widely source to produce electricity for domestic houses as well as... more Hydropower is one of the most widely source to produce electricity for domestic houses as well as for industries around the world. However, for those off-grid settlements the pico-hydro scheme is more suitable due to its cost-effectiveness (less maintenance), clean, user-friendly and do not involved with huge construction works. Even the installation of this type of hydropower scheme is very simple as do it yourself (DIY) concept. One of the most popular pico-hydro turbines which have been implemented widely in rural areas until nowadays is propeller type or also known as axial turbine. Propeller turbine is selected because it is suitable to operate under low head with high flow rate condition. However, in this particular case, low head with low flow rate of water are the two main parameters which need to be considered. This is because during dry or drought season the water level of the rivers will become low and fluctuated, and this scenario affected the performance of the propelle...
Off-grid settlements require cheap, efficient, reliable and cost-effective alternative energy to ... more Off-grid settlements require cheap, efficient, reliable and cost-effective alternative energy to the power dominantly supplied by diesel generator. However, most initial capital cost of renewable energy system, especially single source energy, is often considered very costly. Techno-economic analysis is important in the feasibility studies of the renewable energy system in the long run. This paper reviews the application of genetic
World Scientific and Engineering Academy and Society (WSEAS), Apr 1, 2008
Off-grid settlements require efficient, reliable and cost-effective renewable energy as alternati... more Off-grid settlements require efficient, reliable and cost-effective renewable energy as alternative to the power supplied by diesel generator. Techno-economic analysis is required to find the optimum renewable energy system in the long run. This paper reviews the application of genetic algorithms in optimization of hybrid system consisting of pico hydro system, solar photovoltaic modules, diesel generator and battery sets. It is intended to maximize the use of renewable system while limiting the use of diesel generator. Daily load demand is assumed constant for derivation of annual load. Power derived from the hybrid should be able to meet the demand. Local weather data is used and analyzed to assess the technical and economic viability of utilizing the hybrid system. Optimization of the system will be based on the component sizing and the operational strategy. Genetic algorithms programming is used to evaluate both conditions in minimizing the total net present cost for optimum configuration. Manufacturer data for the hybrid components is used in calculation of sizing to represent actual power derivation. Several operation strategies will be considered while forming the vectors for optimum strategy. Random selection of sizing and strategy is used to initiate the solution for the problem which will have the lowest total net present cost. Sensitivity analysis is also performed to optimize the system at different conditions.
MATEC Web of Conferences, 2018
A solar photovoltaic (PV) coconut dehusking machine may become one important application of renew... more A solar photovoltaic (PV) coconut dehusking machine may become one important application of renewable energy especially in rural areas like in Sarawak. It will not only enhance the socio-economy in such areas but also indirectly reduce the risk of injuries from the process of dehusking coconuts manually. Thus the purpose of the study is to simulate the performance of the PV coconut dehusking machine by circuit modeling in Simulink and PVsyst software. Simulation results showed that it could match the rpm and torque required in the dry coconut shear test. Furthermore, when implemented, such a PV-powered machine is expected to offer better cost of ownership in the long term when compared to a dehusking machine that runs on fossil fuel based on the PVsyst software analysis.
Article history: Received 30 March 2018 Received in revised form 1 August 2018 Accepted 4 August ... more Article history: Received 30 March 2018 Received in revised form 1 August 2018 Accepted 4 August 2018 Available online 10 September 2018 Hydropower is one of the world leading green alternative energy to produce electricity besides solar and wind energy. Most potential sites for large hydropower scheme in Peninsular Malaysia have been explored. Due to cabling cost and geographical constraints rural electrification program requires in-situ application which make small hydropower scheme more favourable choice. This run-of-river scheme is environmental friendly as no dam is required. Potential locations in Malaysia have been suggested for small hydro turbine applications, which are ideal for eco-friendly tourist industry and remote power supply. The two such sites are Kg. Tual, Raub, Pahang and Gunung Ledang, Tangkak, Johor. The preliminary studies have been conducted at both locations to select suitable hydro turbine based on their head and water flow rate. Altimeter and water velocit...
International Review of Mechanical Engineering (IREME), 2015
The pico-hydro turbine is one hydropower scheme that has been widely used in off-grid settlements... more The pico-hydro turbine is one hydropower scheme that has been widely used in off-grid settlements around the globe. The implementation of this stand-alone system is chosen due to its cost-effectiveness and robustness in producing electricity, under low head conditions. This type of turbine is capable of producing power outputs of up to 5 kW. It is green energy technology that does not require water storage, and the initial set-up is very easy and straight forward. The propeller turbine is one of the most popular types of pico-hydro scheme that have been implemented extensively in remote areas, especially in Asia. However, little research has been conducted regarding the enhancement or development of pico-hydro turbines. This study will review previous research on the propeller hydro turbine, which mostly deals with low head and high flow rate conditions. The main components of the propeller turbine and the basic working principles of the run-of-river type will be highlighted. The conclusions will consider the main components in propeller hydro turbine systems which have been investigated by previous researchers to enhance the efficiency and performance. Suggestions for future studies on the application of the propeller hydro turbine will also be discussed.
