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Articles by Ishak Aris
Total Records ( 4 ) for Ishak Aris
  Faisal Mohammed Seif Al-Shamiry , Desa Ahmad , Abdul Rashid Mohamed Sharif , Ishak Aris , Rimfiel Janius and Rezuwan Kamaruddin
  Renewable energy sources like photovoltaic (PV) panels are used today in many applications. Natural ventilation in tropical greenhouse is common method for ventilation, which gives higher inside temperatures compared to the outside temperatures. In addition, this type of ventilation is not enough to reduce high temperature inside the structure in low land areas. Thus the requirement of cooling is increased. Use of the fossil fuel to run the cooling fans are not economically viable due to increasing of fuel cost and greenhouses are not always located near the electrical grid. This research presents a study on the installation and test of a complete photovoltaic hybrid system for cooling a tropical greenhouse. A hybrid photovoltaic system consisting of two photovoltaic sub-systems were connected to each other. This system includes 48 photovoltaic solar Panels with 18.75 watt each, one inverter, 1 charge controller and a battery bank (including 12 batteries). The PV system is located at University Putra Malaysia (UPM) Research Park. The national electricity grid was used as a backup unit. The load consisted of two misting fans for cooling greenhouse (during test period time) with 400 Watt electric power and five hours (11:00 am to 16:00 pm) daily operation. The results obtained showed that the maximum current drawn from the array was found to be 14.9 ampere at 13:00 pm (with load). The voltage of array was found to be 26.9 volt while the voltage and current of battery bank were found to be 26.2 volt and 23.0 ampere respectively. In conclusion, this study highlights the primary study of PV hybrid energy systems for tropical greenhouse cooling as an application of renewable energy in Selangor, Malaysia. The results showed that PV system would be suitable to supply electricity to cover the loads requirement demands without using energy from the grid
  A.K.M. Parvez Iqbal , Ishak Aris and M. Norhisam
  In order to overcome difficulties of using pneumatic system operated automatic spray gun, a tubular permanent magnet linear motor has been designed and developed to trigger the spray gun. Finite Element Method (FEM) is implemented in motor designing process to obtain the proper size of back yoke, coil and permanent magnet, type of materials of back yoke and PM, pitch length and the required thrust of the linear motor. Magnetic flux distribution can also be predicted from FEM analysis. Then several permeance thrust models are developed to optimize the size of the motor by analyzing the effect of thrust constant, electrical and mechanical time constant. Finally based on the optimized data the linear motor has been fabricated and tested with newly developed spray gun. During the performance test it is seen that the developed linear motor can be successfully implemented to trigger the spray gun.
  A.K.M. Parvez Iqbal , Ishak Aris , M.M. Rahman and Norhisam Misron
  In order to reduce the labor and production cost, linear motor operated automatic spray gun has been designed and developed. This spray gun consists of 2 spray units, spray unit holder and shaft assembly an air control and supply unit and a triggering unit to carry out the multiple spray operations. This study focuses on the design optimization and fabrication of the spray unit holder and shaft assembly. There are 2 links to this holder and they are 90° apart from each other. One end of the holder links are used to hold the spray units and the other ends are attached with a shaft. The shaft is kept in position in the spray gun body by the adjusting lever and can rotate 90° to either side. Due to this rotation, the position of spray units can be adjusted during the desired spray operation. Since, the highly pressurized fluid is passed through the spray unit, a high force is subjected to the end of the holder where the spray unit is held and the holder behaves like a cantilever beam. Meanwhile, the shaft is subjected to the bending moment and the torque due to the fluid pressure and the weight of the spray unit, respectively. After analyzing, dimensions and material selection have been optimized in order to fabricate the spray unit holder and shaft assembly. During the performance test, it is observed that the fabricated spray unit holder and shaft assembly can support the spray operation without any deflection and failure.
  A.K.M. ParvezIqbal , F.A.M Mokhtar , K.S.M. Sahari and Ishak Aris
  Utilizing Halbach magnet array, magnetic flux can be built up on the strong side of the array while the flux cancelled on the other weak side. Inherently, rotor of rotary motor has infinite rotational length with respect to its rotation while mover of the linear motor has finite length with respect to mover’s translation. This study starts with a brief introduction of Halbach array and its method in designing linear motors. It then discusses the difference between conventional permanent magnet array with Halbach array and also the difference between slotted type and slotless Halbach array. This study has reviewed the implementation of Halbach array in machines with different topologies and the Halabch magnetization field distribution.
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