Computer based problems solving are the tutorial and assignment that all the problems are solved ... more Computer based problems solving are the tutorial and assignment that all the problems are solved through individual interactive work with a personal computer. Immediate feedback on errors is provided and the grading is done mostly by the computer. The time frame of problems solving can be set so that most students are able to redo the whole problems or selected one using different sets of the data to achieve mastery level. In courses where computer based problems solving was used, a definite improvement in the problem-solving skills of all the students was observed, while the effort for study very hard and grading was actually reduced. To change conventional learning method, some objectives are needed as a step for develop the interactive program, such as considering related platform for e-learning process, developing databases for thermodynamics property tables, deriving several properties of pure substances based thermodynamics equations, and developing interactive interface for self-help tutorial, on-line quizzes.
Applied Mechanics and Materials, 2014
Hydropower is one of the most widely source to produce electricity for domestic houses as well as... more Hydropower is one of the most widely source to produce electricity for domestic houses as well as for industries around the world. However, for those off-grid settlements the pico-hydro scheme is more suitable due to its cost-effectiveness (less maintenance), clean, user-friendly and do not involved with huge construction works. Even the installation of this type of hydropower scheme is very simple as do it yourself (DIY) concept. One of the most popular pico-hydro turbines which have been implemented widely in rural areas until nowadays is propeller type or also known as axial turbine. Propeller turbine is selected because it is suitable to operate under low head with high flow rate condition. However, in this particular case, low head with low flow rate of water are the two main parameters which need to be considered. This is because during dry or drought season the water level of the rivers will become low and fluctuated, and this scenario affected the performance of the propelle...
Off-grid settlements require cheap, efficient, reliable and cost-effective alternative energy to ... more Off-grid settlements require cheap, efficient, reliable and cost-effective alternative energy to the power dominantly supplied by diesel generator. However, most initial capital cost of renewable energy system, especially single source energy, is often considered very costly. Techno-economic analysis is important in the feasibility studies of the renewable energy system in the long run. This paper reviews the application of genetic
European journal of Social …, 2009
European journal of Social …, 2009
Abstract: The development of new and sustainable energy sources has become exciting challenges fa... more Abstract: The development of new and sustainable energy sources has become exciting challenges facing researchers, scientists and/or policy makers involved in developing renewable energy technologies, especially for rural area. This paper highlights an initial study of a potential for economic and social aspects development of micro-hydro system for rural electrification in Malaysia. In this paper, the potential of economic and social aspects are presented in three development issues: human and education, agricultural and ...
Malaysia is currently constructing a large hydropower station with five more schemes under review... more Malaysia is currently constructing a large hydropower station with five more schemes under review. However these stations are catering for energy consuming industrial parks while the domestic supply is not making much in-road due to geographical constraints. This paper is discussing the use of offgrid alternative for power supply to the rural settlements. A run-of-river application, pico hydro, requires no dam or reservoir for water storage. It is intended for low flow and low head application. A mapping of possible ...
Proc. of 3rd WSEAS International Conference on Energy Planning, Energy Saving, Environmental Education, 3rd WSEAS RES, 2009
Abstract:-Running the generator and use of battery to light up the house are common to rural folk... more Abstract:-Running the generator and use of battery to light up the house are common to rural folks. The difficulty of getting the fuel and the cost of fuel are the main problems. Use of other alternative renewable energy such as solar photovoltaic modules, which is available for a number of hours per day, is very costly. It is required to find suitable option to provide cheap and reliable option. While large hydropower provides electrical power for industry and domestic use, small-scale hydro is making some contributions toward providing this basic ...
European Journal of Scientific Research, 2009
ABSTRACT. Hybrid energy systems are pollution free, takes low cost and less gestation period, use... more ABSTRACT. Hybrid energy systems are pollution free, takes low cost and less gestation period, user and social friendly. Such systems are important sources of energy for shops, schools, and clinics in village communities especially in remote areas. Hybrid systems can provide electricity at a comparatively economic price in many remote areas. This paper presents a method to jointly determine the sizing and operation control of hybrid energy systems. The model, PV wind hydro and biomass hybrid system connects to grid. The system configuration of the hybrid is derived based on a theoretical domestic load at a typical location and local solar radiation, wind and water flow rate data and biomass availability. The hybrid energy system is proposed for 10 of teacher’s houses of Industrial Training Institute, Mersing. It is predicted 10 kW load consumption per house. The hybrid energy system consists of wind, solar, biomass, hydro, and grid power. Approximately energy consumption is 860 kWh/d...
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Papers by Juhari Ab Razak